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Texas Electrician Exams

Texas Journeyman Electrician Practice Test

Engineer Tsai
  • 1,002 Texas Journeyman practice questions
  • 10 full timed two-part mocks in the PSI format
  • Step-by-step solutions for every calculation question
  • Open-book lookup paths to the 2026 NEC location
  • Written to the 2026 NEC
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20 free Texas Journeyman practice questions with answers

Pick your answer, then open it to see the explanation and the 2026 NEC section.

  1. Definitions, Theory, and Plans

    A building owner wants the main disconnect for a small shop placed where an electrician can reach it. Under the NEC definition, which description matches equipment that is readily accessible?

    1. It can be reached quickly for operation or inspection without climbing over or removing obstacles, using tools other than keys, or using a portable ladder
    2. It admits close approach because it is not guarded by locked doors, elevation or other effective means
    3. It is visible from the equipment it controls and not more than 50 ft away
    4. Its operating handle is no higher than 6 ft 7 in above the floor
    Show answer

    Answer: 1. It can be reached quickly for operation or inspection without climbing over or removing obstacles, using tools other than keys, or using a portable ladder

    Readily accessible is the stricter of the access definitions: ready access must not depend on climbing, moving obstacles, tools (other than keys) or portable ladders. Option 2 is the old pre-2020 wording of plain 'accessible (as applied to equipment)', which today only means the equipment can be reached for operation, renewal and inspection; option 3 is 'in sight from', and option 4 is a height limit for switch and overcurrent device handles, not a definition.

    Reference: NEC Article 100 (Accessible, Readily) (NEC 2026)

  2. Electrical Services, Service Equipment, and Separately Derived Systems

    Overhead service-drop conductors of a 120/240-volt, single-phase system pass over the paved driveway of a one-family dwelling. The driveway carries only passenger cars. What is the minimum vertical clearance of the conductors above the driveway?

    1. 10 ft
    2. 12 ft
    3. 15 ft
    4. 18 ft
    Show answer

    Answer: 2. 12 ft

    For systems not over 300 volts to ground, 12 ft applies over residential property and driveways. 10 ft is limited to areas accessible to pedestrians only at not over 150 volts to ground, 15 ft applies where the voltage exceeds 300 volts to ground, and 18 ft applies over public streets, alleys and areas subject to truck traffic.

    Reference: NEC 230.24(B) (NEC 2026)

  3. Electrical Services, Service Equipment, and Separately Derived Systems

    A dwelling has a metal underground water pipe that is in direct contact with the earth for 25 ft, and it is used as a grounding electrode. What else does the NEC require for this grounding electrode system?

    1. Nothing further, because 25 ft of earth contact exceeds the 10 ft minimum
    2. The water pipe must be supplemented by an additional electrode of a type recognized by the Code
    3. The water pipe must be replaced by a concrete-encased electrode
    4. A dielectric union must be installed where the pipe enters the building
    Show answer

    Answer: 2. The water pipe must be supplemented by an additional electrode of a type recognized by the Code

    A metal underground water pipe can serve as an electrode, but the Code always requires it to be supplemented by another recognized electrode (for example a rod or a concrete-encased electrode), because the piping may later be replaced with plastic. A dielectric union would interrupt the electrode path.

    Reference: NEC 250.53(D)(2) (NEC 2026)

  4. Electrical Services, Service Equipment, and Separately Derived Systems

    A small strip center is supplied by one service. The designer wants to use separate enclosures, each containing its own service disconnect, grouped at one location. Under the general rule, what is the maximum number of service disconnects permitted for that service?

    1. 2
    2. 4
    3. 6
    4. 8
    Show answer

    Answer: 3. 6

    The general rule allows not more than six service disconnects for each service, grouped at one location. More than six requires a single main disconnect ahead of them.

    Reference: NEC 230.71(B) (NEC 2026)

  5. Electrical Feeders

    A feeder disconnect rated 1,200 amperes is installed on a solidly grounded 480Y/277-volt system. There is no ground-fault protection of equipment on the supply side of this feeder, and the feeder does not serve a continuous industrial process or a fire pump. What does the NEC generally require at this feeder disconnect?

    1. Ground-fault protection of equipment
    2. A GFCI device for personnel protection
    3. An arc-fault circuit interrupter
    4. No additional protection, because only service disconnects need ground-fault protection
    Show answer

    Answer: 1. Ground-fault protection of equipment

    Feeder disconnects rated 1,000 amperes or more on solidly grounded wye systems of more than 150 volts to ground need ground-fault protection of equipment unless it is already provided on the supply side or an exception applies; a 480Y/277-volt system (277 volts to ground) is inside the covered voltage range. GFCI and AFCI devices protect people and branch circuits, not large feeders.

    Reference: NEC 215.10; NEC 230.95 (NEC 2026)

  6. Electrical Feeders

    A commercial building has both 208Y/120-volt and 480Y/277-volt feeders. How must the ungrounded feeder conductors be identified?

    1. No identification is required if the conductors are in separate raceways
    2. By phase or line and by system at every termination, connection and splice point, with the identification method documented in a readily available form or posted at each feeder panelboard
    3. Only by labeling the voltage on the outside of each raceway every 10 ft
    4. By using black insulation for all 480-volt conductors and red for all 208-volt conductors
    Show answer

    Answer: 2. By phase or line and by system at every termination, connection and splice point, with the identification method documented in a readily available form or posted at each feeder panelboard

    Where more than one nominal voltage system exists, feeder ungrounded conductors are identified by phase or line and by system at all termination, connection and splice points. The Code does not fix a color scheme; the chosen method must be documented where it is readily available or posted at each feeder panelboard.

    Reference: NEC 215.12(C)(2)(a)-(b) (NEC 2026)

  7. Branch Circuits and Conductors

    For a new one-family dwelling built at grade level, what is the minimum outdoor receptacle outlet requirement?

    1. One receptacle outlet anywhere on the exterior
    2. At least one receptacle outlet at the front and one at the back, each readily accessible from grade and not more than 6 1/2 ft above grade
    3. One receptacle outlet on each exterior wall, at any height
    4. Outdoor receptacle outlets are required only where a deck or porch is built
    Show answer

    Answer: 2. At least one receptacle outlet at the front and one at the back, each readily accessible from grade and not more than 6 1/2 ft above grade

    A one-family dwelling at grade needs at least one outdoor receptacle outlet at the front and at the back, readily accessible from grade and not more than 6 1/2 ft above grade. Decks and balconies carry their own separate requirement.

    Reference: NEC 210.52(E)(1) (NEC 2026)

  8. Branch Circuits and Conductors

    A 20-ampere, 120-volt branch circuit supplies several receptacle outlets in an office. What is the maximum rating of any single piece of cord-and-plug-connected utilization equipment, not fastened in place, that this circuit may supply?

    1. 10 A
    2. 12 A
    3. 16 A
    4. 20 A
    Show answer

    Answer: 3. 16 A

    On a 15- or 20-ampere branch circuit supplying two or more outlets, one cord-and-plug-connected piece of equipment not fastened in place may not exceed 80% of the branch-circuit rating: 0.80 x 20 A = 16 A.

    Reference: NEC 210.23(B)(1) (NEC 2026)

  9. Branch Circuits and Conductors

    In a dwelling unit bathroom with a single basin, where must at least one receptacle outlet be installed?

    1. Within 3 ft of the outside edge of the basin
    2. Within 6 ft of the bathtub
    3. Anywhere in the bathroom, including inside the vanity cabinet
    4. On the ceiling, for use by a hair dryer hanger
    Show answer

    Answer: 1. Within 3 ft of the outside edge of the basin

    At least one receptacle outlet must be within 3 ft of the outside edge of each basin, on a wall or partition adjacent to it, on the basin countertop, or on the side or face of the basin cabinet within the permitted distance below the countertop.

    Reference: NEC 210.52(D) (NEC 2026)

  10. Electrical Wiring Methods and Electrical Materials

    A 35-lb ceiling-suspended paddle fan will be supported only by the outlet box above it. What does the NEC require of that box?

    1. Any metal octagon box may be used if it is 2 1/8 in deep
    2. The box must be listed and marked by the manufacturer as suitable for fan support, and the fan may not exceed the listed weight (70 lb maximum)
    3. A plastic box may be used if it is nailed to a joist
    4. Only a box with an internal volume of at least 30 cubic inches may be used
    Show answer

    Answer: 2. The box must be listed and marked by the manufacturer as suitable for fan support, and the fan may not exceed the listed weight (70 lb maximum)

    A box used as the sole support of a ceiling-suspended fan must be listed and marked as suitable for that purpose, and may not support a fan weighing more than 70 lb (a box for a fan over 35 lb must also be marked with the weight it supports). Depth and volume alone do not qualify a box.

