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Tractor Talk Discussion Forum

OT shop electrical feeder line

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ed1

03-29-2007 18:07:27




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I'm about to run an underground electrical feeder to my garage in plastic conduit about 300' away.

Thinking #4 for 70 amps but wondering if I need to go with #3.




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old art

03-30-2007 19:45:35




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 Re: OT shop electrical feeder line in reply to ed1, 03-29-2007 18:07:27  
put a smaller pipe along side for a phone line or an intercon (phone and intercom need twisted pair mires or it wont work phone cable is the best) old art



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dave guest

03-30-2007 19:05:47




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 Re: OT shop electrical feeder line in reply to ed1, 03-29-2007 18:07:27  
You gotta have 4 wires in a feeder that is from one building to another. Code says so mich and national. Nothing less is safe. Safety first even above code and above cost.



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John T

03-30-2007 07:22:37




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 Re: OT shop electrical feeder line in reply to ed1, 03-29-2007 18:07:27  
Ed, Its your money and your choice but (to spend your money is easy lol) heres things you may wanna consider. First, if that buried conduit passes under any driveways or future driveways, Id want it to be RIGID conduit in those portions at least. While direct burial rated cable will suffice in other locations, for no more then plastic conduit costs (versus the wire) why not use it. Second, if youre gonna go the expense of trenching n conduit etc WHY NOT GO AHEAD N RUN A 100 AMP 120/240 VOLT SERVICE OUT THERE???

DEPENDING ON LOAD You could get by with three No. 1 conductors, being Two Hots and One Neutral with the Neutral grounded at the garage. Then use a 100 amp panel for 120/240 volt service at the garage.

Of course, theres voltage drop in the lines dependant upon the distance n amperage which may require bigger conductors, and if its critical one should run the calculation.

John T

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Bus Driver

03-30-2007 05:34:08




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 Re: OT shop electrical feeder line in reply to ed1, 03-29-2007 18:07:27  
300' will have some voltage drop, greater drop at higher amperages. Do, or have someone do, the calculations before selecting the conductors.



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showcrop

03-29-2007 20:57:47




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 Re: OT shop electrical feeder line in reply to ed1, 03-29-2007 18:07:27  
while you have your ditch open put a 1.5 inch pipe in there for spmething else that you don't know yet that you need.



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huntingreen

03-29-2007 20:35:17




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 Re: OT shop electrical feeder line in reply to ed1, 03-29-2007 18:07:27  
Run 4 wire service. drive a ground rod at the shop. Put it in conduit you will not regret it later. Direct burial cable you might regret some day.



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in-too-deep

03-29-2007 19:05:03




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 Re: OT shop electrical feeder line in reply to ed1, 03-29-2007 18:07:27  
I wouldn't think conduit would be necessary. If you buy underground cable, it should be fine. Just use it at both ends where it comes out of the ground. I also agree with Two Mile...go for the big stuff if you can.



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old

03-29-2007 19:13:16




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 Re: OT shop electrical feeder line in reply to in-too-deep, 03-29-2007 19:05:03  
Most state its law to run the pipe. Another reason to do it is so a rock etc doesn't knick a wire then you have a ground loose and that can cost you big big bucks paying for power that is bleed off into the ground.



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in-too-deep

03-30-2007 06:21:26




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 Re: OT shop electrical feeder line in reply to old, 03-29-2007 19:13:16  
That's a good point. I guess where I'm at we don't have to put in conduit underground. I spuppose conduit is cheap enough and doesn't take very long to glue it together, might as well use it. Plus, if he needed to, he could pull different wire through it at a later date.



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two mile

03-29-2007 18:57:50




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 Re: OT shop electrical feeder line in reply to ed1, 03-29-2007 18:07:27  
You only bury the stuff once. I would put in #2 knowing that if I ever needed 100 amp that I had the ability to do it. You can still use the lower amp breaker and save a few bucks.



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dave guest

03-29-2007 18:25:36




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 Re: OT shop electrical feeder line in reply to ed1, 03-29-2007 18:07:27  
Need to figure load to be used and voltage drop. Last 300' run I did was for fluorescent sign. Inspector insisted on #10 for voltage drop reasons. I would say one size over at least. There are formulas for this but I haven't used them in years. EE can tell you.



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steveormary

03-29-2007 21:17:32




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 Re: OT shop electrical feeder line in reply to dave guest, 03-29-2007 18:25:36  

ed1

You can get 2-2-4 USE service cable. Put it in 11/4 or 11/2 pvc conduit. You will need schedule 80 above ground. Or use 2-2-2-4. These would be aluminum cable. Mabe check with the local elect insp. or your power provider.

steveormary



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