Quick Hits

EPISODE 3 — Physical Damage Protection Pt.1: Wood, Framing & Roof Decking (305.14(A)–(D))

Slide 1 — Hook "Today: this whole set will feel familiar from Article 300 — with one key difference: at this voltage, it's raceways only, not cables, since exposed cable needs qualified-persons-only access anyway."

Slide 2 — 305.14(A) Wood members

• Bored holes: raceway edge must clear the wood member's edge by at least 1¼" — or get steel-plate/bushing protection at least 1/16" thick (RMC/IMC/PVC/RTRC/EMT exempt; listed thinner plates okay if equally protective).

• Notches: same 1/16" steel plate rule, installed before the finish goes up, same exemptions.

Slide 3 — 305.14(B), (C), (D)

• (B) Raceways parallel to framing members/furring strips: keep 1¼" clearance from the edge where nails/screws could hit, or add 1/16" steel plate/sleeve protection (same metal-raceway exemptions apply).

• (C) Under metal-corrugated roof decking: maintain at least 1½" from the decking's lowest surface; NEVER install concealed in this type of roof. RMC/IMC with listed steel/malleable iron fittings are exempt, and the spacing isn't required if the decking's topped with 2"+ concrete.

• (D) Shallow grooves (covered by wallboard/siding/paneling): 1/16" steel plate/sleeve OR 1¼" free space the full length of the groove (same exemptions).

Slide 4 — Quiz + CTA Q: "Under metal-corrugated roof decking, what's the minimum required separation from the decking's lowest surface?" A) 1 in. B) 1½ in. C) 2 in. D) 3 in.

✅ Answer: B — 305.14(C): at least 1½" (38 mm).

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