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ScameOnLine
3th April 2009


Degree of protection:
but why IP?

Scame
The meaning of IP Degree of protection is commonly known, but the meanings of the various numbers and letters that come with it are more obscure.

And the real meaning of “IP” seems to be a complete mystery.

Just try asking someone.

Well, IP means International Protection.

Now that we know this, we can move on to the numbers and letters.

The IP Degree of protection is composed of two digits and two additional letters.

The first number varies from 0 to 6, and the second from 0 to 8.
The first letter can be A, B, C or D, while the second letter can be H, M, S or W.

Generally the meanings of only a few of these are known.
Thus we hope you will find the summary table provided below to be helpful.

 

 

The IP code is structured as follows:

   
IP
2
3
D
H
Characteristic letters
 
 
First characteristic numeral (from 0 to 6, or the letter X)
Protection against contact with hazardous parts and
against the ingress of solid foreign objects
 
 
Second characteristic numeral (from 0 to 8, or the letter X)
Protection against harmful ingress of water
 
 
Additional letter (optional) (letters A, B, C, D)
Protection against contact with hazardous parts
 
 
Additional letter (optional) (letters H, M, S, W)
Additional characteristics of the material
 
 

 

 

 

The meanings of the various digits are indicated below :

 

 

First characteristic numeral
Protection against ingress of solid foreign objects and against access to hazardous parts

IP Solid foreign
objects
Access to
hazardous parts
Meaning
0     No protection
1 Protected against the ingress of solid objects larger than 50 mm and against access to hazardous parts with the back of the hand
2 Protected against the ingress of solid objects larger than 12mm and against access to hazardous parts with a finger
3 Protected against the ingress of solid objects larger than 2.5mm and against access to hazardous parts with a tool
4 Protected against the ingress of solid objects larger than 1mm and against access to hazardous parts with a wire
5 Protected against dust and against access to hazardous parts with a wire
6 Complete protection against dust and against access to hazardous parts with a wire

 

 

 

Second characteristic numeral
Protection against the ingress of liquids .

IP Tests Meaning
0 No protection
1 Protected against vertically falling drops of water
2 Protected against falling drops of water when the enclosure is tilted at an angle up to 15° from the vertical
3 Protected against rain
4 Protected against water splashes
5 Protected against water jets
6 Protected against powerful water jets
7 Protected against the effects of temporary immersion
8 Protected against the effects of continuous immersion

 

 

Additional letter
Protection against contact with hazardous parts by persons

Letter Meaning
A

Protected against access with the back of the hand .
The accessibility gauge with a diameter of 50mm must maintain a suitable distance from the hazardous parts .

B

Protected against access with a finger .
The articulated test finger with a diameter of 12mm and length of 80mm must maintain a suitable distance from the hazardous parts.

C

Protected against access with a tool .
The accessibility gauge with a diameter of 2.5 mm and length of 100mm must maintain a suitable distance from the hazardous parts.

D

Protected against access with a wire.
The accessibility gauge with a diameter of 1.0 mm and length of 100mm must maintain a suitable distance from the hazardous parts.

 

 

 


Additional letter
Protection of the material .

Letter Description
H High voltage device
M Tested against the harmful effects due to the ingress of water when the moving parts of the device (e.g. the rotor of a rotating machine) are in motion.
S Tested against the harmful effects due to the ingress of water when the moving parts of the device (e.g. the rotor of a rotating machine) are not in motion.
W Suited for use in specific weather conditions and provided with additional protective measures or processes.

 

 

 

Mechanical protection
A third indicator is also available regarding the protection against external mechanical impacts.

Cifra Significato
IK00 Not protected
IK01 Protected against impact energy 0.15J
IK02 Protected against impact energy 0.,20J
IK03 Protected against impact energy 0.35J
IK04 Protected against impact energy 0.50J
IK05 Protected against impact energy 0.70J
IK06 Protected against impact energy 1.00J
IK07 Protected against impact energy 2.00J
IK08 Protected against impact energy 5.00J
IK09 Protected against impact energy 10.00J
IK10 Protected against impact energy 20.00J

 


Now you should be able to decipher any code you encounter.

It should also be noted that the IP Degree of protection is specified by the Standard EN 60529 which refers to protective enclosures of electrical equipment with nominal voltage of no more than 72.5 kV.

The mechanical protection is indicated by the standard EN 50102.

Now, when purchasing an electrical component, you can evaluate its characteristics appropriately with respect to its intended use.


Learn more
- Regulations: EN 60529
- Regulations: EN 50102

 

Rev.15.0126      

 

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