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-   -   Do I need a ground from my main to my subpanel if I'm using aluminum conduit? (http://www.diychatroom.com/f18/do-i-need-ground-my-main-my-subpanel-if-im-using-aluminum-conduit-159335/)

ochoaj 10-07-2012 10:04 PM

Do I need a ground from my main to my subpanel if I'm using aluminum conduit?
 
I am installing a 70A type subpanel in my dettached garage that will be fed from a 50A breaker in my main panel. Total distance is 71ft and Im running it underground. I heard if I use aluminum conduit from the main to the sub that I dont need to bring a ground from the main. Is this true? So all I need for my long cable run is #6 3 conductor for my 2 hots and one neutral?

jbfan 10-07-2012 10:13 PM

That is true, but it would be cheaper to install pvc, and run a #10 wire for the ground.

ddawg16 10-08-2012 02:28 AM

Even if you use AL conduit....do you really want to depend on the aluminum maintaining good continuity over the life of it?

PVC will be cheaper....but regardless of which one you use, run the ground wire....

I think it's poor practice to depend on conduit for earth ground.

mpoulton 10-08-2012 01:19 PM

Aluminum conduit is perfectly fine as a grounding conductor. However, aluminum conduit doesn't do well underground in many soil types. Any degree of alkalinity can cause it to corrode away quickly. For underground, use PVC and a separate grounding conductor.


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