In this episode we talk in-depth about how to wire with MC cable, what the uses permitted and uses NOT permitted are, as well as securing and strapping and a whole host of other tips for use.
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MC vs AC
First off I suppose it’s good to point out the difference between AC and MC. A lot of people think that it’s the jacketing that separates the two, but actually, both come in steel and aluminum jacketing. Really it’s what’s inside that sets the two apart.
MC cable typically has either an insulated or bare FULL-SIZED equipment grounding conductor inside of it – or sometimes both depending on the purpose of the MC. AC has a small #16AWG equipment grounding conductor in it. The codes in the 2017 NEC have variations in them between MC and AC on things such as bushings as well as the bonding conductor requirements, that is all to say, they are not the same thing. Think Metallica and Megadeth or Audioslave and Soundgarden. Essentially the same…but different.
USES PERMITTED AND NOT PERMITTED
There are a lot more uses both permitted and not permitted in Article 330 covering MC cable than what I mention in the above video. But here are they are in totality (2017 NEC)
330.10 Uses Permitted.
330.10(A) General Uses.
Type MC cable shall be permitted as follows:
330.10(A)(1) For services, feeders, and branch circuits.
330.10(A)(2) For power, lighting, control, and signal circuits.
330.10(A)(3) Indoors or outdoors.
330.10(A)(4) Exposed or concealed.
330.10(A)(5) To be direct buried where identified for such use.
330.10(A)(6) In cable tray where identified for such use.
(((CONTINUED IN ARTICLE…..)))
330.12 Uses Not Permitted
Type MC cable shall not be used under either of the following conditions:
330.12(1) Where subject to physical damage
330.12(2) Where exposed to any of the destructive corrosive conditions in (a) or (b), unless the metallic sheath or armor is resistant to the conditions or is protected by material resistant to the conditions:
(a) Direct buried in the earth or embedded in concrete unless identified for direct burial
(b) Exposed to cinder fills, strong chlorides, caustic alkalis, or vapors of chlorine or of hydrochloric acids
330.30 Securing and Supporting
Type MC cable shall be supported and secured by staples; cable ties listed and identified for securement and support; straps, hangers, or similar fittings; or other approved means designed and installed so as not to damage the cable.
Unless otherwise provided, cables shall be secured at intervals not exceeding 1.8 m (6 ft). Cables containing four or fewer conductors sized no larger than 10 AWG shall be secured within 300 mm (12 in.) of every box, cabinet, fitting, or other cable termination. In vertical installations, listed cables with ungrounded conductors 250 kcmil and larger shall be permitted to be secured at intervals not exceeding 3 m (10 ft).
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#mccable #electrical #conductors
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