BQC Series (ⅡC type) Explosion-proof Motor Control Box

Ambient temperature: -25℃- 45℃

There are oil mist and salt spray in the humid air at sea

There are shocks and vibrations generated during normal operation of the ship.

Tilt, sway: ±22.5 degrees

Explosive gas environment hazardous places 1 zone, 2 zone

Combustible gas vapor class; ⅡA ⅡB

Temperature group: T1-T4

Control box explosion-proof level: ExdⅡBT4

Protection level: IP56

1. Division of explosive atmospheric hazard areas

Different countries and regions, according to their own standards divide the explosive hazard area. China according to the frequency and duration of explosive gas mixtures, the explosive gas environment is divided into O, 1 and 2 zones. (with IEC Electrotechnical Commission *)

Zone 0: continuous occurrence or * occurrence of explosive gas mixtures in the environment.

Zone 1: An environment in which explosive gas mixtures may occur during normal operation.

Zone 2: An environment where explosive gas mixtures are unlikely to occur during normal operation or where explosive gas mixtures, if present, are only present for a short period of time.

Zone 0 generally exists only in sealed containers, storage tanks and other internal gas space, in the actual design process Zone 1 is rarely present, and most cases belong to Zone 2.

2. Explosion-proof electrical equipment is divided into two categories.

Class I electrical equipment for underground use in coal mines.

Class II electrical equipment used on occasions other than mine.

3. Class II electrical equipment, according to its applicability to explosive gas mixtures with large test safety gaps or small ignition current ratio, is divided into ⅡA, ⅡB, ⅡC three categories; and according to its surface temperature is divided into T1-T6 six groups.
4. Explosive gas mixtures are grouped according to the ignition temperature.