olly
Senior Member
- Location
- Berthoud, Colorado
- Occupation
- Master Electrician
I need to know what wire size to take up the service mast for a 150A service. I would like to use aluminum. I forgot my code book today. Thanks for your help!
I don't have my code book with me - wire size needed
- Thread starter olly
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LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
3/0 al
wwhitney
Senior Member
- Location
- Berkeley, CA
- Occupation
- Retired
Since you seem to have internet access:
From the 75C column, 2/0 Al is 135A, and 3/0 Al is 155A. So for a full 150A you need 3/0 Al; but as the next lower breaker size is 125A, if the calculated load is 135A or less, you can use 2/0 Al protected at 150A. That would give you a 135A service.
Cheers, Wayne
From the 75C column, 2/0 Al is 135A, and 3/0 Al is 155A. So for a full 150A you need 3/0 Al; but as the next lower breaker size is 125A, if the calculated load is 135A or less, you can use 2/0 Al protected at 150A. That would give you a 135A service.
Cheers, Wayne
olly
Senior Member
- Location
- Berthoud, Colorado
- Occupation
- Master Electrician
Can I reduce the size of my neutral wire? Thanks for the answer Wayne!
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Yes, sized to the maximum L-N load or (if I'm not mistaken) the minimum GEC size, whichever is larger.
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