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#90297 - 11/13/04 06:15 AM 15kv cable conduit fill
trekkie76 Offline
Member
Registered: 06/19/04
Posts: 220
Loc: baileyville, maine, usa
Can anyone tell me where I can find dimentsions for 15kv concentric neutral cable? Customer wants it in pipe. It looks like a 500 kcmil cable, but there must be a place in the code book with the measurements for it. any help would be appreciated. Thanks, Gary
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#90298 - 11/13/04 06:22 AM Re: 15kv cable conduit fill
trekkie76 Offline
Member
Registered: 06/19/04
Posts: 220
Loc: baileyville, maine, usa
I found it
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#90299 - 11/13/04 07:05 AM Re: 15kv cable conduit fill
CharlieE Offline
Member
Registered: 04/23/04
Posts: 200
Loc: Indianapolis
It is not recommended to put concentric neutral cable in conduit, it is intended to be direct buried. If you wish to put it in conduit, get jacketed concentric neutral cable. Over the years, we have bad performance from concentric neutral cable in conduit.

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Charlie Eldridge, Indianapolis, Utility Power Guy
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Charlie Eldridge, Indianapolis Utility Power Guy
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#90300 - 11/14/04 07:18 AM Re: 15kv cable conduit fill
trekkie76 Offline
Member
Registered: 06/19/04
Posts: 220
Loc: baileyville, maine, usa
charlie, what performance problems ? We are going to put it in PVC. What do you mean by jacketed, I tought it already had a jacket on it(Black jacket with pinkish insulation inside)? It is listed for direct burial, but the customer wanted it in pipe. If we bury it without pipe, still would need a riser. Would this hurt the wire also? Always good to get advice from the other side of the fence.Thanks, Gary
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#90301 - 11/14/04 07:12 PM Re: 15kv cable conduit fill
CharlieE Offline
Member
Registered: 04/23/04
Posts: 200
Loc: Indianapolis
We have put miles of cross-linked solid dielectric bare concentric neutral in the earth with some in PVC conduit. We have had a lot of failures with the cable in the conduit. We quit using the bare concentric neutral and went to a polyethylene jacket over the concentric neutral cable and have had no trouble with the jacketed concentric neutral cable.

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Charlie Eldridge, Indianapolis, Utility Power Guy
_________________________
Charlie Eldridge, Indianapolis Utility Power Guy
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#90302 - 11/18/04 05:48 PM Re: 15kv cable conduit fill
Nick Offline
Member
Registered: 08/13/01
Posts: 599
Loc: Riverside, CA
Charlie,
Did you ever pin point why the cable was failing? The utilities here run it in PVC all the time.
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#90303 - 11/18/04 07:11 PM Re: 15kv cable conduit fill
CharlieE Offline
Member
Registered: 04/23/04
Posts: 200
Loc: Indianapolis
I seem to remember a problem with arcing between the concentric neutral conductors and the outside of the cable.
_________________________
Charlie Eldridge, Indianapolis Utility Power Guy
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