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  1. #1
    Join Date
    Apr 2008
    Posts
    74

    Default Burying Electrical Wiring to Outbuilding

    Hello, All:

    I'm happy to see some familiar names still here!

    I need to bury some wiring to a small shed/barn I built approximately 40 feet from the house. When I finished off my garage, I ran a separate 20 amp GFI circuit that I capped off on the exterior of the house nearest the barn.

    Now I need to connect from there to the barn and I would prefer to do it underground.

    My question: How far under the surface should the wiring be run? I'm planning on using the gray PVC conduit available in most hardware stores. The surface above the are where I will run the wiring will be (and will remain for the foreseeable future) as sod / grass.

    Any advice would be greatly appreciated.

    Tim

  2. #2
    Join Date
    Aug 2007
    Location
    Denver, CO
    Posts
    666

    Default Re: Burying Electrical Wiring to Outbuilding

    Per 08 NEC table 300.5 column 4, 12" per your description.

  3. #3
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,622

    Default Re: Burying Electrical Wiring to Outbuilding

    Best to check with your locale building dept. Some places require a deeper depth than NEC and also may require signage.
    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  4. #4
    Join Date
    Jan 2008
    Location
    Lakeland ,MN
    Posts
    356

    Default Re: Burying Electrical Wiring to Outbuilding

    Quote Originally Posted by kentvw View Post
    Per 08 NEC table 300.5 column 4, 12" per your description.
    I agree with Kent unless it is under a road
    Harry

  5. #5
    Join Date
    Apr 2008
    Posts
    74

    Default Re: Burying Electrical Wiring to Outbuilding

    Thanks to all who replied.

    I'll check with the local bldg inspector and do it right.

    Tim

  6. #6
    Join Date
    Apr 2008
    Posts
    74

    Default Re: Burying Electrical Wiring to Outbuilding

    Quote Originally Posted by asc2078 View Post
    Using the PVC is a good plan. Tip: Slipping a pull rope through the sections of PVC as you are fitting them together, makes for an easy install of the wire.

    DB
    Yes, I've also heard a little dish detergent can help the wire slide through easier over a long run.

    Thanks,

    Tim

  7. #7
    Join Date
    Aug 2007
    Location
    Denver, CO
    Posts
    666

    Default Re: Burying Electrical Wiring to Outbuilding

    I too have used dish soap for pulling lube in the past. However, I've also had to replace wiring where dish soap was used. The stuff never really dries and turns to a sticky mess.

    We use a line blower and jet line most of the time but a low tech way to do it is to tie a line to one of those really thin plastic bags you get from the corner gas-n-go and suck them through with a shop vac.

  8. #8
    Join Date
    Jan 2008
    Location
    Lakeland ,MN
    Posts
    356

    Default Re: Burying Electrical Wiring to Outbuilding

    Quote Originally Posted by TRLambert View Post
    Yes, I've also heard a little dish detergent can help the wire slide through easier over a long run.

    Thanks,

    Tim
    Dish soap has Lanolin in it. It has been know to damage the insulation on wires. That is why they make a special pulling lubricant. Ideal 77 is one of them. There are alot of nicknames for this stuff but I won't go there.
    Harry

  9. #9
    Join Date
    Jun 2007
    Location
    Shamokin, Pa.
    Posts
    645

    Default Re: Burying Electrical Wiring to Outbuilding

    Quote Originally Posted by kentvw View Post
    I too have used dish soap for pulling lube in the past. However, I've also had to replace wiring where dish soap was used. The stuff never really dries and turns to a sticky mess.

    We use a line blower and jet line most of the time but a low tech way to do it is to tie a line to one of those really thin plastic bags you get from the corner gas-n-go and suck them through with a shop vac.
    Many a time you do not even need a balloon on the end of the twine. Just as you posted, suck the twine though with a trusty shop-vac....

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