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Old 05-12-2013, 03:48 PM   #1
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Default #2 SER on 75amp OCPD ?

Had a "new" inspector last week. He said i had to put a 75amp or less breaker on my #2 SER feeder because he couldnt identify the lug temp rating?? Is he right?
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Old 05-12-2013, 03:59 PM   #2
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Had a "new" inspector last week. He said i had to put a 75amp or less breaker on my #2 SER feeder because he couldnt identify the lug temp rating?? Is he right?
You know he is correct -- 110.14(C). I have never seen anyone get called on that. I don't know when the lugs became 75C but it seems like if the rating is 60C I begin to wonder if alum is even allowed on those lugs-- is there a rating for that.
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Old 05-12-2013, 04:03 PM   #3
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You know he is correct -- 110.14(C). I have never seen anyone get called on that. I don't know when the lugs became 75C but it seems like if the rating is 60C I begin to wonder if alum is even allowed on those lugs-- is there a rating for that.
Here is type i had in but a 90amp. I could just throw a 60 on til he leaves i guess. No markings for lug temp at all
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Old 05-12-2013, 04:15 PM   #4
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I was thinking main lugs on a panel-- yeah throw in a new breaker and you should be good.
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Old 05-12-2013, 06:23 PM   #5
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Old 05-13-2013, 12:33 AM   #6
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Ive been called out on it before but 75*C is ok for your breaker. Now code wise its a gray area whether you use the 60 or 75* column in the NEC.
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Old 05-13-2013, 01:36 AM   #7
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Ive been called out on it before but 75*C is ok for your breaker. Now code wise its a gray area whether you use the 60 or 75* column in the NEC.
Pretty good percentage of the breakers I have ran into most are dual rated ( 60/75C ) so it will work but a gotcha is the rest of conductor that will fall either 60 or 75 C depending on how it ran.

SE and SER cable do come in two ratings so that part will have to be little more carefull with it.

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Old 05-13-2013, 07:31 AM   #8
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There is more to the breaker selection for #2al ser and most installations I see are wrong. What code cycle are you on?
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Old 05-13-2013, 10:10 AM   #9
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There is more to the breaker selection for #2al ser and most installations I see are wrong. What code cycle are you on?
I use whichever one benefits me at the time....doesn't the 11 allow se on the 75 column?
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Old 05-13-2013, 10:13 AM   #10
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I use whichever one benefits me at the time....doesn't the 11 allow se on the 75 column?
Yes, as long as it's not in contact with insulation.

AFAIK, it was only during the 2008 cycle that you had to use the 60 degree column.
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