The IP rating (Ingress Protection rating) is a standard that describes the degree of protection provided against the intrusion of solid objects, dust, accidental contact, and water in electrical enclosures. The IP rating is typically followed by two numbers. The first number refers to the protection against solid objects and dust, while the second number refers to protection against liquids.

For an IP30 rating:

+ The first digit "3" means the device is protected against solid objects greater than 2.5mm in diameter. This means that most large tools, thick wires, and similar objects won't be able to penetrate it. However, it offers no protection against smaller particles like dust.

+ The second digit "0" means there's no protection against liquids.

So, an IP30 rated enclosure is protected against larger objects (like tools) but is not dust-tight and has no specific protection against any form of liquid ingress.

IP30 is a rating in the International Protection (IP) code system, which classifies the degree of protection provided by enclosures for electrical equipment. The IP code is defined in the international standard IEC 60529.

The "IP" stands for "Ingress Protection." The first digit, "3", indicates the level of protection against solid objects, in this case, objects larger than 2.5 mm in diameter, such as tools and wires. The "0" as the second digit means that there is no protection against water ingress.

So, an enclosure rated as IP30 is protected against solid objects larger than 2.5 mm but is not protected against water ingress. This level of protection is commonly found in indoor electrical equipment where water exposure is not a concern.