conductors of different voltage in same conduit

[PatV]

Installed a generator. The wires from the generator to the transfer switch have 120/240 volt circuit to monitor power, plus two 12 volt DC wires that give generator a start command. Can these conductors be installed in the same conduit if they all have 600 volt insulation. Can they be in the same conduit with the power conductors feeding power to the transfer switch. My inspector says I cannot install in the same conduit per 725.136. On the generators that come with a pigtail installed on the generator at the factory all of the wires are in the same conduit. If we need to extend them our inspector is requiring two conduits leaving the the j box.
Pat

 

[Dennis Alwon]

The inspector could be correct but it depends on the class rating of the transformer in the generator. Around here that install was done often with one conduit. Now we use 2 conduits to avoid this issue

 

[don_resqcapt19]

I would not expect that circuit to be a Class 2 control circuit as they likely have used the generator batteries as the power source for the control circuit (the use of the batteries as the control circuit power would likely result in a Class 1 control circuit which can be mixed with associated power circuits), but you would have to look at all of the details in the generator instruction manual.

 

[infinity]

Installed a generator. The wires from the generator to the transfer switch have 120/240 volt circuit to monitor power, plus two 12 volt DC wires that give generator a start command. Can these conductors be installed in the same conduit if they all have 600 volt insulation. Can they be in the same conduit with the power conductors feeding power to the transfer switch. My inspector says I cannot install in the same conduit per 725.136. On the generators that come with a pigtail installed on the generator at the factory all of the wires are in the same conduit. If we need to extend them our inspector is requiring two conduits leaving the the j box.
Pat

What's the make and model number of the generator?

Welcome to the Forum.

 

[Dennis Alwon]

I would not expect that circuit to be a Class 2 control circuit as they likely have used the generator batteries as the power source for the control circuit (the use of the batteries as the control circuit power would likely result in a Class 1 control circuit which can be mixed with associated power circuits), but you would have to look at all of the details in the generator instruction manual.

I have seen generators that required separate conduits but that may not be a code issue Idk. Generac used to say 1 conduit was all that was necessary but since I have work with gens in awhile I am not sure if that has changed