Quick Hits

🎬 EPISODE 2: Corrosion, Cinder Fill & Physical Damage

SLIDE 1 — HOOK

"Old building with cinder fill? Here's what the Code actually says."

SLIDE 2 — THE QUICK HITS

• Galvanized/stainless EMT allowed in cinder concrete/fill if: ✅ Covered by 2 in. (50 mm) of non-cinder concrete, OR ✅ Installed at least 18 in. (450 mm) below the fill [358.10(C)]

• Wet locations: all supports, bolts, straps & screws must be corrosion-resistant [358.10(D)]

• Steel/stainless EMT is permitted where subject to physical damage [358.10(E)]

• Not permitted: severe physical damage locations, or supporting luminaires (except small conduit bodies) [358.12]

• Dissimilar metals should be avoided to prevent galvanic action [358.14]

SLIDE 3 — REVIEW + CTA

Quick Quiz: 1️⃣ How deep must EMT be buried under cinder fill (without noncinder concrete cover)? 2️⃣ Can EMT support a luminaire?

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