Hello everyone:
I have a 4/0 ground ring conductor that needs to be bonded with 4/0 to Main ground bar within the electrical room. The documents calls for 3/4"C PVC underground then transition to steel conduit once it turns up. The electrician has indicated they can't get ground bushing that allow connection of 4/0 copper wire to a 3/4" conduit. If we can go with PVC conduit then this will eliminate the bushing requirement but prefer to stick with steel for physical protection. other thought is to increase the conduit size to 2.5" to accomedate the 4/0 but I prefer not to do it. also, doe the bonding conductor needs to be 4/0 or can be reduced to 2/0? (per 250.66-C: the bonding conductor does not have to be larger than the ground ring). Any thoughts....
I have a 4/0 ground ring conductor that needs to be bonded with 4/0 to Main ground bar within the electrical room. The documents calls for 3/4"C PVC underground then transition to steel conduit once it turns up. The electrician has indicated they can't get ground bushing that allow connection of 4/0 copper wire to a 3/4" conduit. If we can go with PVC conduit then this will eliminate the bushing requirement but prefer to stick with steel for physical protection. other thought is to increase the conduit size to 2.5" to accomedate the 4/0 but I prefer not to do it. also, doe the bonding conductor needs to be 4/0 or can be reduced to 2/0? (per 250.66-C: the bonding conductor does not have to be larger than the ground ring). Any thoughts....