Thermostat wiring for line voltage

[Ed Thompson]

I was on a job the other day on a service call ,and noticed that the customer had a Generac generator installed with an automatic transfer switch several years before and noticed the electrical contractor that did the installation used 2 -sets of 18-3 thermostat wire between the generator and transfer switch ,terminals N1 and N2 are 240v and fused at 5 amps the wire were run exposed from the the generator to the transfer switch exposed through the basement, the thermostat wire is a class 2 power limited cable and the insulation is rated at 300v ,i would never think of using that wire for anything but low voltage ,but is it legal ?

 

[petersonra]

I was on a job the other day on a service call ,and noticed that the customer had a Generac generator installed with an automatic transfer switch several years before and noticed the electrical contractor that did the installation used 2 -sets of 18-3 thermostat wire between the generator and transfer switch ,terminals N1 and N2 are 240v and fused at 5 amps the wire were run exposed from the the generator to the transfer switch exposed through the basement, the thermostat wire is a class 2 power limited cable and the insulation is rated at 300v ,i would never think of using that wire for anything but low voltage ,but is it legal ?

It might be that this is a class 1 circuit. If so, I think the cabling might be OK but it should be in a raceway of some sort.

 

[hbiss]

Assuming it was a class 1 circuit, a CL2 listed cable even in conduit isn't a chapter 3 wiring method.

-Hal

 

[kwired]

It might be that this is a class 1 circuit. If so, I think the cabling might be OK but it should be in a raceway of some sort.

It is a class 1 circuit, but you still can not use cable identified only as CL2.

 

[petersonra]

It is a class 1 circuit, but you still can not use cable identified only as CL2.

if i recall, the code just says it has to be a listed cable.

 

[kwired]

if i recall, the code just says it has to be a listed cable.

It probably is listed, but not for class 1 circuits.

 

[hbiss]

if i recall, the code just says it has to be a listed cable.

Yes. Listed like UF is.

-Hal

 

[Ed Thompson]

Honeywell 18-3 thermostat 4711 has a CL2 stamp on it