IP (Ingress Protection rating) is an international standard for protecting the shell (shell) of electrical and electrical equipment from the harmful effects of the environment. According to the accepted classification, the degree of protection IP, which corresponds to certified equipment, is accompanied by a two-digit number - for example, IP20, IP44, IP54, IP65, IP68.

The first digit IP is the degree of protection against mechanical damage, and more precisely against the penetration and impact of solid objects.

• IP0x - no protection against mechanical damage.
• IP1x - protection against penetration of objects> 50 mm (for example, accidental contact with hands).
• IP2x - protection against penetration of objects> 12 mm (for example, pressing a finger).
• IP3x - protection against penetration of objects> 2.5 mm (for example, tools, wires).
• IP4x - protection against penetration of objects> 1 mm (for example, tools, small wires).
• IP5x - partial protection against dust (penetrating amount does not interfere with the operation of the device).
• IP6x - full protection against dust. Dustproof.

The second digit IP is a class of protection against penetration of moisture or water into the body.

• IPx0 - no protection against the ingress of moisture into the case.
• IPx1 - protection against vertically falling drops of water.
• IPx2 - protection against splashing water, with a deflection angle of up to 15 ° from the vertical.
• IPx3 - protection against splashing water, with a deflection angle of up to 60 ° from the vertical.
• IPx4 - protection against splashing water from any direction.
• IPx5 - protection against water flows from any direction.
• IPx6 - protection against water flow or strong jets from any direction.
• IPx7 - protection for partial or short-term immersion in water to a depth of 1 m.
•  IPx8 - protection with full and long-term immersion in water to a depth of more than 1 m.

Thus, the larger the specified two-digit number, the higher the degree of protection of equipment from the harmful effects of the environment. For example, IP65 protection class - full protection against dust and protection against water jets in any direction.
If the equipment specification contains 0 in the standard (in the first or second digit of the IP standard), this means that this technical tool does not provide protection against mechanical damage (IP0-) or from moisture penetration (IP-0).