Re: Old 40C breaker -- IAEI-Michigan

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Date Posted: 09:06 07/04/08 Fri
Author: George Little
Subject: Re: Old 40C breaker
In reply to: Howard Soli 's message, "Old 40C breaker" on 21:08 06/29/08 Sun

>Does anybody know where a guy would find wire ampacity
>info to match up with an old 40C breaker?
I think you will find that the 40C rating on the breaker is the maximum ambient temperature for which that this breaker is designed. The terminals are probably 75C as that is the default rating, unless marked otherwise. Got that information out of the UL Marking Guide for molded case circuit breakers.

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>>Does anybody know where a guy would find wire ampacity >>info to match up with an old 40C breaker? >I think you will find that the 40C rating on the >breaker is the maximum ambient temperature for which >that this breaker is designed. The terminals are >probably 75C as that is the default rating, unless >marked otherwise. Got that information out of the UL >Marking Guide for molded case circuit breakers.

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