IP classifications (Ingress Protection or International Protection ratings) are used to indicate the degree to which electrical and electronic devices are protected against the intrusion of solid objects (such as dust) and liquids (such as water). The classification consists of the letters "IP" followed by two digits. Each digit represents a specific level of protection.

In the context of server and patch cabinets, IP classifications can be important to determine whether the cabinets are suitable for use in dusty or humid environments, such as an outdoor setup or a room with high humidity. For example:

• IP20: Suitable for dry, indoor environments where little dust or liquids are present.
• IP55: Suitable for industrial environments where protection against dust and water is necessary.