Armored Cable (AC Cable)

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Armored Cable (AC Cable)

What is Armored Cable (AC Cable)?

Armored Cable, A flexible electrical cable with an interlocking metal sheath providing mechanical and fire protection.

Description

Armored Cable, commonly called AC cable or BX, consists of insulated conductors wrapped in a spiral‑wound steel or aluminum armor. The metal sheathing protects against physical damage and, when properly bonded, serves as an equipment grounding conductor. AC cable is widely used in commercial renovations where conduit is impractical. NEC Article 320 governs installation, including securing, bending radius, and bushings at terminations.

FAQs

  • What is the difference between AC and MC cable?

    MC includes a separate full-size grounding conductor; AC relies on bonding strip and armor.

  • Where is armored cable allowed?

    Concealed walls, above suspended ceilings, and dry locations per code.

  • Can AC cable be used outdoors?

    No, it is rated for dry interiors only.

  • How is AC cable cut?

    With rotary armor cutters that prevent nicking conductors.

  • Are anti-short bushings required?

    Yes, to protect insulation from sharp armor edges.

  • Who installs armored cable?

    Licensed electricians following NEC Article 320 requirements.

  • Is BX cable still legal?

    Yes, modern AC cable meets current UL standards.

Fun Fact

Fun Fact: The nickname “BX” originated from the product code of early 1900s Bergman cable, the first armored wiring sold by General Electric.

CSI Code

26 05 19

NAHB Code

2600