Standards - Popularly speaking, when a product or service, or an industry, reaches a level of magnitude in the national economy, or has a definite impact on people's lives and health, the relevant international organizations or national institutions will take the lead in organizing the drafting of standards. There is no standard in the world. There are many people involved, so there are standards. International organizations or relevant institutions of the country take the lead in organizing the drafting standards. Generally, they invite several leading enterprises of the organization in a certain industry to participate in the drafting of the standards only if they have the leading industry, leading technology, excellent quality and good reputation.
In principle, after China's accession to the WTO, domestic and foreign standards are the same, but whether the enterprises in the production process are strictly implemented according to the standards.

National standard

Our national standard codes are GB and GB/T. The number of the national standard is composed of the code number of the national standard, the sequence number of the national standard promulgation and the year (year) of the national standard promulgation. GB code national standard contains mandatory provisions and recommendation provisions, when full text is mandatory, it does not contain recommendation provisions, and GB / T code national standard is full text recommendation. Compulsory provisions are the national standards for guaranteeing human health, personal and property safety and for enforcing compulsory provisions of laws and administrative regulations. Recommended national standards refer to the national standards voluntarily adopted through economic means or market regulation in production, inspection and use. However, once the recommended national standard is accepted and adopted, or the parties agree to incorporate it into the economic contract, it becomes the technical basis that all parties must abide by together, and it is legally binding.
The Standardization Law of the People's Republic of China divides Chinese standards into four levels: national standards, industry standards, local standards (DB) and enterprise standards (Q/).

ISO standard

International standards are examined by the Council of the International Standardization Organization (ISO), which accepts international standards and promulgates them by the Central Secretariat; national standards are formulated by the competent administrative department for standardization under the State Council in China, and industrial standards are formulated by the competent administrative department under the State Council. Where products produced by enterprises do not have national and industrial standards, enterprise standards shall be formulated as organizations. The basis for production shall be reported to the relevant departments for the record.

EU standards

CENELEC and CEN, as well as their joint agency, CEN/CENELEC, are the leading standard-setting bodies in Europe.
CENELEC was founded in Brussels, Belgium, in 1976. It was formed by the merger of two early institutions. Its purpose is to coordinate the standards of Electrotechnics promulgated by the standards bodies of the European countries concerned and to eliminate technical barriers to trade. CENELEC is a member of the national committees of 12 members of the European Community and 7 members of the European Free Trade Area (EFTA). With the exception of Iceland and Luxembourg, the remaining 17 countries are members of the International Electrotechnical Commission (IEC).
CEN was founded in Paris, France in 1961. CEN moved to Brussels in 1971 and later worked with CEENELEC. In terms of business scope, CENELEC is in charge of all areas of electrical technology, while CEN is in charge of other areas. Its member countries are the same as CENELEC. With the exception of Luxembourg, 18 other countries are members of the International Organization for Standardization (ISO).

Us ANSI

    The American National Standard Institute (ANSI) is a non-profit non-governmental standardization organization in the United States. It is the focal point of voluntary standards system. It was founded in 1918 and headquartered in New York. More than 250 professional societies, associations, consumer organizations and more than 1,000 companies (including foreign companies) participated. Representatives of federal agencies participated in their activities in their personal names and did not receive government funding.
   ANSI, founded in 1918, is a non-profit non-governmental standardization organization. Department of Commerce, Department of Army, Department of Navy, ASTM, ASME, ASMME, ASCE, AIEE and other organizations have participated in the preparation of ANSI. ANSI has actually become the national standard of the United States. Qualitative Center, the standardization activities of all walks of life in the United States are carried out around it. ANSI makes the government system and the folk system cooperate with each other, and plays a bridge role between the government and the folk standardization system.

IP Protection Level

IP (INGRESS PROTECTION) protection grade system is drafted by IEC (INTERNATIONAL ELECTROTECHNICAL COMMISSION), which classifies electrical appliances according to their characteristics of dust and moisture prevention. IP protection level is composed of two numbers. The first number represents the level of dust-proof and intrusion-proof of electrical appliances (the objects referred to here contain tools, human fingers and so on can not touch the live part of electrical appliances in order to avoid electric shock). The second number represents the sealing degree of moisture-proof and water-proof immersion of electrical appliances. The larger the number, the higher the protection level. [1]
IP Protection Level/INGRESS PROTECTION
Classification of Dust-proof Electrical Appliances to Prevent Invasion of Foreign Objects
The sealing degree of moisture-proof and water-proof electric appliances
The larger the number, the higher the level of protection.

Representation method

The protection level is usually expressed by two numbers followed by IP, which are used to define the protection level.
The first digit indicates the range of dust resistance of the equipment, or the extent to which people are protected from hazards in a sealed environment. Represents the level of preventing solid foreign bodies from entering, the highest level is 6;
The second digit indicates the degree of waterproofing of the equipment. Represents the level of water intake prevention, the highest level is 8.

First digit dust level after IP

Second digit after IP: waterproof grade

IP test

Waterproof test includes the second characteristic number of 1 to 8, that is, the protection level code is IPX1 to IPX8.
Grade waterproofing
1 IPX 1
Method Name: Vertical drip test
Test equipment: drip test device
Sample placement: According to the normal working position of the sample, the sample is placed on a rotating sample table of 1 r/min. The distance from the top of the sample to the drip nozzle is not more than 200 mm.
Test conditions: drip volume is 1.0 + 0.5mm/min
Duration: 10 min
2 IPX 2
Method Name: Inclination 15 degree drip test
Test equipment: drip test device
Sample placement: Make one surface of the sample at an angle of 15 degrees to the vertical line, and the distance from the top of the sample to the dropper is not more than 200 mm. After each experiment, change one side to another, four times.
Test conditions: drip volume is 3.0 + 0.5 mm/min
Duration: 4 x 2.5 min (total 10 min)
3 IPX 3
Method Name: Leaching test
Test methods:
A. Pendulum type sprinkler test
Test Equipment: Swing Tube Sprinkler Test Device
Sample placement: Select the appropriate radius of the pendulum tube, so that the height of the sample table is in the position of the pendulum tube diameter. Place the sample on the sample table, so that the distance from the top to the sample nozzle is not more than 200 mm, and the sample table does not rotate.
Test Conditions: Water flow is calculated by the number of spray holes in the pendulum tube. Each hole is 0.07 L/min. When spraying water, the spray water from the spray holes in 60 degree arcs on both sides of the pendulum tube sprays to the sample. The sample is placed in the center of the semi-circle of the pendulum tube. The pendulum tube oscillates 60 degrees along both sides of the vertical line, totaling 120 degrees. Each oscillation (2 * 120 degrees) is about 4 seconds
Test time: continuous water shower for 10 minutes
B. Sprinkler sprinkler test
Test equipment: hand-held sprinkler test device
Sample placement: the parallel distance between the top of the test and the nozzle of the hand-held nozzle is between 300 mm and 500 mm.
Test Conditions: Balance Belt should be installed during test.