What are Power Supply IP Ratings?


Power Supplies will often have been given an IP rating, particularly in cases where the power supply is intended for use externally. These 'IP' or 'Ingress Protection' ratings denote how well a power supply protects itself from damage from external intrusion of solid objects and water.

An IP rating starts with the letters IP and is then followed by two numbers (and sometimes an optional letter). This is fully defined in standard IEC 60529. The purpose of IP rating is to provide the end user with a detailed description of a units capability rather than relying on vague terms such as 'waterproof' or 'suitable for outdoor use'. 

The most common IP ratings for power supplies intended for outdoor use are IP65, IP67 and IP68. The first number, in these examples this being the number 6 denotes 'Protected from total dustr ingress'. The final number refers to what level of protection from liquid ingress is provided

IP65 = Protection from total dust ingress & Protection from low pressure water jets from any direction
IP67 = Protection from total dust ingress & Protection from immersion between 15cm and 1 metre in depth
IP68 = Protection from total dust ingress & Protection from long term immersion up to a specified pressure. 

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