📐 Reference Library
Tables, formulas, diagrams, and field workflows — the stuff you look up on the tailgate.
Voltage Drop: Why It Matters and How to Calculate It
Every conductor has resistance, and every foot of wire costs you a little voltage. Here's the working electrician's guide to voltage drop: the formulas, the NEC recommendations, and the field shortcuts — plus our calculator that does it for you.
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Wire Color Codes: What the Colors Mean (and When They Lie)
Black is hot, white is neutral, green is ground — until a switch loop, a 240V circuit, or a previous owner's creativity says otherwise. The color conventions, the legal re-markings, and the rule that colors are clues, not proof.
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