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.
That depends on the earthing resistance of the supply. If this is low (20 Ohms usually, see BS 7430), then the body resistance should be able to be generally ignored as it's much higher ... at least in dry conditions.
That depends on the earthing resistance of the supply. If this is low (20 Ohms usually, see BS 7430), then the body resistance should be able to be generally ignored as it's much higher ... at least in dry conditions.
