What is my service entrance rated for?

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Old 01-12-18, 11:09 AM
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What is my service entrance rated for?

It is an underground entrance with two 1/0 hot leads and a #2 neutral. The charts I have seen read the 1/0 is rated 175 amps but the #2 is only 125 amps. So with the neutral being smaller does that mean the entrance is only rated for 125 amps?

skeeter
 
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Old 01-12-18, 11:20 AM
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When discussing poco service cables things are a little different. They don't follow the NEC code the same as we do.

However, cables run thru a conduit are limited in ampacity.
More than likely your service cables are aluminum. 1/0 is 135A max.
 
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Old 01-12-18, 11:32 AM
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Sorry accidently posted on wrong forum. Can a moderator move it to Electrical AC-DC forum?
 
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Old 01-12-18, 11:36 AM
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PJmax, you are correct. I did not catch that they are aluminum cables. So the amperage capacity of the panel would be 125amps?

skeeter
 
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Old 01-12-18, 11:50 AM
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Correct and thread moved to electrical.
 
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Old 01-12-18, 11:59 AM
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The neutral is allowed to be sized smaller than the ungrounded hot conductors. The service size is not based on the neutral size.
 
 

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