The IP Index is a reference, but does not constitute absolute impermeability in real-life conditions.
Every application has characteristics that can affect the safety or correct operation of an electrical appliance. Known in good engineering practice as ‘external influences’, they fall into one of three categories: construction, application, or environment.
Prior knowledge of external influences is essential when selecting the equipment to be installed.
The IEC/EN 60529 standard “Degrees of protection provided by enclosures (IP Index)” defines the test conditions, procedures and penalties for qualifying impermeability.