IP rating
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What is an IP rating?
IP rating is used to define levels of sealing effectiveness of electrical enclosures against intrusion from foreign bodies (tools, dirt etc) and moisture. It also be recognized by most European countries and in IEC 529 (BS EN 60529: 1992) packaging Degree of protection (IP code) announced.

What do the numbers in an IP Rating mean?
 The first number indicates for the protection of enclosed equipment from dust. The second number defines for the protection level that the enclosure device from various forms of moisture (drips, sprays etc). The tables below should help make sense of it:
Number First Number - solid First Number - liquid
0 No special protection No special protection
1 Protection from solid objects greater than 50mm in diameter.  ex: hands Can withstand a vertical drop of water.
2 Protection other object greater than 12mm in diameter or length not more than 80mm. ex: fingers Can withstand water droplets deflected up to 15° from vertical.
3 Protection from solid objects greater than 2.5 mm in diameter.  ex: tools, wires etc. Can withstand water spraying up to 60° from vertical.
4 Protection from solid objects greater than 1.0 mm in diameter.  ex: small metal wires. Can withstand water spraying from all directions.
5 Protected against dust that may harm equipment. Can withstand low pressure water jets from all directions.
6 Totally dust tight. Can withstand powerful jet of water and waves.
7 no application Enclosure device can withstand temporary immersion.
8 no application Protected against prolonged effects of immersion under pressure.