    Reference: NEC 314.27(C) (NEC 2026)

  11. Electrical Wiring Methods and Electrical Materials

    A run of rigid metal conduit is installed exposed along a warehouse wall with standard couplings. Apart from the securing requirement near boxes, at what maximum interval must it be supported under the general rule?

    1. 4 1/2 ft
    2. 8 ft
    3. 10 ft
    4. 14 ft
    Show answer

    Answer: 3. 10 ft

    Rigid metal conduit is generally supported at intervals not exceeding 10 ft, and securely fastened within 3 ft of each outlet box, junction box, cabinet or conduit termination. Longer spans are permitted only under the specific conditions the article lists.

    Reference: NEC 344.30(A) and (B) (NEC 2026)

  12. Electrical Wiring Methods and Electrical Materials

    Which of the following is a use of flexible cord that the NEC does not permit?

    1. Pendants
    2. Connection of portable appliances
    3. A substitute for the fixed wiring of a structure
    4. Wiring of luminaires
    Show answer

    Answer: 3. A substitute for the fixed wiring of a structure

    Flexible cord may not be used as a substitute for the fixed wiring of a structure. Pendants, portable appliance connections and luminaire wiring are all among the permitted uses.

    Reference: NEC 400.12 (NEC 2026)

  13. Electrical Equipment and Devices

    A 7-ft-tall 480-volt switchboard is installed in an electrical room. What is the minimum height of the working space in front of it?

    1. 6 ft
    2. 6 1/2 ft
    3. 7 ft (the height of the equipment)
    4. 8 ft
    Show answer

    Answer: 3. 7 ft (the height of the equipment)

    The working space must be clear from the floor to a height of 6 1/2 ft or the height of the equipment, whichever is greater. Here the switchboard is 7 ft tall, so 7 ft governs.

    Reference: NEC 110.26(A)(3) (NEC 2026)

  14. Electrical Equipment and Devices

    A new wall switch in a dwelling bedroom controls the ceiling luminaire, which is supplied by a grounded general-purpose branch circuit. The cable enters the switch box through a finished wall and is not in a raceway, and the lighting is not controlled by any automatic means. What does the NEC generally require at the switch location?

    1. A grounded (neutral) conductor for the circuit
    2. A GFCI device
    3. A second equipment grounding conductor
    4. A locking means for the switch
    Show answer

    Answer: 1. A grounded (neutral) conductor for the circuit

    Where switches control lighting loads supplied by a grounded general-purpose branch circuit, the grounded conductor must generally be provided at the switch location. The exceptions (for example a raceway or an accessible framing cavity that allows it to be added later, or a switch that does not serve a habitable room or bathroom) do not apply to this bedroom. The rule supports electronic switches such as occupancy sensors and timers.

    Reference: NEC 404.2(C) (NEC 2026)

  15. Electrical Equipment and Devices

    In a bathroom, which of these installations is not permitted?

    1. A cord-suspended pendant luminaire hanging 2 ft horizontally from the bathtub rim and 6 ft above it
    2. A recessed luminaire in the ceiling 9 ft above the bathtub rim
    3. A wall-mounted luminaire 5 ft horizontally from the bathtub rim
    4. A luminaire over the vanity basin, away from the tub and shower
    Show answer

    Answer: 1. A cord-suspended pendant luminaire hanging 2 ft horizontally from the bathtub rim and 6 ft above it

    Cord-connected, chain-, cable- or cord-suspended luminaires, pendants, lighting track and ceiling-suspended fans may not be located within the zone 3 ft horizontally and 8 ft vertically from the top of the bathtub rim or shower threshold. The pendant in option 1 is inside that zone; the others are outside it.

    Reference: NEC 410.10(D) (NEC 2026)

  16. Motors and Generators

    A motor disconnect is required to be in sight from the motor. What does 'in sight from' mean under the NEC?

    1. The disconnect is in the same room, at any distance
    2. The disconnect is visible from the motor and not more than 50 ft away
    3. The disconnect is within 25 ft, even if a wall blocks the view
    4. The disconnect can be seen on a camera monitor at the motor
    Show answer

    Answer: 2. The disconnect is visible from the motor and not more than 50 ft away

    'In sight from' means that one piece of equipment is visible from the other and not more than 50 ft distant. Distance alone, or a camera image, does not satisfy it.

    Reference: NEC 110.29 (NEC 2026)

  17. Motors and Generators

    A new 7.5 kW portable generator has 125-volt, 20-ampere receptacle outlets. What protection does the NEC require for these receptacles?

    1. None, because the generator frame is bonded to the neutral
    2. Listed GFCI protection, integral to the generator or to the receptacle
    3. AFCI protection only
    4. A surge protective device
    Show answer

    Answer: 2. Listed GFCI protection, integral to the generator or to the receptacle

    Portable generators rated 15 kW or smaller must provide listed GFCI protection for their 125-volt, single-phase, 15- and 20-ampere receptacle outlets (the Code also covers 125/250-volt outlets), either built into the generator or into the receptacle.

    Reference: NEC 445.20 (NEC 2026)

  18. Electrical Control Devices and Disconnecting Means

    A three-phase motor disconnect is being selected. Which design meets the NEC operating requirements for a motor disconnecting means?

    1. It opens all ungrounded supply conductors at once, and no pole can be operated independently
    2. It opens one ungrounded conductor, since that stops the motor
    3. It uses three single-pole switches, one for each phase
    4. It opens only the grounded conductor
    Show answer

    Answer: 1. It opens all ungrounded supply conductors at once, and no pole can be operated independently

    The motor disconnecting means must open all ungrounded supply conductors and be designed so that no pole can be operated independently. Opening one phase can single-phase the motor and leaves parts energized.

    Reference: NEC 430.103 (NEC 2026)

  19. Special Occupancies, Equipment, and Conditions

    At a solvent dip tank, ignitable concentrations of flammable vapors can exist under normal operating conditions. How is this location classified?

    1. Class I, Division 1
    2. Class I, Division 2
    3. Class II, Division 1
    4. Class III, Division 2
    Show answer

    Answer: 1. Class I, Division 1

    Class I covers flammable gases and vapors. Division 1 applies where ignitable concentrations can exist under normal operating conditions; Division 2 is for abnormal conditions only. Class II is combustible dust and Class III is ignitable fibers.

    Reference: NEC 500.5(B)(1) (NEC 2026)

  20. Renewable Energy Technologies

    Where must the PV system disconnecting means for a rooftop solar system on a house be installed?

    1. At a readily accessible location
    2. On the roof, next to the modules only
    3. Inside the attic, near the inverter
    4. Anywhere, if a label identifies it
    Show answer

    Answer: 1. At a readily accessible location

    The PV system disconnecting means must be installed at a readily accessible location so it can be operated without ladders or removing obstacles. Labels are required too, but they do not replace the location rule.

    Reference: NEC 690.13 and 705.20 (2026 harmonized disconnect rules) (NEC 2026)

Built by Engineer Tsai, holder of Taiwan's national Class B Indoor Wiring Technician certificate and site engineer on award-winning public projects, who teaches career switchers on YouTube (@tsai.electro). How we check questions · Refund policy · About Engineer Tsai

How we check questions
  • Every question is original, written to the 2026 NEC for the Texas PSI two-part format, and checked in a separate review pass before it goes live.
  • Every answer that relies on the code names its NEC article and section, with an open-book lookup path, so you can confirm it in your own code book.
  • An outside reviewer verifies the set against the printed 2026 NEC in rounds. When a check finds a problem, the question is fixed or withdrawn, and the change is listed below with its date.
  • Every question names its source (the 2026 NEC section wherever one applies), is checked in a separate review pass, and every correction is published with its date.
  • Public correction log
  • Spot an error? Report it from the question. Reports are reviewed within 7 days.
Corrections log

The Texas Journeyman practice set has been on this site since 2026-09-30. It grew from 85 questions at launch to 1,002 questions with 10 full two-part mocks.

