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#41635 - 09/02/04 11:26 PM Zinsco 40*C Breaker  
PEdoubleNIZZLE  Offline
Member
Joined: Jun 2004
Posts: 176
McKeesport, PA, USA
I have an old Zinsco panel in my house with type Q breakers (not for long, will be replaced with a Murray 200A panel). [Linked Image] It was there when I moved it, it has a 100A, then a 100A Breaker going to a sub panel. The one going to the sub says 40 degrees C. Table 310.16 only goes down to 60C. I'm just wondering what size copper wire would be used on 100A 40*C. The breaker has #2 SE cable with a #4 Neutral connected to it, which I know is illegal because 310.15 doesn't apply here. [Linked Image]
P.S. Sorry if I used some incorrect terms, I'm an engineering student, not an electrician.
Thanks!


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#41636 - 09/03/04 02:18 AM Re: Zinsco 40*C Breaker  
caselec  Offline
Member
Joined: Apr 2002
Posts: 558
San Jose, CA
40C is the ambient temperature (average enclosure temperature) the breaker is calibrated for.


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