Quick Hits
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EPISODE 2 — Uses Permitted and Not Permitted Armored Cable (320.10, 320.12)
EPISODE 2 — Uses Permitted and Not Permitted Armored Cable (320.10, 320.12)
Slide 1 — Hook "Today: where Type AC cable is allowed to go — and the specific situations where it's flatly off-limits."
Slide 2 — 320.10 Uses permitted
Feeders and branch circuits, both exposed and concealed.
Cable trays.
Dry locations.
Embedded in plaster finish on brick/masonry — EXCEPT in damp or wet locations.
Run or fished in air voids of masonry block/tile walls — as long as those walls aren't exposed to excessive moisture/dampness.
(This "uses permitted" list is explicitly not all-inclusive — other permitted uses can exist too.)
Slide 3 — 320.12 Uses NOT permitted
Where subject to physical damage.
In damp or wet locations.
In air voids of masonry block/tile walls that ARE exposed to excessive moisture/dampness.
Where exposed to corrosive conditions.
Embedded in plaster finish on brick/masonry IN damp or wet locations.
Notice the pattern: nearly every "not permitted" entry is the direct inverse of a "permitted" entry — moisture and physical damage are the two consistent disqualifiers for Type AC.
Slide 4 — Quiz + CTA Q: "Is Type AC cable permitted in damp or wet locations?" A) Yes, always B) No — never permitted C) Only if painted with a sealant D) Only in cable trays
✅ Answer: B — 320.12(2) flatly prohibits Type AC in damp or wet locations.
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⚠️ Educational NoticeQuick Hits are educational explanations based on my understanding of the NEC. Always verify requirements in the current adopted NEC, applicable local amendments, manufacturer instructions, and with the AHJ.
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