An old cliché maybe, but ever so true. Take the example of the electric fence with a voltage of up to 9000 volts it will not kill, neither will it boil a kettle due to the fact that current is limited to non-lethal levels. If 9000 volts will not kill or boil a kettle and a domestic supply of 220 volts will do both, then the threat of electrocution is clearly, not from voltage alone but from the amount of current the voltage is capable of delivering through the worker.

100 volts will deliver 100 mAmps  through the human body which becomes dangerous current flow after 3 seconds.

 

On the basis that voltage alone will not kill, the hazard to be addressed is the available fault current, how it is limited to non-lethal levels and the length of time the human body is exposed to the current.

 

The chart below may be helpful in the selection of properly sized short-circuiting equipment which is fit for purpose and will provide worker protection.

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REMEMBER……. SIZE DOES MATTER
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