Bosch High-frequency production tools professional blue Page 53
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Example 1 Example 3 Transfer of 4 kW, 72 V three-phase current, cos φ = 0.8 Same as Example 1, but 200 Hz three-phase current Cable length (straight): 10 m; Ascertained cable cross- at 100 m cable length. section as per Fig. 8: 2.75 mm2; Ascertained cable Ascertained cable cross-section from Fig. 8 is 27 mm2. cross-section as per Fig. 9: 4.8 mm2 (selected cross- This value must be checked according to Fig. 10. In section 6 mm2). this case, the larger cross-section of 50 mm2 must be The cable cross-section of 2.75 mm2 ascertained using selected. Fig. 8 and 9 is not sufficient; it would lead to excessive heating of the cable. There is no need to check according to Fig. 10 because the cross-section is less STRAIGHT GRINDERS Guide | High-frequency technology | 53 than 10 mm2. Example 2 Transfer of 3 kW, 220 V single-phase alternating ANGLE GRINDERS current cos φ = 0.9 Cable length (straight): 100 m; Ascertained cable cross-section as per Fig. 8: 4 mm2; Ascertained cable cross-section as per Fig. 9: 0.9 mm2. According to Fig. 8, a cross-section of 4 mm2 is required. This is authoritative because the result for the cable according to Fig. 9 is only 0.9 mm2 and there is Fig. 10 If you have any questions about high-frequency technology or about using Bosch high-frequency tools, the Bosch customer advisers with all of their know-how will be happy to help you. HIGH-FREquENCy TECHNOLOGy ACCESSORIES therefore no major risk of heating.
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