Re: Ground Ring
Pierre, I have worked in the Telecom industry most of my career, and here is my two cents worth on ground rings. They are most beneficial if used in conjunction with a lightning protection sub-system to minimize step-potential differences inside a protected facility.
In facilities like a phone office or data centers you have outside plant cables (AC, copper, fiber, coax, etc.) entering at different locations along the outside walls. With a ring in place it makes it very easy to obtain access where the cables enter to facilitate installation of SPD's and other GE connections.
I do not really care what the impedance is to ground unless I am under government contract to provide a target. But in my experience a ring most of the time provides 5 ohm's or less. Personally I do not use the minimum number 2 AWG but rather a 2/0 with welds for all connections.
Pierre, I have worked in the Telecom industry most of my career, and here is my two cents worth on ground rings. They are most beneficial if used in conjunction with a lightning protection sub-system to minimize step-potential differences inside a protected facility.
In facilities like a phone office or data centers you have outside plant cables (AC, copper, fiber, coax, etc.) entering at different locations along the outside walls. With a ring in place it makes it very easy to obtain access where the cables enter to facilitate installation of SPD's and other GE connections.
I do not really care what the impedance is to ground unless I am under government contract to provide a target. But in my experience a ring most of the time provides 5 ohm's or less. Personally I do not use the minimum number 2 AWG but rather a 2/0 with welds for all connections.
