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Non compliance of ZS values

MrJack96
Can someone let me know the science behind this please. I’ve been told that if there is a fault on a circuit the ZS values in the regs are there to give ADS in a time that is not going to cause considerable harm. My question is if disconnecting times don’t comply what is the dangers that arise I know it’s physics but have seen marshalling bars carrying current through earthing conductors all day and we don’t get a shock of them. Thank you for you help in advance guys just want to clear up some unanswered questions.
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    aligarjon:

    Where as if you are on a wooden floor there is no earth path and you might not know it was faulty.


    You can get a belt up wooden stepladders on a wooden floor. Trust me! ?


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    aligarjon:

    Where as if you are on a wooden floor there is no earth path and you might not know it was faulty.


    You can get a belt up wooden stepladders on a wooden floor. Trust me! ?


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