LFMC and grounding

Status
Not open for further replies.
steve66

steve66

Senior Member
Location
Illinois
Occupation
Engineer
I am having a panel relocated, and the existing feeder is going to be extended. But the electricians discovered about 60' of Liquid Tight Flexible Metal Conduit (LFMC)in the feeder. The feeder is 3 phases, a neutral wire, and no ground wire.

I just wanted to verify that the LFMC doesn't provide the code required ground, and that the easiest way to fix this is to pull out the conductors and pull them back into the LFMC with a ground wire.

I think the ground is required to be inside the raceway with the feeder conductors, right? They can't just run a ground wire on the outside of the LFMC?

Thanks for the help:
Steve
 
Re: LFMC and grounding

Steve

250.118(7) is the relevant section for using LFMC as the EGC, the short answer is not more than 6' of LFMC can be in the grounding path.


300.3(B) requires the EGC to be in the same raceway as the circuit conductors.

IMO the LFMC can not be the EGC and the EGC you add must be within the raceway.
 
Re: LFMC and grounding

I believe 250.118(7)c won't allow the LFMC over 6' to be your egc. 250.102(E) also won't allow the bonding jumper to be over 6' outside a raceway. If I'm reading it right. Hope this helps. Ron
 
Re: LFMC and grounding

I'd like to work beside the original question.I believe it has been answered already.

300.3 (B) seems to lack the performance standards for routing EGC as listed in 250.120(C).

Is the conductor in the original post serving as a Bonding Conductor (250.102) or an EGC (250.120). The NEC needs to clear this up!.

What size is the feeder in question? 200A , larger , or smaller. What size conductor is required to provide (bond ground pick one ) the remote panel.??

This is a good question?

Yes / NO

charlie
 
Status
Not open for further replies.
Top