How to distinguish the explosion-proof grade of explosion-proof electric hoist?
Classification
It is easy and high efficient to distinguish the explosion-proof grade through motor explosion-proof grade and electrical panel IP grade.
4.1.1 The explosion-proof bridge crane used in explosive environment to which this standard applies, its gas storage equipment shall comply with the regulations in Chapter 4 of GB 3836.1-2010
Class II and III, the corresponding explosion-proof bridge crane is classified as:
Class II: Explosion proof bridge crane for explosive gas environment other than coal mine gas:
Class III: Explosion proof bridge crane for explosive dust environment other than coal mine.
4.1.2 Class II explosion-proof bridge cranes can be further divided into Class IIA, IIB and IIC explosion-proof cranes according to the type of explosive gas environment they are intended to useExplosive bridge crane. The representative gas of Class IIA explosive environment is two kang; The representative gas of Class IIB explosive environment is ethylene; Category II C explosion
The representative gas of explosive environment is hydrogen.
Note 1: On the basis of seven classifications, the maximum test safety clearance (MESG) of flameproof enclosure and gas equipment for flameproof crane and intrinsically safe crane
Heavy machine is the minimum ignition current ratio (MICR) of electrical equipment.
Note 2: Class IIB explosion-proof bridge crane can be used for Class IIA explosion-proof bridge crane. For Class IIC explosion-proof bridge crane, port J is used for
Service conditions for IIA and I1 B explosion-proof bridge cranes.
Class III explosion-proof bridge cranes can be further divided into Class IlIA, IIIB and IIIC explosion-proof cranes according to the characteristics of the explosive dust environment to be used
Explosive bridge crane. IIlA explosive dust is combustible flying flocs; Class IIIB explosive dust is non-conductive dust; Class IIIC explosive powder
Dust is conductive dust.
Note: Type IIlB explosion-proof bridge crane opening J is applicable to the service conditions of Type IIl A explosion-proof bridge crane: Type IIIC/lJ explosion-proof bridge crane can be applicable to IIIA and
Service conditions of I1I Class B explosion-proof bridge crane.
