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Service entrance conductors: one aluminum & one copper Service entrance conductors: one aluminum & one copper
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Old 04-28-2011, 09:09 AM   #1
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Default Service entrance conductors: one aluminum & one copper
Looked at a house and found a 4/0 aluminum entrance cable on one main panel lug and one 2/0 copper cable on the other. 200 amp breaker so, in theory that should be alright but can you mix like this?

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Old 04-28-2011, 09:14 AM   #2
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Looked at a house and found a 4/0 aluminum entrance cable on one main panel lug and one 2/0 copper cable on the other. 200 amp breaker so, in theory that should be alright but can you mix like this?
As long as it isn't parallel conductors it should be compliant.

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Old 04-28-2011, 10:13 AM   #3
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Default ??


Not sure what that means? Can you re-explain or is it just me?
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Old 04-28-2011, 10:16 AM   #4
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Not sure what that means? Can you re-explain or is it just me?
I am saying that you can mix aluminum conductor with copper conductors as service entrance or feeders. However if there is a parallel run that you must abide by 310.4(B). The conductors in this case must be the same material as well as other restrictions.
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Old 04-28-2011, 10:54 AM   #5
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Sorry, I meant the OP. I don't know exactly what the question is. 1 seu service cable with a 4/0 Al and a 2/0Cu in the one cable or 1 service cable with one conductor in one panel and one in another or something else?

Thanks for the code ref though..
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Old 04-28-2011, 11:14 AM   #6
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Sorry, I meant the OP. I don't know exactly what the question is. 1 seu service cable with a 4/0 Al and a 2/0Cu in the one cable or 1 service cable with one conductor in one panel and one in another or something else?

Thanks for the code ref though..
I think it is conduit with one copper conductor and one aluminum conductor. At least that is my take.
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Old 04-28-2011, 07:56 PM   #7
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I think it is conduit with one copper conductor and one aluminum conductor. At least that is my take.
Yes, that is correct. Thanks for your help. Guess they had a remnant to get rid of.
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Old 10-16-2011, 01:27 PM   #8
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don't any idea why someone would do that but guess i've seen worse but at least change the 2\0 cu to 3/0.

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