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#174010 - 01/24/08 08:22 PM High voltage?
leland Offline
Member

Registered: 08/20/07
Posts: 856
Loc: Lowell area, Ma. USA
Hi All,I know we have some HV and utility guys here so I thought I would ask.
I was doing a PM today on some equipment (unrelated), when I took a look at a G&W 4 POSITION SWITCH. 2300v.
I noticed the cables in the 4" conduit. They are terminated and bonds are all made up and bonded to the G&W cabinet. Fine.
My question is: should the the conduits be bonded to the cab aswell? Now the cables just come out of the pipe with no fittings.I thought it strange/odd there was no bond to the conduits.

Thanx, Lee

(I can post pics)

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#174015 - 01/25/08 12:54 AM Re: High voltage? [Re: leland]
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Hi Lee,
There might need to be some testing done before the work was completed.
Likes of a Hi-Pot test or what-ever.
The reason the terminations are made like that before all the mechanical stuff is finished is pure economics, maybe the test technician could only be at that site at that time.
Sure, we would all like to have things finished, I've tested work in sub-stations here where the engineering part has not been completed, but is safe.
Commissioning HV gear is in itself a long slow process.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin

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#174057 - 01/25/08 04:23 PM Re: High voltage? [Re: Trumpy]
Yoopersup Offline
Member

Registered: 03/04/03
Posts: 826
Loc: Michigan
If HV cable Shields bonded both ends cable must be derated
310.60 (C) 1
Conduits must be bonded as usual

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#174077 - 01/25/08 07:48 PM Re: High voltage? [Re: Yoopersup]
leland Offline
Member

Registered: 08/20/07
Posts: 856
Loc: Lowell area, Ma. USA
AAAARGGG. I'm so stupid!!!!!
I'll try to post a pic of my question.

Thanks folks, It must be hard to determine what "morons" like me ask.

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#174080 - 01/25/08 08:40 PM Re: High voltage? [Re: leland]
JCooper Offline
Member

Registered: 12/30/02
Posts: 229
Loc: Kendall Park, NJ USA
I think what leland is trying to say is the hv cables come in and are terminated as usual, but the conduit they are in has no connector on it and is not bonded to the cabinet.

Did I get that right?

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#174086 - 01/26/08 05:46 AM Re: High voltage? [Re: JCooper]
leland Offline
Member

Registered: 08/20/07
Posts: 856
Loc: Lowell area, Ma. USA
Perfect!

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#174097 - 01/26/08 12:02 PM Re: High voltage? [Re: leland]
RODALCO Offline
Member

Registered: 12/08/05
Posts: 863
Loc: Titirangi, Akld, New Zealand
The conduit you mean is the screen of the cable ?

Most HV cables have a armour and a screen around the 3 core cable or a screen around each individual core.

A photo would be nice.
_________________________
The product of rotation, excitation and flux produces electricty.

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#174098 - 01/26/08 01:23 PM Re: High voltage? [Re: RODALCO]
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Here's the picture:

_________________________
Let's face it, these days if you're not young, you're old - Red Green grin

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#174111 - 01/26/08 06:59 PM Re: High voltage? [Re: Trumpy]
leland Offline
Member

Registered: 08/20/07
Posts: 856
Loc: Lowell area, Ma. USA
Thanks for the photo Mike.

Basicaly behind the sheet metal cover, all the boots are made up and the sheilds terminated and bonded to the frame.
However the conduits are not bonded to the frame (just filled with sealant to keep the water from man holes out).
I would think they should be.

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#174131 - 01/27/08 07:22 AM Re: High voltage? [Re: leland]
Yoopersup Offline
Member

Registered: 03/04/03
Posts: 826
Loc: Michigan
Try 250.190 2005 nec

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