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220 Volt Hot Tub Circuit Wiring

Homeowner wants me to install a 220V hot tub. She said the run is about 220 feet..

Electrical Question from Mike about Hot Tub Wiring
Background: Mike, a Electrician from Pittsburgh, PA
Question: Homeowner wants me to install a 220V hot tub. She said the run is about 220 feet, and I did not have to drill holes as there is a duct. I have been working as an electrician for the past three years, and I know you can’t do a run inside a duct, you can tun through a cold air return, but as far as i know, you cannot run the length of a duct. Also, for the 220,  should I use 6/3 with an insulated ground?

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Dave’s Reply:
Thanks for your electrical question Mike.

See:  NEC 300.22 Wiring in Ducts, Plenums, and Other Air-Handling Spaces.

The wire size must be increased due to the length of the run.
The wire MUST be Copper.

The Following links will assist you with your electrical question:

Wire Size – Voltage Drop Calculator

220 Volt Wiring Diagram

Electrical Grounding

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