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#9563 - 05/02/02 09:03 PM grounding light poles
menegt Offline
Member
Registered: 01/09/02
Posts: 35
Loc: sacramento, ca
Does anyone know the preferred means of grounding light poles besides the grouding electrode?
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#9564 - 05/03/02 04:59 AM Re: grounding light poles
Bill Addiss Offline
Member
Registered: 10/07/00
Posts: 4196
Loc: NY, USA
There seems to be a big misconception that ground rods should be used to ground light poles. The fact is that connections to earth alone like that have too much resistance (impedance) to be of any use in a tripping a breaker if the pole was to become energized. The preferable method of grounding is by connection to a grounding conductor that is run with the supply wires.

Bill
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#9565 - 05/03/02 05:19 AM Re: grounding light poles
menegt Offline
Member
Registered: 01/09/02
Posts: 35
Loc: sacramento, ca
thanks bill, how about bonding to the re-bar cage?
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#9566 - 05/03/02 06:01 AM Re: grounding light poles
DB Offline
Member
Registered: 03/05/02
Posts: 18
Loc: St. Louis
Mike Holt has been discussing this issue in this newsletter. You should be able to find the topic on his website.
http://mikeholt.com
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DB
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#9567 - 05/03/02 06:07 AM Re: grounding light poles
DB Offline
Member
Registered: 03/05/02
Posts: 18
Loc: St. Louis
This is the second attempt to post this reply. Hope is it not a duplicate

Try going to Mike Holt's website. He has been discussing it.
http://mikeholt.com
_________________________
DB
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#9568 - 05/03/02 05:50 PM Re: grounding light poles
Joe Tedesco Offline
Member
Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
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Joe Tedesco, NEC Consultant
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#9569 - 05/04/02 11:51 AM Re: grounding light poles
Bjarney Offline
Moderator
Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
My experience has always been in low-isokeraunic areas, {5-10…not 100 like in central Florida} but the flat-coil-of-#6-solid-in-the-bottom-of-the-hole ground electrode is useless for clearing 60Hz faults. It is needed for the “lighting rod” characteristics of a lot full of aluminum light standards.
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#9570 - 05/04/02 10:59 PM Re: grounding light poles
resqcapt19 Offline
Member
Registered: 11/10/00
Posts: 2209
Loc: IL
Bjarney,
Can you cite any document or source that says the coil of #6 at the bottom of the hole makes a better grounding electrode than the concrete base and its re-bar?
Don(resqcapt19)
_________________________
Don(resqcapt19)
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#9571 - 05/05/02 01:42 PM Re: grounding light poles
Bjarney Offline
Moderator
Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
No, I'm sorry I can't. I was taking for granted that a couple of acorn clamps on the #6 from the coil extension passing the rebar cage being a de facto practice—but shoulda’ figured it as a “regional variation." It would be a waste not to take every advantage of a ready-made attribute that comes with cages and concrete. In my experience, that detail seems to show up in a lot of municipal-specification boilerplate, but then again I've not worked in Detroit, Michigan or Muleshoe, Texas.

The ‘coil’ has probably been adapted from the long-standing utility practice for wood-pole butt grounding. The hippest in-the-know electrical experts call it a microUfer matrix. ;-)
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#9572 - 05/07/02 05:29 PM Re: grounding light poles
menegt Offline
Member
Registered: 01/09/02
Posts: 35
Loc: sacramento, ca
ok guys, so should i rely on my grounding electrode in the conduit or should you also run a bonding jumper from the cage through the form of the base to the hand hole.... simplist explanations greatly appreciated...
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