Insulating Caps, Non-Conductive Cuff vs Conductive Cuff

While getting specs on 15kV and 25/28kV Insulated Caps, I noticed the option between conductive and non-conductive cuff. Anyone know the application for the conductive cuff?

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After doing some research on this, I wasn’t able to come up with a definitive answer. The only reason I can think is it helps with bleeding stray voltage. T&B literature notes the insulated cuff as having “extra protection.”