Dual 4/0 SER feeders to separate 200A panels from a 320A pedestal — Table 250.66 says size GEC on largest ungrounded conductor, not parallel. Inspector wants 320A service basis. NEC text, table values, and field consensus for #4 vs #2 copper GEC.
July 9, 2026
Water heaters sit near water — so why does NEC not require GFCI like pools under Article 680? The difference between receptacle GFCI rules (210.8), cord-connected appliances (422.5), and hardwired fixed equipment explained for the trade.
July 9, 2026
Power company wants 12 feet over a grass backyard — you thought NEC required 10 feet minimum. NEC 225.18 clearance table explained: pedestrian areas vs residential property vs driveways, and when utility standards exceed NEC.
July 9, 2026
A refrigerator moved 10 feet from the only sink — does NEC require a dedicated circuit, GFCI protection, or can it share one of the two required small-appliance branch circuits? NEC 210.52(B) and 210.8 analyzed with a decision chart.
July 9, 2026
Five current-carrying conductors in a raceway trigger Table 310.15(C)(1) derating. A continuous motor branch circuit triggers 125% conductor sizing per 430.22. Here is how both rules apply to #12 THHN feeding a 14-amp motor — with NEC tables and a worked example.
July 9, 2026
Quick Answer: A breaker keeps tripping because it is doing its job — detecting more electrical current than the circuit is designed to handle and shutting it off…
May 1, 2026
Mr Electric
Quick Answer: The 2020 National Electrical Code (NEC), Section 230.85, now requires an emergency disconnect installed outside your home on all one- and two-family dwellings. In Florida this…
April 29, 2026
Mr Electric
Arc-Fault Circuit Interrupters are required in virtually every finished room of Florida homes. Learn where AFCI protection applies, the difference between AFCI and GFCI, and what triggers the requirement during renovations.
April 27, 2026
Mr Electric
