Bosch High-frequency production tools professional blue Page 48
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48 | High-frequency technology | Guide High-frequency technology A guide for the user low the above description, i.e. the “zeroing” protective Electrical safety measure as per VDE 0100 – § 10 N. Electrical safety on high-frequency tools is provided by the protective earth conductor in accordance with The possible protective measures can be subdivided EN 50144 to protection class I. On the star-connected as follows: secondary winding of the converter, the star or zero 1.0 Protective measures without switch-off device point is led out. This zero point is earthed (earth 1.1 Protective insulation (VDE 0100 – § 7 N) resistance RB 2 ohms) and connected to the metallic 1.2 Extra-low voltage 42 V (VDE 0100 – § 8 N) housing of the high-frequency tools via the protective 1.3 Protective isolation (VDE 0100 – § 14 N) earth conductors, so that at an operating voltage of 2.0 Protective measures with switch-off device 265 V the hazard voltage between phase and earth in 2.1 Protective earthing (VDE 0100 – § 9 N) the worst case scenario is only 2.2 Zeroing (VDE 0100 – § 10 N) 265 V In cases 2.1 and 2.2, switch-off is performed by fuses Œ 1.73 = 153 V. or corresponding station protection switches with thermal-magnetic triggering. In contrast, at operating voltages of 135 V or 72 V The greatest possible protection is achieved by addi- it is only tionally using residual current protective switches. 135 V 1.73 = 78 V or 72 V 1.73 = 42 V. Protective insulation as per 1.1 is not introduced on high-frequency tools. The extra-low voltage as per 1.2 The effectiveness of the protective earthing is guar- is only used in special cases if it cannot be bypassed anteed by using correspondingly robust plug connec- due to existing regulations. It is very problematic tions, which are immaculate in their electrical design, when transferring high levels of power due to the high and hard-wearing cables. Careful maintenance is currents with regard to cable cross-section, switch, equally important. The high-frequency tool itself must plug, etc. An exception to this are small screwdrivers. meet the high requirements of industrial manufactur- It is then better to use the “protective isolation as ing in terms of its design. It is standard practice to fol- per 1.3”, in which each tool requires its own isolating Fig. 4
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