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-   -   running wire to a detached shed subpanel (http://www.diychatroom.com/f18/running-wire-detached-shed-subpanel-19079/)

amakarevic 03-27-2008 10:39 AM

running wire to a detached shed subpanel
 
INTRO: to install a 40 or 50 AMP subpanel in a shed, which will be used for lighting inside, a 15, a 20, and a 30 amp (240V) outlet, as well as a garage door, i plan to run a weatherproof cable from my basement to the subpanel.

Q1: which gauge wire should i use and how many wires in the cable ? i was thinking 6/2 ?

Q2: which size plastic conduit should i use ? i thought that 3/4 should do.

Q3: will the new subpanel require a grounding rod ?

Q4: the wire shall run from the front of the basement its entire length (approx. 50 ft) to the back, then go through the wall outside. is it appropriate to use regular indoor cable inside and then a JB to connect it to the wet cable going outside to save $, assuming that the latter is more expensive ?

much obliged,

- a -

HouseHelper 03-27-2008 10:45 AM

Q1 - 6/3UF or three #6THWN, one #10THWN in conduit.
Q2 - use 1"
Q3 - yes
Q4 - 6/3NM to UF, 6/3NM to THWN, or UF all the way.

amakarevic 03-27-2008 10:56 AM

Quote:

Originally Posted by HouseHelper (Post 111311)
Q1 - 6/3UF or three #6THWN, one #10THWN in conduit.
...
Q4 - 6/3NM to UF, 6/3NM to THWN, or UF all the way.

what is the technically simplest vs. the cheapest solution ?

amakarevic 03-27-2008 01:36 PM

also, do you recommend a 40 or a 50 AMP subpanel ?

thanks,

- a -

220/221 03-27-2008 01:42 PM

Easiest way is UF all the way if you can do it. Less splices and j boxes means less chance for failure.

UF is rated for direct burial @ 24" .

It is difficult to pull thru smaller (less than 1 1/2") unless it's a straight shot.


I am not a big UF fan and I have all the tools and materials available so I would use romex (NM) inside to a j box, underground with 1" PVC and pull in THWN @ 18" deep to the panel (or to another j box, back to romex(NM) and to the panel)


40 or 50? Bigger is generally better.

If you go 40 you can use 3#8's and a 10 ground and 3/4" conduit.

amakarevic 03-27-2008 01:50 PM

does your preferred way involve using multiple THWNs or do they come bundled in a cable ?

what is the difference b/ween UF and THWN ?

thanks,

- a -

HouseHelper 03-27-2008 03:28 PM

Quote:

Originally Posted by amakarevic (Post 111367)
does your preferred way involve using multiple THWNs or do they come bundled in a cable ?

what is the difference b/ween UF and THWN ?

thanks,

- a -

UF is a made weatherproof cable consisting of two or more insulated conductors and a bare grounding conductor. THWN is an individual wire rated for wet locations.

amakarevic 03-27-2008 04:30 PM

in other words, to make it simple, go UF rather than THWN.

220/221 03-27-2008 05:13 PM

Quote:

Originally Posted by amakarevic (Post 111424)
in other words, to make it simple, go UF rather than THWN.


No...the same words :thumbsup:

Quote:

Easiest way is UF all the way if you can do it. Less splices and j boxes means less chance for failure.

UF is rated for direct burial @ 24" .


amakarevic 03-27-2008 05:15 PM

is it deeper or shallower than 24" that i should be worrying about ? i will be going deeper.


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