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Protection Rating Class Guide

There are many levels and classifications of protection class, these are summarized by a standard code (called an "Ingress Protection Rating" or "IP code" for short), this code can be broken down into 5 sections.

 

Part 1 - Identification - Mandatory

All IP codes start with the letters IP to allow identification at a glance and to aid computer searches.

Part 2 - Solid particle protection - Mandatory

The first number, an integer value between 0 (none) and 6 (dust tight) indicates the level of protection that the enclosure provides against access to hazardous parts (electrical conductors, moving parts) and the ingress of solid foreign objects.
Rating Foreign Object Size Written Description
0 N/A No protection against contact or ingress provided
1 >50 mm Accidental Contact Prevention, protection for any object roughly the size of the back of a hand, but no protection against deliberate contact with a body part or tool
2 >12.5 mm Intentional Contact Prevention, fingers or similarly sized objects
3 >2.5 mm Tooling resistant, protection for any object roughly the size of screw drivers, thick wires, etc.
4 >1 mm Small object protection, electrical wires, small screws, etc.
5 Dust protected Ingress of dust is not entirely prevented, but it will not enter in sufficient quantity to interfere with the satisfactory operation of the equipment. Complete protection against any foreign object contact.
6 Dust tight No ingress of dust. Complete protection against any contact

Part 3 - Liquid ingress protection - Mandatory

The second number, an integer value between 0 (none) and 8 (continuous immersion) indicates the level of protection that the enclosure provides against the ingress of water.
Rating Protected against Written Description
0 None No protection against contact or ingress provided
1 Dripping water Vertically falling drops of water shall have no harmful effect on operation.
2 Dripping water when tilted up to 15° Vertically dripping water shall have no harmful effect when the enclosure is tilted at an angle up to 15° from its normal position.
3 Spraying water Water falling as a spray at any angle up to 60° from the vertical shall have no harmful effect on operation.
4 Splashing water Water splashing against the enclosure from any direction shall have no harmful effect on operation.
5 Water jets Water projected by a nozzle (6.3mm) against enclosure from any direction shall have no harmful effects on operation.
6 Powerful water jets Water projected in powerful jets (12.5mm nozzle) against the enclosure from any direction shall have no harmful effects on operation.
7 Immersion up to 1 m Ingress of water in harmful quantity shall not be possible when the enclosure is immersed in water under defined conditions of pressure and time (up to 1 m of submersion).
8 Immersion beyond 1 m The equipment is suitable for continuous immersion in water under conditions which shall be specified by the manufacturer. Normally, this will mean that the equipment is hermetically sealed. However, with certain types of equipment, it can mean that water can enter but only in such a manner that it produces no harmful effects.


Part 4 - Mechanical impact resistance - Obsolete

An additional number has been used to specify the resistance of equipment to mechanical impact. This mechanical impact is identified by the energy needed to qualify a specified resistance level, which is measured in joules (J). This has now been superseded by the separate IK number specified in EN 62262.

Part 5 - Additional Information - Optional

Letter Written Description
H High voltage device
M Device moving during water test
S Device standing still during water test
W Weather conditions