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Prefered method for underground SE's or feeders #8552
03/26/02 12:33 PM
03/26/02 12:33 PM
G
grouser  Offline OP
Junior Member
Joined: Feb 2002
Posts: 4
Greetings from a first time poster. I would like to hear some opinions on your prefered methods for running an underground service or feeder to a subpanel such as to a pole building or other out-building. Do you prefer 3 wire or 4 wire when you have a choice? Do you use a cable assembly or run individual conductors in conduit? What type of cable or conductors? CU or AL. I hear many different arguements on this one here in central Michigan, particularly on when you need 4 wire vs. 3 wire. Thanks for any input, Ed.

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Re: Prefered method for underground SE's or feeders #8553
03/26/02 12:55 PM
03/26/02 12:55 PM
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
I prefer to use a 4 wire installation. It will remain in complince should a conductive path be established between both buildings sometime in the future.

I have rarely had to replace an underground feeder that was installed in a raceway. I have replaced or repaired quite a few direct buried cables, usually type USE, not UF. I think it usually comes down to workmanship (not nicking the insulation & making sure the first 6" of backfill is free of rocks). I'll personally stick with single conductors in a raceway.

Most folks will jump on the savings offered by Aluminum. Since I'm the one doing the pulling, I like it also. Workmanship is very important with Aluminum conductors. I haven't had any failures that I know about.



[This message has been edited by Tom (edited 03-26-2002).]


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Re: Prefered method for underground SE's or feeders #8554
03/26/02 02:43 PM
03/26/02 02:43 PM
R
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
What size feeders are you talking about?
I believe it is preferrable to run 4 wires and use a raceway. Just because something is acceptable, doesn't mean it is good design for considerations of maintenance and reliability.

Re: Prefered method for underground SE's or feeders #8555
03/26/02 07:32 PM
03/26/02 07:32 PM
G
grouser  Offline OP
Junior Member
Joined: Feb 2002
Posts: 4
Feeders would be sized for say a 60A. to 150A.load center or anything in between.

Re: Prefered method for underground SE's or feeders #8556
03/26/02 10:34 PM
03/26/02 10:34 PM
R
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
At that size, unless your running hundreds of feet, I can't think of any compelling reason, cost-wise, not to use 4 copper conductors in a raceway (possibly even oversizing the raceway for future considerations).

[This message has been edited by Redsy (edited 03-27-2002).]


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