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High voltage? #174010
01/24/08 11:22 PM
01/24/08 11:22 PM
L
leland  Offline OP
Member
Joined: Aug 2007
Posts: 853
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)

Work Gear for Electricians and the Trades
Re: High voltage? [Re: leland] #174015
01/25/08 03:54 AM
01/25/08 03:54 AM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,253
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.

Re: High voltage? [Re: Trumpy] #174057
01/25/08 07:23 PM
01/25/08 07:23 PM
Y
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 849
Michigan
If HV cable Shields bonded both ends cable must be derated
310.60 (C) 1
Conduits must be bonded as usual

Re: High voltage? [Re: Yoopersup] #174077
01/25/08 10:48 PM
01/25/08 10:48 PM
L
leland  Offline OP
Member
Joined: Aug 2007
Posts: 853
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.


Re: High voltage? [Re: leland] #174080
01/25/08 11:40 PM
01/25/08 11:40 PM
J
JCooper  Offline
Member
Joined: Dec 2002
Posts: 228
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?

Re: High voltage? [Re: JCooper] #174086
01/26/08 08:46 AM
01/26/08 08:46 AM
L
leland  Offline OP
Member
Joined: Aug 2007
Posts: 853
Lowell area, Ma. USA
Perfect!

Re: High voltage? [Re: leland] #174097
01/26/08 03:02 PM
01/26/08 03:02 PM
R
RODALCO  Offline
Member
Joined: Dec 2005
Posts: 856
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.
Re: High voltage? [Re: RODALCO] #174098
01/26/08 04:23 PM
01/26/08 04:23 PM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,253
SI,New Zealand
Here's the picture:

[Linked Image]

Re: High voltage? [Re: Trumpy] #174111
01/26/08 09:59 PM
01/26/08 09:59 PM
L
leland  Offline OP
Member
Joined: Aug 2007
Posts: 853
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.

Re: High voltage? [Re: leland] #174131
01/27/08 10:22 AM
01/27/08 10:22 AM
Y
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 849
Michigan
Try 250.190 2005 nec

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