Quick Hits

EPISODE 1 — Scope & Listing Requirements (320.1, 320.2)

Slide 1 — Hook "New article! Type AC cable — the classic 'armored cable,' often called 'BX' on job sites. Today: what it is, and how it's different from its cousin, Type MC." Text overlay: ARTICLE 320 — ARMORED CABLE (TYPE AC) 🔌 Part 1 of 6

Slide 2 — 320.1 Scope + the AC vs. MC distinction

• Covers use, installation, and construction specs for Type AC cable.

• Type AC is listed in 14 AWG-1 AWG copper (12 AWG-1 AWG aluminum/copper-clad aluminum), rated 600V or less.

• Worth knowing: Type AC and Type MC cable look nearly identical in common branch-circuit sizes, but they're built to DIFFERENT product standards (UL 4 for AC, UL 1569 for MC) — and several NEC sections specifically require one or the other by name. Recognizing which one you actually have matters for code compliance, not just terminology.

• Distinguishing features of Type AC: a paper wrap on the individual insulated conductors, and an internal 16 AWG aluminum bonding strip running the cable's full length in contact with the armor.

Slide 3 — 320.2 Listing requirements Must be listed and identified: Type AC cable itself; cable ties/staples/straps/hangers used with it; and Type AC cable fittings used to connect the cable to boxes, cabinets, or other equipment.

Slide 4 — Quiz + CTA Q: "What internal feature distinguishes Type AC cable from Type MC cable?" A) A copper ground wire only B) A paper wrap on conductors plus an internal aluminum bonding strip C) An external nonmetallic jacket D) There is no meaningful construction difference

✅ Answer: B — Type AC's paper wrap and internal bonding strip are distinguishing features not found on Type MC.

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