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Sizing up feeders #47584
01/19/05 05:18 PM
01/19/05 05:18 PM
R
RichardTatem  Offline OP
Member
Joined: Jan 2005
Posts: 11
quincy,ma,02169
Iam wiring 5 apartment units, each unit having 60 amp panel, what is the the total service that I will need to have. wire size? amps size , thanks

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Re: Sizing up feeders #47585
01/19/05 05:38 PM
01/19/05 05:38 PM
I
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
With the limited info given it would have to be 300 amps.

However I would bet that is way oversize.

The only way to give an accurate answer to this question would be to know the total calculated load.

Bob


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Re: Sizing up feeders #47586
01/19/05 06:08 PM
01/19/05 06:08 PM
R
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
Richard, use article 220 to figure this out for yourself, then post you figures here.

Roger

Re: Sizing up feeders #47587
01/19/05 06:25 PM
01/19/05 06:25 PM
C
CTwireman  Offline
Member
Joined: Feb 2002
Posts: 840
Connecticut, USA
With a question like that you wouldn't be wiring my apartment building.

My point is this: Everyone has their limitations. An electrician who has done commercial work for their whole career might be baffled by residential. Likewise, someone who only wires homes will probably have a hard time with a motor starter.

Peter D.

[This message has been edited by CTwireman (edited 01-19-2005).]


Peter
Re: Sizing up feeders #47588
01/19/05 06:57 PM
01/19/05 06:57 PM
B
Bob  Offline
Member
Joined: Feb 2002
Posts: 182
Mobile, AL, USA
Isn't this the same question you asked under
your post "amps"? Its hard to believe you would be installing only a 60 amp panel. I would think the min would be 100 amps.

[This message has been edited by Bob (edited 01-19-2005).]

Re: Sizing up feeders #47589
01/19/05 07:17 PM
01/19/05 07:17 PM
S
shortcircuit  Offline
Member
Joined: Jun 2004
Posts: 610
massachusetts
230.79(C) restricts the minimum rating of 100 amps for each dwelling.

With an AC load of 40 amps for each unit, I'd say 400amp to 600amp depending on sq ft of each.

You need a public meter for general areas.

shortcircuit

Re: Sizing up feeders #47590
01/19/05 07:25 PM
01/19/05 07:25 PM
R
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
Shortcircuit, the 100 amp mininmum would only apply to a One-Family Dwellingsee definition of Dwelling, One-Family in article 100.

Richard, why don't you attempt to do the math and let us see what you come up with?

Peter has a good point, this seems to be out of your expertise.

Roger

[This message has been edited by Roger (edited 01-19-2005).]

Re: Sizing up feeders #47591
01/19/05 08:38 PM
01/19/05 08:38 PM
S
shortcircuit  Offline
Member
Joined: Jun 2004
Posts: 610
massachusetts
Your correct Roger...I only looked at the definition of Dwelling Unit [Linked Image]

shortcircuit


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