OSHA requires the frames and tracks of electrically operated cranes and hoists to be grounded such that "[t]he path to ground from circuits, equipment, and
The above safety code incorporates NEC Article 610. This clearly states that crane trolley and bridge frames shall not be considered electrically grounded
610.11 Wiring Method. Conductors shall be enclosed in race‐ ways or be Type AC cable with insulated grounding conductor,. Type MC cable, or Type MI cable
610.11 Wiring Method. Conductors shall be enclosed in raceways or be Type AC cable with insulated equipment grounding conductor, Type MC cable, or Type MI cable