Anti shorts and FMC

[mark32]

A co-worker commented that anti shorts must be used on FMC, which I promptly disagreed with. Aside from never seeing anyone use them w/flex, I grabbed my code book and pointed out to him that there is no mention of any abrasion protection required. Aside from that, does anyone here use anti shorts with FMC?

 

[Volta]

A co-worker commented that anti shorts must be used on FMC, which I promptly disagreed with. Aside from never seeing anyone use them w/flex, I grabbed my code book and pointed out to him that there is no mention of any abrasion protection required. Aside from that, does anyone here use anti shorts with FMC?

You're right, no bushings required, but does need some abrasion protection in the form of trimming or filed or an internal connector.
Don't use anti-shorts for that myself except for oh so rarely.

 

[stew]

I dont use asb for this but never ever use mc cable without a bush.

 

[radiopet]

I dont use asb for this but never ever use mc cable without a bush.

I think you mean AC Cable and not MC Cable.

320.40 Boxes and Fittings. At all points where the armor
of AC cable terminates, a fitting shall be provided to protect
wires from abrasion, unless the design of the outlet boxes
or fittings is such as to afford equivalent protection, and, in
addition, an insulating bushing or its equivalent protection
shall be provided between the conductors and the armor.
The connector or clamp by which the Type AC cable is
fastened to boxes or cabinets shall be of such design that
the insulating bushing or its equivalent will be visible for
inspection. Where change is made from Type AC cable to
other cable or raceway wiring methods, a box, fitting, or
conduit body shall be installed at junction points as required
in 300.15.

 

[Volta]

I dont use asb for this but never ever use mc cable without a bush.

Me either, for good practice. Nor, of course, AC, for both good practice and code.

 

[LarryFine]

I do use bushings with FMC and AC (the latter of which I don't use, but often find in existing work and occasionally reuse in the same job), but not with MC.

I do commercial-kitchen fire-suppression wiring, and I use bushings in the 1/2" FMC I use for the six conductors from the micro's in the head to the J-box on the wall.

I also use bushings for the solenoid gas valve when there's gas, and I use pieces of MC sheath stripped ends as 3/8" AC, and they always get bushings, too.

 

[mark32]

Thanks for the replies, since Larry uses them I may have to utilize them in the future While were on the topic of FMC, I DO NOT like using those squeeze type connectors. I much prefer using the type with the slanted plate and set screw thingy, just had to get that off my chest.

 

[busman]

Tite-bite's are great but really pricey.

 

[buddhakii]

I was taught long ago that if you terminate flex into a squeeze tight conn. that is concealed you should tie wire around the flex and box to hold them together, and in case the flex pulls out of the conn. you can still get to it with the tie wire.

 

[daleuger]

Thanks for the replies, since Larry uses them I may have to utilize them in the future While were on the topic of FMC, I DO NOT like using those squeeze type connectors. I much prefer using the type with the slanted plate and set screw thingy, just had to get that off my chest.

Even worse than that is snap on MC connectors. Sure, slightly time saving as opposed to turning a set screw, but I have seen a good number of these knick the wire and make a nice little fireworks display when you hit power. Before, you say "faulty operator" it's happened to VERY experienced wiremen.