# Calculating Voltage Drop for an Underground Circuit

 Calculating voltage drop for an underground circuit…

### Generator Automatic Transfer Switch and Electric Circuit Sub Panel

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Determining Voltage Drop for an Underground Circuit
Background: John, a Homeowner from Forrest hills, NY
[ad#block]Question: I’m installing two 110v line at 20amps, at three hundred feet is # 6 THHN enough or should it be # 6 THWN this run is under ground in PVC.

Thanks for your electrical question John.
When installing wire in underground PVC conduit use THWN, not THHN.
Please see the link below to calculate the wire size for running the circuit 300 feet so you can factor in voltage drop.

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## without a Ground Wire

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The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.

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The Plug-In Outlet Tester
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The Wire Stripper and Wire Cutter
My absolute favorite wire stripping tool that I have had in my personal electrical tool pouch for years, and this is the tool I use to safely strip electrical wires.
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