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What is Zone 1, Zone 2, Zone 3?

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Popular science knowledge about dangerous area of explosion-proof motor (Zone1, zone2, Zone3)

Source: Shenzhen Milton Technology Co., Ltd release: 2017-07-25 10:10 10110 times view

Popular science knowledge about dangerous area of explosion-proof motor (Zone1, zone2, Zone3)

The explosion-proof certification of explosion-proof motor is their pass. Different explosion-proof grades make the motor play its role in different dangerous areas.

The explosion-proof grade is composed of three parts: different explosion-proof types in different areas, different grades of explosive mixture and different temperatures

1) In the explosive gas area (zone 0, zone 1, zone 2), the use safety level of different electrical equipment is divided. For example, the type selection of rotating motor is divided into flameproof type (code D), positive pressure type (P), increased safety type (E) and non spark type (n)


2) The classification of explosive mixture grade of gas or vapor can be divided into IIA, IIb and IIC. The classification of these grades is mainly based on the maximum test safety gap (MESG) or minimum ignition current (MICR).


3) Division of temperature groups for igniting a medium. T ≤ 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t <


Today, we mainly understand different areas, different types of explosion-proof and the application of different types of explosion-proof in different areas.

The explosion-proof certification of explosion-proof motor is their pass. Different explosion-proof grades make the motor play its role in different dangerous areas.

The explosion-proof grade is composed of three parts: different explosion-proof types in different areas, different grades of explosive mixture and different temperatures

1) In the explosive gas area (zone 0, zone 1, zone 2), the use safety level of different electrical equipment is divided. For example, the type selection of rotating motor is divided into flameproof type (code D), positive pressure type (P), increased safety type (E) and non spark type (n)


2) The classification of explosive mixture grade of gas or vapor can be divided into IIA, IIb and IIC. The classification of these grades is mainly based on the maximum test safety gap (MESG) or minimum ignition current (MICR).


3) Division of temperature groups for igniting a medium. T ≤ 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t < 300 ℃, t <


Today, we mainly understand different areas, different types of explosion-proof and the application of different types of explosion-proof in different areas.


Application of explosion-proof motor in dangerous area

Grade of hazardous area

Explosive substances

Area definition

Chinese standards

North American Standard

Gas (class I)

Zone 0 where explosive gas mixture exists continuously or for a long time, the hazardous environment is more than 1000 hours / year. Only type 1 devices can be tried

Zone 0

(Zone 0)

Div.1

When Zone1 is in normal operation, explosive gas mixture may appear. In some places, the existence time of dangerous environment is 10-1000 hours / year. Only class 1 and class 2 equipment can be used

Zone 1

(Zone 1)


Zone2 is a place where explosive gas mixture is not likely to appear under normal conditions, only occasionally or for a short time under abnormal conditions, and the existence time of dangerous environment is less than 10 hours / year. Class 1, 2, 3 equipment available

Zone 2

(Zone 2)

Div.2

Dust or fiber (class II / III)

Under normal conditions, explosive dust or mixture of combustible fiber and air may appear continuously, frequently for a short time or exist for a long time

District 10

(Zone 10)

Div.1

Under normal conditions, explosive dust or mixture of combustible fiber and air can not appear, only under abnormal conditions, occasionally or for a short time

District 11

(Zone 11)

Div.2



Explosion proof method

code

Explosion proof type

Explosion proof measures

Applicable area

D

Flameproof type

Isolate the existing ignition source

Zone1,Zone2

E

Increased safety type

Try to prevent ignition sources

Zone1,Zone0

ia/ib

Intrinsically safe type

Limit the energy of the ignition source

Zone0,Zone1,Zone2

ma/mb

exm

Try to prevent ignition sources

Zone1,Zone2

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