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-Isolate all parts of
the complex your
working on
-Disconnect cuircuits and
fuses

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-Tape of the cuircuit
breaker
-Take the fuses
away with you

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-Test zero-potential
with a 2-pole
voltage tester

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-always ground first then  short-circuit
-this step falls away by
systems under 1000V

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-Voltage < 1kV:
cover the parts under
voltage with towels,
clothes or hoses
-Voltage > 1kV:
extra warning signs
alongside ropes and
other warning symbols

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Wear Protection !!!
For example saftey helmets with a face protection, thight fitting clothes, gloves and ESD-protection.

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And if you don´t follow these rules, the following video shows you what could happen.