IP ratings classify how well a motor is protected against the ingress of solid particles and liquids. In simple terms, they indicate the effectiveness of the motor’s sealing.
IP ratings: Solids
The first number of an IP rating refers to the ability of a motor to resist the ingress of solids such as dirt and dust, tools, or even fingers. This number ranges from one to 6, with 1 offering the lowest, and 6 offering the highest level of protection.
IP ratings: Liquids
The second number refers to the ability of a motor to resist the ingress of liquids. This number ranges from 1 to 8, with 1; motor is only protected from vertically falling water, while at 8 it is protected against complete immersion in water over long periods of time.
IP ratings: X and K
Additionally, IP ratings can contain an X (e.g. IPX3) if a motor either was not tested at all for either solid or liquid ingress, or if the test data was inconclusive. A zero can also be used in place of an X.
In IP ratings, the symbol "K" indicates resistance to high-pressure and high-temperature water. The letter "K" refers only to water conservation (second digit).
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