The mechanical design of luminaires must be such that they are adequately protected against the ingress of foreign bodies and moisture. the degree of protection is indicated by the IP numbering system."Ingress Protection"
The first numeral indicates the degree of protection against foreign bodies, the second numeral protection is against water.
An IP 20 luminaires , for example , is protected against the ingress of foreign bodies >12mm (2).but not against moisture (0).
A luminaire designed for use in damp interiors,with a degree of protection of IP 65 is protected against dust (6) and against jets of water (5).
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