What are the test items for safety certification?

Safety certification has the following test items: \r\n\r\n 1, high-voltage test: \r\n\r\n Dielectric Voltage withstand \r\ntest high-voltage test for an international safety certification body required by the mandatory project, the product must be in the factory percentage of the test, which the product, as a guarantee of quality and electrical safety indicators. It is an indicator of quality assurance and electrical safety for the product. The test is conducted by applying an abnormal voltage higher than the normal operating voltage to the product and the voltage must last for a certain period of time, and then it is finally decided that as long as there is no breakdown of insulation, it can be regarded as having passed the test \r\n\\r\n 2, Insulation resistance test \r\n\r\n Insulation resistance \r\ntest Insulation resistance is applied at two points of the relevant DC voltage. DC voltage is applied at two points, up to 1000 volts, usually in ohms, to determine good and defective products \r\n\r\n 3, Ground impedance test \r\n\r\n Ground bond \r\ntest Ground impedance test for the test of the product's grounding point, on the product's outer shell or metal parts, a constant current power supply is applied to test the size of impedance between the two points, the general product specification test 25 amperes. General product regulations test 25 amps, the impedance shall not be greater than 0.1 ohms, while the CSA is required to measure 40 amps test, can detect the grounding screws are not locked, grounding wire diameter is too small, grounding line breaks and other problems \r\n\\r\n 4, leakage current test \r\n\r\n Touch current test refers to the equipment when supplying the current flow through the equipment metal accessible When the current is supplied from the equipment, the current that flows through the metal accessible part of the equipment to the grounded part or accessible part through the human body. \r\n\r\n 5, input test: \r\n\r\n The purpose of the safety input test is to examine the product design to consider whether the input meets the normal operation of the product, the input circuit is able to withstand the current required for the product to work. In the product standard, it is stipulated that the maximum power consumption of the input current cannot be greater than 110% of the nominal value of the product. This nominal value also tells the user the minimum current required for the safe operation of the product, so that the user has to prepare for such an electrical environment before using the device. \r\n\r\n 6, the stability of the safety marking test: \r\n\r\n Warning signs for the user to use the safety, must be stable and reliable, can not be used for a period of time, become fuzzy, and lead to the user error in the use of the product, which leads to danger, or directly lead to the danger occurs. Therefore, it is necessary to test this stability. Inside the safety standard, it is stipulated that the sign must not be blurred when tested with water for 15S and then with gasoline for 15S. \r\n\r\n 7, capacitance discharge test: \r\n\r\n For a power cord can be plugged and unplugged equipment, its power cord is often unplugged out of the socket, unplugged out of the socket of the power plug, is often played with, or placed arbitrarily. This leads to a problem, was pulled out of the power plug is charged, and this electricity with time and disappear, if this time is too long, then it will be playing with the plug of the people caused by electric shock, the arbitrary placement of the power plug will damage other equipment or equipment themselves. Therefore, the safety standard of each machine has made strict provisions for this time. We need to consider this time in designing our products, and we need to measure this time for product safety certification. \r\n\r\n 8, Circuit Stability Test: \r\n\r\n SELV circuit \r\n\r\n SELV circuit, is the safety ground voltage circuit, this circuit is safe for the use of a person is safe, such as cell phone charger DC output to the cell phone, they are safe to touch at will will not be dangerous. \r\n\r\n Note: SELV circuits are interpreted differently in different standards, for example, the interpretation of IEC60364 is different from IEC60950-1, so it is important to be aware of the dangers of SELV under which standard. \r\n\\r\n SELV circuits need to fulfill special requirements to be SELV circuits, and these requirements are such that, in the event of a single fault, the requirements of SELV circuits are still met. Therefore for each SELV circuit needs to be tested under single fault to prove that is SELV circuit is stable. The test is done by introducing single faults one by one to monitor the SELV circuit. \r\n\r\n 9, power-limited source circuits \r\n\r\n Since power-limited source circuits output a small amount of power, in the already known experience, they do not lead to a fire hazard, so in the safety standards, the enclosure of such circuits have been specified to reduce the requirements of the provisions of the flame retardant rating of UL94V-2. Therefore, such circuits are required to be measured, to prove that they are power-limited source circuits. \r\n\r\n 10, current-limited source circuits \r\n\r\n engaged in the electrician knows, AC220V circuit after a certain resistance, there is no danger to people. Then exactly how much resistance, and what kind of resistance requirements. Maybe people don't know. Inside the safety standard there is this provision, this provision is the current-limiting source circuit. Limit current source current, required in the circuit normal and single fault, the outflow of current is below the safety limit, will not cause danger to people less than 0.25mA. For the isolation of the primary and secondary circuits of the resistance is required to meet the special