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Author Topic: Installed Wiring  (Read 3593 times)

Hal Bissinger/COMSYSTEC

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Re: Installed Wiring
« Reply #10 on: August 17, 2008, 12:54:47 am »

I was suggesting following the code requirements for cable fill and not that it would be a code violation to not follow them, in this case that is two different things but I can see it being confused.

If fill was a code requirement, not following it would be a code violation. Smile

As Don points out there is no NEC code requirement for communications cable fill. The NEC is only concerned with safety issues, not design or operational issues. Whether or not you can pull a communications cable through a conduit without damaging it is not an issue that impacts the life and safety of the building occupants or the safety of the property.

The place to look for fill requirements is the manufacturer of the cable you are using. Size of the cable is not the only consideration when determining cable fill. As has been noted the jacket material and the conduit itself play a role as does the amount of pulling tension the cable can safely withstand. Don't be tempted to do what sparkie does, that is use the code fill table for an equivalent sized THHN wire.

-Hal

Duane Massey

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Re: Installed Wiring
« Reply #11 on: August 17, 2008, 03:07:53 am »

Amen, Hal...
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Duane Massey
Houston, Texas, USA

Robert Sims

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Re: Installed Wiring
« Reply #12 on: August 19, 2008, 01:26:44 am »

Glen,
You may want to put a meter on the conduit. It's not uncommon to see conduit energized with power circuits installed, especially when they travel close or use common support hardware with audio conduits.

But it does sound like it may be grounding for the hum.  
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Robert Sims

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