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What do IP Ratings mean?

J&R Technology Ltd | Updated: Jul 20, 2018

When some engineers desire to purchase a weatherproof telephone, they often confuse what type of rating they need to look for. For figure out, there are several rating systems have been developed, and several testing agencies that verify the results. Here, we will deal only with the IP system.

Then, what do IP ratings mean? IP ratings (Ingress Protection), which are most frequently used in Europe, Asia, and North America, were developed by the International Electrotechnical Commission (IEC). Because these are international standards, the testing is often certified by the TÜV instead of UL, although both furnish rigorous testing. IP Ratings apply to enclosures such as our telephone shell. They indicate how the enclosure protects against water and dust ingress, the higher the better.

The numbers denote how well a product is resistant to solid objects/particles and liquids. The first digit is in the range 0-6 and the second ranges from 0-8. An "X" can be substituted for one of the digits if there is only one class of protection.

The chart below gives the specifics of what these ratings mean.


( the First digit recognises the mechanical protection)


( the Second digit illustrates the level of water 

ingress protection )


No special protection


No special protection


Protection from solid objects 

( greater than 50 mm in diameter )


Protection from dripping water


Protection against solid objects 

not greater than 80 mm in length 

and 12 mm in diameter


Protection from vertically dripping water


Protection from entry by solid 

objects with a diameter of greater 

than 2.5 mm


Protection from sprayed water


Protection from entry by solid 

objects with a diameter or 

thickness greater than 1.0 mm


Protection from splashed water


Protection from the amount of 

dust that would interfere with the 

operation of the equipment


Protection from water projected from a nozzle


Dust tight


Protection against heavy rain, or powerful 

jets of water


Protection against immersion


Protection against complete, continuous 

submersion in water

IP67 watertight telephone.jpg

Such as our industrial telephones, the typical "waterproof" IP rating are IP65, IP66 and IP67.

The chart below gives the specifics of how they are measured.

IP Rating



Test Method


Able to protect against water jets

Water projected by a nozzle (6.3 mm) against enclosure from any direction shall have no harmful effects.

Test duration: at least 15 minutes

Water volume: 12.5 litres per minute

Pressure: 30 kPa at distance of 3 m


Able to protect against powerful water jets

Water projected in powerful jets (12.5 mm nozzle) against the enclosure from any direction shall have no harmful effects.

Test duration: at least 3 minutes

Water volume: 100 litres per minute

Pressure: 100 kPa at distance of 3 m


Able to protect 

against Immersion 

up to 1 m

Ingress of water in harmful quantity shall not be possible when the enclosure is immersed in water under defined conditions of pressure and time (up to 1 m of submersion).

Test duration: 30 minutes

Immersion at depth of at least 1 m measured at bottom of device, and at least 15 cm measured at top of device

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