Business Goods & Services » Electrical question…What size should service wires be for 2 one-hundred amp services in a two family house? http://www.businessgoodsservices.com Business Goods and Services from around the world! Thu, 09 Sep 2010 16:00:22 +0000 http://wordpress.org/?v=2.9.2 en hourly 1 Electrical question…What size should service wires be for 2 one-hundred amp services in a two family house? http://www.businessgoodsservices.com/10/electrical-questionwhat-size-should-service-wires-be-for-2-one-hundred-amp-services-in-a-two-family-house/ http://www.businessgoodsservices.com/10/electrical-questionwhat-size-should-service-wires-be-for-2-one-hundred-amp-services-in-a-two-family-house/#comments Sun, 19 Oct 2008 23:49:20 +0000 admin http://www.businessgoodsservices.com/services/electrical-questionwhat-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.

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….

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