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-   -   Breaker Size for a Sauna Heater (http://www.diychatroom.com/f18/breaker-size-sauna-heater-159844/)

atm 10-12-2012 01:05 PM

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!

joed 10-12-2012 01:59 PM

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.

atm 10-13-2012 06:11 AM

Thank you and question
 
Thank you.

What would be the effect if a 20 amp breaker was used?

Billy_Bob 10-13-2012 06:51 AM

Does the manufacturer's installation instructions say which size and type of breaker to use?

atm 10-13-2012 11:04 AM

No it does specify any breaker size. I was just wondering what happens if 20 amp breakers are used?

k_buz 10-13-2012 11:10 AM

Quote:

Originally Posted by atm (Post 1030008)
No it does specify any breaker size. I was just wondering what happens if 20 amp breakers are used?

They will trip.

stickboy1375 10-13-2012 12:05 PM

Quote:

Originally Posted by k_buz (Post 1030011)
They will trip.

Unlikely at 20.8 amps.

k_buz 10-13-2012 12:14 PM

Quote:

Originally Posted by stickboy1375 (Post 1030052)
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.

stickboy1375 10-13-2012 02:36 PM

Quote:

Originally Posted by k_buz (Post 1030062)
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.

sublime2 10-13-2012 03:23 PM

Quote:

Originally Posted by stickboy1375

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?

stickboy1375 10-13-2012 03:24 PM

Quote:

Originally Posted by sublime2 (Post 1030151)
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.

joed 10-13-2012 07:37 PM

Depends on the breaker. I would NEVER put a known 20.8 amp load on a 20 amp breaker.

stickboy1375 10-13-2012 08:02 PM

Quote:

Originally Posted by joed (Post 1030263)
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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