Electricians
US Wire Color Code: What the NEC Actually Requires
What the NEC actually requires for hot, neutral and ground wire colors, with the exact sections — and which colors are only convention.
Open guide ElectriciansReading the Print on THHN Wire
What the printing on US building wire means, and whether your THHN is rated for wet locations. Decoded with the NEC definitions.
Open guide ElectriciansWhy You Cannot Size Wire Off the 90 Degree Column
The 90 degree C column is for derating, not for sizing. What 110.14(C) requires, why terminations set the limit, and how to use both columns correctly.
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