What do the two sets of numbers after the IP mean?

The four digits of an IP address represent the network type, network range, network bits, and host bits. An IP address is made up of 32 bits of binary digits, and every 8 bits represents a decimal number ranging from 0 to 255.

For example, binary is expressed as.

An IP address is composed of two parts: the network address and the host address. The network address can be used to identify the network where the device is located, and the host address is located at the back end of the IP address to identify the device on the network.

1. Class A IP address.

A Class A IP address consists of a 1-byte network address and a 3-byte host address, the highest bit of the network address must be "0", and there are 126 Class A networks available, each of which can accommodate 1677214 hosts.

2. Class B IP address.

A Class B IP address consists of a 2-byte network address and a 2-byte host address, with the highest bit of the network address having to be "10".

3. Class C IP address.

A Class C IP address consists of a 3-byte network address and a 1-byte host address, and the highest bit of the network address must be "110", and the Class C network can reach 2097152, and each network can accommodate 254 hosts.

The protection level IP is followed by two digits, the first one is the dustproof level, and the last one is the waterproof level. The waterproof level is expressed as X, which means that there is no waterproof measure for this appliance, but it can be set according to the needs of the order.

The IP (Ingress Protection) protection rating system was drafted by the International Electronic Technical Commission (IEC). Electrical appliances are graded according to their dust-proof and moisture-proof characteristics. The external objects referred to here, including tools, human fingers, etc., should not touch the live parts of the electrical appliances to avoid electric shock.

The IP protection level is composed of two numbers, the first number indicates the level of dust removal and prevention of foreign object intrusion of the equipment, and the second number indicates the degree of sealing of the lamp against moisture and waterproof invasion, and the larger the number, the higher the protection level.

The first digit in IP4X means: Prevent the intrusion of solid foreign objects larger than the diameter or thickness of tools, wires and similar small foreign objects that may come into contact with the inside of the appliance.

0 No protection No special protection against people or things in the outside world.

1 Prevent the intrusion of solid foreign objects larger than 50mm Prevent the human body (such as the palm of the hand) from accidentally touching the internal parts of the electrical appliance, and prevent the intrusion of larger size (diameter greater than 50mm).

2 Prevent the instruation of large solid foreign objects Prevent human fingers from touching the internal parts of the electrical appliance, and prevent the incursion of medium-sized foreign objects larger than the diameter of the electrical appliance.

3. Prevent the intrusion of solid foreign objects larger than the diameter or thickness of tools, wires and similar small foreign objects that may come into contact with the internal parts of the molded electrical appliance.

4 Prevent the intrusion of solid foreign objects larger than the diameter or thickness of tools, wires and similar small foreign objects that may come into contact with the internal parts of the electrical appliance.

5 Prevent foreign objects and dust Completely prevent the intrusion of foreign objects, although it cannot completely prevent dust ingress, but the amount of dust intrusion will not affect the normal operation of electrical appliances.

6 Prevent foreign objects and dust Completely prevent the instruation of foreign objects and dust.

IP is the (enclosure) protection class, the first number indicates the protection against foreign objects, and the second number indicates the protection against water。For example, the first 2 means to prevent the incursion of solid objects larger than 12mm, to prevent human fingers from touching the parts inside the lamp, and to prevent the intrusion of medium-sized (12mm in diameter) foreign objects.

The first feature number after IP** has protection against dangerous parts, why do you need to add additional letters to vertical search kai? This is because, if the protection of the dangerous part is actually higher than the protection level indicated by the first characteristic number, and it is not necessary to increase the first characteristic number requirement, because increasing the first characteristic number requirement means improving the ability to prevent the entry of solid foreign objects.

As a result, poor ventilation and heat dissipation and processing difficulties are increased. In this case, consideration may be given to setting up a feature letter that specifically represents the dangerous part of the danger to prevent people from approaching, i.e., additional letters. For example, IP2XC, IP2X means that objects with a diameter greater than or equal to cannot enter, and also means that fingers cannot approach dangerous parts, that is, there is enough gap between the hinged test finger with a diameter of 12mm and a length of 80mm and the dangerous parts.

If it is considered that this is not strict enough to prevent the protection from approaching the dangerous part, add the letter C after it to indicate that the tool cannot approach the dangerous part, even if the test is tested with a diameter of 100mm, it also maintains sufficient clearance from the dangerous part. This also means that even the smallest screwdriver can be inserted into dangerous areas, which prevents electric shock when the tool is handheld.