First Digit (Protection against ingress of solid bodies)
0 Non-Protected
1 Protected against solid objects greater than 50mm diameter
2 Protected against solid objects greater than 12mm diameter
3 Protected against solid objects greater than 2.5mm diameter
4 Protected against solid objects greater than 1mm diameter
5 Dust-protected
6 Dust-tight
Second Digit (Protection against ingress of moisture)
0 Non-Protected
1 Protected against dripping water falling vertically greater than 50mm diameter
2 Protected against dripping water when the luminaire is tilted up to 15 degrees from its normal position
3 Protected against spraying water falling on the luminaire at any angle up to 60 degrees from the vertical
4 Protected against splashing water from any angle
5 Protected against water jets from any direction
6 Protected against powerful water jets
7 Protected against immersion in water under defined conditions
8 Protected against continuous submersion under manufacturers specified conditions