Requirements for branch circuits, feeders, and services each have their own Articles (210, 215, and 230, respectively). The NEC also contains an Article providing requirements for outside branch ...

As the 2026 NEC takes effect, facility managers and procurement teams face a new landscape for LED retrofits: general lighting load calculations have dropped from 3 VA/ft² to 2 VA/ft², and GFCI ...

Members of the National Fire Protection Association (NFPA) recently concluded discussions on updating Article 220.12 of the NEC (National Electrical Code) to align with a series of energy codes, as ...

The 2026 National Electrical Code introduces important updates to conductor sizing, load calculations, and safety measures that electrical pros must understand. From adding 16 AWG copper allowances ...

This is part 1 in an ongoing series on HVAC load calculations. The folks at SNIPS have asked me to do a basic how-to article about HVAC Manual J load calculation as that is allegedly a big part of my ...

To avoid confusion, follow the NEC sequence when performing your circuit calculations. You'll see this sequence in each of the Annex D examples. You'll also see it in the structure of the Chapter 2 ...