The Ingress Protection (IP) Code, prepared by the International Electrotechnical Commission (IEC), is a system for classifying the degrees of protection provided by the enclosures of electrical equipment. The system was intended to establish a uniform method for describing the protection provided by the enclosure. The numbers in the IP code describe the various levels of protection.
The IP rating uses two numbers to describe how well the unit is protected against dust and water. The first number (1 to 6) measures dust protection; the second number (1 to 8) describes water protection.