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Derating service entrance conductors #52662 06/01/05 10:32 PM
Joined: Nov 2004
Posts: 53
H
highground Offline OP
Member
When installing a multigang meter socket is there deration allowed for the service entrance conductors? Thanks

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Re: Derating service entrance conductors #52663 06/02/05 12:00 AM
Joined: Oct 2004
Posts: 72
B
bucketman Offline
Member
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.

Re: Derating service entrance conductors #52664 06/02/05 12:24 AM
Joined: Feb 2003
Posts: 939
F
frenchelectrican Offline
Member
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


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

Re: Derating service entrance conductors #52665 06/02/05 07:30 AM
Joined: Nov 2004
Posts: 53
H
highground Offline OP
Member
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

Re: Derating service entrance conductors #52666 06/02/05 08:48 AM
Joined: Feb 2005
Posts: 361
C
Celtic Offline
Member
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.


~~ CELTIC ~~
...-= NJ =-...

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