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Technical information -
Degree of protection

The degrees of protection set out by standard EN 60529 provide information about the level to which electrical equipment - in our case signalling devices - is protected against the effects of solid foreign objects and against the ingress of liquid by the casing or covers.

The degrees of protection are indicated by a code which always consists of the two letters 'IP' plus two numbers that represent the level of protection. The most common degrees of protection given to Auer Signal products are IP 65, IP 66 and IP 67.

The table below provides an overview of what the IP degree of protection numbers mean and how they are put together:

First number

Protection against foreign objects

Second number

Protection against liquid

0 No protection

No special protection stopping people directly touching active or moving parts; no protection for the equipment against the ingress of solid foreign objects

0 No special protection

1 Protection against
large foreign objects

Protection against the ingress of solid foreign objects
with a diameter of more than 50 mm, e.g. hands

1 Protection against dripping water - falling vertically

Dripping water falling vertically should not have a harmful effect

2 Protection against
medium-sized foreign objects

Protection against the ingress of solid foreign objects
with a diameter of more than 12 mm, e.g. fingers

2 Protection against dripping water - falling at an angle

Dripping water falling at any angle up to 15 degrees to the vertical should not have a harmful effect

3 Protection against
small foreign objects

Protection against the ingress of solid foreign objects
with a diameter of 2.5 mm, e.g. tools, wires

3 Protection against spraying water

Dripping water falling at any angle up to 60 degrees to
the vertical should not have a harmful effect

4 Protection against
granular foreign objects

Protection against the ingress of solid foreign objects with a diameter of more than 1 mm, e.g. fine tools, small wires

4 Protection against splashing water

Water splashing against the equipment from all directions should not have a harmful effect

5 Protection against
dust deposits

Fully protected against dust deposits: The ingress of dust is not completely ruled out, but does not impair the functionality of the device

5 Protection against water jets

A jet of water from any direction should not have a harmful effect

6 Protection against
ingress of dust

Fully protected against the ingress of dust

6 Protection against flooding

A harmful amount of water should not enter the equipment in the event of temporary flooding

7 Protection in the event of immersion

A harmful amount of water should not enter the equipment when it is immersed in water under the specified pressure and time conditions

8 Protection in the event of deep immersion

A harmful amount of water should not enter the equipment when it is immersed under water