How to size an air conditioner circuit from the nameplate MCA and MOCP, why a water heater circuit is sized at 125%, where the disconnect goes, and two worked examples…
Updated 2026-10-12 · Read the article ›Learn the 2026 NEC rules for receptacles, switches, luminaires and ceiling fan support, including replacement receptacles, switch-box neutrals, damp and wet locations, and 180 VA receptacle load calculations for Texas…
Updated 2026-10-17 · Read the article ›How deep to bury cable and conduit under the NEC, what "cover" means, the shallower depths for GFCI residential circuits, driveways and parking areas, warning ribbon, wet-location conductors and protection…
Updated 2026-10-12 · Read the article ›How a residential electrical service is put together, from the utility point to the main disconnect and panelboard: what counts as service equipment, where neutral and ground are bonded, why…
Updated 2026-10-12 · Read the article ›How to calculate voltage drop on a single-phase or three-phase circuit with Chapter 9 Table 8 resistance values, what the NEC's 3% and 5% informational notes mean, and a worked…
Updated 2026-10-12 · Read the article ›How Articles 705 and 706 treat interconnected power sources and energy storage: supply-side and load-side connections, the 120% busbar rule with a worked 200 A panel example, disconnecting means, shutdown…
Updated 2026-10-12 · Read the article ›What Article 517 asks of wiring in hospitals and other health care facilities: the four patient care space categories, redundant grounding, receptacle counts and branch circuits at general care and…
Updated 2026-10-17 · Read the article ›How the NEC treats commercial repair garages and motor fuel dispensing facilities: why the floor area can be a Class I location, the classified zone around a fuel dispenser, conduit…
Updated 2026-10-12 · Read the article ›How the NEC treats fixed electric space heating and outdoor deicing equipment: sizing the branch circuit at 125%, baseboard heaters and receptacles, disconnects and thermostats, and ground-fault protection for snow-melting…
Updated 2026-10-12 · Read the article ›What Article 408 asks of panelboards and switchboards: a clear circuit directory, source marking, overcurrent protection for the panel, backfed breaker fasteners, closing unused openings, and the high leg on…
Updated 2026-10-12 · Read the article ›