Now that you mentioned it, and my memory gets joggled, yes for high voltage. In fact ... ahhh the big printing presses that newspapers use. The 3 armed spider that holds the 4ft diameter paper rolls that wt. 2500 lb.s If you take the cover off, you will see a G10 disk that is about 3 1/2' in diameter. There are about 24 slip ring traces that are 3/8" wide? That disk is light green G10. And there's 120 or 220 volts going to the slip rings along w/ other servo signals. The problem with growing old, you can't remember s#*t.