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Author Topic: 110 Circuit in the same under ground PVC as Coax to tower  (Read 525 times)

NT6U

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Re: 110 Circuit in the same under ground PVC as Coax to tower
« Reply #15 on: October 25, 2021, 09:20:07 AM »

The NEC (which most inspectors follow) does not permit the mixing of low voltage and high voltage cables in the same conduit.
Understood and agree. 
Thank you
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KM4AH

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Re: 110 Circuit in the same under ground PVC as Coax to tower
« Reply #16 on: November 01, 2021, 03:56:51 AM »

I placed a 500 foot run of four number 6 USE conductors, an RG 8 direct burial coax that splits off at about 300 feet and up an 80 foot pole, and an empty run of 2 inch P&C Flex in the same trench. The P&C Flex went to the pole.
After about 15 years the sun had worked on the direct buried coax where it came up the pole. So, I put an idler pulley on the side of the pole with a lag bolt and pulled a run of LMR 400 with a four wheeler through the empty conduit.

Anyhow, I never even thought about any conflict between the two 120's in the same trench as the coax. It was all wrapped together.
Never any problem.
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NT6U

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Re: 110 Circuit in the same under ground PVC as Coax to tower
« Reply #17 on: November 01, 2021, 01:25:54 PM »


Anyhow, I never even thought about any conflict between the two 120's in the same trench as the coax. It was all wrapped together.
Never any problem.
Thanks for sharing your experience & I'm glad it worked flawlessly for you.
I have learned so far that I should not run DC low voltage (rotator cable) in the same conduit as the the 110V +/- AC circuit due to {A} safety concerns.  A short in the AC voltage circuit may energize the low voltage cable & unsuspecting person may be caught off guard.  Same for a coax.  {B} There may be harmonics so- I'm told by an electrician, that the ac circuit may not play well next to a DC circuit.  Sooooo

My old school motto at work comes into play here.   Do a job big or small-Do it right or not at all.
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