  • Question O53009: code reference changed from NEC Article 90 (Code arrangement) to NEC 90.3. The correct answer changed, but it is still option 1. Reason: the 2026 NEC places the chapter arrangement rule in 90.3.
  • Question O53009: question text revised. The correct answer changed, but it is still option 1. Reason: stem now specifies the 2026 arrangement of the Code.
  • Question O53009: answer options revised. The correct answer changed, but it is still option 1. Reason: the keyed option now states the 2026 rule and the older wording is kept only as a distractor.
  • Question O53009: explanation revised. The correct answer changed, but it is still option 1. Reason: explanation now follows the 2026 rule that Chapters 5 through 8 supplement or modify Chapters 1 through 4.
  • Question O53009: open-book lookup path updated. The correct answer changed, but it is still option 1. Reason: lookup path now points to 90.3 instead of the whole article.
  • Question O51270: code reference changed from NEC Article 100 (PV Output Circuit) to NEC Article 100 (PV dc Circuit, Source). The correct answer changed, but it is still option 2. Reason: the 2026 NEC has no PV Output Circuit definition, so the citation now names the PV dc Circuit, Source definition.
  • Question O51270: question text revised. The correct answer changed, but it is still option 2. Reason: stem now asks for the 2026 term for dc conductors from a dc combiner to the inverter.
  • Question O51270: answer options revised. The correct answer changed, but it is still option 2. Reason: the keyed option is now PV source circuit and the removed term PV output circuit is kept only as a distractor.
  • Question O51270: explanation revised. The correct answer changed, but it is still option 2. Reason: explanation now follows the 2026 PV dc circuit definitions.
  • Question O51270: open-book lookup path updated. The correct answer changed, but it is still option 2. Reason: lookup path now points to the 2026 PV dc Circuit, Source definition.
  • Question O56011: code reference changed from NEC 110.16 (permanent label on service equipment rated 1,200 amperes or more) to NEC 110.16. The correct answer changed, but it is still option 4. Reason: citation no longer refers to a 1,200-ampere service label, which the 2026 110.16 does not have.
  • Question O56011: question text revised. The correct answer changed, but it is still option 4. Reason: stem no longer depends on the 1,200-ampere label and industry-practice alternative that the 2026 NEC removed.
  • Question O56011: answer options revised. The correct answer changed, but it is still option 4. Reason: the keyed option now lists the 2026 label content and the older 1,200-ampere label content is kept only as a distractor.
  • Question O56011: explanation revised. The correct answer changed, but it is still option 4. Reason: explanation now follows the 2026 110.16 marking content.
  • Question O52118: code reference changed from NEC 314.16(B) to NEC 314.16(B)(1), (B)(4) and (B)(5). The answer changed from option 3 to option 2. Reason: citation now names the 2026 grounding-conductor allowance rule in 314.16(B)(5) that decides this answer.
  • Question O52118: question text revised. The answer changed from option 3 to option 2. Reason: stem now calls the four conductors circuit conductors and states the 2026 rule that up to four equipment grounding conductors, isolated or not, share one allowance.
  • Question O52118: answer key changed. The answer changed from option 3 to option 2. Reason: under the 2026 rule the two grounding conductors count once, so the minimum volume is 15.75 cubic inches.
  • Question O52118: explanation revised. The answer changed from option 3 to option 2. Reason: explanation now counts both grounding conductors as one allowance and explains the old extra-allowance error.
  • Question O52118: worked solution revised. The answer changed from option 3 to option 2. Reason: worked solution now uses seven allowances and records 18.00 as the old isolated-allowance error.
  • Question O56008: code reference changed from NEC Article 406 (dimmer-controlled receptacles) to NEC 406.46(D). The correct answer changed, but it is still option 4. Reason: the 2026 Article 406 no longer has the dimmer-controlled receptacle rule, so the citation now points to the general-use dimmer rule in 406.46(D).
  • Question O56008: question text revised. The correct answer changed, but it is still option 4. Reason: stem now asks when a general-use dimmer may control receptacle-supplied lamps under the 2026 rule.
  • Question O56008: answer options revised. The correct answer changed, but it is still option 4. Reason: the keyed option now states the 2026 dimmer listing condition instead of the removed nonstandard plug and receptacle rule.
  • Question O56008: explanation revised. The correct answer changed, but it is still option 4. Reason: explanation now follows the 2026 406.46(D) rule for general-use dimmer switches.
  • Question O56008: open-book lookup path updated. The correct answer changed, but it is still option 4. Reason: lookup path now points to 406.46(D) instead of the whole article.
  • Question O56005: code reference changed from NEC Article 424 (color identification of heating cable nonheating leads) to NEC 424.35. The correct answer changed, but it is still option 2. Reason: the 2026 NEC no longer has the nonheating lead color code, so the citation now points to the 424.35 marking rule.
  • Question O56005: question text revised. The correct answer changed, but it is still option 2. Reason: stem now asks for the 2026 heating cable marking instead of the removed lead color code.
  • Question O56005: answer options revised. The correct answer changed, but it is still option 2. Reason: the keyed option now lists the 2026 marking content and the old lead color code is kept only as a distractor.
  • Question O56005: explanation revised. The correct answer changed, but it is still option 2. Reason: explanation now follows the 2026 424.35 marking content.
  • Question O56005: open-book lookup path updated. The correct answer changed, but it is still option 2. Reason: lookup path now points to 424.35 instead of the whole article.
  • Question O56013: code reference changed from NEC Article 100 (Within Sight) to NEC 110.29 (Article 100 definition in the 2023 NEC). The answer did not change. Reason: the 2026 NEC places the within-sight rule in 110.29 instead of an Article 100 definition.
  • Question O56013: worked solution revised. The answer did not change. Reason: worked solution now cites 110.29.
  • Question O56013: open-book lookup path updated. The answer did not change. Reason: lookup path now points to 110.29 instead of the Article 100 definition.
  • Question O50168: code reference changed from NEC 406.12 to NEC 406.26(1) (406.12 in the 2023 NEC). The answer did not change. Reason: tamper-resistant receptacle locations moved from 406.12 to 406.26 in the 2026 NEC.
  • Question O50168: open-book lookup path updated. The answer did not change. Reason: lookup path now points to 406.26, the 2026 location of the tamper-resistant rule.
  • Question O50242: code reference changed from NEC 406.5(E) to NEC 406.14(G)(1) (406.5 in the 2023 NEC). The answer did not change. Reason: the face-up countertop receptacle rule moved from 406.5 to 406.14(G)(1) in the 2026 NEC.
  • Question O50242: open-book lookup path updated. The answer did not change. Reason: lookup path now points to 406.14(G)(1), the 2026 location of the rule.
  • Question O51352: code reference changed from NEC Article 100 (Closet Storage Space) to NEC 410.16(A). The answer did not change. Reason: the 2026 NEC gives the closet storage space dimensions in 410.16(A); Article 100 only defines the term.
  • Question O51352: open-book lookup path updated. The answer did not change. Reason: lookup path now points to 410.16(A), where the 2026 dimensions are.
  • Question O50619: code reference changed from NEC 314.16(B) to NEC 314.16(B)(1), (B)(4) and (B)(5). The answer did not change. Reason: citation now names the 2026 conductor, device and grounding-conductor allowance rules.
  • Question O50619: question text revised. The answer did not change. Reason: stem now states that only two equipment grounding conductors enter, so the single allowance applies.
  • Question O50619: explanation revised. The answer did not change. Reason: explanation now says why the grounding conductors count as one allowance.
  • Question O50619: worked solution revised. The answer did not change. Reason: worked solution now records the number of grounding conductors and the 2026 citation.
  • Question O54047: code reference changed from NEC 314.16(B) to NEC 314.16(B)(1), (B)(4) and (B)(5). The answer did not change. Reason: citation now names the 2026 conductor, device and grounding-conductor allowance rules.
  • Question O54047: question text revised. The answer did not change. Reason: stem now states that no more than four equipment grounding conductors will enter the box, so they count as one allowance.
  • Question O54047: explanation revised. The answer did not change. Reason: explanation now says why the grounding conductors count as one allowance and correctly describes the 4-conductor distractor as also leaving out the grounding allowance.
  • Question O54047: worked solution revised. The answer did not change. Reason: worked solution now records the grounding conductor count, the 2026 citation and the corrected 4-conductor distractor description.
  • Question O54009: code reference changed from NEC Article 120 (electric vehicle supply equipment load in a service calculation) to NEC 120.57 (electric vehicle supply equipment load). The correct answer changed, but it is still option 2. Reason: citation now names 120.57, the 2026 rule for the EVSE load.
  • Question O54009: question text revised. The correct answer changed, but it is still option 2. Reason: stem now states the 2026 rule that EVSE counts at nameplate where available and 7,200 W only where no nameplate rating is available, and gives as a condition that no demand factor or multiplier applies.
  • Question O54009: answer options revised. The correct answer changed, but it is still option 2. Reason: options are rebuilt from the 2026 result of 164.0 A, and 170.0 A is kept as the older larger-of rule distractor.
  • Question O54009: explanation revised. The correct answer changed, but it is still option 2. Reason: explanation now uses the nameplate ratings and explains the older larger-of rule as an error.
  • Question O54009: worked solution revised. The correct answer changed, but it is still option 2. Reason: worked solution now counts each unit at its nameplate rating.
  • Question O54009: open-book lookup path updated. The correct answer changed, but it is still option 2. Reason: lookup path now points to 120.57 instead of the whole article.
  • Question O55007: code reference changed from NEC Article 120 (optional calculation for a one-family dwelling; 220.82 in the 2023 NEC) to NEC 120.82(B) and 120.82(C)(3) (220.82 in the 2023 NEC). The correct answer changed, but it is still option 2. Reason: citation now names 120.82(B) and 120.82(C)(3), the 2026 optional-method rules this item uses.
