UNIT 1.5 — IDENTIFICATION

Conductor colors and terminal identification

CERT 1 · DC/AC Theory & Safety · ~9 min

Community content — not verified by a licensed electrician. Lessons and questions here are written for study practice and pinned to NEC 2023. Code editions and local amendments vary by jurisdiction. Always confirm against your adopted code book and your licensing board's published exam outline before test day.

In North American residential wiring, insulation color communicates function. Black (or red) is an ungrounded 'hot' conductor carrying line voltage. White is the grounded 'neutral' conductor, the return path. Bare copper or green insulation is the equipment grounding conductor — a safety path that carries current only during a fault.

Devices repeat the code in metal: brass-colored screw terminals receive hot conductors, silver-colored terminals receive neutrals, and the green screw bonds the grounding conductor. Reversing hot and neutral ('reversed polarity') leaves device shells energized even when switched off — a classic inspection failure.

This mapping — black→brass, white→silver, bare/green→green — is exactly what the Wiring Sandbox validates. Get it into muscle memory here before you ever open a real device box.

Exam focus: pure recall plus one twist — the difference between the *grounded* conductor (neutral, white) and the *grounding* conductor (EGC, green/bare). Exams love that one-letter distinction.

Hot
Black/Red → Brass
Neutral
White → Silver
Ground
Bare/Green → Green
Knowledge check

Quiz — 3 questions

1. The white conductor lands on which terminal?

2. The 'grounded conductor' refers to the:

3. Reversed polarity means:

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