You are correct on the UL sticker. Never the less, I like to ground all electrical devices. I always put a seperate ground on washing machine or dryer. Many years ago I noticed that the washing machine gave off a tingle when I put the clothes on it, I dismissed it as static electric. So I put a ground to a water pipe, what I got was one **** of a spark. What had happened in the fuse box was that the clamp on it wore through the main wire insulation and made the box hot, thus power touches the ground but since there was no CB or fuse between that and the meter pan, power ran through the ground to all appliances. Needless to say, I replaced all from the pothead to the new circuit breaker box. Later I got the power company to change the wire to the pole from AL to 2 AWG copper , replace the rotted pole and replaced the transformer.
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