Short answer: Compare residential and commercial electrical work through the actual project documents. Confirm the system, equipment, occupancy, environment and required method, then ask which instructions and supervision apply to your assigned task.
Replace a building label with project information
Record what the approved drawings and supervisor actually say about occupancy, system configuration, equipment, wiring method and environment. Mark missing information as awaiting confirmation.
OSHA’s electrical definitions distinguish branch circuits, feeders, wet locations and hazardous locations. Identify which of those conditions applies to the actual task.
Ask five questions at the new job
- Which current drawing set and specifications govern this task?
- What system and voltage are actually shown?
- Which equipment and wiring method are specified?
- What environmental or occupancy conditions affect the requirements?
- What instruction and supervision do I need before beginning?
Use the answers to build a side-by-side comparison of two trainer-supplied projects.
Keep the 2026 NEC and the project conditions visible
TDLR’s September 2026 announcement identifies adoption of the 2026 NEC with a limited outdoor-outlet GFCI exception.
Use 2026 NEC study material, then verify the actual permit, applicable jurisdictional requirements, approved documents and equipment instructions with the responsible person. A commercial label does not by itself establish system voltage or make another project’s method applicable.
Explain the difference with its source
On the training drawings, mark three facts that differ and one assumption you initially made. Identify the source that resolved the assumption. Bring a conflict between documents to the supervisor with the precise references.
Keep the exercise on paper; equipment opening, testing and rewiring require the relevant authorized work process.
Confirm the new project’s actual conditions
Confirm the new project’s actual conditions
Use the actual documents for the two training projects and keep unconfirmed items visible.
- I obtained the actual current project documents
- I confirmed the shown system rather than guessing
- I listed occupancy and environmental conditions
- I identified the required method from the project information
- I asked about task training and supervision
Compare two projects by their source documents
Place the source document beside each comparison so you can explain the difference accurately.
Item to compare | First training project | Second training project | Source document | Unconfirmed assumption —|—|—|—|— | | | |
Check three assumptions about a new site
1. What establishes the system voltage for the assigned task?
- A. The building’s commercial classification
- B. The current drawings and equipment information
- C. The voltage used on a similar completed project
2. Which information supports transferring a familiar method to another job?
- A. The new task’s applicable requirements and approved documents
- B. A similar-device photo without ratings or installation conditions
- C. Acceptance on the previous project without checking this project’s requirements
3. A general guide and the drawing conflict. What helps the supervisor resolve it?
- A. The guide’s general rule without checking its scope or edition
- B. The drawing alone, setting the unresolved conflict aside
- C. The exact document references and point of disagreement
Check three assumptions about a new site: answers
- B. Read the project’s actual system information.
- A. A method must fit the new task’s actual conditions.
- C. Bring a precise discrepancy forward for resolution.
Starting your first year as a Texas apprentice? The US$19 Texas First-Year Electrical Apprentice Kit gives you printable pages for the first months on the job: a tool-check card, a who-to-ask list with a short stop-and-ask script, emergency-contact and heat-and-rest cards, plus a Tool budget sheet and a Tool inventory sheet (CSV).
Log your Texas Journeyman hours free. A free Tsai Electro account keeps your supervised hours, your online practice scores and your exam date in one place. Start with a five-question check to see which topic to practice next.
Practice the calculation change as well as the jobsite change. The Texas Journeyman Electrician Exam Prep Book (2026 NEC) includes separate lessons for dwelling service loads and commercial feeder loads, plus topic questions with worked answers. Compare the given conditions in those exercises and follow the method each requires.
What should I compare first?
Start with the current documents, the shown system and the conditions affecting your assigned task.
How can I practice the comparison?
Use two trainer-supplied drawing sets and explain each difference with its source.
