Quick Hits

EPISODE 7 — Wiring Methods, Cable Trays and Splicing for Service-Entrance Conductors (268.43, 268.44, 268.46)

Slide 1 — Hook "What wiring methods are actually allowed for medium/high-voltage service-entrance conductors — and the rules for running them in cable tray."

Slide 2 — 268.43 Approved wiring methods A long list, but good to know as a group: open wiring on insulators, RMC, IMC, EMT, busways, PVC, cablebus, Type MC cable, HDPE conduit, NUCC, RTRC, voltage-rated Type TC-ER cable identified for service-entrance use, and insulated bus pipe (IBP).

Slide 3 — 268.44 Cable trays & 268.46 Splicing

• Cable trays CAN support service-entrance conductors, but ONLY these types: Type MC cable, single Type MV conductors 1/0+ listed for cable tray use, or Type TC-ER cable — and the tray must contain ONLY service-entrance conductors (unless a listed solid fixed barrier separates them from other conductors in the same tray). Trays must be permanently labeled "Service-Entrance Conductors," visible, spaced no more than 10 ft apart, so the run is traceable end-to-end.

• 268.46: splices/taps are permitted per 110.40, 305.15(D), 305.23, 305.25 — and any pressure connectors or splice/tap devices used must be LISTED.

Slide 4 — Quiz + CTA Q: "A cable tray supporting service-entrance conductors must be labeled at intervals not exceeding what distance?" A) 5 ft B) 10 ft C) 15 ft D) 20 ft

✅ Answer: B — 268.44: labels spaced no more than 10 ft (3 m) apart.

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