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IP Ratings explained

Posted by Peter Kennedy on 2/27/2018 to ABYC and USCG standards
IP stands for Ingress Protection and indicates the degree of protection provided by an enclosure. The rating is always a two digit number.  The first digit refers to protection from dust and solid particles, the second digit refers to protection from water. The dust scale goes from 0 to 6 and the water scale goes from 0 to 9.   A rating of IP00 has no protection against dust and water and a rating of IP69 has the maximum protection.

A fuller description of the ratings is available on Wikipedia and what follows is just a summary which I have interpreted to make it easier to read:

First Digit - Dust Protection

0     No protection
1     Protection against something bigger than a hand
2     Protection against something bigger than a finger
3     Protection against something bigger than a screwdriver
4     Protection against something bigger than a wire
5     Protected against dust
6     Completely sealed

Second Digit -  Water Protection

0     No protection
1     Drip protection
2     Drip protection when slightly tilted
3     Limited protection from sprayed water
4     Limited protection from splashing in any direction
5     Limited protection from jets of water
6     Protection from powerful jets of water
7     Protection from immersion for a limited time
8     Protection from immersion for an extended time
9     Protection from powerful high temperature water jets


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