Calculating Voltage Drop for an Underground Circuit
Calculating voltage drop for an underground circuit…
Determining Voltage Drop for an Underground Circuit
Background: John, a Homeowner from Forrest hills, NY
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.
I have provided the following links that lead to fully detailed information on this website that will assist you with your electrical question:
For more information about Electrical Wiring
This link is helpful as a Homeowner
Make sure not to miss these Resources for: How-To-Videos
Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.
The Safest Way to Test Electrical Devices and Identify Electric Wiring!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, [amazon.com], I use for the detection of Standard 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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