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Shed wiring

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Posted by Mike Ruskai on September 15, 2007, 7:17 pm
I'm putting together a plan to run power to a new shed, and want to do
it properly.

Starting backwards, I have a 125A subpanel for the shed, in which I'll
put two 20A circuits for outlets (with one possibly going outside),
and one 15A circuit for lights.

The part of the shed where I'd bring the power in is about 70 feet
from the part of the house where power would go out.  There's one
slight turn in that path, to avoid the driveway.  From there, it's
another 55 feet to the main panel inside the house.

My plan is to run one length of 6/3 from a 40A or 50A double breaker
at the main panel to the subpanel, using buried PVC conduit for the
outside portion.  

I've hunted up enough information to do all this mostly comfortably,
but I'd like a bit of confirmation on some questions:

1)  Is 6 gauge wire sufficient for 40A over about 125 feet, a bit more
than half of which is in buried conduit?  What about 50A?

2)  How wide should the conduit be?  This is the only wire that will
be inside, so beyond fitting the wire, the only concern is heat

3)  How deep should the conduit be buried?

Thanks in advance for any answers.

Posted by Stuart on September 15, 2007, 7:58 pm
There are many things in your question that will cause this group not to
reply exactly to your questions because we don't want to be contributing to
a future problem. Here are just a few more things to think about - where are
you located (top of hill?)relative to the frequency of lightening strikes?
What is the average and peak draw to the subpanel? Have you considered using
a 220 v cable to the subpanel? And if 220 v, will you be using four wire
cable or three wire cable and an additional ground rod? Is the shed enclosed
from rodents or open so you need to use 100% armored cable and metal boxes?
Why use conduit at all when you can use direct burial cable? And most
importantly are you in an area subject to building codes?


Posted by clare at snyder.on.ca on September 15, 2007, 8:45 pm

Sure looks like he's running 220, or he would not be running 6/3 wire.
Which also answers the question if he is running 3 plus ground or 4.
6/3 will have red, white, black, and bare wires.

Posted via a free Usenet account from http://www.teranews.com

Posted by You on September 16, 2007, 5:25 pm

 clare at snyder.on.ca wrote:

Since he is planning on using a "Double Breaker, in his Main Panel,
to feed the Sub-Panel in the "New Shed", most folks would "Assume"
that he would be feeding 240Vac SinglePhase thru the conduit, which
if PVC, would require 3 Ea. #6 Wires, plus a Ground.

Posted by Mike Ruskai on September 15, 2007, 11:13 pm
 On or about Sat, 15 Sep 2007 15:58:03 -0400 did "Stuart"

Yes, certainly, *not* answering questions is the best way to avoid
contributing to problems.

Lightening only strikes when the second nearest neighbor turns on the
flood light over his garage.  

My back yard is about 4 acres of woodland that's 30+ feet over the top
of both my house and shed, not counting the trees.

Right now, the average and peak draw are both 0, since I haven't wired
anything.  Surely the fact that I intend to have two 20A circuits and
one 15A circuit, supplied by a 40A or 50A supply, indicates just what
I think the peak draw would be.

I wouldn't base any wiring decisions on average draw, but maybe I'm
just crazy.

I'm beginning to wonder if you even read my post.  What do you think
I've considered, given that I stated I'd be running 6/3 wire from a
double breaker?

The occasional mouse that gets into the basement doesn't go gnawing on
wires, so why would they do it in the shed, if they managed to get in?
Or are we talking about the possible infiltration of an R.O.U.S.?

Because I glanced at the price of UF cable.

No, I live in my own private country.  I make all the rules, and I
asked the specific questions I did just to waste other people's time.

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