FMC

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rwayne

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What is the maximum length of FMC for fixture whips with ground. All I can find in the NEC is 6' but I have been told it can be greater if you use an equipment ground in the FMC.

Thanks for your help,
Wayne
 
Re: FMC

The restriction in 250.118 is for using the outer sheath as the ground fault return path. Longer than 6 ft needs an equipment grounding conductor.

Why not use MC or AC, it would be easier than pulling thru FMC?
 
Re: FMC

Mr Baker,
I asked the same question about useing MC but the contractor choose to use greenfield. We have two different jobs going and one contractror is going by the 6' ruleing in 348.30 excpt no.3. In the handbook article 348.60 has an example that shows this and not jumping from fixture to fixture.
The other contractor has runs of greenfield that vary from 6' to 12' and jump from fixture to fixture. Both are pulling an equipment ground. I have seen this done many times but I'm not sure whether or not is a code violation. I appreciate you response.
Thanks,
Wayne
 
Re: FMC

Hi Wayne,

FMC can be installed at any length. When it is, it needs to be secured and supported within 12" of each termination AND every 4 1/2 feet.

If used to wire lighting in a drop ceiling, the FMC may not be secured to the same support wires that support the ceiling. They need their own support wires!

When the length does not exceed 6' from a junction box to a lighting fixture only, no securing is required.
When run from fixture to fixture, regardless of length, it is required to be secured.
 
Re: FMC

Good one russ,FMC is couduit whips are whips but 6 ft is max on 3/8
 
Re: FMC

Thanks for all the help guys!

Maybe I'll be able to stop asking "stupid" questions one of these days.

Wayne
 
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