The IP value indicates the degree to which electrical appliances like lighting fixtures are protected against solid objects or materials, and water. The IP value always consists of two digits.
The first digit indicates the protection against solid objects or materials. The second digit indicates the degree to which the fixture is protected against water.
Logically it makes sense that when the appliance is well protected against water, it is also hard for solid objects to invade the appliance. A high second digit is therefor always accompanied with a high first digit.
A lighting fixture you want to install in the bathroom logically asks a higher IP value. The bathroom can be divided into four imaginary safety zones each with their own requirements in terms of IP value.
The first IP digit:
The second IP digit:
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