The electrical and mechanical components inside the equipment must have their own "insurance". 

· Explosion-proof motor: Explosion-proof type is required, and built-in overheating protection is required to prevent the temperature from exceeding the standard during stall. 

* Explosion-proof brakes: The brake pads must be made of copper-based non-spark alloy to avoid sparks from friction. 

· Non-spark components: hooks, chains, etc. need to be treated with anti-static electricity or wrapped in copper alloy. Direct collision with exposed steel is strictly prohibited. 

· Speed limit: The lifting and operating speed should usually not be greater than 25 m/min to prevent inertial sparks from emergency stop and emergency start.