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#82089 - 10/16/02 12:16 PM H.V. manhole grounding
yooper Offline
Junior Member

Registered: 08/26/02
Posts: 8
Loc: Michigan
Several circuits of 12470, running thru manholes, deadbreak elbows in junctions, metal ladder , metal cable supports,
Ground bar, two ground rods, all grounds and shields tied together.Sound Ok???

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#82090 - 10/16/02 01:57 PM Re: H.V. manhole grounding
electric-ed Offline
Member

Registered: 07/08/02
Posts: 184
Loc: Canada
Sounds like the kind of installation that should be engineered.
I would follow the specs and drawings.

Ed

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#82091 - 10/16/02 02:45 PM Re: H.V. manhole grounding
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
Omission of an {often} bare-copper conductor in the same raceway with the phase cables may accelerate damage {in fault situations} to the tape/drain-wire shield under the MV-cable jacket. The additional grounding conductor is routine, well-considered boilerplate for many.



[This message has been edited by Bjarney (edited 10-17-2002).]

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#82092 - 10/17/02 06:08 AM Re: H.V. manhole grounding
yooper Offline
Junior Member

Registered: 08/26/02
Posts: 8
Loc: Michigan
Guys
Theres two 500mcm in the concrete of the duct bank to each manhole and tied to the groundinging bar in each manhole. As far as designing eng. We;re it.

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#82093 - 10/17/02 12:56 PM Re: H.V. manhole grounding
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
Yoop—

Sounds like you've covered it thoroughly. Is someone complaining about a “deficiency”?

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#82094 - 10/17/02 02:41 PM Re: H.V. manhole grounding
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
Someone may be sniveling about expecting to see “IEEE std 837”-grade connections, but that's not an NEC or NESC requirement. [If it's specified in contract documents, that's a whole 'nother matter.]
http://www.fciconnect.com/products/technical_01_01_02.asp

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