The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Live Chat Feature
by Admin
01/19/17 09:52 PM
Safety at heights?
by gfretwell
01/19/17 07:16 PM
failed home inspection.
by gfretwell
01/19/17 07:03 PM
Webmaster > Admin
by Admin
01/19/17 05:49 PM
Old Bath Fan
by gfretwell
01/19/17 01:38 AM
New in the Gallery:
Desk-mounted "power-board"
Top Posters (30 Days)
Admin 33
HotLine1 21
Ruben Rocha 16
gfretwell 15
Trumpy 13
Who's Online
0 registered (), 0 Guests and 174 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#52662 - 06/01/05 08:32 PM Derating service entrance conductors
highground Offline
Member

Registered: 11/14/04
Posts: 50
Loc: Chama, NM
When installing a multigang meter socket is there deration allowed for the service entrance conductors? Thanks

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#52663 - 06/01/05 10:00 PM Re: Derating service entrance conductors
bucketman Offline
Member

Registered: 10/31/04
Posts: 71
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.

Top
#52664 - 06/01/05 10:24 PM Re: Derating service entrance conductors
frenchelectrican Offline


Member

Registered: 02/06/03
Posts: 938
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
_________________________
Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)


Top
#52665 - 06/02/05 05:30 AM Re: Derating service entrance conductors
highground Offline
Member

Registered: 11/14/04
Posts: 50
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

Top
#52666 - 06/02/05 06:48 AM Re: Derating service entrance conductors
Celtic Offline
Member

Registered: 02/26/05
Posts: 367
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.
_________________________
~~ CELTIC ~~
...-= NJ =-...

Top


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals