Ingress Protection Rating

The IP-Rating provides a classification of protection of an instrument from dust and water

The format for the I.P. rating is indicated by two numbers. The first numeral indicates access to dangerous parts and protection of internal equipment. The second numeral indicates protection of internal equipment against harmful ingress of water. In general, the standard aims to provide users with more detailed information that vague terms such as waterproof.  

First Digit: Solids (IP XX) 

The first digit indicates the level of protection that the enclosure provides against access to hazardous parts (e.g., electrical conductors, moving parts) and the ingress of solid foreign objects. 

Level Object size protected against Effective Against
0 Not Protected No Protection against contact and ingress of objects
1 >50mm Any large surface of the body, such as the back of the hand, but no protection against deliberate contact with body part
2 >12.5mm Fingers or similar objects
3 >2.5mm Tools, Thick wires, etc.
4 >1mm Most wires, screws, etc.
5 Dust Protected Ingress of dust is not entirely prevented, but it must not enter in sufficient quantity to interfere with the satisfactory operation of the equipment; complete protection against contact. 
6 Dust Tight No ingress of dust; complete protection against contact.

Second Digit: Liquids (IP XX)

Protection of the equipment inside the enclosure against harmful ingress of water.

Level Object size protected against Effective against
0 Not protected -
1 Dripping water Dripping watter (vertically falling drops) shall have no harmfull effect.
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
4 Splashing water Water splashing against the enclosure from any direction shall have no harmful effect
5 Water jets Water projected by a nozzle (6.3mm) against enclosure from any direction shall have no harmful effects.
6 Powerful water jets Water projected in powerful jets (12.5mm nozzle) against the enclosure from any direction shall have no harmful effects.
7 Immersion up to 1m Ingress of water in a harmful quantity shall not be possible when the enclosure is immersed in water under defined conditions of pressure and time (up to 1m of submersion).
8 Immersion beyond 1m 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.


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