100 amp sub panel

Originally Posted By: rholland
This post was automatically imported from our archived forum.



I recently rode along on an inspection of a townhouse.


The service panel was 100 amp,it was a full panel about 20 breakers.


Three breakers down on the left side of the panel was a 100 amp


double pull breaker to a sub panel in the basement. The basement


sub panel was full about 20 breakers. We couldn’t take the front


off the upstairs panel it was framed into the wall.


My question is this 100 amp service panel overloaded what


exactly were we looking at? I know most sub panels are feed


with 30 amp feeder if the service panel has capacity.


It seems if you figured volts divided into watts this system


it would be over 100 amps.The townhouse had an elevator.


What were we seeing here? Has anyone else seen this situation?


Rick H


Originally Posted By: jpope
This post was automatically imported from our archived forum.



rholland wrote:
I know most sub panels are feed with 30 amp feeder if the service panel has capacity.


Load side panels (sub panels) are not "usually" fed by any specific size feeder and/or breaker, however, the feeder cables must be properly sized for the breaker supplying the panel (100 amp breaker = 2 awg CU or 1/0 AL feeders).


--
Jeff Pope
JPI Home Inspection Service
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