Rongyi Commodity Inspection Co., Ltd. is a third-party inspection and product inspection company, an enterprise approved and registered by the relevant state departments. Mainly engaged in third-party inspections, inspections, inspection inspections on business trips, and inspection inspections included in the inspection. Guangzhou Huajian Commodity Inspection Co., Ltd. has established long-term cooperative relations with many enterprises based on the principle of "safety, guarantee, and commitment". Sincerely welcome friends from all walks of life to visit, inspect and negotiate business.
Third-party inspections usually occur when the products of the manufacturers need to go abroad, and it is impossible for foreign merchants to inspect the products in person, so they entrust third-party personnel to inspect the products.
1. Standard requirements for instructions
The manual must have warnings or instructions on safety, and use the official language. There should be instructions on how to handle the damage when the power cord is damaged, and whether the appliance can be immersed in water for cleaning. There must be user warnings for installation and maintenance.
2. Basic requirements for preventing electric shock
Standard test means that the standard test pin must not touch the live parts, functionally insulated, or only use paint, enamel, plain paper, textiles or oxide layers to isolate the live parts.
Class II appliances or Class II structure standard test means that basic insulation cannot be touched.
For openings on some appliances, jointless test fingers need to be used to assess their recoverability with a force of 20N.
Class II appliances or Class II structure standard test pins cannot touch live dangerous parts.
3. Stability
Except for fixed appliances and hand-held appliances, other appliances that are expected to be used on surfaces such as countertops or floors should have sufficient stability.
Place the appliance on a flat surface at 10 degrees from the horizontal, and place it in any normal position during normal use, and place the power cord on the flat surface in the most unfavorable state.
The appliance should not tip over.
Appliances with heating elements: 15 degrees;
If the appliance falls over, do a temperature rise test.
4. Mechanical danger
As long as the moving parts on the appliance are compatible with the use and work of the tool, their position or packaging should ensure that they can provide adequate protection during normal use to prevent personal injury.
Protective devices such as protective shells and protective covers shall have sufficient mechanical strength and shall be non-removable and washable parts.
Use a circular stop test finger with a diameter of 50mm and apply a force of 5N.
The test finger cannot touch the moving parts that may cause personal injury.
5. Mechanical strength
The shell strength must be able to withstand the impact test. After the impact, there should be no exposed live parts, insulation damage or reduced creepage distance.
Test requirements: 0.5J, 3 times
Joule (Jiao for short, J abbreviated in English) is the international unit of heat, energy and work. The definition of Joule is the work required to move an object by 1 meter with a force of 1 Newton. 1 Joule = 1 Newton meter = Watt second = 0.24 calories.
6. Insulation withstand voltage test
The product must be tested 100% before leaving the factory. For the product, it is an indicator of quality assurance and electrical safety.
The test method is to add an abnormal voltage higher than the normal working voltage to the product for testing, and this voltage must last for a specified period of time, and finally it is determined that as long as there is no insulation breakdown, the test is considered to be passed.
The test voltage must refer to the relevant safety standards and depends on the working voltage and insulation level. Usually AC voltage is used. If the device type parts are across the insulator to be tested, it is recommended to use DC voltage for the test, but the test voltage must be 1.414 times the AC test voltage.
7. Ground impedance test
The grounding impedance test is to test the grounding point of the product. A constant current (generally voltage between 10 and 40A) power supply is applied to the shell or metal part of the product to test the impedance between two points.
IEC: The general product stipulates that the measurement is 25A, and the impedance should not be greater than 0.1Ω.
8. Input power requirements
9. Requirements for handles and knobs
Must be reliably fixed.
If there is no axial force, use 15N axial force to pull for 1 minute.
If it may be subjected to axial force, use 30N axial force to pull for 1 minute.
During normal use, the user can only touch the metal parts separated from the live parts by double insulation or reinforced insulation.
If the shaft is metallic and may become live in the case of insulation failure, the accessible parts of the handle and knob need to be separated from the shaft with additional insulation.
10. Structural requirements
Ensure the safety distance requirements.
Requirements for the drain hole: the diameter of the round hole is greater than Φ5mm, at least one side of the square hole or polygon is greater than 3mm, and the area is not less than 20mm2. (E.g. electric kettle)
There must be no sharp edges, corners, or edges to prevent human injury.
All parts (such as switches, temperature controllers, etc.) must be fixed in a suitable way to prevent sliding and loosening.
The surface through which the wire passes must be smooth and must not have sharp edges, corners, or edges that damage the insulation.
11. Grounding requirements
There should be anti-loose measures (serrated washer is best).
Screws that provide grounding continuity must be screwed into metal.
The ground wire is longer than the live wire and the neutral wire. If it falls off, the fire line and the neutral line should be disconnected first, and the ground line should be the last.
The yellow and green wire can only be used for the ground wire and should be thick enough.
The impedance between the grounding terminal and the grounded metal parts should be low, not more than 0.1Ω.