service lateral size

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Old 08-26-05, 10:07 AM
pden
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Question service lateral size

My underground service cable is type USF 1/0....is this large enough to supply a 150 amp main breaker panel, or do I have to stay with the 125 amp panel I have now? I should add that the distance to the transformer is about 70 feet.
 

Last edited by pden; 08-26-05 at 10:33 AM.
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Old 08-26-05, 10:51 AM
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Originally Posted by pden
My underground service cable is type USF 1/0....is this large enough to supply a 150 amp main breaker panel, or do I have to stay with the 125 amp panel I have now? I should add that the distance to the transformer is about 70 feet.
I suspect this underground service feeder is aluminum wire and was sized using NEC table 310.15(b)(6) which would limit it to 125 amps.

If it is copper USF 1/0 then it would be good for 175 amps.
 
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Old 08-26-05, 10:55 AM
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There are different ampacities for Coppper and Aluminum conductors.

Can you indenify the type of conductor in terms of the metal?
 
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Old 08-26-05, 11:26 AM
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As many have stated it really depends on the type of conductor being run...AL or CU.....you can deteremine that by viewing the connections in your panel...HOWEVER work in a panel with caution and always be aware of what you are doing............

The 70 feet is not uncommon....

The largest factor is going to be the type of wire feeding your panel which I am with roger in that chances are it is AL wire.....certainly woudl be today with the latest cost of copper....
 
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