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#52662 - 06/01/05 08:32 PM Derating service entrance conductors
highground Offline
Member
Registered: 11/14/04
Posts: 53
Loc: Chama, NM
When installing a multigang meter socket is there deration allowed for the service entrance conductors? Thanks
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#52663 - 06/01/05 10:00 PM Re: Derating service entrance conductors
bucketman Offline
Member
Registered: 10/31/04
Posts: 72
Loc: vancouver WA, USA.
I'm trying to think why you would have more than three current carrying conductors in a service enterance.

the only thing I could think of is if it were paralleled.
but still in parallel it's like their the same conductor.
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#52664 - 06/01/05 10:24 PM Re: Derating service entrance conductors
frenchelectrican Offline
Member
Registered: 02/06/03
Posts: 939
Loc: Wi/ Paris France { France for ...
the biggest issuse is busbar of multi meter socket set up is the rating of main busbar feed to all meters you have to watchout the rating i ran into few of that for incomming service cables and out going cables most meter manufacter will list a warning there


Merci, Marc
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Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)

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#52665 - 06/02/05 05:30 AM Re: Derating service entrance conductors
highground Offline
Member
Registered: 11/14/04
Posts: 53
Loc: Chama, NM
What I meant was, if you have say a four gang setup with 200+200+200+200 amps do the service entrance conductors need to have an ampacity of 800 amps in a residential setting?
Thanks
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#52666 - 06/02/05 06:48 AM Re: Derating service entrance conductors
Celtic Offline
Member
Registered: 02/26/05
Posts: 361
Loc: NJ
No, the sum of the metering doesn't neccessarrily need to equal the whole of the service.
See:
Annex D ~ Example D4(a) Multifamily Dwelling; Example D4(b) Optional Calculation for Multifamily Dwelling


The Annex refers back to each applicable article,ie T220.10

A two-family home might require a house panel(40A), an 100A panel(1st floor) and a 60A panel (2nd flr) - but the service might be 150A...depending on the calculated load.
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