  • Question O55007: question text revised. The correct answer changed, but it is still option 2. Reason: stem now gives the 2026 first step of 8,000 VA at 100% instead of the 2023 first 10,000 VA.
  • Question O55007: answer options revised. The correct answer changed, but it is still option 2. Reason: options are recomputed from the 2026 first step of 8,000 VA, keeping the same three error types.
  • Question O55007: explanation revised. The correct answer changed, but it is still option 2. Reason: explanation now works the calculation with the 2026 first step of 8,000 VA.
  • Question O55007: worked solution revised. The correct answer changed, but it is still option 2. Reason: worked solution now uses the 2026 first step of 8,000 VA.
  • Question O55007: open-book lookup path updated. The correct answer changed, but it is still option 2. Reason: lookup path now points to 120.82(B) and 120.82(C)(3) instead of the whole article.
  • Question O55008: code reference changed from NEC Article 120 (optional calculation for an existing dwelling unit; 220.83 in the 2023 NEC) to NEC 120.83 and Table 120.83 (220.83 in the 2023 NEC). The correct answer changed, but it is still option 4. Reason: citation now names 120.83 and Table 120.83, the 2026 method for an existing dwelling.
  • Question O55008: question text revised. The correct answer changed, but it is still option 4. Reason: stem now gives the Table 120.83 percentages and says the first 8,000 VA comes from the existing load.
  • Question O55008: answer options revised. The correct answer changed, but it is still option 4. Reason: options are recomputed with the new air conditioner at 50% under Table 120.83, keeping the same three error types.
  • Question O55008: explanation revised. The correct answer changed, but it is still option 4. Reason: explanation now applies Table 120.83, with the new air conditioner at 50%.
  • Question O55008: worked solution revised. The correct answer changed, but it is still option 4. Reason: worked solution now applies the Table 120.83 percentages.
  • Question O55008: open-book lookup path updated. The correct answer changed, but it is still option 4. Reason: lookup path now points to 120.83 and Table 120.83 instead of the whole article.
  • Question O55059: code reference changed from NEC Article 120 (optional calculation for a one-family dwelling; 220.82 in the 2023 NEC) to NEC 120.82(B) and 120.82(C)(4) (220.82 in the 2023 NEC). The correct answer changed, but it is still option 4. Reason: citation now names 120.82(B) and 120.82(C)(4), the 2026 optional-method rules this item uses.
  • Question O55059: question text revised. The correct answer changed, but it is still option 4. Reason: stem now gives the 2026 first step of 8,000 VA at 100% instead of the 2023 first 10,000 VA.
  • Question O55059: answer options revised. The correct answer changed, but it is still option 4. Reason: options are recomputed from the 2026 first step of 8,000 VA, keeping the same three error types.
  • Question O55059: explanation revised. The correct answer changed, but it is still option 4. Reason: explanation now works the calculation with the 2026 first step of 8,000 VA.
  • Question O55059: worked solution revised. The correct answer changed, but it is still option 4. Reason: worked solution now uses the 2026 first step of 8,000 VA.
  • Question O55059: open-book lookup path updated. The correct answer changed, but it is still option 4. Reason: lookup path now points to 120.82(B) and 120.82(C)(4) instead of the whole article.
  • Question O52039: code reference changed from NEC Article 120 (optional calculation for a one-family dwelling) to NEC 120.82(B) and 120.82(C)(1) (220.82 in the 2023 NEC). The correct answer changed, but it is still option 4. Reason: citation now names 120.82(B) and 120.82(C)(1), the 2026 optional-method rules this item uses.
  • Question O52039: question text revised. The correct answer changed, but it is still option 4. Reason: stem now gives the 2026 first step of 8,000 VA at 100% instead of the 2023 first 10,000 VA.
  • Question O52039: answer options revised. The correct answer changed, but it is still option 4. Reason: options are recomputed from the 2026 first step of 8,000 VA, keeping the same three error types.
  • Question O52039: explanation revised. The correct answer changed, but it is still option 4. Reason: explanation now works the calculation with the 2026 first step of 8,000 VA.
  • Question O52039: worked solution revised. The correct answer changed, but it is still option 4. Reason: worked solution now uses the 2026 first step of 8,000 VA.
  • Question O52039: open-book lookup path updated. The correct answer changed, but it is still option 4. Reason: lookup path now points to 120.82(B) and 120.82(C)(1) instead of the whole article.
  • Question O55071: code reference changed from NEC Article 120 (optional calculation for an existing dwelling unit; 220.83 in the 2023 NEC) to NEC 120.83 and Table 120.83 (220.83 in the 2023 NEC). The correct answer changed, but it is still option 1. Reason: citation now names 120.83 and Table 120.83, the 2026 method for an existing dwelling.
  • Question O55071: question text revised. The correct answer changed, but it is still option 1. Reason: stem now gives the Table 120.83 percentages, including 80% for new EVSE, and says the first 8,000 VA comes from the existing load.
  • Question O55071: answer options revised. The correct answer changed, but it is still option 1. Reason: options are recomputed with the new EVSE at 80% under Table 120.83, keeping the original error types.
  • Question O55071: explanation revised. The correct answer changed, but it is still option 1. Reason: explanation now applies Table 120.83, with the new EVSE at 80%.
  • Question O55071: worked solution revised. The correct answer changed, but it is still option 1. Reason: worked solution now applies the Table 120.83 percentages.
  • Question O55071: open-book lookup path updated. The correct answer changed, but it is still option 1. Reason: lookup path now points to 120.83 and Table 120.83 instead of the whole article.
  • Question O56004: answer options revised. The correct answer changed, but it is still option 2. Reason: the keyed option now states the 2026 permission for a cord identified as suitable in the manufacturer's installation instructions.
  • Question O56004: explanation revised. The correct answer changed, but it is still option 2. Reason: explanation now follows the 2026 wording of 422.16(B)(3) and drops the servicing-only limit.
  • Question O56001: code reference changed from NEC Article 440 (equipment grounding conductor for rooftop equipment supplied through nonthreaded fittings) to NEC 440.9. The answer did not change. Reason: citation now names 440.9, the 2026 rooftop grounding rule.
  • Question O56001: question text revised. The answer did not change. Reason: stem now specifies compression-type fittings, the 2026 trigger, instead of set-screw fittings and the multimotor qualifier.
  • Question O56001: explanation revised. The answer did not change. Reason: explanation now follows the 2026 compression-fitting trigger in 440.9.
  • Question O56001: open-book lookup path updated. The answer did not change. Reason: lookup path now points to 440.9 instead of the whole article.
  • Question O51224: code reference changed from NEC Article 517 (selectivity of ground-fault protection in hospitals) to NEC 517.17(C). The correct answer changed, but it is still option 4. Reason: citation now names 517.17(C), the 2026 selectivity rule.
  • Question O51224: question text revised. The correct answer changed, but it is still option 4. Reason: stem now asks what governs the separation instead of asking for a minimum time that the 2026 rule no longer sets.
  • Question O51224: answer options revised. The correct answer changed, but it is still option 4. Reason: the keyed option now states the 2026 selectivity requirement and the old six-cycle value is kept only as a distractor.
  • Question O51224: explanation revised. The correct answer changed, but it is still option 4. Reason: explanation now follows the 2026 selectivity requirement instead of a fixed six-cycle separation.
  • Question O51224: open-book lookup path updated. The correct answer changed, but it is still option 4. Reason: lookup path now points to 517.17(C) instead of the whole article.
  • Question O51212: code reference changed from NEC 230.70(A) to NEC 230.70(A)(2) and 230.70(A)(3). The answer did not change. Reason: citation now names 230.70(A)(2) for multifamily dwellings and 230.70(A)(3) for the bathroom prohibition.
  • Question O51212: question text revised. The answer did not change. Reason: stem now names a multifamily dwelling so the 2026 outdoor rule for one- and two-family dwellings does not apply.
  • Question O51212: answer options revised. The answer did not change. Reason: the garage option now says it is nearest the point of entrance so it is clearly a permitted location.
  • Question O51212: explanation revised. The answer did not change. Reason: explanation now separates the multifamily rule from the 2026 one- and two-family outdoor rule.
  • Question O51212: open-book lookup path updated. The answer did not change. Reason: lookup path now points to 230.70(A)(2) and 230.70(A)(3).
  • Question O51153: code reference changed from NEC Article 410 (installation of luminaires on fiberboard) to NEC 410.136(B). The answer did not change. Reason: citation now names 410.136(B), the 2026 fiberboard rule.
  • Question O51153: question text revised. The answer did not change. Reason: stem now says the luminaire contains an LED driver, which is what brings it under the 2026 fiberboard rule.
  • Question O51153: explanation revised. The answer did not change. Reason: explanation now states that the rule covers luminaires containing a ballast, transformer, LED driver or power supply.
  • Question O51153: open-book lookup path updated. The answer did not change. Reason: lookup path now points to 410.136(B) instead of the whole article.
  • Question O51245: code reference changed from NEC Article 410 (poles supporting luminaires) to NEC 410.30(B)(1). The answer did not change. Reason: citation now names 410.30(B)(1), the 2026 pole handhole rule.
  • Question O51245: question text revised. The answer did not change. Reason: stem now gives a 25-ft pole without a hinged base so the hinged-base exception cannot apply.
  • Question O51245: explanation revised. The answer did not change. Reason: explanation now says why the hinged-base exception does not apply to this pole.
  • Question O51245: open-book lookup path updated. The answer did not change. Reason: lookup path now points to 410.30(B)(1) instead of the whole article.
  • Question O50479: code reference changed from NEC Article 410 (grounding of luminaires) to NEC 410.42. The correct answer changed, but it is still option 4. Reason: citation now names 410.42, the 2026 rule for exposed conductive parts.
