Rating of automatic transfer switch

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lfloyd

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On an optional standby system, can a 400amp transfer switch be used on a 600 amp service?
The normal and load feeders would be sized for 600 amps and the generator feeders would be rated for 400 and protected at the generator by a 400 amp breaker. It will transfer the entire service load.
The calculated load on the service is currently under 400 amps but has been sized for future loads.
Can this be done?
 
lfloyd said:
On an optional standby system, can a 400amp transfer switch be used on a 600 amp service?
The normal and load feeders would be sized for 600 amps and the generator feeders would be rated for 400 and protected at the generator by a 400 amp breaker. It will transfer the entire service load.
The calculated load on the service is currently under 400 amps but has been sized for future loads.
Can this be done?
Click to expand...
You'll need to put a 400 amp OCPD ahead of the switch. The ATS has to be sized for the circuit it is installed in.
 
lfloyd said:
On an optional standby system, can a 400amp transfer switch be used on a 600 amp service?
The normal and load feeders would be sized for 600 amps and the generator feeders would be rated for 400 and protected at the generator by a 400 amp breaker. It will transfer the entire service load.
The calculated load on the service is currently under 400 amps but has been sized for future loads.
Can this be done?
Click to expand...

best i know the answer is NO ...


if you are interupting the 600 amp service you need a 600 amp transfer switch ....
 
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