Rcd tripping | Page 3 | on ElectriciansForums

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Kev2632

Should the rcd trip everytime if somebody had softly touched the live core of a cable? Or does it depend on wha current is flowing?
 
I can't take it any more. Here goes...

The effect you get from touching a live part depends on the current that passes through your body (and the path it takes through your body), which depends on the voltage present and the total resistance of the "fault" circuit. The resistance varies hugely depending on how dry your skin is, how much of your skin area is in contact with the live part, and how you are connected to earth.

If you stand on dry concrete in your dry boots and touch a 230V line conductor, a small amount of current will pass through your body, boots and concrete, to earth. Not enough to kill you and maybe not enough to trip an RCD, but you'll probably feel a tingle.

If you take your boots off and stand in bare feet on wet concrete, or even better in a muddy puddle, the current through your body will be greater. Certainly enough to make you jump. Maybe enough to trip an RCD. Maybe enough to kill you (if the RCD wasn't there).
 

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