John Deere and Detroit had no such rule, or at least not enforced! I'll have to ask some of my old Cat buddies.
Martin
Every company and even location will be different. But the CAT dealer I work for and the location I work at, safety is an absolute priority (strictly enforced), and they don't give much on the rules and policies. Too many people get hurt or get killed.
We have a safety meeting every morning. We have to fill out a Job Hazards Analysis before we can start even the simplest job. Constant inspections including tool boxes and even extension cords.