  • Question O50479: question text revised. The correct answer changed, but it is still option 4. Reason: stem now asks for the general rule so the narrow exceptions do not make another option correct.
  • Question O50479: answer options revised. The correct answer changed, but it is still option 4. Reason: the keyed option now drops the pre-2026 "or insulated from ground" alternative.
  • Question O50479: explanation revised. The correct answer changed, but it is still option 4. Reason: explanation now follows the 2026 rule and names its narrow exceptions.
  • Question O50479: open-book lookup path updated. The correct answer changed, but it is still option 4. Reason: lookup path now points to 410.42 instead of the whole article.
  • Question O51148: code reference changed from NEC Article 422 (appliance disconnecting means) to NEC 422.31(A). The answer did not change. Reason: citation now names 422.31(A), the 2026 rule for small permanently connected appliances.
  • Question O51148: question text revised. The answer did not change. Reason: stem now says the branch-circuit breaker is within sight from the appliance, the condition 422.31(A) requires.
  • Question O51148: explanation revised. The answer did not change. Reason: explanation now includes the within-sight or lockable condition.
  • Question O51148: open-book lookup path updated. The answer did not change. Reason: lookup path now points to 422.31(A) instead of the whole article.
  • Question O50482: code reference changed from NEC Article 422 (GFCI protection of appliances) to NEC 422.5(A)(3). The answer did not change. Reason: citation now names 422.5(A)(3), the 2026 GFCI rule for high-pressure spray washers.
  • Question O50482: answer options revised. The answer did not change. Reason: the keyed option now says the washer is cord-and-plug connected and 120 volts, matching 422.5(A)(3).
  • Question O50482: explanation revised. The answer did not change. Reason: explanation now states the cord-and-plug and voltage and current limits of the 2026 rule.
  • Question O50482: open-book lookup path updated. The answer did not change. Reason: lookup path now points to 422.5(A)(3) instead of the whole article.
  • Question O54083: code reference changed from NEC Article 630 (arc welders, overcurrent protection) to NEC 630.12(A). The answer did not change. Reason: citation now names 630.12(A), the 2026 welder overcurrent rule.
  • Question O54083: question text revised. The answer did not change. Reason: stem now says the nameplate does not give I1max, which is when 200% of the rated primary current applies.
  • Question O54083: explanation revised. The answer did not change. Reason: explanation now says why the rated primary current is used.
  • Question O54083: worked solution revised. The answer did not change. Reason: worked solution now records that I1max is not given.
  • Question O54083: open-book lookup path updated. The answer did not change. Reason: lookup path now points to 630.12(A) instead of the whole article.
  • Question O55041: code reference changed from NEC Article 695 (fire pump supply overcurrent device and conductor ampacity) to NEC 695.5(B)(2)(a)(1) and 695.7(B)(1). The answer did not change. Reason: citation now names 695.5(B)(2)(a)(1) and 695.7(B)(1), the 2026 device and conductor rules.
  • Question O55041: question text revised. The answer did not change. Reason: stem now gives the 2026 device rule of the largest fire pump locked-rotor current plus the other pump full-load current and accessories.
  • Question O55041: explanation revised. The answer did not change. Reason: explanation now computes the device sum as 370.4 A under the 2026 rule; the 400 A answer is unchanged.
  • Question O55041: worked solution revised. The answer did not change. Reason: worked solution now uses the 2026 device sum of 370.4 A.
  • Question O55041: open-book lookup path updated. The answer did not change. Reason: lookup path now points to 695.5(B)(2)(a)(1) and 695.7(B)(1) instead of the whole article.
  • Question O50625: code reference changed from NEC Article 440 (branch-circuit short-circuit and ground-fault protection) to NEC 440.22(A) and Exception No. 1. The answer changed from option 3 to option 2. Reason: citation now names 440.22(A) and its Exception No. 1, which sets the maximum.
  • Question O50625: question text revised. The answer changed from option 3 to option 2. Reason: stem now states the 2026 permission to go up to the next higher standard size instead of the next lower size.
  • Question O50625: answer key changed. The answer changed from option 3 to option 2. Reason: under 440.22(A) Exception No. 1 the maximum is the next higher standard size above 32.55 A, which is 35 A.
  • Question O50625: explanation revised. The answer changed from option 3 to option 2. Reason: explanation now rounds up to 35 A under Exception No. 1.
  • Question O50625: worked solution revised. The answer changed from option 3 to option 2. Reason: worked solution now rounds up to the next higher standard size, 35 A.
  • Question O50625: open-book lookup path updated. The answer changed from option 3 to option 2. Reason: lookup path now points to 440.22(A) instead of the whole article.
  • Question O55056: code reference changed from NEC 440.32, 310.15(B) and 310.16; Article 310 (temperature adder for raceways on rooftops) to NEC 440.35, 310.15(B)(2), Table 310.15(B)(1)(1), Table 310.16 and 110.14(C). The answer did not change. Reason: a marked minimum circuit ampacity falls under 440.35, not 440.32, and the rooftop adder is in 310.15(B)(2).
  • Question O55056: question text revised. The answer did not change. Reason: stem now gives the 2026 rooftop adder threshold of less than 3/4 inch instead of 7/8 inch; the raceway still lies on the roof.
  • Question O55056: worked solution revised. The answer did not change. Reason: worked solution now cites 440.35 and the 2026 rooftop adder location.
  • Question O55056: open-book lookup path updated. The answer did not change. Reason: lookup path now points to 440.35 and 310.15(B)(2) instead of 440.32 and 310.15(B).
  • Question O50448: code reference changed from NEC Article 210 (receptacle near electrical service equipment) to NEC 210.63(B). The answer did not change. Reason: citation now points to the specific 2026 NEC section instead of the general article.
  • Question O50448: question text revised. The answer did not change. Reason: stem now states the occupancy and system-voltage conditions the code requires.
  • Question O50448: explanation revised. The answer did not change. Reason: explanation now matches the conditions of the rule and drops an unverified claim about an older distance.
  • Question O56020: code reference changed from NEC 551.71(A) to NEC 551.71(A)(2), 551.71(A)(3) and 551.71(B). The answer did not change. Reason: citation now names the 2026 NEC new-site percentage, the overlap rule and the tent-site exclusion.
  • Question O56020: question text revised. The answer did not change. Reason: stem now states that no site is a dedicated tent site and that every 50-ampere site also has a 30-ampere receptacle.
  • Question O56020: explanation revised. The answer did not change. Reason: explanation now explains the overlap between the 50-ampere and 30-ampere site groups.
  • Question O56020: worked solution revised. The answer did not change. Reason: solution now gives the code reason the 70 percent applies to all 47 sites.
  • Question O56018: code reference changed from NEC 120.140(B)(2)-(4) (550.18(B) in the 2023 NEC) to NEC 120.140(A)(5) and 120.140(B)(1)-(4) (550.18 in the 2023 NEC). The answer did not change. Reason: citation now names every 2026 NEC subsection the calculation uses.
  • Question O50323: question text revised. The answer did not change. Reason: stem now states the per-lot basis the 2026 NEC uses, the larger of 16,000 VA or the largest home accepted.
  • Question O50323: explanation revised. The answer did not change. Reason: explanation now explains why 16,000 VA is the per-lot value and why each wrong option is wrong.
  • Question O50323: worked solution revised. The answer did not change. Reason: solution now cites the 2026 NEC location and the per-lot basis.
  • Question O55069: code reference changed from NEC Article 550 (mobile home park feeder and service demand) to NEC 120.141 and Table 120.141 (Article 550 in the 2023 NEC). The answer did not change. Reason: the park load calculation is in 120.141 in the 2026 NEC, not Article 550.
  • Question O53048: code reference changed from NEC Article 215 to NEC 215.1 and its Informational Note. The answer did not change. Reason: citation now points to the scope section that sets the voltage limit.
  • Question O53048: question text revised. The answer did not change. Reason: stem now states the voltage limit of the article's scope.
  • Question O53048: explanation revised. The answer did not change. Reason: explanation now states the voltage limit and where higher-voltage feeders are covered.
  • Question O50122: code reference changed from NEC 210.19 (branch-circuit conductors for continuous loads) to NEC 210.19(A)(1). The answer did not change. Reason: citation now points to the specific 2026 NEC subsection instead of the whole section.
  • Question O50122: question text revised. The answer did not change. Reason: stem now states the condition the code requires by ruling out the 100%-rated assembly and other exceptions.
  • Question O50122: explanation revised. The answer did not change. Reason: explanation now says why 16 A is wrong under the stated conditions.
  • Question O50122: worked solution revised. The answer did not change. Reason: solution now cites 210.19(A)(1) and the excluded exceptions.
  • Question O51083: code reference changed from NEC Article 210 (branch-circuit ratings) to NEC 210.18. The answer did not change. Reason: citation now points to the specific 2026 NEC section instead of the general article.
  • Question O51083: question text revised. The answer did not change. Reason: stem now limits the question to branch circuits other than individual branch circuits, which is what the standard-rating list covers.
  • Question O51083: explanation revised. The answer did not change. Reason: explanation now lists the 2026 standard ratings, including the restricted 10-ampere rating, and no longer claims that ratings above 50 amperes are permitted only for individual branch circuits.
  • Question O50438: code reference changed from NEC Article 210 (branch-circuit rating) to NEC 210.18. The answer did not change. Reason: citation now points to the specific 2026 NEC section instead of the general article.
  • Question O50439: code reference changed from NEC Article 210 (branch-circuit voltage limitations) to NEC 210.6(A). The answer did not change. Reason: citation now points to the specific 2026 NEC section instead of the general article.
  • Question O50439: question text revised. The answer did not change. Reason: stem now excludes the listed exceptions so the general limit is the only answer.
