I have recently relocated from NY to NC. Am working in a shop where they don't believe in wearing leather protectors over their L.V. rubber gloves. I've tried ASTM F-696-97, OSHA 1910.335 (a) and NFPA 70-E and none of them specifically state a requirement for wearing leather protection over rubber. The codes all state: shall, may or should. I'm from an electrical family and not wearing leather "keepers" is unheard of. I've also tried explaining that there are other hazards besides puncturing the rubber glove. Abrasion, chemical contamination, not to mention heat during an Arc Flash. I would appreciate some input on this as I can't seem to convince to brother electricians of the unnecessary risks they are subjecting themselves to. Thanks all and have a great day.