60A Subpanel Questions

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JFletcher

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Williamsburg, VA
Are we allowed to run 6/3 UF (or NM) to a subpanel with a 60A main OCPD? I know there is no 55A breaker; are we allowed to go to the next largest OCPD, or do we have to go with a 50A breaker or #4 wire?
 
JFletcher said:
Are we allowed to run 6/3 UF (or NM) to a subpanel with a 60A main OCPD? I know there is no 55A breaker; are we allowed to go to the next largest OCPD, or do we have to go with a 50A breaker or #4 wire?
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A #4 wire with a 60A OCPD is good.
 
If you calculate the load and its 55 amps or less you can use the #6 on a 60 amp. Otherwise its a #4
 
I agree with gus-- 240.4(B) allows us to use the next size breaker if the load doesn't exceed the value of the conductor
 
JFletcher said:
Are we allowed to run 6/3 UF (or NM) to a subpanel with a 60A main OCPD? I know there is no 55A breaker; are we allowed to go to the next largest OCPD, or do we have to go with a 50A breaker or #4 wire?
Click to expand...
Assuming it is supplied by a feeder, not a tap, the OCPD main can be darn near anything ... 60, 100, 125, 200 ...

The feeder must be protected at its source in accordance with the code.
 
I put them on 60's all the time with #6 NM or UF cable. No issues that I'm aware of since the load is rarely even close to that in a resi setting.
 
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