ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Increasing demand factors in residential
by gfretwell - 03/28/24 12:43 AM
Portable generator question
by Steve Miller - 03/19/24 08:50 PM
Do we need grounding?
by NORCAL - 03/19/24 05:11 PM
240V only in a home and NEC?
by dsk - 03/19/24 06:33 AM
Cordless Tools: The Obvious Question
by renosteinke - 03/14/24 08:05 PM
New in the Gallery:
This is a new one
This is a new one
by timmp, September 24
Few pics I found
Few pics I found
by timmp, August 15
Who's Online Now
0 members (), 255 guests, and 16 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#100287 11/08/06 05:20 PM
Joined: Oct 2002
Posts: 482
Z
Zapped Offline OP
Member
Hey Everybody,

I'm arguing with a low-ball lighting installer about the need for poles to be grounded as well as the luminaires on 12' parking lot lights. The installer seems to think that the mechanical link between the pole and the luminaire is sufficient, so only the luminaire needs to be grounded. I call BS and reference 410.15 (specifically, 410.15(B)(5)) and feel that the code specifies that any metalic pole, 8' or higher, needs to be bonded to ground using the grounding bolt welded to the inside of the hand hole, and using the manufacturer-supplied (and UL listed) gounding hardware. The luminaire, of course, must be grounded ALSO.

My logic is that if, for some reason (corrosion, a hit from a moving truck, etc.), the luminaire becomes detached from the pole, or the mechanical link becomes comprimised in any way, the pole then becomes a possible conductor when/if a fault occurs. Add one barefooted kid leaning on the pole, and we have a tragedy that could have been easily avoided.

BTW, this guy came in to one of the communities that I service and underbid my company on the pole replacements by using "immigrants of questionable legality" to perform the work for him. There was never, to my knowlege, a certified or licensed electrician on site during the entire process. And yes, I may be a little biased in my motives on this issue.

Does anybody think that I'm out of line on this, or am I right? Are there any inspectors here that have run across this issue and made the call either way?

Thanks in advance for your input.

Stay up to Code with the Latest NEC:


>> 2023 NEC & Related Reference & Exam Prep
2023 NEC & Related Reference & Study Guides

Pass Your Exam the FIRST TIME with the Latest NEC & Exam Prep

>> 2020 NEC & Related Reference & Study Guides
 

#100288 11/08/06 05:59 PM
Joined: May 2002
Posts: 1,716
R
Member
Zapped, I agree with you, 410.15(B)(5)is mighty clear in requiring the pole to be bonded to an EGC.

Roger

#100289 11/08/06 06:39 PM
Joined: Jan 2006
Posts: 558
R
Member
Well, the way I see it, even if it was not required to be bonded, The bonding conductor is present and running right past the bonding stud up to the fixture, so why not just take the extra 30 seconds and bond the pole anyway. For the time and material it might take, its peanuts and
" cheap insurance" compared to what the price may be if someone were to get hurt or killed because the pole somehow became hot.

A.D

#100290 11/09/06 08:20 AM
Joined: Apr 2002
Posts: 7,381
Likes: 7
Member
Zapped:
YES, poles MUST be bonded. This discussion was recently had regarding a "fail" sticker I posted on a site lighting project.

John


John
#100291 11/09/06 11:08 AM
Joined: Oct 2002
Posts: 482
Z
Zapped Offline OP
Member
Thank you gentlemen, it's nice to have some back-up when you know you're right.

It's difficult to beleive what people will argue with you about sometimes.

BTW, sorry for double posting Roger. Thanks for handling that!

#100292 11/09/06 03:10 PM
Joined: Jul 2004
Posts: 9,923
Likes: 32
G
Member
As a design issue I would like to see the bonding conductor being a bit longer than the circuit conductors so it would break last in a collision.


Greg Fretwell
#100293 11/09/06 03:54 PM
Joined: Apr 2002
Posts: 7,381
Likes: 7
Member
Gfretwell:
Sounds plausable.....
Most of the impacts I have dealt with have resulted in some spectacular fireworks; either upon impact, or the 'maintenance guy' trying to reset the 3-pole cb.

John

[This message has been edited by HotLine1 (edited 11-09-2006).]


John
#100294 11/09/06 04:30 PM
Joined: May 2002
Posts: 1,716
R
Member
Zapped, no need for an appology.


Roger

#100295 11/10/06 10:57 AM
Joined: Oct 2002
Posts: 482
Z
Zapped Offline OP
Member
gfretwell: I wholeheartedly agree with the extra ground wire length.

I've been the guy to go out a secure the sites after poles have gone down, and more than once I've found the wire over extended to the point of failure, and have found more than one has become a 4" X 4"X 20' steel conductor. I've always been glad that I found it before a someone else.

Around here, it's becoming a real problem. So called "lighting" speciallty contractors are entering into the market and are practicing predatorial bidding to get into a job, then using unqualified labor in order to turn a profit on an impossibly low bid. The result? The customers get what they pay for. And IMHO, it's scary, and it will not end well.


Link Copied to Clipboard
Powered by UBB.threads™ PHP Forum Software 7.7.5