N-G bond

B

Beckonweb

Member
Location
Yuma AZ
Occupation
Electrician
From a 200A main breaker in a service panel, we are feeding a 200A load breaker in a backup loads panel, then running it back to feed the original bus with all of the load breakers. Will this affect the N-G bond in the main service panel?
 
Beckonweb said:
From a 200A main breaker in a service panel, we are feeding a 200A load breaker in a backup loads panel, then running it back to feed the original bus with all of the load breakers.
Click to expand...
I'm not sure I understand this can you elaborate? As Larry stated the MBJ goes in the same location as the service disconnect and nowhere else.
 
If I’m following this correctly, you are disconnecting the buss from the original main, feeding a new 200 amp panel, then returning from that panel to feed the existing buss? Is there a transferswitch somewhere involved in this?
 
In order to avoid moving all of the load breakers to the backup subpanel, we want to just install a 200A breaker in the subpanel and connect it to the top lugs on the main bus bar. Then loads will be powered by batteries during a power outage. We will remove the existing 3/0 conductors from the main breaker to the bus bar. Just concerned about the N-G bond.
 
hillbilly1 said:
If I’m following this correctly, you are disconnecting the buss from the original main, feeding a new 200 amp panel, then returning from that panel to feed the existing buss? Is there a transferswitch somewhere involved in this?
Click to expand...
Yes! Using a Tesla Gateway that has a power control system (PCS). In this case the utility would not let us put a Tesla Backup Switch (meter collar) behind their meter because it is a 400A service with two 200A mains. So we installed a customer-owned meter socket on the second 200A breaker and put the Back Up Switch there. This now requires a backup loads panel in order to control the loads during an outage. Seems easier to just install a 200A load breaker in the backup panel and wire to bus lugs than to move all of those breakers to the backup panel. Just concerned about the N-G bond and whether it will still protect all of those load breakers.
 
The old panel would now become a sub panel, which complicates things, the service neutral bond would remain there, but the neutrals and grounds would need to be separated for those circuits. The neutrals can’t go on the bonded neutral bar, unless it is unbonded, and a separate lug for the service neutral that is bonded and then fed through to the new main along with a separate egc. It may be easier (or less complicated) to just delete the old panel, and route the circuits to the new panel.
 
So, the service conductors pass through the first panel and land on the 200 amp breaker in the downstream panel?
 
hillbilly1 said:
The old panel would now become a sub panel, which complicates things, the service neutral bond would remain there, but the neutrals and grounds would need to be separated for those circuits. The neutrals can’t go on the bonded neutral bar, unless it is unbonded, and a separate lug for the service neutral that is bonded and then fed through to the new main along with a separate egc. It may be easier (or less complicated) to just delete the old panel, and route the circuits to the new panel.
Click to expand...
It is still the main entry point from the utility and needs N-G bond. Goes from main breaker to customer meter socket to utility disconnect to gateway to backup loads panel. Could we install a neutral bar and ground bar that goes back to the backup loads panel with no N-G bond?
 
The utility meter and main breakers in the service panel will not be moved. They are the nearest point of entry. We just want to use the bus bar without removing it from the panel. Could we run the N and G from breakers back to the subpanel from which they are powered?
 
You must log in or register to reply here.
Top