> >
>

Cable size for sauna heater

#1
10-10-18, 10:18 AM
Member
Join Date: Mar 2015
Location: Switzerland
Posts: 28
Cable size for sauna heater

I tried to calculate the cable size I need based on online calculators, but I'm still confused with the drop percentage and some other variables.

I need to connect an electric sauna stove as follows:

- 3-phased
- The stove can deliver up to 6KW
- The cable will not be in a wall, just in open air
- 15m long (50 ft)

Should I go for 1.5mm or 2.5mm?

Thanks

#2
10-10-18, 10:42 AM
Member
Join Date: Feb 2006
Location: USA
Posts: 6,769
We need to know voltage to calculate amperage. Once we know amperage, we can size the cable.

#3
10-10-18, 12:00 PM
Member
Join Date: Mar 2015
Location: Switzerland
Posts: 28
Voltage is 380V (I guess that means 400V)

#4
10-10-18, 09:18 PM
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 61,843
1.5mm wire = our #16 awg wire which is capable of handling 10A.
2.5mm wire = our #14 awg wire which is capable of handling 15A.

Here in the States #14 is the minimum wiring size we can use.

By my calculations...... that heating unit will require approx 9.2A per leg.
I'd recommend using the larger wire.

#5
10-12-18, 04:07 AM
Member
Join Date: Mar 2007
Location: Norway
Posts: 319
For such short run you will not have to calculate 1.5 mm2 max 10 A breaker. If it is hot where the cables run e.g. inside the sauna, you may consider 2.5 mm2.

Most European codes will say it is OK with 2.5 mm2 and 16A breaker, but 13A breaker will be plenty for the heater. You have to be shore about the if the cable is certified for the actual temperatures.

dsk