Wiring With MC – WHAT YOU CAN AND CAN'T DO WITH MC CABLE as an electrician

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.

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.

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

330.30(A) General.

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.

330.30(B) Securing.

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).

CONTINUE READING FULL ARTICLE @ https://www.electricianu.com/podcast/episode-37-wiring-with-mc-what-you-can-and-cant-do-with-mc-cable

#mccable #electrical #conductors

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20 thoughts on “Wiring With MC – WHAT YOU CAN AND CAN'T DO WITH MC CABLE as an electrician

  1. Windy City Wire is the best. There Box’s of MC have rollers in them and you can get how ever many feet you want, super easy to just pull out and do clean runs

  2. We will commonly sheath a length of mc in pvc if the run needs to go through a building but land in and outdoor box. I’m using the mc type with thwn-2 conductors and a plastic wrapping under the armor. It’s not in a wet location. Do you think this is a code violation

  3. Can I use MC cable (10/3) for a 220v dryer outlet install, ran across a cinder block wall in the basement? I don't want to bend conduit if I don't have to…

  4. If you don't use those red devils that's just being lazy and I like to add a little tape around the sheathing to keep from cutting some body.

  5. I've been an electrician for 11 years the question still remains! How do you properly unspool MC so the ridges face the correct way when ur pulling? I work alone 99% of the time and I always hated pulling MC! Please tell me there something I've been doing wrong! Lol

  6. Every inspector I've run into in Michigan is looking for that little tab on the anti short bushing, & if he can't see it, He's gonna want to see it.

  7. I've been doing electrical work for 45 years. This guy is absolutely awesome. He's knowledgeable and a real person at the same time. Make sure you follow him if you want to learn the correct way and you're interested in code.

  8. I am an electrical contractor with 35 yrs experience from heavy duty industrial to high end residential and I always like to listen to dustins videos because there’s always something to learn that you thought you knew but actually didn’t. Your never to old to learn a trick of the trade or somebody’s particular style of doing something that can benefit you or your company and save time and possibly may even be a safer way of performing a task. Great job Dustin!

  9. You are showing MC going through steel studs without Grommets, we are not allowed to run it through steel studs without using plastic grommets and we can't use tie wire, have to use non metallic ties like zip ties.

    We also can't have more than 360 degree's total bends in MC, so when they are sloppy rolling it out they can get red tagged if they don't run it properly.

    We get red tagged if we don't use the red devils.

    Common sense ain't so common, especially on a jobsite or with inspectors.

  10. Are the one-hole straps used in this video (https://youtu.be/6sZyqikMsgw?t=442) specific to MC or would they also be rated for use with EMT? I'm having difficulty tracking down straps that look to be the correct size to support 14/2 MC. I see one-hole 1/2" EMT straps that look similar at Lowe's, but they seem to be way too large.

    I didn't see anything like these (https://www.homedepot.com/p/BRIDGEPORT-14-2-to-10-3-Mighty-Hold-Universal-Steel-1-Hole-MC-Straps-100-Pack-US-4461/314707544), which look to be the obvious choice.

  11. At 4:30 pay of the video. You said MC cable can be used in an exposed location outside of and on top of drywall.

    Could I get the code reference for this type of installation? A local inspector not in my usual city said MC cannot be used in an exposed location. I have for years used MC in an exposed locations.

  12. So in a commercial application a person could plan to use EMT to the panel and MC for everything else?

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