Ground Bushing and EMT termination at Panel question

[Samh]

Trying to determine if ground bushings are needed at the panel, and seems like I am seeing conflicting info. So all circuits run in EMT that terminate at the main panel. Two of the runs go into concentric knockouts where the there are still a few rings left. One, uses the entire knockout. All circuits are 120V, but one run has multiple multiple circuits in it. And since I am having trouble finding them locally for the size conduit I have, is running a ground wire from the ground in the panel to the first box acceptable?

Thanks in advance.

 

[u2slow]

I don't know what NEC says (not my code)....

Standard trade practice for me on branch circuits has been no bushings for cast aluminum connectors. Steel connector is either insulated (plastic-throat) or gets a bushing. Run the bond/EGC wire if/when you don't trust the EMT to do it.

 

[wyliesdiesels]

Trying to determine if ground bushings are needed at the panel, and seems like I am seeing conflicting info. So all circuits run in EMT that terminate at the main panel. Two of the runs go into concentric knockouts where the there are still a few rings left. One, uses the entire knockout. All circuits are 120V, but one run has multiple multiple circuits in it. And since I am having trouble finding them locally for the size conduit I have, is running a ground wire from the ground in the panel to the first box acceptable?

Thanks in advance.

yes you can run an EGC in the EMT but its not necessary if the EMT is complete end to end

 

[grounded-b]

Trying to determine if ground bushings are needed at the panel, and seems like I am seeing conflicting info. So all circuits run in EMT that terminate at the main panel. Two of the runs go into concentric knockouts where the there are still a few rings left. One, uses the entire knockout. All circuits are 120V, but one run has multiple multiple circuits in it. And since I am having trouble finding them locally for the size conduit I have, is running a ground wire from the ground in the panel to the first box acceptable?

Thanks in advance.

Bonding bushings are not required for branch circuits, unless you are entering a concentric knockout with rings remaining AND the voltage to ground is over 250V. per NEC 250-97. As a side note, they would be required if you were using metallic raceway and entering a non-metallic enclosure.

A means to ensure electrical ground continuity at service equipment, service raceways and service equipment shall be made by threaded hubs, threadless fittings if made up tight, OR other listed devices such as bonding locknuts, bonding bushings, or bushings with bonding jumpers. per NEC 250-90(B) Note: this does not apply to branch circuit or feeder raceways, only the service entrance raceway. This applies at any voltage.

Steve

 

[Pingel85]

The way I read it, you are just trying to bring your branch circuits into the panel through emt. Then no you don’t need bushings unless the wire is 4 or larger. I’m also guessing residential so you won’t be over 250 to ground as grounded-b said. Your emt is good for grounding bond, but personally I always run a ground wire. Cheap insurance to maintain a path for fault current.

 

[Samh]

Bonding bushings are not required for branch circuits, unless you are entering a concentric knockout with rings remaining AND the voltage to ground is over 250V. per NEC 250-97. As a side note, they would be required if you were using metallic raceway and entering a non-metallic enclosure.

A means to ensure electrical ground continuity at service equipment, service raceways and service equipment shall be made by threaded hubs, threadless fittings if made up tight, OR other listed devices such as bonding locknuts, bonding bushings, or bushings with bonding jumpers. per NEC 250-90(B) Note: this does not apply to branch circuit or feeder raceways, only the service entrance raceway. This applies at any voltage.

Steve

Thanks. the AND was the part that wasn't clearly spelled out in everything I read, and just kept seeing about if there are rings left in a concentric knockout.