IP – Ingress Protection Rating

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A two-digit number established by the International Electro Technical Commission, is used to provide an Ingress Protection rating to a piece of electronic equipment or to an enclosure for electronic equipment.

The IP rating normally has two (or three) numbers:

  1. Protection from solid objects or materials
  2. Protection from liquids (water)
  3. Protection against mechanical impacts (commonly omitted, the third number is not a part of IEC 60529)

 

IP First number – Protection against solid objects

0 No special protection
1 Protected against solid objects over 50 mm, e.g. accidental touch by persons hands
2 Protected against solid objects over 12 mm, e.g. persons fingers
3 Protected against solid objects over 2.5 mm (tools and wires)
4 Protected against solid objects over 1 mm (tools, wires, and small wires)
5 Protected against dust limited ingress (no harmful deposit)
6 Totally protected against dust

IP Second number – Protection against liquids

0 No protection
1 Protection against vertically falling drops of water e.g. condensation
2 Protection against direct sprays of water up to 15o from the vertical
3 Protected against direct sprays of water up to 60o from the vertical
4 Protection against water sprayed from all directions – limited ingress permitted
5 Protected against low pressure jets of water from all directions – limited ingress
6 Protected against temporary flooding of water, e.g. for use on ship decks – limited ingress permitted
7 Protected against the effect of immersion between 15 cm and 1 m
8 Protects against long periods of immersion under pressure

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