IP rating and technical guidance

IP ratings guide
IPxx
(ingress Protectuin to BS EN 60529)
1st digit - protection against solid objects
0 No protection
1 Protected against objects greater than 50mm
2 Protected against objects greater than 12mm
3 Protected against objects greater than 2.5mm
4 Protected against objects greater than 1.0mm
5 Ingress of dust is not totally prevented but dust does not enter in harmful quantities
6 No ingress of dust
IP rating guide
IPxx
2nd digit - protection against water
0 No protection
1 Protected against falling drops
2 Protected against drops falling at 15°
3 Low pressure spray - similar to shower head at up to 60° from vertical
4 Low pressure spray - similar to shower head - from any angle for 5 minutes
5 Medium pressure jet - similar to garden hose - from any angle for 3 minutes
6 High pressure jet - similar to fire hose - from any angle for 3 minutes
7 Submersion at 1 metre for 30 minutes
8 Higher water pressure eg: 2 bar for 2 hours. Conduits are tested in-house at up to 10 bar. (equivalent to 100m underwater)
  9 Steam clean, high pressure high temp jet wash to DIN40050.

Buyer beware

IP tests are type tests of short duration and do not guarantee long term performance. EN 60529 states that equipment conforming to to IP67 or IP68 cannot be assumed to meet IP66 and that the manufacturer shall declare the pressure and duration of the test, for example, FPAX 2 bar for 2 hours.

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