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Discuss Should the MCB have tripped? in the UK Electrical Forum area at ElectriciansForums.net

TheCodboy

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Hi all, looking for some input from you guys. Had a call out a few days ago where someone has has a shock from brass light switch in a domestic property. When i got there, a decorator told me that he had the switch loose from the wall to strip the wall paper. He's used a steamer, so it points to moisture getting into the switch. The woman who lives there then went to use the switch later and got a shock. Apparently quite painful. The lighting circuit is covered by a 6a mcb on the non-rcd side of the board. When i got there, the switch must have dried out and was functioning fine. I did a ZS at the switch (my megger 1741+ allows a 2 lead test) and i got a reading of 0.69. The CPC was connected to the earth terminal on the switch. So, should the MCB not have tripped?
 
She may well have but her body resistance and the damp will have a high resistance which would have restricted the current flow.
 
MCB would not trip.a RCD may have done, if fitted. bear in mind that a 6A MCB requires approx. 30A fir instantnneous trip. shocking,innit?.
 
She may well have but her body resistance and the damp will have a high resistance which would have restricted the current flow.
I always think back to when i was a young'n and i was getting a tingle of a machine we had in for service. No one believed me as i was the only one, till the gaffer tested it and low and behold.... Fault!
 

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