  • Question O50439: explanation revised. The answer did not change. Reason: explanation now notes the exceptions and why each wrong option is wrong.
  • Question O50436: code reference changed from NEC Article 210 (multiple branch circuits on the same yoke) to NEC 210.7. The answer did not change. Reason: citation now points to the specific 2026 NEC section instead of the general article.
  • Question O50449: code reference changed from NEC Article 210 (GFCI protection for specific appliances) to NEC 210.8(D)(7). The answer did not change. Reason: citation now points to the specific 2026 NEC section instead of the general article.
  • Question O50449: question text revised. The answer did not change. Reason: stem now matches the 2026 rule, which covers the branch circuit or outlet supplying the appliance.
  • Question O50449: explanation revised. The answer did not change. Reason: explanation now uses the same branch-circuit-or-outlet wording as the 2026 rule.
  • Question O50218: question text revised. The answer did not change. Reason: stem now excludes the motor and arc-welder exceptions so 20 amperes is the only minimum.
  • Question O50218: explanation revised. The answer did not change. Reason: explanation now names the two exceptions the stem excludes.
  • Question O51096: code reference changed from NEC 210.19 to NEC 210.19(C), Exception No. 2; Table 120.55, Column C. The answer did not change. Reason: citation now points to the 2026 neutral exception and the table column it depends on.
  • Question O51096: question text revised. The answer did not change. Reason: stem now states the 3-wire circuit, range rating and Column C demand conditions the neutral exception requires.
  • Question O51096: explanation revised. The answer did not change. Reason: explanation now ties the 70 percent neutral to the exception's conditions instead of teaching it as a blanket rule.
  • Question O51097: code reference changed from NEC 210.19 to NEC 210.19(C). The answer did not change. Reason: citation now points to the specific 2026 NEC subsection instead of the whole section.
  • Question O51097: explanation revised. The answer did not change. Reason: explanation now makes clear that 40 amperes is a minimum, not a size that is always enough.
  • Question O51226: code reference changed from NEC Article 210 (lampholders) to NEC 210.21(A). The answer did not change. Reason: citation now points to the specific 2026 NEC section instead of the general article.
  • Question O51226: explanation revised. The answer did not change. Reason: explanation now states the 20-ampere threshold and drops lampholder wattage figures that were not checked against the 2026 text.
  • Question O50616: code reference changed from NEC Article 210 (continuous loads on branch circuits) to NEC 210.20(A). The answer did not change. Reason: citation now points to the specific 2026 NEC section instead of the general article.
  • Question O50616: question text revised. The answer did not change. Reason: stem now rules out the 100%-rated assembly exception that would change the 80 percent limit.
  • Question O50616: explanation revised. The answer did not change. Reason: explanation now gives the reason for each wrong option.
  • Question O54034: code reference changed from NEC Article 210 (branch circuit loading for continuous loads) to NEC 210.20(A). The answer did not change. Reason: citation now points to the specific 2026 NEC section instead of the general article.
  • Question O50199: code reference changed from NEC Table 120.130(A) (Table 551.73(A) in the 2023 NEC) to NEC 120.130(A)(2), 120.130(B) and Table 120.130(A) (551.73(A) in the 2023 NEC). The answer did not change. Reason: citation now names the 2026 NEC subsections the calculation uses, not only the demand table.
  • Question O50199: question text revised. The answer did not change. Reason: stem now limits the calculation to one feeder that serves only 20/30-ampere sites, so the park can still meet the 50-ampere site percentage.
  • Question O50199: explanation revised. The answer did not change. Reason: explanation now says where the park's 50-ampere sites are and names the 41 percent factor from the 2026 table.
  • Question O50199: worked solution revised. The answer did not change. Reason: solution givens now match the one-feeder stem.
  • Question O51309: code reference changed from NEC Article 551 (RV site supply equipment) to NEC 551.77(D). The answer did not change. Reason: citation now points to the specific 2026 NEC section instead of the general article.
  • Question O51309: question text revised. The answer did not change. Reason: stem now asks about site supply equipment above the electrical datum plane, which is what the code measures.
  • Question O51309: explanation revised. The answer did not change. Reason: explanation now states the code's height range and drops the water-and-snow rationale that is not code text.
  • Question O50006: code reference changed from NEC 215.12(C)(1) to NEC 215.12(C)(2)(a)-(b). The answer did not change. Reason: this two-voltage-system question is governed by 215.12(C)(2), not the one-voltage-system rule in 215.12(C)(1).
  • Question O50006: answer option wording revised. The answer did not change. Reason: keyed option now makes clear that readily available documentation is an alternative to posting at each panelboard.
  • Question O50023: code reference changed from NEC 215.2(A)(1) to NEC 215.4(A)(1) (215.2(A)(1) in the 2023 NEC). The answer did not change. Reason: section renumbered in the 2026 NEC.
  • Question O50023: question text revised. The answer did not change. Reason: stem now states the general-rule condition by ruling out the 100%-rated assembly and other exceptions.
  • Question O50023: explanation revised. The answer did not change. Reason: explanation now covers every wrong option under the stated conditions.
  • Question O50023: worked solution revised. The answer did not change. Reason: solution now cites 215.4(A)(1) and the excluded exceptions.
  • Question O50074: code reference changed from NEC 215.3 to NEC 215.5 (215.3 in the 2023 NEC). The answer did not change. Reason: section renumbered in the 2026 NEC.
  • Question O50143: code reference changed from NEC 215.3 to NEC 215.5 (215.3 in the 2023 NEC). The answer did not change. Reason: section renumbered in the 2026 NEC.
  • Question O50426: code reference changed from NEC Article 215 (informational note on feeder voltage drop) to NEC 215.4(A)(2), Informational Note No. 2. The answer did not change. Reason: citation now points to the specific 2026 NEC section instead of the general article.
  • Question O50426: explanation revised. The answer did not change. Reason: explanation now says the 5 percent figure is an informational recommendation, not a mandatory limit.
  • Question O50420: code reference changed from NEC Article 215 (feeder equipment grounding conductor) to NEC 215.6. The answer did not change. Reason: citation now points to the specific 2026 NEC section instead of the general article.
  • Question O50420: explanation revised. The answer did not change. Reason: explanation no longer implies that a separate wire is always required.
  • Question O50421: code reference changed from NEC Article 215 (ground-fault circuit-interrupter protection for personnel) to NEC 215.9. The answer did not change. Reason: citation now points to the specific 2026 NEC section instead of the general article.
  • Question O50421: answer option wording revised. The answer did not change. Reason: keyed option now says the GFCI must be listed, as the rule states.
  • Question O50421: explanation revised. The answer did not change. Reason: explanation now limits the permission to the referenced GFCI provisions.
  • Question O52076: code reference changed from NEC 215.3 to NEC 215.5 (215.3 in the 2023 NEC). The answer did not change. Reason: section renumbered in the 2026 NEC.
  • Question O52076: question text revised. The answer did not change. Reason: stem now states that only the overcurrent device rule is applied, since conductor capacity is not given.
  • Question O52076: worked solution revised. The answer did not change. Reason: solution givens now match the revised stem.
  • Question O54029: code reference changed from NEC 215.2(A)(1) to NEC 215.4(A)(1) (215.2(A)(1) in the 2023 NEC). The answer did not change. Reason: section renumbered in the 2026 NEC.
  • Question O54029: question text revised. The answer did not change. Reason: stem now states that only the conductor ampacity rule is applied, since parallel installation and overcurrent device sizing are not part of the question.
  • Question O54029: explanation revised. The answer did not change. Reason: explanation now states the 125 percent conductor rule in plain terms.
  • Question O54029: worked solution revised. The answer did not change. Reason: solution givens now match the revised stem.
  • Question O50422: code reference changed from NEC Article 215 (diagrams of feeders) to NEC 215.13. The answer did not change. Reason: citation now points to the specific 2026 NEC section instead of the general article.
  • Question O51219: code reference changed from NEC Article 225 (overhead conductor size) to NEC 225.6(A). The answer did not change. Reason: citation now points to the specific 2026 NEC section instead of the general article.
  • Question O51218: code reference changed from NEC Article 225 (support of overhead conductors) to NEC 225.26. The answer did not change. Reason: citation now points to the specific 2026 NEC section instead of the general article.
  • Question O51218: explanation revised. The answer did not change. Reason: explanation drops the holiday-lighting allowance, which was not confirmed for 225.26 in the 2026 reading.
  • Question O50212: code reference changed from NEC 225.32 to NEC 225.31(B) (225.32 in the 2023 NEC). The answer did not change. Reason: section renumbered in the 2026 NEC.
  • Question O50212: question text revised. The answer did not change. Reason: stem now asks only about an inside disconnect, since inside and outside locations have different rules.
  • Question O50212: answer option wording revised. The answer did not change. Reason: keyed option no longer merges the inside and outside location rules.
  • Question O50212: explanation revised. The answer did not change. Reason: explanation now separates the inside rule from the outside rule.
  • Question O51071: code reference changed from NEC Article 225 (feeder disconnecting means) to NEC 225.33(A). The answer did not change. Reason: citation now points to the specific 2026 NEC section instead of the general article.
  • Question O51071: question text revised. The answer did not change. Reason: stem now asks about one supply, since the six-device limit applies per supply.
  • Question O51071: explanation revised. The answer did not change. Reason: explanation now states that the limit is per supply.
  • Question O51072: code reference changed from NEC Article 225 (identification of feeders) to NEC 225.37. The answer did not change. Reason: citation now points to the specific 2026 NEC section instead of the general article.
