Does My Sauna Require A Dedicated Electrical Circuit?

Electrical Question from Mike about Wiring a New Sauna
Background: Mike, a Homeowner from Ontario Canada

Question: I am installing a sauna in my basement. I was hoping to use a power cable that ran to an old water heater – 30 amp breaker 2 wire 10 gauge. However the sauna heater is rated at 7.5kW and the voltage is 240 V. The heater unit is marked 31.2 amp. Can I use the existing cable or do I have to run #8 with a 40 amp breaker. The current cable runs behind a wall and would be a pain to replace.

Dave’s Reply:
Thanks for your electrical question Mike. The sauna will require a dedicated 240 volt 40 amp GFCI Protected Circuit installed according to applicable electrical codes. Take your time, but do it right. What a great opportunity to do something different! Besides, just think how great it’s going to feel soaking away and knowing you did it right!

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Home Electrical Wiring and Electrical Repairs 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.

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