Is the explosion-proof grade and protection grade of the explosion-proof motor the same thing

The parameters of explosion-proof motor generally include: explosion-proof grade, protection grade, insulation grade, etc. Explosion-proof grade refers to the type selection of explosion-proof structure of various electrical equipment in different dangerous areas of explosive gas environment, such as Exd IIBT4, while protection grade refers to the grade of waterproof and dustproof of electrical equipment such as motor.For example, IP55.Sometimes it's easy to confuse the level of explosion protection with the level of protection, so let's talk about the meaning and difference between the level of explosion protection and the level of protection:

1. Explosion-proof grade of the motor

The explosion-proof grade of the motor consists of three parts:

(1) the division of the safety level of different electrical equipment in the explosive gas area (zone 0, zone 1 and zone 2).For example, the selection of explosion-proof motor is divided into flameproof type (code d), positive pressure type (p), increased safety type (e), and type n

(2) gas or steam explosive mixture grade division, is divided into A and B Ⅱ Ⅱ, Ⅱ C three, these grades division is mainly in accordance with the maximum experimental safe gap (MESG) or (MICR) to differentiate between the minimum ignition current.

(3) the division of the temperature grouping of the ignition medium.It is mainly divided into t1-450 ° c < T, t2-300 < T≤ 450 ° c, t3-200 < T≤300 ° c, t4-135 < T≤200 ° c, t5-100 < T≤135, t6-85 < T≤100 ° c.

2. Motor protection level:

The protection class of the explosion-proof motor under normal conditions is IP55.Also can be made according to the special needs of users IP65 and other protection grade motor.The marking of the protection level consists of the letter "IP" and the two Numbers appended to it.Examples are as follows:

(1) the first characteristic number represents the protection level of the shell against human and internal parts of the shell.Meaning of Numbers:

0. No test for non-protective motor without special protection.

1. The motor with a shield of more than 50MM solid can prevent large area of human body from accidentally touching or approaching the live or rotating parts in the shell.It can prevent solid foreign body with diameter more than 50MM from entering the shell

2. The motor with a diameter greater than 12MM can prevent solid foreign bodies with a diameter greater than 12MM from entering the shell

3. Protection of motors with solids greater than 2.5mm can prevent tools or wires with diameters greater than 2.5mm from touching or approaching live or rotating parts in the shell

4. The motor with a solid diameter of more than 1MM can prevent wires or strips with a diameter or thickness of more than 1MM from touching or approaching live or rotating parts in the shell

5. The dustproof motor shall have no harmful effect when it is subjected to splashing water in any direction

(2) the second characterization number represents the level of protection against harmful effects caused by water entering the shell.Meanings of each number:

0. No special protection for motor

1. There should be no harmful effect of vertical dripping of drip proof motor

When the motor tilts from its normal position in any direction to any Angle within 15 degrees, the vertical dripping shall have no harmful effect

3. There should be no harmful effect on water spraying within the range of 60 degree Angle between the water-proof motor and the vertical line

4. The anti-splash motor shall have no harmful effect when it is subjected to splash in any direction

5. The water-proof motor shall have no harmful effect on water spraying in any direction

6. When the wave-proof motor is under the impact of violent waves or strong water spraying, the water inflow of the motor should not reach the harmful level.

7. Water-proof motor when the motor is immersed in the water at a specified pressure for a specified period of time, the inflow of the motor shall not reach a harmful degree

8. Submersible motor the motor can be submerged for a long time under the conditions specified by the manufacturer.Motors are generally watertight, so water may be allowed to enter certain types of motors, but not to a harmful degree.

Conclusion: the explosion-proof grade is set for the use environment of explosion-proof motors. Explosion-proof motors of different explosion-proof grades are used in different environments.The protection level is the protection measure of the explosion-proof motor in the normal operation process.