  • Question O51072: question text revised. The answer did not change. Reason: stem now excludes the industrial-installation exception the code allows.
  • Question O51072: answer option wording revised. The answer did not change. Reason: keyed option now includes other services and the area served, as the rule requires.
  • Question O51072: explanation revised. The answer did not change. Reason: explanation now lists everything the plaque or directory must identify.
  • Question O50044: code reference changed from NEC 210.8(B) to NEC 210.8(B)(2). The answer did not change. Reason: citation now points to the specific 2026 NEC list item instead of the whole subsection.
  • Question O50429: code reference changed from NEC 210.8(B) to NEC 210.8(B)(5). The answer did not change. Reason: citation now points to the specific 2026 NEC list item instead of the whole subsection.
  • Question O51078: code reference changed from NEC 210.8(A) to NEC 210.8(A)(9) and the 210.8 measurement rule. The answer did not change. Reason: citation now points to the specific 2026 NEC subsection instead of the whole section.
  • Question O51078: question text revised. The answer did not change. Reason: stem now states the distance the way the code measures it, from the top inside edge of the bowl along the shortest cord path.
  • Question O51078: explanation revised. The answer did not change. Reason: explanation now uses the 2026 measurement method.
  • Question O51290: code reference changed from NEC 210.8(A) to NEC 210.8(A)(11) and the 210.8 measurement rule. The answer did not change. Reason: citation now points to the specific 2026 NEC subsection instead of the whole section.
  • Question O51290: question text revised. The answer did not change. Reason: stem now gives the shortest cord path instead of a straight-line distance and asks only about the bathtub requirement.
  • Question O51290: explanation revised. The answer did not change. Reason: explanation now uses the 2026 measurement method and notes that AFCI and location rules still apply separately.
  • Question O50038: code reference changed from NEC 210.12(E) to NEC 210.12(E)(1)-(2) and Exception; 210.12(A). The answer did not change. Reason: citation now names both permitted methods and the exception.
  • Question O50038: answer option wording revised. The answer did not change. Reason: keyed option now presents the two methods as examples rather than the complete list.
  • Question O50038: explanation revised. The answer did not change. Reason: explanation no longer presents the two named methods as the only permitted ones.
  • Question O51081: code reference changed from NEC 210.12 to NEC 210.12(D)(1). The answer did not change. Reason: citation now points to the specific 2026 NEC list item instead of the whole section.
  • Question O51081: explanation revised. The answer did not change. Reason: explanation now notes that the 2026 rule also covers 10-ampere circuits.
  • Question O51280: code reference changed from NEC 210.12 to NEC 210.12(A)(4)(b) (same limits in 210.12(A)(3)(b)). The answer did not change. Reason: citation now points to the specific 2026 NEC subsection instead of the whole section.
  • Question O51280: question text revised. The answer did not change. Reason: stem now names the specific AFCI method, copper conductor and continuous wiring that the length limit applies to.
  • Question O51280: explanation revised. The answer did not change. Reason: explanation now ties the length limit to the specified methods instead of all AFCI arrangements.
  • Question O50042: code reference changed from NEC 210.11(C)(4) to NEC 210.11(C)(4), Exceptions No. 1 and No. 2. The answer did not change. Reason: citation now names both exceptions to the garage circuit rule.
  • Question O50042: question text revised. The answer did not change. Reason: stem now rules out the single-bay exception so the keyed option is complete.
  • Question O50042: explanation revised. The answer did not change. Reason: explanation now mentions the single-bay exception and why it does not apply.
  • Question O50323: code reference updated to the 2026 NEC location 120.141 and Table 120.141 (was 550.31); the 2026 NEC moved mobile home park demand factors to Article 120, and the 25% factor for 20 lots is unchanged. The answer did not change. Reason: section renumbered in the 2026 NEC.
  • Question O50029: code reference narrowed to the 2026 NEC subdivision 120.140(A)(1), which holds the 3 VA per square foot lighting load for a mobile home (was 120.140). The answer did not change. Reason: section renumbered in the 2026 NEC.
  • Question O50052: code reference updated to the 2026 NEC location 406.12(D)(3) (was 406.4(D)(3)). The answer did not change. Reason: section renumbered in the 2026 NEC.
  • Question O50166: code reference updated to the 2026 NEC location 406.12(D)(2) (was 406.4(D)(2)). The answer did not change. Reason: section renumbered in the 2026 NEC.
  • Question O50245: code reference updated to the 2026 NEC location 406.12(D)(4) (was 406.4(D)(4)). The answer did not change. Reason: section renumbered in the 2026 NEC.
  • Question O50199: code reference updated to the 2026 NEC location Table 120.130(A) (was 551.73(A)); the 2026 NEC moved RV park demand factors to Article 120, and the 42% factor for this number of sites is unchanged. The answer did not change. Reason: section renumbered in the 2026 NEC.
  • Question O50029: code reference updated to the 2026 NEC location 120.140 (was 550.18(A)(1)); the 2026 NEC moved mobile home load calculations to Article 120. The answer did not change. Reason: section renumbered in the 2026 NEC.
  • Question O50071 (dwelling demand load): the question used 3 VA per square foot for dwelling general lighting. The external review found that the 2026 NEC dwelling unit load is 2 VA per square foot. The stem now states 2 VA per square foot and the correct answer is 4,925 VA (it was 5,625 VA).
  • Question O50101 (dwelling general lighting load): the question used 3 VA per square foot. The external review found that the 2026 NEC dwelling unit load is 2 VA per square foot. The stem now states 2 VA per square foot and the correct answer is 4,800 VA (it was 7,200 VA).
  • Question O50238 (range hood cord length): the keyed answer said 18 to 36 inches. The external review read the 2026 NEC limit as 18 inches to 4 feet. The answer now reads 18 inches to 4 feet.
  • Question O50084 (mobile home demand load) is withdrawn: the external review could not confirm whether the mobile-home rule or the 2026 Article 120 unit load applies, so we removed it instead of guessing.
  • Question O50310 (retail lighting load for a feeder) is withdrawn: the external review found the 125% step does not belong in the 2026 load calculation, which conflicts with how the question was worded, so we removed it instead of rewording it unchecked.
  • Question O50014: code reference corrected to the 2026 NEC location 404.2(C) (was Article 406, Part III (grounded conductor at switch locations; 404.2(C) in the 2023 NEC)). The answer did not change.
  • Question O50016: code reference corrected to the 2026 NEC location 110.29 (was Article 100 (In Sight From); NEC 430.102). The answer did not change.
  • Question O50027: code reference corrected to the 2026 NEC location 120.54 (was 120.54 (220.54 before the 2026 NEC)). The answer did not change.
  • Question O50037: code reference corrected to the 2026 NEC location 210.8(A)(12) (was 210.8(A)(10)). The answer did not change.
  • Question O50038: code reference corrected to the 2026 NEC location 210.12(E) (was 210.12(D)). The answer did not change.
  • Question O50045: code reference corrected to the 2026 NEC location 300.7(D)(1) (was 300.5(D)(1)). The answer did not change.
  • Question O50047: code reference corrected to the 2026 NEC location 300.7(B); 334.12(B) (was 300.5(B); 334.12(B)). The answer did not change.
  • Question O50051: code reference corrected to the 2026 NEC location 300.9(A) (was 300.7(A)). The answer did not change.
  • Question O50077: code reference corrected to the 2026 NEC location 250.122(D) (was 250.122(B)). The answer did not change.
  • Question O50102: code reference corrected to the 2026 NEC location Table 120.45 (was Article 120 (lighting load demand factors; 220.45 in the 2023 NEC)). The answer did not change.
  • Question O50147: code reference corrected to the 2026 NEC location 210.12(B) (was 210.12(A)). The answer did not change.
  • Question O50156: code reference corrected to the 2026 NEC location Table 300.7(A), Column 1 (was 300.5(A), Table 300.5). The answer did not change.
  • Question O50159: code reference corrected to the 2026 NEC location 300.16(A) (was 300.14). The answer did not change.
  • Question O50206: code reference corrected to the 2026 NEC location 250.24(D) (was 250.24(C)). The answer did not change.
  • Question O50214: code reference corrected to the 2026 NEC location 210.8(A)(6) (was Article 210 (GFCI protection for dwelling-unit receptacles; 210.8(A) in the 2023 NEC)). The answer did not change.
  • Question O50228: code reference corrected to the 2026 NEC location 300.15(B) (was 300.13(B)). The answer did not change.
  • Question O50232: code reference corrected to the 2026 NEC location Table 300.7(A), Column 3 (was 300.5 (minimum cover for underground installations)). The answer did not change.
  • Question O50251: code reference corrected to the 2026 NEC location 404.9 (was 404.7). The answer did not change.
  • Question O50257: code reference corrected to the 2026 NEC location 680.71 and 680.75 (was 680.71). The answer did not change.
  • Question O50313: code reference corrected to the 2026 NEC location 120.14(I) and Table 120.47 (was Article 120 (non-dwelling receptacle load demand; 220.44 in the 2023 NEC)). The answer did not change.
  • Question O50054: code reference corrected to the 2026 NEC location 410.16(D)(1) (was 410.16(C)(1)). The answer did not change.
  • Question O50162: code reference corrected to the 2026 NEC location 358.24(B) (was 358.26). The answer did not change.
  • Question O50170: code reference corrected to the 2026 NEC location 410.16(C) (was 410.16(B)). The answer did not change.
  • Question O50187: code reference corrected to the 2026 NEC location 550.51(A) (was 550.32(A)). The answer did not change.
  • Question O50234: code reference corrected to the 2026 NEC location 312.4(A) (was 312.2). The answer did not change.
  • Question O50237: code reference corrected to the 2026 NEC location 410.71 (was 410.130(G)). The answer did not change.
  • Question O50244: code reference corrected to the 2026 NEC location 406.12(A) (was 406.4(A)). The answer did not change.
  • Question O50256: code reference corrected to the 2026 NEC location 550.51(C) (was 550.32(C)). The answer did not change.
  • Question O50103 (single-phase service load in amperes): the explanation said 120 A comes from adding 25%; 100 x 1.25 is 125 A. The explanation now gives the arithmetic behind each wrong option. The correct answer (100 A) did not change.

