Quick Hits

EPISODE 3 — Conductor Identification: Grounded, EGC & Ungrounded (310.6)

Slide 1 — Hook "Today: the color-coding and identification rules for every type of conductor — up to 1000V, and the medium-voltage tier just above it."

Slide 2 — 310.6(A) — up to 1000V

• Grounded conductors: identified per 200.7 (the classic white/gray rule).

• Equipment grounding conductors: identified per 250.119 (green, or green with yellow stripe).

• Ungrounded conductors: must be finished so they're CLEARLY distinguishable from grounded conductors and EGCs — and that distinguishing marking can't conflict with the surface markings required by 310.8(B)(1). Branch circuits fed from more than one voltage system follow 210.5(C); feeders from more than one system follow 215.12(C). An exception across all three lets identification follow 200.8 instead where applicable.

Slide 3 — 310.6(B) — 1001V through 2000V

• Same basic structure, shifted to the medium-voltage-adjacent citations: grounded conductors still follow 200.7; EGCs follow 270.119 (notice — this points to the Article 270 EGC identification rule, not 250.119); ungrounded conductor distinguishability rule is identical in concept, but branch circuits follow 265.5(C) and feeders follow 266.12(C) instead.

Slide 4 — Quiz + CTA Q: "For conductors rated 1001V through 2000V, equipment grounding conductor identification follows which section?" A) 250.119 B) 270.119 C) 200.7 D) 310.8

✅ Answer: B — 310.6(B)(2): EGC identification at this voltage tier points to 270.119.

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