Re: Garage/shop wiring update

On Thu, 10 Sep 2009 21:03:57 +0100, Mark Rand
<randm@xxxxxxxxxxxxxxxxx> wrote:

On Mon, 7 Sep 2009 17:36:33 -0700 (PDT), stryped <stryped1@xxxxxxxxx> wrote:

As you know I am working on wiring a detached garage/shop. I am a
newbie. I have attached a link to my work thus far. I am having a
little trouble figuring out how to route everything. Any helpful
advice is appreciated.

http://www.flickr.com/photos/42254706@N03/


My question would be:-
Are you proposing to insulate between the studs?
If so, is the cable size correctly calculated for being inside insulation
instead of free-air or clipped-to-surface?

The difference in current carrying capacity for the two situations can be
1:1.5 depending on cable size.


Mark Rand
RTFM

There's already a big derate built into the Code for that on branch
circuit uses. If you look it up on the load charts, technically #12
THHN is good for 30 to 35 amps or so (not going to look it up now) -
but by Code you can only feed it at 20A.

Same thing with #14 and #10.

You do have to worry about it for larger circuits, but that is the
time you are mathing it all out anyway.

Stryped: Get someone local to come in and critique your work - get a
building permit and the local inspector will be glad to do it for you.

If you don't want the hassles, get a local electrician and a case of
good beer to entice him over.

--<< Bruce >>--
.

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