Latest Discussions : Electrical & Lighting

BV025730

11:09AM | 07/31/21
Hi, I’m installing a 6kw Harvina Sauna Heater with 240v.
This heater requires 10/2 wire and a 30 amp breaker.

I have two questions:

#1. My garage has a 240v circuit breaker (80’ from main panel) with Aluminum 8AWG RHH or RHW on a 40amp main breaker. I know Aluminum has a lower conductivity rating vs Cooper. Is this ok for a 6kw heater?

#2. From my Garage panel, per the instructions I plan to run 10/2 copper on a 30amp breaker - this will run 45, between breaker and heater. Do I need to upgrade to 8/2 copper?

Thanks,
Nick

BV025805

02:29PM | 08/13/21
The #8 aluminum feeding the garage is already too small to supply 40 amps at that distance without exceeding allowable voltage drop.
And adding 45 feet of copper #10 adds even more voltage drop which will be over 3% drop at the 6KW sauna with a voltage of about 230 Volts remaining if you start with 240 at the main panel.

So even if you run nothing at all but the sauna you are already right to the allowable voltage drop limit.

You would need at least a #6 aluminum to supply 40 amps to the garage.




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