Reply by limelight

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Posted on 220v options in my garage?

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15 posts in 1191 days

#1 posted 09-08-2016 01:25 AM

Just one more addition to the above (regarding the guidance to only use THHN wired in conduit – not Romex). You can usually buy spools of THHN at the big box stores but they usually come in 500’ and it adds up if you don’t need that much. You can also buy it by the foot but the cost per foot goes way up.

Also if you are pulling in conduit (some mention using EMT which stands for Electrical Metallic Tubing) then the following charts (linked in the URL below) comes in handy for how many THHN conductors you can pull for a given diameter.

For instance, you can pull a maximum of 10 conductors of 10 gauge THHN for 3/4” EMT. For Schedule 40 PVC (which I happened to use for my install) it is 9. I can say from experience, pulling up to the max gets tough if you have a lot of corners to go through.

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