Introduction to Electrical Engineering

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Pro: ČEKO IMPORT a.s.
Vydal: České vysoké učení technické Praha Autor: Vladimír Kůla, Michal Kříž

Strana 95 z 112

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5. . Test stations without automatic protection against direct contact Test stations without automatic protection against direct contact shall only installed the erection test station with automatic protection against direct contact not practicable, e. Single fault conditions shall not prevent the test voltages from being switched off when the means protection are opened.g. Test stations with automatic protection against direct contact The protection against direct contact must satisfied insulation live parts, covers or enclosures.. Manual controls shall clearly correlated the respective test circuits. Protective measures against other hazards Appropriate means protection shall provided, cases where addition dangers due to voltages other hazards are expected, e. The occurrence the fault shall ensure that impossible to switch the test voltages again. Opening the means protection must disconnect the test voltage automatically. accordance with 60529 and include all parts the test object.g.3 Preventing automatic energizing Automatic energizing test circuits shall prevented when mains voltage recovers after a power failure. 11.2 Preventing unauthorised and unintentional switching -on Test equipment shall secured against unauthorised and unintentional switching-on test circuits.4 Protection against residual voltages and transfer voltages If there likelihood danger due residual voltages after switching-off test circuits, suitable devices equipment shall provided for safe discharge energy. It shall not possible switch the test voltages until the means protection are fully operational and functioning correctly.4.3.g. 11. 11. Residual voltages shall automatically reduced non-hazardous level before live parts can touched.3. due arcs, noise, explosion, radiation, flying parts, formation gas, fire, dangerous substances.ERECTION AND OPERATION ELECTRICAL TEST EQUIPMENT 96 11. Transfer voltage accessible conductive parts outside the test area shall prevented by adequate measures e. earthing, shielding, appropriate cable routing these conductive parts shall protected against direct contact. 11. Mechanical means protection shall adequately strong. In the case test station with automatic protection against direct contact, barriers and emergency switching off devices may omitted. must not possible bypass the means protection an easy way.3. The means protection against direct contact shall guarantee least the defined degree protection IP3X