The Ingress Protection (IP) code for electrical equipment (IEC 60529) has 2 codes. The first indicates resistance to solid and the second resistance to water.
First Digit
Size
Protection
0
any
none
1
> 50 mm
large surfaces or objects
2
> 12.5 (12.6-50)
hand sized, tools
3
> 2.5 (2.6 to 12.5)
small tools or thick wires
4
> 1 (1.1 to 2.50)
small objects
5
dust < 1 mm
dust resistant
6
dust
dustproof
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