Calculating Voltage Drop for an Underground Circuit

';	Calculating voltage drop for an underground circuit… © By: Dave Rongey

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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.

Dave’s Reply:
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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Please Note:
Unless otherwise posted, please refer to the following Guidelines when working on Electrical Projects:

Skill Level:
Intermediate to Advanced - Electrical Repairs and Circuit Wiring is Best Performed by a Certified Electrician or Licensed Electrical Contractor.

Electrical Tools Required:
Basic Electricians Pouch of Hand Tools, a Voltage Tester and a Multi Meter.

Estimated Time:
Depends on personal level experience, ability to work with tools, work with electrical wiring, and the available access to the project area.

Precaution:
Identify the project circuit, turn it OFF and Tag it with a Note before working with the wiring.

Important:
Modifying existing electrical circuits or installing additional electrical wiring should be done according to local and National Electrical Codes, with a permit and be inspected.