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Old 09-01-2012, 08:55 AM   #1
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General purpose conduit to detached garage


I have a detached garage which is about 12 ft from the house and which has a separate workshop area. Expected load is portable tools and supply to recharge the plugin hybrid. I will also be supplying the main house when power goes out (from car), when there is excess photovoltaic power (to be installed) and/or when a separate static battery bank is installed and were off grid.

I was thinking of burying 3" PVC to house electrical and future water lines for carrying heated water (solar thermal). Should these conduits be separate or can I nest one inside the other? Should I use 12-2 wire or THHN/ THWN and with what housing? Also, I cannot dig to 12" unless I go below the footer (see pic).

Need advice.


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Old 09-01-2012, 10:20 AM   #2
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General purpose conduit to detached garage


You will need seperate conduits for each applicatoin...low voltage, heating tubing, and line voltage. If you are intending to use more than one circuit in the garage you will need a sub-panel.

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Old 09-01-2012, 10:28 AM   #3
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General purpose conduit to detached garage


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Originally Posted by kurtp2 View Post
I have a detached garage which is about 12 ft from the house and which has a separate workshop area. Expected load is portable tools and supply to recharge the plugin hybrid. I will also be supplying the main house when power goes out (from car), when there is excess photovoltaic power (to be installed) and/or when a separate static battery bank is installed and were off grid.

I was thinking of burying 3" PVC to house electrical and future water lines for carrying heated water (solar thermal). Should these conduits be separate or can I nest one inside the other? Should I use 12-2 wire or THHN/ THWN and with what housing? Also, I cannot dig to 12" unless I go below the footer (see pic).

Need advice.


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