Ground Ring depth and Touch/Step potential

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John Scapillato

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I have seen some utility standards which use ground rings around pad mount distribution transformers. I've read that this configuration will reduce step and touch potentials but I am failing to see how without a full grid being installed under the pad. I understand ground rings can be used for stations or equipment houses to create equipotential planes so that as a fault occurs the GPR seen by all equipment will be the same. But what is the purpose for a single transformer? Other than tying the multiple grounds together to reduce the overall electrode resistance. Also, I am wondering what depth should the ring be installed? Does greater depth of the ring conductor reduce protection against the step or touch potential? Or are we just trying to bury the conductor below the frost line. That's a mouthful, so thanks in advance to any who can help make this clear for me.
 
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