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#182185 - 11/20/08 01:22 PM Does 310.15 overrule temperature limitations?
Mills Offline
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Registered: 09/24/04
Posts: 6
Loc: Carolina
I can't seem to reconcile T 310.15(B)(6) with 110.14(C)(1)(b)(1). What do you think?

This is a residential single phase overhead service drop, going to a GE meter center with feed thru lugs. The 200A main will protect the feeder to a 200A subpanel inside. Local jurisdiction using 2005 NEC.

Does 2005 NEC T310.15(B)(6) allow 4/0 Al for service and feeder, or is that trumped by the manufacturer’s label [Use 60/75C conductors], which would require 250 kcmil?

Thanks,
Mills
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#182187 - 11/20/08 02:04 PM Re: Does 310.15 overrule temperature limitations? [Re: Mills]
gfretwell Online   content


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Registered: 07/20/04
Posts: 9039
Loc: Estero,Fl,usa
Two different things.
310.15(B)(6) gives you a break on the ampacity because they know there is a lot of diversity in the total load of a dwelling. You are not using 310.16 at all.
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Greg Fretwell
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#182221 - 11/21/08 06:25 AM Re: Does 310.15 overrule temperature limitations? [Re: Mills]
SteveFehr Offline
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Registered: 03/19/05
Posts: 1195
Loc: Chesapeake, VA
Originally Posted By Mills
Does 2005 NEC T310.15(B)(6) allow 4/0 Al for service and feeder, or is that trumped by the manufacturer’s label [Use 60/75C conductors], which would require 250 kcmil?
The safe bet is always to ask your AHJ as theirs is the only opinion that matters, but I concur with Greg, 310.15(B)(6) requires 4/0, and specifically states you don't have to go larger. 310.16 does not apply to this cable.
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