Checks before publication

  • 2 calculation questions added after a check against the 2026 NEC and a separate review pass (one rewritten for the 2026 RV-site receptacle rule, one with its 2026 code location). The set now has 1,002 questions and 10 full two-part mocks.
  • 753 questions added after a separate review pass: 624 passed and 129 were corrected before release. The set now has 1,000 questions, 9 full two-part mocks with no question shared between mocks, and step-by-step solutions for all 297 calculation questions.
  • 69 questions added after a check of 85 new drafts: 65 passed, 4 were corrected (three code references set to the level that could be confirmed, one stem now states the welder duty cycle) and 16 were removed because they repeated an existing question. Step-by-step solutions were added for 58 more calculation questions after the same check (4 corrected: three for rounding or arithmetic wording, one rebuilt for a corrected question).
  • 95 questions added after a check of 100 drafts: all references moved to 2026 NEC numbering, three questions reworded to stand alone, one explanation corrected, and 5 drafts removed (four repeated an existing question, one depended on a GFCI location list that could not be confirmed for the 2026 NEC).
  • Step-by-step solutions for the 26 Calculations questions were checked before release: all 26 passed; lookup paths are taken only from each question's own checked NEC reference.
  • 55 questions were added after a check: all 55 passed.
  • Check of the first 30 questions: 22 passed and 8 were corrected before publication (2026 NEC renumbering where Article 220 became Article 120, a switch rule moved to Article 406, PV disconnect references, one branch-circuit reference, and one question's room changed from a hallway to a bedroom).

Found a mistake? Answer any question, then use "Report a problem with this question" under the answer. This log is also available as data at https://www.tsaielectro.com/wp-json/gck-exam/v1/corrections/US.

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