The EN ISO 20653 standard (“IP degree of protection – Road vehicles”), specific for the automotive sector, defines the same figures for the IP degree cited by the CEI EN 60529 standard but introduces the code “K”, which describes special requirements for road vehicles that are not covered by the CEI EN 60529 standard. In particular it defines:
IP5KX = IP5X of the CEI EN 60529 standard
IP6KX = IP6X of the CEI EN 60529 standard
IPX4K = protected against pressurized water sprays
IPX6K = protected against strong high pressure water jets (flooding)
IPX9K = protected against water in case of high pressure jets/steam cleaning
Generally the degrees of protection are matched for both digits, the most common are:
IP44: Protection against the penetration of solid bodies larger than 1 mm. Protection against splashes in any direction.
IP54: Protection against the access of dust. Protection against water jets penetrating in any direction. The penetration of dust and liquids must not damage the equipment.
IP65: Total protection against dust. Protection against powerful jets of water in any direction. Liquid penetration must not damage the equipment.
IP67: Total protection against dust. Protection against temporary immersion in water for 30 minutes at a depth of 1 metre.
IP 68: Total protection against dust. Protection against permanent immersion in water over 1 meter deep, in this case the manufacturer must specify the maximum depth to which its casing can be subjected.
IP 69K: Total protection against dust. Maximum protection of the tested sample against water penetration, even in high pressure or steam cleaning systems.