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Re: Grounding / Bonding question said by Splitpair:said by pende_tim:In order to eliminate ground loops for lightning protection, all the grounds back into the house should be arranged in a "star" configuration. Tim That is not how we do cell sites and many times they have engineered ground systems. Wayne They don't use single point ground systems? Wow. They must be using some pretty stiff isolators between the various systems.
The ground rods can be set in any configuration as long as they are interconnected but the ground connection to the electronics and mains power neutral & ground should be connected to a single point off the ground rod system.
In a former life, I was chief engineer in a HV test facility so this advice comes not just from "the theory" but from personal experience (and some blown instrumentation).
Tim
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The difference between genius and stupidity is that genius has its limits. |
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 SplitpairPremium
join:2000-07-29
Cow Towne
kudos:3 | said by pende_tim:They don't use single point ground systems? Wow. They must be using some pretty stiff isolators between the various systems. Tim Not really the system works by floating all components to the same level be it zero or tens of thousands of volts. As long as everything is equal there is not current flow between components therefore no damage. Simular to a bird sitting on a primary yea he's charged to 7.6 Kv but un-injured as there is no flow.
Wayne
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If you cannot fix it with a buttset and some beanies you ain't a technician.
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1 edit | Hi Wayne,
It looks like the are really implementing the single ground point.
The tower is grounded to a ring on the right and that should take the hit from a lightning strike. There is only a single point connection between the right side ring and the left side ring just under the ice breakers so there will be no appreciable current circulating through the loop on the left causing any voltage drop in that loop. That will keep the MGB and the AC/Telco ground points at roughly the same potential.
Yes the site potential can rise during a strike, but as you point out, it does not matter as long as everything rises together. By having only one connection to the fault current path everything rises together.
It is the voltage difference that makes current flow and bad things happen.
Tim |
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