Optical Fiber vs 13.2kV

[Sprag-O]

Good morning,

I've been pouring through the NEC regs for non-conductive communications cable (Fiber) and High voltage raceways, but haven't found anything stating this can/can't done.

I have a comm path prone to freezing, and this year it has taken out one of my SMF feeds to the university. I'm pricing out an alternative path, but do currently have one available I could utilize.
The issue is it's part of my 13.2kV feeder between buildings. I technically have separate raceways (only 1 of 6 6" conduits are in use) but I need to traverse two high voltage vaults between the buildings, and exit the HV enclosures.

770.133 and 620.36 I believe state I can run fiber along side conductors <600v, but this is a different case.

Would 15kV rated innerduct from point A-B traversing the vaults and all HV spaces be considered a separate race, and as such allow this by code?

Thank you for your knowledge,
Travis

 

[tom baker]

Non conductive fiber can be run in the same enclosure box or raceway as power and lighting conductors, I found this section a while ago and it was hard to find, its late and I will look for it tomorrow
I have heard that for sensitive data the fiber is run inside HV cables so the fiber can't be tapped.

 

[Sprag-O]

I had only seen fiber in the same raceway for under 600/1000v.

If there's nothing that states this can't be done, I'll look into installing rated duct so we never have to get in the holes again.

Thank you.

 

[Fulthrotl]

I had only seen fiber in the same raceway for under 600/1000v.

If there's nothing that states this can't be done, I'll look into installing rated duct so we never have to get in the holes again.

Thank you.

if you were to use orange innershield, and run it
unbroken thru the vaults, and pull nonconductive
fiber thru it, i don't see a problem with it, from
a common sense perspective. the innershield will
keep you from having to have repeated access of
the underground substructures, as you say.
i'd put in a couple extra innerducts, while i was at
it. you never know......

LADWP put their SCADA backbone in that way.
they didn't use innershield, they used a compressor
and a traction device to shove the 1/2" diameter cable
thru 3" pvc, up to 16,000' at a time.

the air fluttered a pushing head, and the cable in the pipe,
jiggling it, and allowing it to keep moving.