IEC 60851-5-2011 pdf free

IEC 60851-5-2011 pdf free.Winding wires – Test methods – Part 5: Electrical properties.
4.4 Enamelled round wire with a nominal conductor diameter over 0,100 mm up to and including 2,500 mm, grade 1 to grade 3
4.4.1 Test at room temperature
A straight piece of wire, approximately 400 mm in length, with the insulation removed at both ends, shall be twisted back on itself for a distance of (125 ± 5) mm on the twisting device as shown in Figure 2. The ends of the wire shall be joined, and the load applied with the number of twists, as given in Table 3. The loop at the end of the twisted section shall be cut at two places to provide a maximum spacing between the cut ends. Any bending to ensure adequate separation between the two wire ends shall avoid sharp bends or damage to the coating.
The test voltage shall be applied according to 4.1 between the conductors of the wires. Five specimens shall be tested. The five single values shall be reported.
4.4.2 Test at elevated temperature
A specimen prepared according to 4.4.1 shall be placed in the oven preheated to the specified test temperature ±3 °C. The test voltage shall be applied according to 4.1 between the conductors of the wires in not less than 15 mm after placing the specimen in the oven. The test shall be completed within 30 mm.
Five specimens shall be tested. The five single values shall be reported.
4.5 Round wire with a nominal conductor diameter over 2,500 mm
4.5.1 Test at room temperature
A straight piece of wire of sufficient length, with the insulation removed at one end, shall be bent around a mandrel as shown in Figure 3.
The diameter of the mandrel shall be 50 mm ± 2 mm.
The specimen shall be placed in the container and shall be surrounded by shot at least 5 mm between the specimen and the inner walls of the container. The ends of the specimen shall be sufficiently long to avoid flashover.
The shot shall be poured gently into a container until the specimen is covered by shot at a depth of 90 mm. The metal shot shall be not more than 2 mm in diameter; balls of stainless steel, nickel or nickel-plated iron have been found suitable. The shot shall be cleaned periodically with a suitable solvent (for example. 1,1,1-trichioroethane).
The test voltage shall be applied according to 4.1, between the conductor and the shot.
NOTE By agreement between the purchaser and the supplier, the test may be carried out with the specimen under oil. Oil should be in accordance with IEC 60296 or as agreed upon between customer and supplier.
Five specimens shall be tested. The five single values shall be reported.
4.5.2 Test at elevated temperature
A specimen prepared according to 4.5.1 shall be placed in the oven preheated to the specified test temperature ±3 °C. The shot and container shall be preheated within the oven at the test temperature and kept there during the loading of the test specimen. The loading operation of the test specimen shall be performed very gently in order to avoid damage to the specimen.
The test voltage shall be applied according to 4.1 between the conductor and the shot in not less than 15 mm after placing the specimen in the oven. The test shall be completed within 30 mm.
The temperature shall be kept within ±3 °C.
Five specimens shall be tested. The five single values shall be reported.
4.6 Fibre wound round wire
4.6.1 Test at room temperature
A straight piece of wire of sufficient length with the insulation removed at one end shall be
bent 10 turns around a mandrel as shown in Figure 4. The diameter of the mandrel shall be
— 25 mm ± 1 mm for nominal diameter up to and including 2,500 mm;
— 50 mm ± 2 mm for nominal diameter over 2,500 mm.
The specimen shall be placed in the container as shown in Figure 4 and shall be surounded by shot at least 5 mm between the specimen and the inner walls of the container. There shall be a minimum distance of 2,5 mm between adjacent turns. The ends of the specimen shall be sufficiently long to avoid flashover.
The shot shall be poured gently into the container until the specimen is covered by shot at a depth of 90 mm. The metal shot shall not be more than 2 mm in diameter: balls of stainless steel, nickel or nickel-plated iron have been found suitable. The shot shalt be cleaned once per year.
The test voltage shall be applied according to 4.1 between the conductor of the wire and the shot.
NOTE By agreement between the purchaser and the supplier, the test may be carried Out with the specimen under oil. Oil should be in accordance with lEG 60296 or as agreed upon between customer and supplier.
Five specimens shall be tested. The five single values shall be reported.IEC 60851-5 pdf free download.