Quick Hits

PART II — BUILDINGS OR OTHER STRUCTURES SUPPLIED BY A FEEDER(S) OR BRANCH CIRCUIT(S)

EPISODE 6 — Number of Supplies to a Building (267.30)

Slide 1 — Hook "New Part! Just like services, a building fed by an outside feeder/branch circuit is generally limited to ONE supply — here's the exceptions."

Slide 2 — The general rule

• A building/structure fed by a branch circuit or feeder (on the load side of a service disconnect) generally gets only ONE feeder or branch circuit — unless 267.30(A)-(E) applies.

• Same one-supply-back logic applies in reverse: if a branch circuit/feeder originates IN that additional building and sends power BACK to the original building, that's also limited to one, absent an exception.

Slide 3 — The exceptions

• (A) Special conditions: fire pumps, emergency systems, legally required standby, optional standby, parallel power production, multi-source reliability systems, EV power transfer systems listed for multiple circuits, and docking facilities/piers.

• (B) Common supply equipment: up to 6 feeders from the SAME equipment, each terminating in its own disconnect, are allowed IF all disconnects are grouped together at one location (and marked for their load) — this bypasses the normal grouping rule in 267.33.

• (C) Special occupancies: multi-occupancy buildings with no shared equipment space, or single large structures needing multiple supplies — by special permission.

• (D) Different characteristics: different voltage/frequency/phase/use.

• (E) Documented switching procedures: single-management sites with established, maintained safe switching procedures.

Slide 4 — Quiz + CTA Q: "Under 267.30(B), how many feeders originating from the same equipment can supply a building, if each terminates in its own disconnect and all are grouped?" A) 2 B) 4 C) 6 D) Unlimited

✅ Answer: C — 267.30(B): up to six feeders under those conditions.

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