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Old 10-12-2012, 01:05 PM   #1
atm
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Breaker Size for a Sauna Heater


Planning to install a sauna heater with the following specifications:
5 KW
20.8 AMP
240 Volts

I have an existing 10/3 wiring that can be used to hook up the sauna heater to the Circuit breaker.

What amperage breaker size should I use for this connection?
Is a 10/3 cable sufficient for this type of sauna heater?

Appreciate your help!

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Old 10-12-2012, 01:59 PM   #2
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Breaker Size for a Sauna Heater


30 amp breaker on the 10/3 cable will be fine. The heater likely only uses two of the wires for 240 volts. Simply cap of the white wire and leave it in the box.

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Old 10-13-2012, 06:11 AM   #3
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Breaker Size for a Sauna Heater


Thank you.

What would be the effect if a 20 amp breaker was used?
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Old 10-13-2012, 06:51 AM   #4
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Breaker Size for a Sauna Heater


Does the manufacturer's installation instructions say which size and type of breaker to use?
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Old 10-13-2012, 11:04 AM   #5
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Breaker Size for a Sauna Heater


No it does specify any breaker size. I was just wondering what happens if 20 amp breakers are used?
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Old 10-13-2012, 11:10 AM   #6
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No it does specify any breaker size. I was just wondering what happens if 20 amp breakers are used?
They will trip.
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Old 10-13-2012, 12:05 PM   #7
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They will trip.
Unlikely at 20.8 amps.
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Old 10-13-2012, 12:14 PM   #8
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Unlikely at 20.8 amps.
If it runs at 20.8 I would suspect it would trip. If it occasionally hits 20.8 then I suspect it will not.
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Old 10-13-2012, 02:36 PM   #9
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If it runs at 20.8 I would suspect it would trip. If it occasionally hits 20.8 then I suspect it will not.
It would never trip at 20.8 amps...

The UL standard permits an OCPD to carry 134% of the device rating forever. It has to trip in no more than 60 minutes for 135% load.
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Old 10-13-2012, 03:23 PM   #10
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Breaker Size for a Sauna Heater


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It would never trip at 20.8 amps...

The UL standard permits an OCPD to carry 134% of the device rating forever. It has to trip in no more than 60 minutes for 135% load.
Does that mean it would need 26.80 amps before it would trip?
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Old 10-13-2012, 03:24 PM   #11
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Does that mean it would need 26.80 amps before it would trip?
Maybe, maybe not, depends on the actual trip curves of the manufacture, but, this is how UL tests a molded case breaker.
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Old 10-13-2012, 07:37 PM   #12
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Depends on the breaker. I would NEVER put a known 20.8 amp load on a 20 amp breaker.
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Old 10-13-2012, 08:02 PM   #13
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Depends on the breaker. I would NEVER put a known 20.8 amp load on a 20 amp breaker.
Neither would I, and that was never my intent, I was just sharing the true facts of UL standards.

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