Wiring harness waterproofing is a necessary element of the wiring harness work. Once the waterproofing of the wiring harness fails, it is easy to cause each electrical system to work abnormally, which affects the comfort of the whole car and even causes great safety risks as well. After the design is completed, a waterproofing test should be conducted in order to check the reliability of the waterproofing design. Here I will briefly introduce the definition and test method of automotive wiring harness waterproof level.
IP (INGRESS PROTECTION) protection level system is drafted by IEC (INTERNATIONAL ELECTROTECHNICAL COMMISSION), which classifies electrical appliances according to their dust and moisture-proof characteristics. IP protection level is composed of two numbers, the first number indicates the level of dust-proof and protection from foreign objects (the foreign objects referred to here include tools, human fingers, etc. cannot touch the electrically charged part of the appliance to avoid electric shock), and the second number indicates the degree of moisture-proof and watertightness of the appliance, the larger the number, the higher the protection level. Protection level is mostly expressed by IP followed by two numbers, and the numbers are used to clarify the level of protection. The first digit indicates the extent to which the equipment is resistant to fine dust, or the degree to which people are protected from hazards in a sealed environment. It represents the level of protection against solid foreign objects, the highest level being 6. The second digit indicates the degree to which the equipment is waterproof. represents the level of protection against water ingress, the highest level being 8. e.g. motor protection level IP65. level of protection against contact electrical equipment and foreign objects (first digit) level of protection against water in electrical equipment (second digit)
IP dustproof level (the first X said) 0 : no protection 1 : to prevent the intrusion of large solids 2 : to prevent the intrusion of medium-sized solids 3 : to prevent the intrusion of small solids into the intrusion 4 : to prevent the entry of objects larger than 1mm solids 5 : to prevent the accumulation of harmful dust 6 : completely prevent the entry of dust because the general requirements of the harness for dustproof or very high, we will default to 6, which is why we often in Suppliers above the report or drawings, will be IP6X to indicate the waterproof level of the harness.
IP waterproof rating range: The waterproof test includes a second feature number from 1 to 8, i.e. the protection class code is IPX1 to IPX8.
No protection No special protection1 Prevents drip intrusion Prevents water from dripping vertically2 Prevents drip intrusion even when tilted 15 degrees Prevents drip intrusion even when electrical equipment is tilted 15 degrees3 Prevents water from spraying Prevents water from spraying in the direction of rain or vertical entry angle less than 50 degrees4 Prevents water from splashing Prevents water from splashing in all directions5 Prevents water from large waves Prevents water from large waves or rapid spraying from water jets Prevent water intrusion from large waves6 Prevent water intrusion from large waves Electrical equipment intrusion into the water under certain conditions of time or water pressure, but still ensure the normal operation of the equipment7 Prevent water intrusion from water intrusion Electrical equipment indefinite submersion in the water under certain conditions of water pressure, but still ensure the normal operation of the equipment8 Prevent the impact of submersion
IP protection class level waterproof (2) IPX 1 method name: vertical drip test equipment: drip test device specimen placement: the normal working position of the specimen placed on a rotating sample table at 1r/min, the distance from the top of the sample to the drip port is not more than 200mm test conditions: drip volume of 1.0 ± 0.5mm/min duration: 10 min (2) IPX 2
Method name: tilt 15 ° drip test equipment: drip test device specimen placement: so that one face of the sample and the vertical line at an angle of 15 °, the distance from the top of the sample to the drip port is not greater than 200 mm. after each test a face, change another face, a total of four times. Test conditions: drip volume of 3.0 ± 0.5 mm/min duration: 4 × 2.5 min (a total of 10 min
(3) IPX 3
Method name: drenching test test method: a. Pendulum tube drenching test equipment: pendulum tube drenching splash test device specimen placement: choose the appropriate radius of the pendulum tube, so that the height of the sample table in the pendulum tube diameter position, the specimen on the sample table, so that the distance from the top to the sample spout is not greater than 200mm, the sample table does not rotate. Test conditions: the water flow rate is calculated according to the number of water jets in the pendulum, each hole is 0.07 L/min, when the water shower, the pendulum midpoint of each side of the 60 ° arc section of the water jets spray water to the sample. The sample is placed in the center of the semicircle of the pendulum. The pendulum swings 60° on each side of the vertical line, for a total of 120°. Each swing (2 × 120 °) about 4 s test time: 10 min continuous drenching b. Nozzle drenching test equipment: hand-held drenching splash test device sample placement: so that the test top to hand-held nozzle nozzle parallel distance between 300mm to 500mm test conditions: the test should be installed with a balance weight baffle, the water flow rate of 10 L/min test time: according to the surface area of the sample being examined sample shell surface area, each square meter for 1 min (excluding the installation area), at least 5 min
(4)IPX 4
Method name: splash test test method: a. Pendulum splash test equipment and sample placement: the same as the above IPX 3 a; test conditions: except for the latter conditions, and the above IPX 3 a are the same; spray area for the pendulum tube at the midpoint of each side of the 90 ° arc section of the spray hole water spray to the sample. The sample is placed in the center of the semicircle of the pendulum. The pendulum swings 180° along each side of the vertical line, a total of about 360°. Each swing (2 × 360 °) about 12 s test time: with the above IPX 3 a paragraph are the same (i.e. 10 min). b. Nozzle splash test test equipment and sample placement: with the above IPX 3 b paragraph are the same; test conditions: remove the equipment installed with the balance of the weight of the baffle, the rest and the above IPX 3 b paragraph are the same; test time: with the above IPX 3 b paragraph are the same The test time: the same as the above IPX 3 b, i.e., 1 min per square meter (excluding the installation area) for the surface area of the sample under test, at least 5 min
(5) IPX 5
Method name: water jet test test equipment: nozzle nozzle diameter of 6.3mm test conditions: so that the test sample to the water jet distance of 2.5m ~ 3m, water flow rate of 12.5 L / min (750 L / h) test time: according to the surface area of the sample shell, each square meter for 1 min (excluding the installation area) at least 3 min
(6) IPX 6
Method name: strong water spray test; test equipment: nozzle nozzle diameter of 12.5 mm test conditions: so that the test sample to the nozzle distance of 2.5m ~ 3m, the water flow rate of 100 L / min (6000 L / h) test time: according to the surface area of the sample shell, each square meter for 1 min (excluding the installation area) at least 3 min
(7) IPX 7
Method name: short time immersion test equipment and test conditions: immersion tank. The size of the specimen should be put into the immersion tank, the sample bottom to the water surface distance of at least 1 m. The top of the specimen to the water surface distance of at least 0.15m test time: 30 min
(8) IPX 8
Method name: continuous diving test; test equipment, test conditions and test time: agreed by the supply and demand (buyer and seller), its severity should be higher than IPX 7. Note: In addition, many electronic products for outdoor use are emphasizing floating ability.
(9)0IPX 9 method name: high-pressure jet test test equipment: nozzle nozzle test equipment: nozzle nozzle internal diameter of 12.5 mm; test conditions: water spray angle: 0 °, 30 °, 60 °, 90 ° (4 positions); the number of spray holes: 4; sample table speed: 5 ± 1 r.p.m; distance of 100 ~ 150mm, each position 30 14 ~ 16 L / min, spray water pressure 8000 ~ 10000kPa, water temperature requirements 80 ± 5 ℃ test time: 30 seconds per position × 4 total 120 seconds.
