400 amp parallel service wire size

Find Service Wire now. Using 600AL on a service with single main 400 amp OCPD is noncompliant even using the round up rule as 350 amp OCPDs are available.

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. As a generally accepted method in all of the NC countries an municipalities I have worked in over the past twenty years inspectors have always passed parallel 30 copper conductors for a 400 amp service. Assuming 90 degree insulation paralled 40 copper or 300 aluminum would be the minimum as 260 amps x 2 x 80 416 for copper and 255 amps x 2 x 80 408 amps for Aluminum. A person needs to select a conductor size with an ampacity past 350 amps to be able to select the next size up 400 amp OCPD assuming the calculated load is less than the conductor ampacity.

However an inspector has turned down my service with the explanation that the circular mill of the 30 copper must equal or exceed the same as. This is the new ebay. Were this not a residential service youd have to provide for the full 400A nominal requirement whichd require another size bump to paralleled 350kcmil conductors You are correct that 600kcmil is the right size for using a single wire per leg for the service entrance though -- this gives you 340A at 75C just enough to meet our 332A requirement.

Nov 9 2006. 600AL is 340 amp conductor. Ad Browse Our Variety Of Electrical Wires- Smart Stylish Options From Trusted Brands.

Lowes Has All Of The Essentials You Need To Tackle Your Electrical Project. 23042B also requires the minimum ampacity for ungrounded conductors to be not less than the rating of the service disconnecting means which you have given as 400 amps.

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