Equipment grounding conductor

T

Therealcrt

Senior Member
Location
Kansas City
Occupation
Electrician
Changing out old panels and an old three-story apartment complex. The feeder conduit is rigid, and they were using the raceway as an equipment grounding conductor when installed in the new panel that had concentric knockouts are bonding bushings required, even if it’s not the first means of disconnect.? Also we had to cut the rigid on the second floor that fed the third floor panel and had to convert to an inch and a quarter flex to re-feed the third floor panel because it was in the way when mounting the second floor panel. When transitioning to flex is that acceptable to still be used as an equipment grounding conductor.?
 
Therealcrt said:
Changing out old panels and an old three-story apartment complex. The feeder conduit is rigid, and they were using the raceway as an equipment grounding conductor when installed in the new panel that had concentric knockouts are bonding bushings required, even if it’s not the first means of disconnect.? Also we had to cut the rigid on the second floor that fed the third floor panel and had to convert to an inch and a quarter flex to re-feed the third floor panel because it was in the way when mounting the second floor panel. When transitioning to flex is that acceptable to still be used as an equipment grounding conductor.?
Click to expand...
Read 250.118(5) for using FMC as an EGC
 
Therealcrt said:
Changing out old panels and an old three-story apartment complex. The feeder conduit is rigid, and they were using the raceway as an equipment grounding conductor when installed in the new panel that had concentric knockouts are bonding bushings required, even if it’s not the first means of disconnect.? Also we had to cut the rigid on the second floor that fed the third floor panel and had to convert to an inch and a quarter flex to re-feed the third floor panel because it was in the way when mounting the second floor panel. When transitioning to flex is that acceptable to still be used as an equipment grounding conductor.?
Click to expand...
Bonding bushings are not required for the RMC. The FMC will require the installation of an EGC in the feeder.
 
wwhitney said:
A equipment bonding jumper run across the FMC, connecting both pieces of RMC, is another option, yes?

Cheers, Wayne
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Depends on the length. Since he mentioned that they cut it on another floor I'm assuming that is more than 6' but you're correct it could be installed on the outside if 6' or less.
 
infinity said:
Depends on the length. Since he mentioned that they cut it on another floor I'm assuming that is more than 6' but you're correct it could be installed on the outside if 6' or less.
Click to expand...
Thanks for the reminder that an EBJ outside the conduit is limited to 6' or less by 250.120(D)(2). Is there any way to install one inside just the FMC and connect to the ends of the RMC immediately adjacent to the FMC?

Cheers, Wayne
 
Ok so the FMC is indeed longer than 6 ft. The conductors obviously isn’t protected by 20a or less since it’s a panel feeder. So that’s out the window anyways. So you’re saying I would most likely need to terminate into a junction box and then run the FMC up to the panel with a green equipment grounding conductor within the raceway
 
Therealcrt said:
Ok so the FMC is indeed longer than 6 ft. The conductors obviously isn’t protected by 20a or less since it’s a panel feeder. So that’s out the window anyways. So you’re saying I would most likely need to terminate into a junction box and then run the FMC up to the panel with a green equipment grounding conductor within the raceway
Click to expand...
Yes that is one way to do it. Another way would be to re-pull the feeder and add the EGC.
 
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