HV & Control cable segregation

[aysohrab]

I appreciate your help.I'm installing an underground 11kv feeder (2KM long) and two control cables for the inter-trip send and receive signals from Multilin relays. What is the minimum segregation required between the two? I have seen some thing from 150mm to 1500mm? Could someone help please? Best Regards,

 

[davidbeach]

I'd look at using fiber optic for the transfer trip, then you won't have interference worries.

 

[aysohrab]

thanks davidbeach, I thought in this solution, but as I do not have good experience with such cable for protection, I prefer to use normal cable. The other thing of course is the cost?

 

[RajT]

In the petrochem industry we tend to specify 300mm min.