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H.V. manhole grounding #82089
10/16/02 02:16 PM
10/16/02 02:16 PM
Y
yooper  Offline OP
Junior Member
Joined: Aug 2002
Posts: 8
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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Re: H.V. manhole grounding #82090
10/16/02 03:57 PM
10/16/02 03:57 PM
E
electric-ed  Offline
Member
Joined: Jul 2002
Posts: 175
Canada
Sounds like the kind of installation that should be engineered.
I would follow the specs and drawings.

Ed

Re: H.V. manhole grounding #82091
10/16/02 04:45 PM
10/16/02 04:45 PM
B
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
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).]

Re: H.V. manhole grounding #82092
10/17/02 08:08 AM
10/17/02 08:08 AM
Y
yooper  Offline OP
Junior Member
Joined: Aug 2002
Posts: 8
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.

Re: H.V. manhole grounding #82093
10/17/02 02:56 PM
10/17/02 02:56 PM
B
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
Yoop—

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

Re: H.V. manhole grounding #82094
10/17/02 04:41 PM
10/17/02 04:41 PM
B
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
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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