IP protection ratings chart

Written by Ian on 15/10/08


IP actually stands for "International Protection", although many people like me thought it stood for Ingress Protection (which is actually far more accurate in its description!!).
• It is part of AS1939-1086.

So any IP rating is made up of two numbers.
• Let's call this:

IPab

The first
number, a, refers to protection of persons against access (like touching dangerous parts), and against the entry of objects from large down to dust sized into a system. Here is a list of meanings for a:

X - unspecified (or untested)

0 - no special protection provided

1 - prevents a human hand, and objects larger than 50mm in smallest dimension from accessing any dangerous parts

2 - prevents human fingers, and objects larger than 12mm in smallest dimension from accessing any dangerous parts

3 - prevents objects larger than 2.5mm in smallest dimension from accessing any dangerous parts

4 - prevents objects larger than 1mm in smallest dimension from accessing any dangerous parts

5 - prevents entry of dust from interfering with normal operation of the equipment

6 - complete prevention of the entry of dust


The second number, b, refers to protection of the equipment against water ingress. Here is a list of meanings for b:

X - unspecified (or untested)

0 - no special protection

1 - protection against vertically dripping water

2 - as 1, but still protected even when the device is tilted at 15° from the horizontal

3 - as 1, but still protected even when the device is tilted at 60° from the horizontal, and when the water is sprayed rather than just dripped

4 - protects against water splashed or sprayed from all directions

5 - protects against a low-pressure jet of water from any direction

6 - protects against a strong jet of water from any direction, and against heavy seas

6D - protects against a driving rain from any direction down to the horizontal

7 - protection against immersion with the highest part of the unit no more than 15cm below the surface, and the lowest part of the unit no deeper than 1 metre

8 - protection against submersion, depth must be specified separately (but is always more stringent than level 7!)

I hope you find this useful!
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