Mixing line and low voltage

[Nietz001]

I'm connecting a truck scale and the 120 volt wires and low voltage cat-5E cables are in the same underground raceway with no separation. I cannot find any insulation markings on the cat-5E but the line voltage is THHN 600 volt rating. I understand it is difficult to add a second conduit... is this even legal ?????
Jeff

 

[SparkyHC]

Take a look at NEC 300.3(C)(1)....
I think there is a good argument that this would apply.

 

[tom baker]

Take a look at NEC 300.3(C)(1)....
I think there is a good argument that this would apply.

Sorry, no look at the note to that section. You must have separation. Can you install LTNMC in the power conduit?

 

[mwm1752]

725.136 seems to refer to the class 2 & 3 jackets which are not rated. Maybe use the exception #2 to 725.130(A) & reclassify

 

[GoldDigger]

725.136 seems to refer to the class 2 & 3 jackets which are not rated. Maybe use the exception #2 to 725.130(A) & reclassify

Use 725.136 and 725.48 together with 725.130(A) if you can justify that the particular Cat 5E cable used meets Class 1 requirements.
You should be able to convince the AHJ that the wires are all "functionally associated" in this case.

 

[mwm1752]

So with 725.48 you may be able to use a 300V rating such as PLTC? I guess it boils down to how many conductors are needed for your Lo Volt install. OP has not define lo volt circuit classification which has been assumed as class2 or 3.

 

[Gregg Harris]

725.136 seems to refer to the class 2 & 3 jackets which are not rated. Maybe use the exception #2 to 725.130(A) & reclassify

Not yet but comming to you soon,`to be rated for wet location and probably 600 volt insulation.

 

[don_resqcapt19]

Unless the data in the low volage cables is in someway controlling the equipment that is served by the 120 volt circuit, I don't see these as being functionally associated. To me functionally associated is like having the motor stop start control wires in with the 3 phase power wires, that is there is a direct funtional association. I don't see that as the case here.

 

[GoldDigger]

Unless the data in the low volage cables is in someway controlling the equipment that is served by the 120 volt circuit, I don't see these as being functionally associated. To me functionally associated is like having the motor stop start control wires in with the 3 phase power wires, that is there is a direct functional association. I don't see that as the case here.

And yet the Class 2 or 3 wiring may be sensing as well as remote control. If you are able to successfully argue that only remote control can be functionally associated, while the sensor wires you use to decide what to do using the remote control function are not functionally associated, then there are a lot of non-compliant installations out there!

The underlying question is whether "functionally associated" means strictly "required to make it operate (function)", rather than "required to make it useful (functional)".
If there are local controls too, I will then assert that even the remote controls are not functionally associated, since the equipment can be made to run without them.