Quick Hits

EPISODE 2 — Building Separation, Outside Conductors, Other Conductors & Raceway Seals (268.5–268.8)

Slide 1 — Hook "Today: rules about where service conductors can and can't run, and what else is allowed to share their space."

Slide 2 — 268.5 & 268.6

• 268.5: Service conductors feeding one building can NEVER pass through the interior of another building.

• 268.6: Conductors count as "outside the building" if they're under 2"+ of concrete beneath the structure, in a raceway encased in 2"+ of concrete/masonry INSIDE the building, in a vault meeting Article 450 Part III construction rules, or buried 18"+ deep in conduit beneath the building.

Slide 3 — 268.7 & 268.8

• 268.7: Other circuit conductors generally CANNOT share a raceway/cable/handhole/underground box/cable tray/cablebus with service conductors — except grounding electrode conductors, supply-side bonding jumpers, overcurrent-protected load management control conductors, and overcurrent-protected sump pump conductors (the last one specifically for underground boxes).

• 268.8: Where a service raceway enters a building, it must be sealed per 305.15(F)/305.16(A) — spare/unused raceways get sealed too, using sealants identified for the cable/conductor insulation involved.

Slide 4 — Quiz + CTA Q: "Can service conductors for one building pass through the interior of a different building?" A) Yes, if properly protected B) No — never permitted C) Only if under 5000V D) Only with special permission

✅ Answer: B — 268.5 prohibits this outright, no exceptions.

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