In the IP rating system, what does the first number represent?

The first number in the IP (Ingress Protection) rating system specifically indicates the level of protection a device has against solid objects, which includes dust. This number ranges from 0 to 6, where 0 means no protection and 6 signifies complete protection against dust ingress. Therefore, a higher number reflects better dust resistance, making it crucial for identifying how well an electronic device is safeguarded against particulate matter.

In contrast, the second number of the IP rating pertains to the device's level of protection against moisture and water ingress. As such, understanding the distinction between these two aspects of the rating is vital for determining the suitability of equipment for particular environments.