ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
600 KW 120/208 3 Phase Y protection
by Yooperup. 07/21/17 09:27 AM
1913 American Electrician's Handbook
by gfretwell. 07/20/17 01:08 PM
Green House wiring
by ghost307. 07/20/17 09:10 AM
Permit Snafus...AHJs and Contractors Jump in
by HotLine1. 07/18/17 08:06 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
239,204 Are you busy
174,601 Re: Forum
167,030 Need opinion
Who's Online Now
0 registered members (), 56 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#47584 - 01/19/05 05:18 PM Sizing up feeders  
RichardTatem  Offline
Joined: Jan 2005
Posts: 11
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

Work Gear for Electricians and the Trades

#47585 - 01/19/05 05:38 PM Re: Sizing up feeders  
iwire  Offline
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 Badger
Construction & Maintenance Electrician

#47586 - 01/19/05 06:08 PM Re: Sizing up feeders  
Roger  Offline
Joined: May 2002
Posts: 1,716
Richard, use article 220 to figure this out for yourself, then post you figures here.


#47587 - 01/19/05 06:25 PM Re: Sizing up feeders  
CTwireman  Offline
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).]


#47588 - 01/19/05 06:57 PM Re: Sizing up feeders  
Bob  Offline
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).]

#47589 - 01/19/05 07:17 PM Re: Sizing up feeders  
shortcircuit  Offline
Joined: Jun 2004
Posts: 608
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.


#47590 - 01/19/05 07:25 PM Re: Sizing up feeders  
Roger  Offline
Joined: May 2002
Posts: 1,716
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.


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

#47591 - 01/19/05 08:38 PM Re: Sizing up feeders  
shortcircuit  Offline
Joined: Jun 2004
Posts: 608
Your correct Roger...I only looked at the definition of Dwelling Unit [Linked Image]


Member Spotlight
Anaheim, CA. USA
Posts: 2,707
Joined: October 2000
Show All Member Profiles 

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.013s Queries: 14 (0.002s) Memory: 0.7913 MB (Peak: 0.9499 MB) Zlib enabled. Server Time: 2017-07-22 14:35:58 UTC