Underground HV cable & Communication separation distance

[laxmi]

Hi,
Is anyone can suggest me, what is the separation distance between underground HV cable and Communication cable? An existing communication duct is found across the new HV cable route whilst new trench is dug for HV cable laying. Is there any reference or literature that mention about the separation distance?
Regards,

 

[Spoon]

528.2 Proximity of communications cables


In the event of crossing or proximity of underground telecommunication cables and underground power cables, a

minimum clearance of 100 mm shall be maintained, or the requirements according to (i) or (ii) shall be fulfilled:

(i) A fire-retardant partition shall be provided between the cables, e.g. bricks, cable protecting caps (clay,

concrete), shaped blocks (concrete), protective cable conduit or troughs made of fire-retardant materials

(ii) For crossings, mechanical protection between the cables shall be provided, e.g. cable conduit, concrete

cable protecting caps or shaped blocks.

NOTE 1: Special considerations of electrical interference, both electromagnetic and electrostatic, may apply to telecommunication


circuits, data transfer circuits and the like.

NOTE 2: Segregation requirements for communications services are given in BS 6701 and BS EN 50174 series.

 

[soms]

Technically, HV circuits from a HV source are outside of the scope of BS7671, but the requirements above are clearly a good place to start.
If the cable is not for a private network and will be adopted by a DNO they should be able to advise on their specific requirements.
If you search online you will find trenching/cable installation guides from some of these companies showing depths and separation of cables/services.