NEC 2026 Code Book: Key Changes, New Rules & What Electricians Need to Know
NEC 2026 changes explained for electricians: arc flash labels, AFCI in bathrooms & garages, EV charging rules, 2 VA/ft2 load calc, and the structural reorganization.
Electrical Gutters (Auxiliary Gutters): NEC Article 366 Rules & Sizing Guide
Complete guide to electrical gutters (auxiliary gutters) under NEC Article 366 — permitted uses, the 20% fill rule, conductor sizing, ampacity adjustment, vs wireways, and a worked sizing example.
Transformer Sizing Chart: How to Size a Transformer by kVA
Complete transformer sizing guide — kVA formulas for single-phase and three-phase, standard kVA sizes chart, NEC 450.3 OCPD sizing, power factor, K-factor, and 6 worked examples.
NEC Code Book Editions: 2017 vs 2020 vs 2023 vs 2026 Differences
Complete comparison of NEC 2017, 2020, 2023, and 2026 editions. Key changes between editions, state adoption map, which edition to use for your exam, and what changed when.
Electrical Room Signage: NEC & NFPA Requirements for Panels & Equipment
Complete guide to required electrical room signage — NEC 110.21, arc flash labels (110.16), fault current marking, available fault current, working clearance signs, and OSHA requirements.
GFCI vs Arc Fault (AFCI): Differences, Requirements & Where Each Is Required
Complete guide to GFCI vs AFCI — how each works, the hazard each prevents, every NEC 2023 required location, dual-function devices, and how they differ from regular breakers.
Pull Box & Junction Box Sizing: NEC Rules with Chart
Undersizing a pull box is one of the most common violations on commercial and industrial installations. Too small and conductors get kinked on installation,...
Multi-Wire Branch Circuits: NEC Code Rules & Safety Requirements
A multi-wire branch circuit (MWBC) lets you run two 120V circuits with three conductors instead of four. That sounds like a simple efficiency gain...
What Does NEC Stand For? Understanding the National Electrical Code
NEC stands for National Electrical Code.
In the electrical trade, the NEC is one of the most important code books you will use. NFPA describes...
Electrical Safety Program Explained: What It Is and Why Workplaces Need One
An electrical safety program is the overall set of policies, procedures, training, and controls a workplace uses to reduce electrical hazards such as shock,...
Kitchen Island Outlet Code (2026 NEC): GFCI & Placement Rules
Kitchen island and peninsula receptacles trip up more electricians than almost any other rough-in detail — not because the rule is complicated, but because...
GFCI Testing: How to Check a GFCI Outlet the Right Way
GFCI testing is the process of checking whether a ground-fault circuit interrupter trips and resets the way it should.
That matters because a GFCI is...
