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Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums => Lighting Forum => Topic started by: David Allred on May 02, 2019, 12:05:19 pm

Title: Power and DMX feeds in the came conduit / cable
Post by: David Allred on May 02, 2019, 12:05:19 pm
Every where I read that this is a no-no, but I found this from how Acclaim Lighting specs their wiring.
As a reference, they exterior lit the Mercedes Benz dome in ATL.
I really want to run my Shielded Cat5e cable in the conduit with the power runs.

Explanations?

Title: Re: Power and DMX feeds in the came conduit / cable
Post by: Cailen Waddell on May 02, 2019, 12:16:02 pm
Portable cable is not the same thing as install.  Install jumpers arenít cables pulled in conduit. 


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Title: Power and DMX feeds in the came conduit / cable
Post by: Rob Spence on May 02, 2019, 12:19:01 pm
The issue you face is simply having your DMX cable meet the same insulation spec as the power cable.  It is likely that if you purchase DMX cable with appropriate cable jackets then you can run them together. You still have to separate the DMX from the power at the ends as once you strip the external jacket to terminate, you might no longer meet the insulation requirements for a common enclosure. You canít just use random DMX cable.

Of course, even after you meet the NEC requirements, you still must meet the requirements of the local AHJ (Authority Having Jurisdiction - aka, electrical inspector).

In your example, they used cable manufactured for their purpose. I am sure all the conductors, or at least the 3 sets, were all insulated to 600 V since they mention use at 277v.

Edit to talk about example

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Title: Re: Power and DMX feeds in the came conduit / cable
Post by: Erik Jerde on May 03, 2019, 01:35:21 am
Manufactured, tested, listed assemblies donít have to meet (in the USA) NEC requirements.  If you open up an appliance thatís rated to draw 240V/50A you will (in my experience) find much smaller conductors than NEC requires for building wire.  Thatís because the mfgr has done all the work to make sure itís safe as designed for the intended application.
Title: Re: Power and DMX feeds in the came conduit / cable
Post by: David Allred on May 04, 2019, 11:14:13 am
So the cable exits, but not sold to the end user?  They make jumpers to connect lights, that can't  be run through conduit, but don't know the separation needed.  Why don't they sell the raw cable, or at least offer where to get it?
Title: Re: Power and DMX feeds in the came conduit / cable
Post by: Erik Jerde on May 04, 2019, 03:17:21 pm
So the cable exits, but not sold to the end user?  They make jumpers to connect lights, that can't  be run through conduit, but don't know the separation needed.  Why don't they sell the raw cable, or at least offer where to get it?

I found the connectors with no problem.  I wouldnít be surprised if the cable is available through the same dealer, but the website is hard on mobile so I didnít look.