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Old 01-08-2011, 10:57 PM   #1
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Electric and Water lines in same trench


I am running power and water lines to new shop 70 feet from house.
I have dug a trech 2 feet deep, for water I am using 3/4" pvc and for electric I am using 3/4 grey pvc #40 using 12/2 with ground.
My question, can I run both lines in same trench? If so - can they both lay at same depth or should I run electric above water line and how many inches above?
Thanks
LD

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Old 01-08-2011, 11:08 PM   #2
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Electric and Water lines in same trench


Are you using uf cable in the conduit?

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Old 01-08-2011, 11:16 PM   #3
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Electric and Water lines in same trench


I am not using UF wiring, but am using the grey conduit

Last edited by lond; 01-08-2011 at 11:18 PM.
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Old 01-08-2011, 11:16 PM   #4
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Electric and Water lines in same trench


Where do you live? Water lines must be below the frost line.
In my area this is 4 feet.
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Old 01-08-2011, 11:18 PM   #5
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Electric and Water lines in same trench


Quote:
Originally Posted by lond View Post
I am not using UF wiring.
UF wire can be run underground
Reg 12-2 can't be run underground
You need THWN, individual wires
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Old 01-08-2011, 11:20 PM   #6
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Electric and Water lines in same trench


Like dave said, nm-b cannot be installed in a wet location.

Here 2 feet is way below the frost line.
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Old 01-08-2011, 11:25 PM   #7
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Electric and Water lines in same trench


I live in Tucson Arizona and we get less than a foot of rain a year. As for the frost line.... it does get cold and maybe a frequent freeze once or twice a year of course at night.
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Old 01-08-2011, 11:28 PM   #8
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Electric and Water lines in same trench


being not much rain and no freezing, this is why I was thinking of laying the water line at 2 ft and then lay the electric line at 16" ..... thoughts
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Old 01-08-2011, 11:31 PM   #9
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Electric and Water lines in same trench


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being not much rain and no freezing, this is why I was thinking of laying the water line at 2 ft and then lay the electric line at 16" ..... thoughts
They can lay side by side, but you still have the issue of 12/2 non uf in a wet location that is against code.
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Old 01-08-2011, 11:36 PM   #10
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Electric and Water lines in same trench


Thank you and I will reconsider changing to UF wiring
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Old 01-09-2011, 12:44 AM   #11
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Electric and Water lines in same trench


side by side is perfectly fine, but as others have said, either individual conductors or UF.

What is the pvc water line for? You know pvc isnt drinkable, right?
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Old 01-09-2011, 02:31 AM   #12
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Electric and Water lines in same trench


Why aren't you running at least 60A to you shop? Conduit has to be buried to 18", direct burial wire to 24". I recommend 1" pvc for future expansion. As mentioned above romex can't be outside.
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Old 01-09-2011, 06:48 AM   #13
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Electric and Water lines in same trench


You stated (I will reconsider changing to UF wiring).

Will you re-consider, re-pulling with UF, or digging everything back up to do it correctly when it fails??

Bob

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Last edited by Hourglass52; 01-09-2011 at 06:51 AM.
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