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grounding light poles #9563
05/03/02 12:03 AM
05/03/02 12:03 AM
M
menegt  Offline OP
Member
Joined: Jan 2002
Posts: 34
sacramento, ca
Does anyone know the preferred means of grounding light poles besides the grouding electrode?

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Re: grounding light poles #9564
05/03/02 07:59 AM
05/03/02 07:59 AM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,902
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

Re: grounding light poles #9565
05/03/02 08:19 AM
05/03/02 08:19 AM
M
menegt  Offline OP
Member
Joined: Jan 2002
Posts: 34
sacramento, ca
thanks bill, how about bonding to the re-bar cage?

Re: grounding light poles #9566
05/03/02 09:01 AM
05/03/02 09:01 AM
D
DB  Offline
Member
Joined: Mar 2002
Posts: 18
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


DB
Re: grounding light poles #9567
05/03/02 09:07 AM
05/03/02 09:07 AM
D
DB  Offline
Member
Joined: Mar 2002
Posts: 18
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
Re: grounding light poles #9568
05/03/02 08:50 PM
05/03/02 08:50 PM
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA


Joe Tedesco, NEC Consultant
Re: grounding light poles #9569
05/04/02 02:51 PM
05/04/02 02:51 PM
B
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
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.

Re: grounding light poles #9570
05/05/02 01:59 AM
05/05/02 01:59 AM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
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)
Re: grounding light poles #9571
05/05/02 04:42 PM
05/05/02 04:42 PM
B
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
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. ;-)

Re: grounding light poles #9572
05/07/02 08:29 PM
05/07/02 08:29 PM
M
menegt  Offline OP
Member
Joined: Jan 2002
Posts: 34
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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