Potentially undersized conductor

[bluemarinoni]

I recently had an electrical contractor through who installed a new QO panel. Due to the antiquated nature of the main panel feeding the new panel, the OCPD is a 100 amp E-frame Westinghouse unit, and I cannot see any temp rating on the unit.

As I understand it, if no temp rating is evident, the conductor gauge must be specified from the 60deg column of table 310.16. He installed a #1 aluminum conductor, which is only good for 85amps at 60deg C, and as such is undersized for the application.

Before I politely ask about his choice of conductor here, I wanted to ask if anyone had any experience with the old Westinghouse OCPD's and if there was any potential that they were good to 75deg C?

Best,

 

[Dennis Alwon]

You should talk to your electrician because he is correct with the wire sizing. The NEC allows for 83% reduction for services for dwelling units. 100 x 83% is 83 amps- #1 is good for 85 amps at 60C

 

[kwired]

You should talk to your electrician because he is correct with the wire sizing. The NEC allows for 83% reduction for services for dwelling units. 100 x 83% is 83 amps- #1 is good for 85 amps at 60C

Was not clear if this is the supply to a dwelling unit, if it is then that is fine.

 

[bluemarinoni]

Was not clear if this is the supply to a dwelling unit, if it is then that is fine.

This is an industrial installation.