IP (ingress protection) rating – IP code

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Definition

The IP (ingress protection) is a numerical measure according to EN 60529:2003, preceded by the IP symbol of the IP code and assigned to the enclosure of an electrical appliance where the enclosure provides:

  • protection to people against access or approach to live electrical parts or moving parts (other than smooth, rotating shafts) inside of the enclosure, and
  • protection of the enclosed electrical apparatus against ingress of solid foreign objects, and if specified so in the IP rating
  • protection of the enclosed electrical apparatus against harmful effects of ingress of water or other liquids.

Oznaczenie IP

The IP code / rating  (“International Protection Codes”,  “Ingress Protection Rating”)

An IP code features the prefix “IP” and a suffix two to four characters long..

  • The first suffix character is a characteristic numeral which denotes the resistance to penetration by solid objects.
  • The second suffix character is a characteristic numeral which denotes the resistance to penetration by water, e.g. IP44, IP67 – waterproof;
  • The third (additional) suffix character is an additional letter which denotes the degree of user’s protection against direct touching of live components;
  • The fourth (additional) suffix character is a supplementary letter.

Notes

  • Where a characteristic numeral is not required to be specified, it shall be replaced by the letter X (“XX” if both numerals are not required).
  • Additional letters and/or supplementary letters may be omitted without replacement.
  • Where more than one supplementary letter is used, the alphabetic sequence shall apply.
  • If an enclosure provides different degrees of protection for different intended mounting arrangements, the relevant degrees of protection shall be indicated by the manufacturer in the instructions related to the respective mounting arrangements.

Code example

IP

Code designation
International Protection

6

1st characteristic numeral

5

2nd characteristic numeral

C

Additional letter

H

Supplementary letter

First characteristic numeral – Degree of protection access to hazardous parts (direct touch protection) and from solid foreign objects

1st characteristic numeral Brief description Definition
0 Non-protected
Non-protected
1 Protection against access to
hazardous parts with the back of hand
The access probe, sphere dia.
50 mm, shall maintain adequate distance from hazardous parts
Protection against solid foreign objects
with a dia. 50 mm or larger
The object probe, sphere
dia. 50 mm, shall not fully penetrate
2 Protection against access to
hazardous parts with a finger
The jointed test finger
dia. 12 mm, 80 mm length, shall have adequate clearance from hazardous parts
Protection against solid foreign objects
with a dia. 12.5 mm or larger
The object probe, sphere
dia. 12.5 mm, shall not fully penetrate
3 Protection against access to
hazardous parts with a tool
The access probe, dia. 2.5
mm shall not penetrate
Protection against solid foreign objects
with a dia. 2.5 mm or larger
The object probe, dia.
2.5 mm shall not fully penetrate
4 Protection against access to
hazardous parts with a wire
The access probe, dia. 1.0
mm shall not penetrate
Protection against solid foreign objects
with a dia. 1.0 mm or larger
The object probe, dia.
1.0 mm shall not fully penetrate
5 Protection against access to
hazardous parts with a wire
The access probe, dia. 1.0
mm shall not penetrate
Dust-protected Ingress of dust is not
totally prevented, but dust shall not penetrate in a quantity to
interfere with satisfactory operation of the apparatus or to impair safety
6 Protection against access to
hazardous parts with a wire
The access probe, dia. 1.0
mm shall not penetrate
Dust-tight No ingress of dust
Key:
Colour Details of protection against access to to hazardous parts (direct touch protection)
Colour Details of protection against solid foreign objects
1) The full diameter of the object probe shall not pass through an opening of the enclosure.

Second characteristic numeral – Degree of protection against water

2nd characteristic numeral Brief description Definition
0 Non-protected
1 Protected against vertically falling water drops Vertically falling drops shall have no harmful effects
2 Protected against vertically falling water drops when enclosure tilted up to 15° Vertically falling drops shall have no harmful effects when the enclosure is tilted at any angle up to 15° on either side of the vertical
3 Protected against spraying water Water sprayed at an angle up to 60° on either side of the vertical shall have no harmful effects
4 Protected against splashing water Water splashed against the enclosure from any direction shall have no harmful effects
5 Protected against water jets Water projected in jets against the enclosure from any direction shall have no harmful effects
6 Protected against powerful water jets Water projected in powerful jets against the enclosure from any direction shall have no harmful effects
7 Protected against the effects of temporary immersion in water Ingress of water in quantities causing harmful effects shall not be possible when the enclosure is temporarily immersed in water under standardized conditions of pressure and time
8 Protected against the effects of continuous immersion in water Ingress of water in quantities causing harmful effects shall not be possible when the enclosure is continuously immersed in water under conditions which shall be agreed between manufacturer and user but which are more severe than for numeral 7

Additional letter – Degree of protection against access to hazardous parts – denotes the degree of user’s protection against direct touching of live components

Additional letter Brief description Definition
A Protected against access with the back of the hand The access probe, sphere dia. 50 mm, shall have adequate clearance from hazardous parts
B Protected against access with a finger The jointed test finger, of dia. 12 mm, 80 mm length, shall have adequate clearance form hazardous parts
C Protected against access with a tool The access probe of dia. 2.5 mm, 100 mm length, shall have adequate clearance from hazardous parts
D Protected against access with a wire The access probe of dia. 1.0 mm , 1 00 mm length, shall have adequate clearance from hazardous parts

Supplementary letter

Letter Significance
H High-voltage apparatus
M Tested for harmful effects due to the ingress of water when the movable parts of the equipment (for example, the rotor of a rotating machine) are in motion.
S Tested for harmful effects due to the ingress of water when the movable parts of the equipment (for example, the rotor of a rotating machine) are stationary.
W Suitable for use under specified weather conditions and provided with additional protective features or processes.

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