The IP system is an internationally recognized method to indicate the degree of protection against the ingress of dust, solid objects and moisture into an enclosure. The letters “IP” are followed by two numerals.
First Numeral – Objects and Dust
|1||Protected against solid objects 50 mm in diameter or greater.
A large surface of the body, such as a hand (no protection against deliberate access).
|2||Protected against solid objects 12 mm in diameter or greater.
Fingers or similar objects not exceeding 80mm in length.
|3||Protected against solid objects 2.5 mm in diameter or greater.
Tools, wires, etc., of diameter or thickness greater than 2.5 mm.
|4||Protected against solid objects 1mm in diameter or greater.
Wires or other similar solid material of thickness greater than 1mm in diameter.
Dust does not enter in sufficient quantity to interfere with satisfactory operation of equipment.
No ingress of dust.
Second Numeral – Water and Moisture
|1||Protected against dripping water.
Dripping water (vertically falling drops) shall have no harmful effect.
|2||Protected against dripping water when tilted up to 15°.
Vertically dripping water shall have no harmful effect when the enclosure is tilted at an angle up to 15º from its normal position.
|3||Protected against spraying water.
Water falling as a spray at any angle up to 60° from the vertical shall have no harmful effect.
|4||Protected against splashing water.
Water splashing against the enclosure from any direction shall have no harmful effect.
|5||Protected against water jets.
Water projected by a nozzle against enclosure from any direction shall have no harmful effects.
|6||Protected against heavy seas.
Water from heavy seas or projected in powerful water jets shall not enter the enclosure in harmful quantities.
|7||Protected against the effects of temporary immersion.
Ingress of water in harmful quantity shall not be possible when the enclosure is immersed in water under
defined conditions of pressure and time.
|8||Protected against continuous immersion.
The equipment is suitable for continuous submersion in water under conditions which shall be specified
by the manufacturer.