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Touch proofness

IEC 60529 / DIN EN 50274 – Electrical installations and systems must also provide a high level of safety for service technicians when carrying out servicing or performing measuring and testing tasks.

Contact safety test with test finger with a diameter of 12.5 mm  

Contact safety test with test finger with a diameter of 12.5 mm

IEC 60529 / DIN EN 50274 – Electrical installations and systems must also provide a high level of safety for service technicians when carrying out servicing or performing measuring and testing tasks.

The accident prevention regulations BGV A 2 issued by the German employer's liability insurance association for precision mechanics and electrical engineering apply to the operators of electrical systems and are aimed at the prevention of electrical accidents by means of special safety requirements. These regulations contain specifications regarding the safety distances for work, operation, and occasional handling in the proximity of “live parts” in low-voltage systems up to 1000 V ~ or 1500 V –. Work with live parts is only permitted once they have been de-energized. Operation in the proximity of live parts is only permitted if these parts are de-energized or are protected against direct contact (§ 6). When working in the proximity of live parts, the following safety measures apply: provision of the de-energized state for the duration of the work or ensure shock protection is in place in the form of covers or barriers during the work or assurance that proximity limits will not be violated (§ 7).

Contact safety test with test ball with a diameter of 50 mm  

Contact safety test with test ball

Work with live parts is only permitted once they have been de-energized. Operation in the proximity of live parts is only permitted if these parts are de-energized or are protected against direct contact (§ 6). When working in the proximity of live parts, the following safety measures apply: provision of the de-energized state for the duration of the work or ensure shock protection is in place in the form of covers or barriers during the work or assurance that proximity limits will not be violated (§ 7). The term “occasional handling” has been introduced for the operation of elements such as pushbuttons, rocker arms or rotary buttons in the proximity of live parts. According to VDE 0105-1, this is covered by “operation with partial protection against direct contact”. Detailed specifications for “occasional handling” can be found in DIN EN 50274. This specifies to what degree live parts in the proximity of operating elements are to be protected against contact. The basis for this is the definition of a “protection area for occasional handling”; this is the area into which the user must reach in order to handle the machine. The most important thing is that an area formed by an even envelope curve 30 mm in radius must surround the live parts. This area must be touch-proof, i.e., the live parts of the electrical device must not be within reach of the VDE test finger according to IEC 60529/DIN VDE 0470-1 (test finger).

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