This standard specifies the test equipment, test preparation, test steps and test results for the extruded jacket abrasion test. This standard applies to the abrasion resistance of plastic jackets with an outer diameter of 30 mm and above. GB/T 2951.28-1994 Test methods for mechanical and physical properties of wires and cables Extruded jacket abrasion test GB/T2951.28-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Test method for determining mechanical and physical propertiesof electric cables and wiresTest for abrasion of extruded oversheathsSubject content and scope of application
GB/T 2951.28-94
Replaces G2951.2882
This standard specifies the test equipment, sample preparation, test steps and test results for the extruded oversheath abrasion test. This standard is applicable to testing the abrasion resistance of plastic oversheaths of cables with an outer diameter of 30mm or more. The general provisions, definitions and regular calibration of test equipment for the mechanical and physical properties of electric cables and wires are specified in GB/T2951.28-94. Reference standards
(H/T2951.1--94 General test methods for mechanical and physical properties of wires and cables GB/T2951.23-94 Test methods for mechanical and physical properties of wires and cables Bending test 3 Test equipment
The scraping test device is shown in Figure 1. The radius of curvature of the angle iron scraper should be no less than 1mm and no more than mm, and the scraper head travel should be no less than f600mm. The scraping speed is 15-30cm/s. Figure 1 Scraping test device
1 Force (see Table 1); 2 Angle iron: 3-- Curved surface State Technical Supervision Bureau 1994-07-07 Approved 1995-01 01 Implementation
4 Sample preparation
Take a sample of appropriate length from the cable.
5 Test steps
GB/T2951.28--94
5.1 Bend the sample according to the method and soft number specified in GB/T2951.23. 5.2 Straighten the sample after the bending test and fix it on the table of the scraper with the bending surface in a horizontal state. The angle iron scraper head of the scraper should be in contact with the surface of the sample. Maintain vertical contact. Apply vertical force at the contact point according to Table 1. Table 1
Actual measured outer diameter of cable, mm
Force, N
110 and above
5.3 The scraping test shall be carried out at a temperature of 20±5℃. Each sample shall be scraped 25 times, with one return stroke as one time. 5.4 When there is a requirement for electrical insulation performance of the plastic jacket, the following withstand voltage test shall be carried out after scraping: Put the electrical The scraped part of the cable sample is immersed in an aqueous solution containing 0.5% by weight of sodium nitride and about 0.1% by weight of non-ionized surfactant at room temperature. After at least 24 hours, a 20kV DC voltage is applied between the metal sheath and the salt solution with the metal sheath as the negative electrode. The test time is 1 minute. 5.5 The plastic sheath with the scraped surface cut off is inspected with the naked eye. 6 Test results
The conditions for passing the test are
6.1 No breakdown in the voltage test (when there is a requirement for electrical insulation performance). 6.2 There are no obvious visible cracks or cracks on the inner and outer surfaces of the plastic sheath. Additional remarks:
This standard was proposed by the Ministry of Machinery Industry of the People's Republic of China. This standard is under the jurisdiction of the Shanghai Cable Research Institute of the Ministry of Machinery Industry. This standard was initiated by the Shanghai Electric Relay Research Institute of the Ministry of Machinery Industry. The main initiator of this standard is Xu Yinglin. bzxZ.net
This standard was first issued in 1982 and revised for the first time in July 1994.
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