Page 835 - Motor_protection_and_control_Manual_motor_starters_ contactors

Degrees of protection

General
In an installation, the degree of protection required for electrical equipment depends on the environmental characteristics. The degree of protec-
tion, ensured by the enclosure of equipment or by the cubicle containing the equipment is expressed by the IP code which gives the level of pro-
tection against access to hazardous parts, the ingress of foreign bodies and/or the ingress of water, in compliance with IEC 60529, IEC 60947-1.
Besides the IP symbol, the complete code has two figures followed (optionally) by two additional letters. A short description of the elements used
in IP coding is given below.

IP... code Figures Specifications for installation protection Protection of persons
or letters
First figure Against ingress of foreign bodies Against access to hazardous parts with:
0 No protection No protection
1 Diameter > 50 mm Back of hand
2 Diameter > 12.5 mm Finger
3 Diameter > 2.5 mm Tool
4 Diameter > 1 mm Wire
5 Limited protection against dust Wire
6 Total protection against dust Wire
Second figure Against entrance of water having a harmful effect
0 No protection
1 Vertical dripping
2 Dripping at a vertical angle of < 15°
3 Rain at a vertical angle of < 60°
4 Splashing
5 Low pressure water jet
6 Powerful water jets
7 Temporary immersion
8 Permanent immersion
Additional letter (optional) for use with: Against ingress of foreign bodies Against access to hazardous parts with:
First figure 0 A Stopped by a barrier with a 50 mm Ø sphere Back of hand
First figure 0 or 1 B Entrance of test finger limited to 80 mm Finger
First figure 1 or 2 C Wire with 2.5 mm Ø and length of 100 mm Tool
First figure 2 or 3 D Wire with 1 mm Ø and length of 100 mm Wire
Additional letter (optional) Specific additional information
H High voltage apparatus –
M Moving parts which are moving during water test
S Moving parts which are stationary during water test
W Specified atmospheric conditions
Note: The type of enclosure or cubicle in which the equipment must be installed prevails with respect to the degree of protection.

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