IP ratings are the degrees of protection for electrical devices set down in IEC 529 and DIN 40 050. The rating comprises the letters IP followed by two single digit code numbers. The first number relates to physical protection (touch and ingress, including dust) and the second relates to protection against water. These codes are summarised here.
Protection against touching and ingress of foreign
bodies:
The first number indicates the degree of protection.
0 No particular protection
1 Protection against the penetration of solid foreign bodies with Ø > 50 mm. No protection against premeditated access, e. g. hands.
2 Protection against the penetration of solid foreign bodies with Ø > 12 mm. Fingers and objects similar must not touch the device.
3 Protection against the penetration of solid foreign bodies with Ø > 2.5 mm. Tools, wires and objects similar must be kept apart from the device if their thickness exceeds 2.5 mm.
4 Protection against the penetration of solid foreign bodies with Ø > 1 mm. Tools, wires and objects similar to them must be kept apart from the device if their thickness exceeds 1 mm.
5 Protection against harmful dust deposits. The penetration of dust cannot be totally avoided but the dust must not penetrate in such quantities that the operation of the device is negatively affected. Complete protection against touching.
6 Protection against the penetration of dust complete protection against touching.
Protection against ingress of water:
The second number indicates the degree of protection
0 No particular protection.
1 Protection against water dropping vertically onto the device. It must not have a harmful effect.
2 Protection against water dropping vertically. It must not have a harmful effect to devices (housing) tipped up to 15° against their normal position.
3 Protection against water dropping in any angle up to 60° of the vertical line. It must not have a harmful effect.
4 Protection against water squirting onto the device from any direction. It must not have a harmful effect.
5 Protection against a jet of water coming out of a nozzle which is directed on to the device (housing). It must not have a harmful effect.
6 Protection against heavy sea or a strong jet of water. It must not penetrate the device (housing) in harmful quantities.
7 Protection against water if the device is held under water and if predetermined time and pressure conditions are applied. It must not penetrate the device in harmful quantities.
8 The device can be held under water continuously. The conditions have to be quoted by the manufacturer.
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