Control and Power cable separation...

[scadaman]

What is a good rule of thumb for separation of a 4-20mA analog signal from 480V power cable? I have a location where we need to run both overhead on the same poles. The NEC just gives minimum (safety) distances...I am concerned with crosstalk--we are runnning shielded, armored cable, and I am looking for a "safe" parallel distance (could put one 6" below the other, for example)

Thanks

 

[stickelec]

Since both are "Armored and Shielded", and if properly grounded, I don't see a noise problem on the Analog cable. No different then running them in separate RGC or EMT.

 

[stickelec]

I ran into something you should consider regarding spacing. I know the Analogs are not communications but I thought you might want to take a look.

http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=10705#1926.404(b)(1)(ii

1926.404(c)(1)(i)