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PROTECTION CLASSES FOR SWITCHGEAR

PROTECTION CLASSES FOR SWITCHGEAR

The protection classes are identified by a  symbol made up of abbreviated letters IP, which denotes Ingress Protection. Followed by the Letters IP, two digits denoting the degree of protection. If required, the supplementary code letter, B is added, if in the case of switchgear and distribution equipment the protection class is attained only through taking certain measures when the apparatus is installed.

The term “protection class” denotes the complete compound symbol (code letters, code digits, and the supplementary code letter if applicable).

For Example : IP 43B denotes

IP : Ingress Protection

First digit: 4  -  degrees of protection against contact and ingress of

foreign body

Second digit : 3  -  degrees of protection against ingress of water

Supplementary code letter : B  -  sealing material between floor, ceiling or wall

Table 1

Degrees of protection

Degrees of protection against contact and foreign bodies

Degrees protection against water

First digit

Description

Second digit

Description

0

1

 

2

 

3

 

4

 

5

 

6

 

no protection

Protection against large foreign bodies

 

Protection against medium sized foreign bodies

Protection against small foreign bodies

Protection against granular foreign bodies

 

Protection against dust deposits

 

Protection against ingress of dust

0

1

 

2

 

3

 

4

 

5

 

6

 

7

 

 

8

 

 

 

 

no protection

Protection against medium falling water droplets

Protection against obliquely falling water droplets

 

Protection against sprayed water (spray proof)

Protection against splashing (splash proof)

 

Protection against water jets (hose proof)

Protection against inundation

 

Protection against immersion in water

 

Protection against indefinite immersion in water

 

 

 

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