Reesh14
Electrical
- Aug 3, 2005
- 38
I am having trouble understanding a situation I saw in field with a 240V Panelboard. A 100A,120/208v. 3phase panel has a 90A/3P circuit breaker labeled "240V panel transformer". A 1" conduit from the bottom of this panel feeds a Square D load center panel through two-2kva, single phase ACME transformers. There is another 3/4" conduit from the top of the 120/208V panel also going into the load center panel.
The load center currently feeds a hot water heater with a 30A/2P breaker, a sewage sump pump with a 20A/2P breaker, and two 20A/2P breakers serving 220V Receptacles (which will be taken out).
I am not sure why there are two feeders going to the "240V panel" and if it even really is 240V. I am not sure if the panel is 2 wire or 3 wire or even the phase.
I am supposed to replace the wire and conduit between the 120/208V panel and the "240V panel", but I do not know what the existing wire sizes are so I am not sure how to size the new wires and conduit.
The two feeds, the 90A/3P feed breaker, the two transformers , and the whole situation just does not make sense to me. Could the feed with the two transformers only be feeding some of the breakers in the panel?
Any help/advise would be appreciated. Thanks!
The load center currently feeds a hot water heater with a 30A/2P breaker, a sewage sump pump with a 20A/2P breaker, and two 20A/2P breakers serving 220V Receptacles (which will be taken out).
I am not sure why there are two feeders going to the "240V panel" and if it even really is 240V. I am not sure if the panel is 2 wire or 3 wire or even the phase.
I am supposed to replace the wire and conduit between the 120/208V panel and the "240V panel", but I do not know what the existing wire sizes are so I am not sure how to size the new wires and conduit.
The two feeds, the 90A/3P feed breaker, the two transformers , and the whole situation just does not make sense to me. Could the feed with the two transformers only be feeding some of the breakers in the panel?
Any help/advise would be appreciated. Thanks!