The explosion proof performance of all electrical machines and electric appliances of QB model explosion proof overhead crane with hook conforms to the precriptions of GB 3836.2-2000 explosion proof electrical Apparatus For Explosive Atmosphere Part Two: flameproof type, the performance of complete machine conforms to the prescriptions of JB/T5897-2006 Explosion proof bridge crane. The crane is qualified inspected by inspection unit of blast-proof product which is appointed by the state. The crane has got certification of conformity of an instrument for explosive atmosphere. The signs of explosion proof are Exd II BT4 and Exd II CT4 respectively.

The product is applicable to the place in the factory where the capability of transmitting explosive is no higher than grade IIB or IIC, and where has mixture of detonating gas which is composed of flammable gas or steam whose ignition temperature team belongs to T1~T4 team, and air. The applicable danger area is Area 1 or Area 2( See GB 3836.1-2000) The working class is middle.