This document stipulates the terms and definitions, types, technical requirements, etc. of overhead cranes passing rails. This document is applicable to cranes that have rail-passing requirements in general working environments, and their retrieval devices are mostly hooks. This document does not apply to cranes under the following conditions:
——Explosive gas, combustible dust and corrosive gas environments;
——Nuclear radiation environment, toxic gas environment;
——Lifting molten metal, flammable and explosive items.