Charlotte Business Daily

Electrical question...What size should service wires be for 2 one-hundred amp services in a two family house?

I ask that becuase NEC code specifies wire size for services according to amperage for single and multifamily dwellings...but don't specify if you're suppose to add the amperage up if you have more than one service...or the wire size that will accomodate 100 amp service will still be sufficient with another 100 amp service.

Public Comments

1. If their seperate entrances with seperate meters use 100 amp specs for each.If its a single service split then total amperage would apply. Check local specs for entrance wire size as needed.Normal 1/0 for 100,2/0 for 200 applies where i live.....George
2. 4-0 alum wire..............three pieces of 4-0 wire coming down from the weather head to the meter....then three pieces of 2-0 plus one piece of number 6 green wire for another ground that is required by electrical code! Do this to both meter boxes into the pannel boxes!
3. this depends on whether both 100 amp services will use the same drop line or will have separate drop lines with separate weather heads....if both of them will be gang mounted with one service head then you will have to use 2/0 copper or 4/0 aluminum....if they are` both going to have there own weather head and services then you would only need 1/0 copper or 2/0 aluminum...plus grounds for both services....