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#82089 10/16/02 03:16 PM
Joined: Aug 2002
Posts: 8
Y
yooper Offline OP
Junior Member
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 04:57 PM
Joined: Jul 2002
Posts: 175
E
Member
Sounds like the kind of installation that should be engineered.
I would follow the specs and drawings.

Ed

#82091 10/16/02 05:45 PM
Joined: Apr 2002
Posts: 2,527
B
Moderator
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).]

#82092 10/17/02 09:08 AM
Joined: Aug 2002
Posts: 8
Y
yooper Offline OP
Junior Member
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.

#82093 10/17/02 03:56 PM
Joined: Apr 2002
Posts: 2,527
B
Moderator
Yoop—

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

#82094 10/17/02 05:41 PM
Joined: Apr 2002
Posts: 2,527
B
Moderator
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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