grounding bushings

[john2mcc]

if you install 120v multiconductor cable in conduit stubbed up to cable tray feeding space heater ckt's in swgr and there is no ground in the cable will grounding bushings be required?

 

[john2mcc]

grounding bushings

how do you size the ground on your grounding bushings to the cable tray on parrallel feeds from switchgear to mcc?

 

[hurk27]

if you install 120v multiconductor cable in conduit stubbed up to cable tray feeding space heater ckt's in swgr and there is no ground in the cable will grounding bushings be required?

250.96(A) allows the raceway and the fittings to be the bonding means.

I would say IMO no your don't need bonding bushings. but there are inspectors who might see different.:roll:

 

[raider1]

Take a look at 250.102(D).

Chris

 

[tom baker]

The cable tray clamp must be listed for grounding for the RMC to the heater to be used as an EGC.