Distance requried between telecommunication cables& Power cables

[elecman72]

hi to all

Pls , i would like to know the required distance between telecommunication cables & power cables according to NEC , ANSI

Regards

 

[e57]

The ANSI TIA/EIA used to be much more picky on the distance in their standards - the NEC much less so.

See page 6 of 7:
http://www.anixter.com/AXECOM/AXEDocLib.nsf/(UnID)/4A3D75718E44B97886257309005729A9/$file/ANSI-TIA-EIA-569-B.pdf

It still is 800.52 in the code I think? (It may have changed depending on cycle you're on?)

 

[elecman72]

thx

thx

Thx e57

i have this article ,, but it doesnt give me the required distance from transformers , motors .........................................................................( Similarly, telecommunications cabling is routed
away from large motors, generators, induction heaters, arc welders, x-ray
equipment and radio frequency, microwave or radar sources )

it just mentioned away , if 1 m is enough or need more


thx

 

[e57]

1 meter is roughly 3 feet right? :grin: Anyway it would depend on the voltage and EMF/RF noise of the circuit. Of course those type things like transformers and motors with cause more EMF - and more so at higher voltages - but not really spelled out in many places. In either the NEC or ANSI - the further the better would be best beyond 5" for 2000 watts, and 2' at 5kVA. The 02 NEC says only 2" in 800.52(A)2... I call that a judgement call....

 

[elecman72]

thx alot e57

 

[iwire]

How close to motors and transformer would you run communication circuits without them being in metal raceways?

 

[e57]

How close to motors and transformer would you run communication circuits without them being in metal raceways?

Slightly closer - but since no distance is really given - still a judgement call - but avoidance is best.... Nothing like a hummy phone line....

 

[elecman72]

Communication cables will be in metal racway sure , but there is a distance required to be away from transformers or motors ,

 

[Buck Parrish]

Try these articles,
Also their may be help full answers to your other thread about grounding of telecomunications and IT

08 NEC ART's 725 - 760 - 770 - 800 - 820 - 830