Bonding, multiple service

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marshallf3

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Three buildings physically connected with two served by 208Y/120 from a common service and the other by 240/120V high leg Delta. None had ground rods but they're now in place and tested as far less than 25 ohms.

PCs everywhere and some common ground paths between the buildings through all the wiring. Plumbing is not shared.

May I bond the conduit from one to the other to help protect the PCs? My sense on a good lightning strike says yes.
 
marshallf3 said:
Three buildings physically connected with two served by 208Y/120 from a common service and the other by 240/120V high leg Delta. None had ground rods but they're now in place and tested as far less than 25 ohms.
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Marshal
I wanted to know what area yo are in. Getting < 25 ohms for a ground rod
does not happen too often. Are the rods std 10' copper clad?
 
Thanks George. All the PCs have TVSS one way or another but I prefer an all around building plan rather than relying on "after the fact" so to speak. I do plan to add a panel TVSS to both service entries.

Bob - We're in Oklahoma. I drove one rod (copper clad 5/8" x 10') into the ground right in front of the buildings directly under the service entrance and by the questionable method of measurement I found that a standard 100W bulb was only showing a 3.42V drop from the Neutral. I realixe this is an old method but fine as far as I see for our end of lightning protection.

On the 240/delta I can barely measure 22 ohms in the end but considering these old buildings are in a gravel base I'm either going to have to live with it or do better.

In my opinion, considering the long run from the service provider, they should provide a better path. I'm already committed to driving in two more rods for my own sense of well being but I think the utility companies would take more pride in their work.

"The guy wires will take care of it"

Perhaps, but I found GECs off the poles that were broken for who knows how many years.

Sorry to vent, just my thoughts.
 
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