ELECTRICAL LIGHTING CABLE AND COMMUNICATIONS CABLE IN THE SAME BURIED CONDUIT

[JM1961]

Usually, communications cable is not installed in thesame conduit as electrical lighting cable in order to avoid interference with thecommunication signal. However, do theexceptions listed in NEC 2005 Article 830.47 permit electrical lighting cableand communications cable to be buried in the same conduit if the communicationscable has metal armor and is grounded?

 

[petersonra]

Usually, communications cable is not installed in thesame conduit as electrical lighting cable in order to avoid interference with thecommunication signal. However, do theexceptions listed in NEC 2005 Article 830.47 permit electrical lighting cableand communications cable to be buried in the same conduit if the communicationscable has metal armor and is grounded?

Before you worry about that take a look at 830.1 and make sure that what you are asking about is actually applicable to your situation. You may not have a Network-Powered Broadband Communications System which is what this article covers.

 

[JM1961]

Before you worry about that take a look at 830.1 and make sure that what you are asking about is actually applicable to your situation. You may not have a Network-Powered Broadband Communications System which is what this article covers.

The communication cable is CAT6 and connects a telephone in one building to a switch in another nearby building. The scope of 830.1 covers network-powered broadband communications systems that provide any combination of voice, audio, video, data and interactive services through a network interface. Since the network switch provides an audio signal, can we agree article 830 applies?

 

[GoldDigger]

Is this a private exchange or part of a common carrier's network?
There are arguments that strictly local facilities (with a local power source) are not covered.

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[JM1961]

Is this a private exchange or part of a common carrier's network?
There are arguments that strictly local facilities (with a local power source) are not covered.

Sent from my XT1585 using Tapatalk

This is a private exchange.

 

[hbiss]

The communication cable is CAT6 and connects a telephone in one building to a switch in another nearby building. The scope of 830.1 covers network-powered broadband communications systems that provide any combination of voice, audio, video, data and interactive services through a network interface. Since the network switch provides an audio signal, can we agree article 830 applies?

Noooo. Network powered broadband is (as an example) cable TV that uses a modem or EMTA in or on the house that is powered through the cable coming in from the pole by the cable company.

The communication cable is CAT6 and connects a telephone in one building to a switch in another nearby building.

There is a great deal of debate as to what article covers phone wiring. Depending on how you interpret the NEC it is either 725 or 800. I lean towards 800 but in your case it doesn't matter.

You have it backwards but you are close. Pull a listed cable (like UF) instead of individual conductors for the line voltage. Then you can pull any LV cable you want- preferably one listed for direct burial because this is a wet location.

And it has nothing to do with interference.

-Hal

 

[JM1961]

Noooo. Network powered broadband is (as an example) cable TV that uses a modem or EMTA in or on the house that is powered through the cable coming in from the pole by the cable company.



There is a great deal of debate as to what article covers phone wiring. Depending on how you interpret the NEC it is either 725 or 800. I lean towards 800 but in your case it doesn't matter.

You have it backwards but you are close. Pull a listed cable (like UF) instead of individual conductors for the line voltage. Then you can pull any LV cable you want- preferably one listed for direct burial because this is a wet location.

And it has nothing to do with interference.

-Hal

Does the line voltage cable have to be grounded or armored?

If it has nothing to do with interference, why does article 830.47 (A) and (B) include separation requirements? What is the point of having the separation if it is not to avoid interference?

 

[GoldDigger]

If it has nothing to do with interference, why does article 830.47 (A) and (B) include separation requirements? What is the point of having the separation if it is not to avoid interference?

So that you don't hit them both with one stroke of your shovel and short them together when digging?



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[hbiss]

Does the line voltage cable have to be grounded or armored?

If it has nothing to do with interference, why does article 830.47 (A) and (B) include separation requirements? What is the point of having the separation if it is not to avoid interference?

The NEC couldn't care less about interference, they only care about protecting lives and property. If somebody thinks there may be an interference issue it's up to them to do what ever they feel is necessary to eliminate it. And for the record there shouldn't be any.

Does the line voltage cable have to be grounded or armored?

You use whatever cable is suitable for the application. Obviously it would include a ground conductor.

You give us no information as to what size feeder this will need to be.

-Hal