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#5871 - 12/12/01 12:49 PM temperature ratings
dom Offline
Junior Member

Registered: 06/29/01
Posts: 8
What does the dual rating listed on circuit breakers mean? (60/75) Is it just indicating a range of wire sizes that will legally fit into the terminal, or is there more to it?
If there is a choice, most people would probably choose to use the 75 deg rating.
thank you

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#5872 - 12/12/01 08:54 PM Re: temperature ratings
Jim M Offline

Registered: 08/10/01
Posts: 453
Loc: Chestertown, MD, USA
This should indicate that the terminal is listed for use at either temperature ampacity. If the teminal was only listed for use with a 60 degree termination it would affect the wire size you could use to achieve the required ampacity. See Section 310-10 and the associated Tables to see the affect of the different ampacities in the different temperature columms.


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