grounding

[romex jockey101]

if your feeding a subpanel with emt or rigid conduit from the mainpanel do you have to feed a groundingconductor aswell even tho it will be bonded to the mainpanel through the conduit ...and if you dont have to bring a ground what would happen if their was a groundfault in the subpanel would the fault then go through the conduit to the mainpanel and then to the gec.

 

[infinity]

You are required to bring an EGC to the subpanel. EMT or RMC both qualify as an EGC so an additional wire type EGC is not required. The fault current in the sub would flow on the conduit back to the system bonding jumper in the service.

 

[jumper]

if your feeding a subpanel with emt or rigid conduit from the mainpanel do you have to feed a groundingconductor aswell even tho it will be bonded to the mainpanel through the conduit ...and if you dont have to bring a ground what would happen if their was a groundfault in the subpanel would the fault then go through the conduit to the mainpanel and then to the gec.

Gecs and electrodes are not for clearing ground faults. A ground fault in a circuit using a EMT, RMC, or other approved EGCs will trip an OCPD/breaker.