Overcurrent sizing for NM

[TimNY]

Given a subpanel fed with 6-3 NM, what is the proper overcurrent device size?

Code says ampacity of NM to be based on 60C.

60C says 55A for #6.

Inspector says must be protected at 50A.

Contractor asks me to look.

Seems to me it is allowed to be protected at 60A per E3605.5.2?

Thanks,

Tim

 

[raider1]

Given a subpanel fed with 6-3 NM, what is the proper overcurrent device size?Code says ampacity of NM to be based on 60C.

60C says 55A for #6.

Inspector says must be protected at 50A.

Contractor asks me to look.

Seems to me it is allowed to be protected at 60A per E3605.5.2?

Thanks,

Tim

I agree with you Tim, the next size up rule is permitted to be used in this situation since 55 amps is not a standard circuit breaker size.

Keep in mind that the calculated load of the panel could not exceed 55 amps though.

Chris

 

[TimNY]

Thanks for your help, Chris.

Tim

 

[raider1]

Your very welcome.

Chris