Cat5e & Power Conductors in the same raceway

[superdave02]

2023 NEC Article 724.48 A - Reads maximum voltage of any conductor. So, the maximum voltage to ground or phase to phase? I am installing a Big Ass Fan, 480V, and want to install the Cat5 control wiring in the same EMT.

 

[don_resqcapt19]

You need to be looking at 725.136.

 

[superdave02]

I see. So, the Cat5 going to the controller is Class 2 wiring and not permitted in the same raceway without a barrier.

 

[don_resqcapt19]

I see. So, the Cat5 going to the controller is Class 2 wiring and not permitted in the same raceway without a barrier.

It is either covered by 725 or 805. In my opinion it is 725, but the rules in those articles are identical as far as mixing with power.

 

[herding_cats]

The noise/bleed from anything over 50 vac will effect cat5/6. Do not run them in parallel with high voltage (50 vac and above) whether it's Romex in a home, or inside EMT or greenfield. Run EMT and zip tie the cat5/6 to the outside of the EMT. Putting 480vac in parallel next to cat5/6 com wire you can be guaranteed it will not function for the communications end. Might even damage a converter or board. .