The IP (Ingress Protection) rating system is published by the IEC (International Electrotechnical
Commission) and classifies the degree of protection against solid objects and liquids in order
to operate the electrical equipment.
Second digit of IP-Codes
2.digit Meaning
ISO 20653 IEC 60529 Protection against water
0 0 No protection
1 1 Dripping water (vertically falling drops) shall have no harmful effect.
2 2 Vertically dripping water shall have no harmful effect when the enclosure is tilted at an angle
up to 15° from its normal position.
3 3 Water falling as a spray at any angle up to 60° from the vertical shall have no harmful effect.
4 4 Water splashing against the enclosure from any direction shall have no harmful effect.
5 5 Water projected by a nozzle (6.3 mm) against enclosure from any direction shall have no har-
mful effects.
6 6 Water projected in powerful jets (12.5 mm nozzle) against the enclosure from any direction
shall have no harmful effects.
7 7 Ingress of water in harmful quantity shall not be possible when the enclosure is immersed in
water under defined conditions of pressure and time (up to 1 m of submersion).
8 8
The equipment is suitable for continuous immersion in water under conditions which shall
be specified by the manufacturer. Normally, this will mean that the equipment is hermetically
sealed. However, with certain types of equipment, it can mean that water can enter but only in
such a manner that it produces no harmful effects.
9 Protected against close-range high pressure, high temperature spray downs.
9K Protected against close-range high pressure, high temperature spray downs, specific for cars.
First digit of IP-Codes
1.digit Meaning
ISO 20653 IEC 60529 Protection against objects Effective against
0 0 No protection No protection
1 1 Solid objects 50mm Any large surface of the body, such as the back of a hand, but
no protection against deliberate contact with a body part
2 2 Solid objects 12.5mm Fingers or similar objects
3 3 Solid objects 2.5mm Tools, thick wires, etc.
4 4 Solid objects 1mm Most wires, screws, etc.
5K 5 Dust protected
Ingress of dust is not entirely prevented, but it must not enter
in sufficient quantity to interfere with the satisfactory opera-
tion of the equipment; complete protection against contact
6K 6 Dust tight No ingress of dust; complete protection against contact
IP XX
1 2
1 Protection Against Solid Objects
2 Protection Against Liquids
> Protection class
7