standards of impact resistance. \r\n\r\n 11, grounding continuity test: \r\n\r\n People who have been involved in electrical installations know that some equipment must be grounded, otherwise there will be hazardous voltages on surfaces it can touch. These hazardous voltages must be released by grounding. Safety testing specifies how much current needs to be used, for how long, and the measured resistance must be less than 0.1 ohms, or a voltage drop of less than 2.5V (use this value if you are in a position to do so). \r\n\r\n 12, moisture test :\r\n\r\n Moisture test did not, is to simulate the equipment in the extreme ring tight, the safety performance of the equipment. After the equipment is manufactured, it is safe to operate in any humidity, not because it is the rainy season, high humidity and tell the user that the equipment can not be used. Therefore, when designing the equipment, it must be considered that the equipment meets the safety requirements under predictable humidity, and therefore humidity testing is a must. Test requirements vary slightly depending on the standard. \r\n\r\n 13, torsion test :\r\n\r\n Torsion test is the equipment external wire in use, often subject to external forces bending deformation. This test is to test the number of times the wire can withstand bending, in the product life cycle will not be due to external forces occurring breakage, AC220V wire exposed and other hazards. \r\n\r\n 14, stability test: \r\n\r\n equipment in normal use, there are often different external forces, such as: higher equipment people will be leaning against it, or someone in the maintenance of climbing it; shorter equipment, the shape of the same as a stool-type, someone may stand on it and so on. As the equipment is subject to these external forces, equipment in the design of the equipment is not well thought out will lead to equipment collapse, flip and other hazards. Therefore these tests need to be done after the equipment is designed. Check that they meet the safety requirements. \r\n\r\n 15, shell force test: \r\n\r\n equipment in the process of use, will be subject to a variety of external forces, these external forces may make the equipment shell deformation, these deformations may lead to danger inside the equipment, or indicators can not meet the requirements. Therefore, these effects must be considered when designing the equipment, and these indicators must be tested during safety certification. \r\n\r\n 16, drop test: \r\n\r\n Small devices or desktop equipment, in normal use, may fall from the hands or workbench to the ground. These drops may cause the internal safety indicators of the equipment not to meet the requirements. This effect must therefore be taken into account when designing the equipment and these indicators need to be tested during safety certification. The requirement is that the equipment can be dropped with a loss of functionality, but without posing a danger to the person using it. \r\n\r\n 17, stress relief test: \r\n\r\n equipment if there are dangerous circuits, etc., equipment in normal use, if the shell deformation, resulting in the exposure of the danger, so it is not allowed. This must be taken into account when designing the equipment, and these indicators must be tested during safety certification. \r\n\r\n 18, battery charge/discharge test: \r\n\r\n If the device has a rechargeable battery inside, it is necessary to do the charge/discharge test, and a single-fault charging test and overcharge test. This is because the equipment in normal use, charging and discharging, as well as the equipment has a fault, but the main function has not been lost, the user will not find the equipment failure, in this case, the charge and discharge requirements are safe, and can not be a result of the explosion and other dangers. \r\n\r\n 19, equipment temperature rise test: \r\n\r\n (the temperature of the internal and external surfaces under normal operation) \r\n\r\n safety test, temperature rise test is the most important, although the test using equipment and instruments and artificial climate environment test is the same, but try to examine the project and test devices and purposes are very different. Artificial climate environment mainly examines the adaptability and reliability of the equipment. And safety regulations to examine whether the equipment can work safely. Here is an example to illustrate the difference between them: safety test mainly test the temperature of the safety device, such as insulation materials in the normal operating temperature, this temperature in the highest allowable operating temperature of the equipment, to be less than the maximum allowable temperature of the insulation material. Such as in the 25 ℃ environment test insulation material temperature is 100 ℃, and insulation materials can only be 130 ℃ below the safe operation, which is the definition of the maximum allowable operating temperature of the device is very critical, if the device is 50 ℃ ambient temperature, then the insulation material is converted to 50 ℃ ambient temperature test temperature should be 125 ℃ to meet the requirements of 130 ℃ less than the test passes. If the device is 60 ℃ ambient temperature, then the conversion to 60 ℃ ambient temperature test temperature should be 135 ℃, greater than 130 ℃ requirements, the test does not pass. The same other safety devices also need to test the operating temperature. To determine whether to meet the requirements. \r\n\r\n 20, ball pressure test: \r\n\r\n As a support with dangerous voltage insulation or plastic parts, need to do the ball pressure test to ensure that the dangerous voltage components at high temperatures in the work of the plastic parts have sufficient support strength. The test temperature is the maximum temperature plus 15℃ but not less than 125℃. The ball pressure time is 1H at the required temperature.