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Understanding IP Ratings

The Ingress Protection (IP) rating scheme is an internationally-recognised system of defining the degree of protection against the entry of solid and liquid objects.

It is a very simple system using two numbers to symbolise increasingly greater sealing from solid objects and from water.

For example, a product rated as being sealed to IP 44 will provide some degree of protection from penetration by dust and a splash of water, but it would not be expected to completely seal against all dust or being immersed in water.

1st IP # Protection against objects 2nd IP # Protection against liquid
0 No protection provided 0 No protection provided
1 Protected against solid objects of 50mm  1 Protected against vertically falling water drops
2 Protected against solid objects of 12.5mm 2 Protected against vertically falling water drops when enclosure tilted up 15° from its normal position
3 Protected against solid objects of 2.5mm 3 Protected against spraying water
4 Protected against solid objects of 1.0mm 4 Protected against splashing water
5 Protected against entry of dust in sufficient quantity to prevent satisfactory operation 5 Protected against water jets
6 Complete protection against dust (Dust tight) 6 Protected against powerful water jets from any direction
    7 Protected against the effects of total water immersion up to 1M
    8 Protected against the effects of total water immersion beyond 1M

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