0 Non protected, No special protection
1 Protected against falling water Equivalent to 3-5mm rainfall per minute for a duration of 10 minutes. Unit is placed in its normal operating position.
2 Protected against falling water when tilted up to 15 degrees. Same as (1) above but unit is tested in 4 fixed positions - tilted 15 degree in each direction from normal operating position.
3 Protected against spraying water, Water spraying up to 60 degrees from vertical at 10 liters/min at a gauge pressure of 80-100kN/m2 for 5 min.
4 Protected against splashing water. Same as level 3 but water is sprayed at all angles.
5 Protected against water jets Water projected at all angles through a 6.3mm nozzle at a flow rate of 12.5 liters/min at a gauge pressure of 30kN/m2 for 3 minutes from a distance of 3 meters.
6 Protected against heavy seas. Water projected at all angles through a 12.5mm nozzle at a flow rate of 100 liters/min at a gauge pressure of 100kN/m2 for 3 minutes from a distance of 3 meters.
7 Protected against water immersion. Immersion for 30 minutes at a depth of 1 meter.
8 Protected against water submersion The equipment is suitable for continuous submersion in water under conditions which are identified by the manufacturer.