Cu vs. Al

Reply

  #1  
Old 06-14-07, 12:42 PM
Member
Thread Starter
Join Date: Jun 2007
Posts: 3
Cu vs. Al

I am going to run an underground cable from my house panel to my barn (250') for lights and a receptacle. Would it be best to use 10-3/ground or equivalent aluminum for cost purposes. If so what size conductor in Al would I need? thanks
 
Sponsored Links
  #2  
Old 06-14-07, 12:48 PM
Member
Join Date: Sep 2003
Location: Central New York State
Posts: 13,973
At that distance with 10 gage wire you will not get much power. What were you planning for out there?

I would run aluminum and power a sub panel.
 
  #3  
Old 06-14-07, 01:00 PM
Member
Thread Starter
Join Date: Jun 2007
Posts: 3
Cu vs. Al

I was planning on 3- 75 watt lights, and one 120 receptacle for light portable tools.
 
  #4  
Old 06-14-07, 01:11 PM
Member
Join Date: Aug 2005
Location: USA
Posts: 995
"I would run aluminum and power a subpanel"

Yeah, what he said. The wire savings would probably pay for a 60A subpanel.
 
  #5  
Old 06-14-07, 01:42 PM
Speedy Petey's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Nov 2003
Posts: 2,455
I also agree. I would not limit yourself to a multi-wire circuit (two circuits).
You'll be sorry later when you get that 220v compressor you've always wanted.
 
  #6  
Old 06-14-07, 02:20 PM
Member
Join Date: Mar 2005
Posts: 433
You'll be sorry when you run 10 gauge CU and the voltage drop is so bad you can't light a 75w bulb.
 
  #7  
Old 06-14-07, 02:27 PM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 14,427
You won't be able to find AL wire that small.
 
  #8  
Old 06-14-07, 03:42 PM
Member
Join Date: Aug 2005
Location: USA
Posts: 995
No, but larger aluminum cable will be cheaper anyway, which is he why he should consider the subpanel.
 
  #9  
Old 06-15-07, 08:28 AM
Forum Topic Moderator
Join Date: Feb 2005
Location: Near Lansing, Michigan
Posts: 10,335
This is a good case for aluminum #2-2-2-4 underground mobile home feeder cable; it should be available at all the big box stores and supply houses. Normally, this cable is good for 100A, but over the 250' distance it shouldn't be used for more than 50A.

Given the distance, #10 copper is too small for even a 15A circuit. You would need to upsize to #8/3 UF for a 15A or 20A multiwire circuit.

#8/3 UF is about $2.49/ft. and 2-2-2-4 AL is about $2.60/ft. Three times the available power for about 10c more per foot.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes
'