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Mike G.
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Iam hooking up new 100 amp service what wire size do I use

Customer Question

Ia'm hooking up new 100 amp service what wire size do I use for weather head to breaker box -Contra Costa County California
Submitted: 1 year ago.
Category: Electrical
Expert:  Electric Pro replied 1 year ago.
Hello and thank you for using this service,


The wire size would be #2 AWG copper for the hots and #4 AWG copper for the neutrals. You should contact the electric company to do the hookup as they should be doing that for you.
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Category: Electrical
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Experience: Over 15yrs of experience including advanced degrees.
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Expert:  Mike G. replied 1 year ago.
The proper wire size is 2 #2 and 1 #4 Aluminum. If you're using a cable for the riser then that would be a 100A SEU.


Mike G., Master Electrician
Category: Electrical
Satisfied Customers: 5253
Experience: Proven Professional 45 years Experience
Mike G. and 2 other Electrical Specialists are ready to help you
Expert:  Electric Pro replied 1 year ago.
I apologize as I was typing a bit fast and sent the answer to you too quickly before checking it over. The neutral needs to be copper-clad aluminum or aluminum, but the size are correct.
Expert:  Mike G. replied 1 year ago.
Please disregard the last answer by Electric Pro it is incorrect.

100A service requires either of the following

Copper wire 2 #4 and 1 #6
Aluminum wire 2 #2 and 1 #4

See the Code Article below


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