ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

ECN Shout Chat
Top Posters(30 Days)
Admin 19
Recent Posts
Anyone hiring inspectors?
by HotLine1. 03/27/17 08:03 AM
Old decora style outlets
by Admin. 03/25/17 11:40 AM
ESA Arc flash course
by TheShockDoctors. 03/24/17 10:15 AM
fuse rejectors
by HotLine1. 03/24/17 07:53 AM
Another Forum Update
by Admin. 03/22/17 03:04 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,640 Are you busy
166,517 Re: Forum
160,724 Need opinion
Who's Online Now
1 registered members (Tjia1981), 70 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
Page 1 of 2 1 2
#48574 - 02/15/05 09:23 PM Anybody do lightning systems?  
hbiss  Offline
Member
Joined: Dec 2003
Posts: 886
Hawthorne, NY USA
Anybody with lightning protection experience? I have a job coming up where I will have to run some #4 copper ground conductors on a pitched asphalt shingled roof from an antenna site installaton. I am thinking that this is done regularly with lightning protection systems and the same cable fasteners should work well for this application.

I see that there are basically only two types of fasteners- a copper loop or strap with a nail or screw through it and a square copper pad that gets stuck to the roof with pitch or adhesive. Problem is all the lightning protection systems I have seen have been on buildings with flat roofs and masonry construction so anything I saw won't really apply here.

I'm leaning towards the nail and strap with maybe a dab of sealant but I'm not liking that. Anybody done this before?

-Hal


Work Gear for Electricians and the Trades

#48575 - 02/16/05 06:34 AM Re: Anybody do lightning systems?  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,211
SI,New Zealand
Hi Hal,
What sort of Antenna system is the grounding conductor protecting?.
Personally I would agree with your statement on the fastening of the Grounding Conductor, it does need to be as strong as possible.
Coming from a PoCo background, I have seen Grounding wires wrapped around 11kV conductors, a long way above the position where the should have been connected.
During a lightning strike, the Energy levels are HUGE!.


Let's face it, these days if you're not young, you're old - Red Green grin

#48576 - 02/16/05 08:56 AM Re: Anybody do lightning systems?  
Big Ed  Offline
Member
Joined: Apr 2004
Posts: 55
Roxboro, NC, USA
We have just replaced all of the aerial lightning protection on our two cooling towers. We used the copper loop type support. Ours was a different roof than you are dealing with, but they are very secure.

Just out of curiosity, how will you be connecting to ground and to the antenna? The reason that we replaced our system was due to mechanical compression fittings. They had to be replaced with exothermic welds. It is really not that difficult to do, but there is a bit of up-front costs and you have to be careful not to set your roof on fire.

I have a buddy who does roofing. I will see him tonight and will try to remember to ask him about the fasteners.

Have a great day
Ed


#48577 - 02/16/05 10:25 AM Re: Anybody do lightning systems?  
hbiss  Offline
Member
Joined: Dec 2003
Posts: 886
Hawthorne, NY USA
Thanks guys. This is a 1.2m sat dish mounted on a steel channel framework as well as some VHF TV/FM antennas located a short distance away. We normally use compression connectors (lugs) and have not had any problems. Just never had to do this on this type of roof before. I'm a bit leery of putting nails or screws through the shingles.

-Hal


#48578 - 02/16/05 09:21 PM Re: Anybody do lightning systems?  
dereckbc  Offline
Member
Joined: Oct 2003
Posts: 156
Tulsa, OK
Hal, I do a lot of the designs or should I say I used too. There are several companies that make the products, I used Advance Lightning Protection Technologies. They have non-metalic clamps to use and you fasten them to the roof using either black-top cement or epoxy.


#48579 - 02/16/05 11:24 PM Re: Anybody do lightning systems?  
hbiss  Offline
Member
Joined: Dec 2003
Posts: 886
Hawthorne, NY USA
Thanks Dereck. Non-metalic is interesting, never found them anywhere, should be similar to the copper ones I have seen. Can't find Advance Lightning Protection Technologies. Any ideas?

-Hal


#48580 - 02/16/05 11:36 PM Re: Anybody do lightning systems?  
dereckbc  Offline
Member
Joined: Oct 2003
Posts: 156
Tulsa, OK
Let me do some checking with some of my ex employees tommorow and see if they are still in biz.


#48581 - 02/17/05 11:23 AM Re: Anybody do lightning systems?  
dereckbc  Offline
Member
Joined: Oct 2003
Posts: 156
Tulsa, OK
Advanced Lightning Technologies
122 Leesley Lane
Argyle, TX 76226
940-455-7300 www.advancedlightning.com

Moderators this is not an advertisement, just info I am passing along as requested.

Hal if the info gets deleted PM me on that other web site I hang out at, and I will resend via PM.


#48582 - 02/17/05 02:25 PM Re: Anybody do lightning systems?  
hbiss  Offline
Member
Joined: Dec 2003
Posts: 886
Hawthorne, NY USA
Thanks Dereck, got it.

-Hal


#48583 - 02/17/05 10:33 PM Re: Anybody do lightning systems?  
Clydesdale  Offline
Member
Joined: Nov 2004
Posts: 138
is #4 copper typical for lightning protection?

[This message has been edited by Clydesdale (edited 02-17-2005).]


Page 1 of 2 1 2

Member Spotlight
JoeKP
JoeKP
Berkley, MA
Posts: 144
Joined: March 2008
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.025s Queries: 15 (0.005s) Memory: 0.8151 MB (Peak: 0.9890 MB) Zlib enabled. Server Time: 2017-03-28 12:05:04 UTC