Industry Forums > Wireless Service Providers > grounding gurus? comments please (pics attached)

grounding gurus? comments please (pics attached)

the two green wires from the grounding bar go to the antennas.
the grounding bar sits on an isolator (red one)

I have never seen a rooftop with cell antennas that bothered to install air terminals anywhere on the roof even if their antennas or mounting pole is the highest thing up there.

reply to thewisperer
Do you have the conduit that the ground wire is running through bonded to the ground wire that is going into and out of ? If not you must do that, as per NEC. Now, I see that you are from up north, and I would bet this is also part of your National Electrical Code, whichever it may be. I am unfamiliar with Canada code but this is pretty much a universal standard, and even if it is NOT require it should be done as part of best practices.

Air terminals on the building are not required, but it is always suggested. At a minimum, the mast must be bonded to a grounding system, and this must be bonded to the building ground system. It is advised that you install an air terminal above the omni.
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the conduit is not grounded to anything: the ground wire is insulated: what diff could that make?

I am Canadian! (good beer!) Everything pictured here follows and exceeds CSA standards.

And again, when I drive around Ottawa and Montreal, I have yet to see air terminals put up by any cell carrier in Canada on building rooftops.

They simply ground their antennas the way pictured here.

I remember Lutful saying about a year ago that the ground from your antennas should not be redirected inside the building to the "main" ground but that's how cell companies do it.

it is my understanding that we bond the ground wire before and after entering metallic conduit to prevent the conduit from causing an rf choke condition during an event.

reply to thewisperer

reply to thewisperer
Im no guru, but I would have brushed (with a wire brush) the copper plate where you attached the lugs to remove the oxidation to help create a better bond between them both.

hopeully it was brushed AND also coated with copper enriched connector grease.

reply to AMD Phreak
I guess I will have to point out everyone's observations to the licensed electricians who put this together.

They will probably tell me that they were only following the directions (plans) of the engineers who wrote this out for the cell company.

It so happens the the building is owned by an engineer whose firm works often with various Cnd cell providers.

The owners happen to be particularly picky.

reply to public

reply to thewisperer

reply to lutful

btw: are you a licensed electrician in the province of Quebec.

have you ever designed anything that was then installed by a large cell phone company? (hope not or we are in real trouble)

I will post pics on the weekend of another grounded cell rooftop installation (which this is) and its no different than the one pictured above.

shit: I just drove by the building: or where it used to be....
in front of the tree!

Guess Lut was right: they did it all wrong

See whats left

»www.google.ca/imgres?imgurl=http···oQ9QEwAg

reply to thewisperer

reply to thewisperer
I cannot see how you have the grounds placed on your grounding bar, none the less keep in mind the concept of a ground window when placing your grounds on that bar in relation to where the building ground is connected.

Wayne
--
If you cannot fix it with a buttset and some beanies you're not a technician.

reply to AMD Phreak

reply to public