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Country Discussion Topics
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Service to my garage
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fw    Posted 12-03-2002 at 05:43:19       [Reply]  [No Email]
im wondering what gauge of wire i should run
for a 40 amp/120v line underground about 20 ft.?


Les    Posted 12-03-2002 at 12:00:35       [Reply]  [No Email]
500 MCM otta do it ";^O


Red Dave    Posted 12-03-2002 at 07:26:59       [Reply]  [No Email]
If you go to a reputable electrical supply house and tell them what you want to do and how far it is, they should be able to sell you a cut length of what you need, of a type suitable for direct burial. Don't forget to add enough for hookup in the boxes.
Old electricians rule #1 "you can cut off a mile, but you can't add an inch"


TB    Posted 12-03-2002 at 07:58:01       [Reply]  [No Email]
Yep I would rather look at it than to be looking for it. 40 amps isn't very mush you may want to consider a 60 or 100 amp sub panel. Then you can run circuits to do whatever you want. Another rule is. It is cheaper to do it once than it is to do it twice. # 8 copper should handle 40 amp the type of wire will depend on wither it is direct burial or in pipe. See your electrical supply house for details.


Hal/WA    Posted 12-03-2002 at 12:14:16       [Reply]  [No Email]
I agree. Unless you never want to power anything more than lights and a battery charger or similar low power users, I would suggest using a 100 amp panel with a main breaker. Then if you later want to weld, use a large compressor or even add a second kitchen range, it is easy to do so.

It does cost a little more as you need a 100 amp breaker in your main panel and heavier wire to the subpanel, but the 100 amp subpanel does not cost much more than a lower capacity panel.

When I built and wired my attached garage, I used a 100 amp subpanel that I thought had enough room for the breakers I would need. If I had it to do over, I would find a panel with more spots for breakers. I used aluminum wire from my main breaker box to the subpanel and sized it 1 size larger than the minimum acceptable gauge for the distance involved. I used the proper breakers, cleaned the conductor and used the special paste to prevent corrosion, just like the experts recommended and just like the other heavy wiring was done in my new house. No problems at all.

Wiring is fairly hard work and I don't like doing jobs over because I did not do them properly the first time. If you have any doubts about your ability to do the job, hire a licensed electrician. You also might want to read the book "Wiring Simplified" that most building material stores sell. It has most of the answers to anyone's questions about wiring and is easy to understand. Good luck!


Hogman**********If You think    Posted 12-03-2002 at 07:25:04       [Reply]  [No Email]
40 will do it why not think big,save later regrets run 3 wire #6 at 50 amp 220 and put in a small load center. The wire sizes posted are correct per Nat code,(copper).

Found out years ago You should figure out how much You "realy need,double it,and just so it will take a little longer to find out Ya needed more double it again! I do that. Does it work? Ha! added a wing to My shop ,put in as per stated plan,How long befor enterin last stage? I'm not done wirin and already bought 70 feet of what I should have started with as feeder and am fixin ta tear out that "more than ample" load center and put in one twice as big.Course, I can use that # 8 run to feed a welder outlet so not a total loss.

How many times have I ignored My own advice in tha past? TOO many and now again!


pilgrim    Posted 12-03-2002 at 06:31:30       [Reply]  [No Email]
I was taught a rule of thumb:
15A = 14 ga.
20A = 12 ga.
30A = 10 ga.
40A = 8 ga.

all use copper wire

Dont know if that's what codes call for but I was always told to use that as a guide. when I had my house built that's what the elctrician used for the circuits he installed.


Bob /Ont.    Posted 12-03-2002 at 06:15:48       [Reply]  [Send Email]
Just a thought FW, but an electric stove is fused at 40 amp 240 volt. You could use electric range cable out there , take half of your circuits off each side of the 240, this would cut the amps in half if you turned everything on at once and you would have 240 volts if you need it in the future.
Later Bob


bob ny    Posted 12-03-2002 at 06:28:38       [Reply]  [No Email]
good advise i just ran a service to my garage i used no. 2underground in pvc love the 220


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