Low Voltage Conduit - Insulation Requirements

[WayneSeroka]

Is it permissible to mix 300 volt insulation and 600 volt insulation cables in the same conduit, if all cables and conductors are low voltage (24V AC and less) or communications (shielded) ?

The conduit in question is between two cabinets where the maximum voltage present is 115vac.

 

[charlie b]

Yes. See 300.3(C)(1) for a restriction on the conductors' insulation systems.

 

[WayneSeroka]

Thank you very much

 

[tom baker]

Probably yes. Low voltage is not an NEC term, but you can mix limited energy such as telephone, cable and computer wiring, the low voltage if DC< would be an Art 725 Class 2 or 3 application. However you could have a low voltage system that is not current limited, such as a DC battery.
We use the term Low Voltage, but there have been cases of low voltage causing fires.