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)

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.

If HV cable Shields bonded both ends cable must be derated
310.60 (C) 1
Conduits must be bonded as usual

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.

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?

Perfect!

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.

Here's the picture:

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.

Try 250.190 2005 nec

Just ductseal in the conduits?
2005 NEC RMC



So if it doesn't ENTER the box, fitting, or other enclosure, this doesn't apply??

I agree with Yoopersup. Regardless of any HV specific clauses, 250.190 requires any metal that's likely to become energized must be bonded to the building ground, which implicitely requires the cabinet and conduits be bonded to a common point.