Distance between MV cables and Fiber Optic Cables

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sameriek

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Hi guys .

A couple of days ago i posted the same thread but i didn't get any reply. I am a new member here so maybe it didn't get posted.

If someone has the knowledge, please let me know.

We are laying MV cables (15 KV) (armored cu /xlpe) in an open trench.

Adjacent (parallel) to it, we are laying fiber optic cables (non-metallic direct buried type).

Is there any standard that specifies the minimum distance between these 2 cables based on the fact that Fiber Optic cables are not affected by any EMI that could be generated by the adjacent MV cable.
and Can i lay them in the same trench ?

Thank you
 
sameriek said:
Hi guys .

A couple of days ago i posted the same thread but i didn't get any reply. I am a new member here so maybe it didn't get posted.

If someone has the knowledge, please let me know.


Thank you
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We're not ignoring you - but both together is not my normal range of knowledge - But the safe answer is no.... If there were a wire strength member, sheilding or foil as some fiber cables have - it could become a danger. Assuming this is a long run?
 
sameriek said:
Adjacent (parallel) to it, we are laying fiber optic cables (non-metallic direct buried type).
Click to expand...


If the complete cable is non metallic, I dont see a problem, but if there is any metal in the FO, It could be induced with a charge due to running paralell to the HV cable.

~Matt
 
buckofdurham said:
Put the cable in the bottom. Put 12" of dirt on it then the fiber optic on top. Then fill the ditch up.
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I agree- they're really not even in the "same trench" then. Run a string of red plastic a few inches above the FO, "CAUTION BURIED CABLE" or something on it for the backhoe operator to see before he slices through the FO and then the MV...
 
I heard that the US Govt has a HV cable with FO in it, FO is easy to tap, but not in a HV cable.
NEC allows non conductive FO in the same raceway box or enclosure with power and lighting.
 
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