I haven’t had a chance to do any tests yet apart from very quickly testing the rcd, with the customer away im not going asap I’m going to get there this week at some point, what’s concerning me is why the rcd never tripped? As even if there was a loose earth connection, or no earth atall surely the rcd should still of picked up an imbalance between live and neutral and tripped regardless when the customer touched the switches?
I had similar ages ago, customer getting intermittent tingles from metal dimmer switch, no voltage between plate & known earth mind.
I left her to fry, whilst consulting members here (nahh not really, swapped switch to plastic). Went back to investigate with new advice and found there was no continuity between installed switch cpc & earth terminal in CU.
I left her to fry, whilst consulting members here (nahh not really, swapped switch to plastic). Went back to investigate with new advice and found there was no continuity between installed switch cpc & earth terminal in CU.
Just shows why you shouldn't have an over reliance on RCD's. Guess the flow through her etc to Earth, was enough to give a tingle, insufficient for imbalance. Dunno, forum boffins will say.
Years of abuse sadly it’s beyond repair
Won't ask on a family forum what you've been doing with it.
I'd suspect that the earth connection somewhere is missing (as mentioned probably on the lighting circuit) and you have a low Insulation resistance between L&E. If so, your need to check the whole circuit thoroughly as you have no idea where the fault is. The CPC could be broken to the first light in the circuit and other metal light fittings and accessiores may potentially be live too !
As RCDs only work on earth imbalance maybe the touch current was below 30mA it may have been different if the customer was bare foot on a damp floor either way this is a potential killer.
I' be carryng out continuity and IR tests the breaking down circuits, at a guess you find a snapped CPC and a squashed Live somewhere on one of those two circuits.
As RCDs only work on earth imbalance maybe the touch current was below 30mA it may have been different if the customer was bare foot on a damp floor either way this is a potential killer.
I' be carryng out continuity and IR tests the breaking down circuits, at a guess you find a snapped CPC and a squashed Live somewhere on one of those two circuits.
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Capacitive coupling or inductance between the earth and other cables can be enough to measure 100v and feel a tingle. But if you measured the current discharged it would be tiny. Switch mode PSUs tend to have a bit of earth leakage which will often appear as half mains voltage if they aren't properly earthed.
So first port of call should probably be earth loop impedance test at switch/earth continuity test.
So first port of call should probably be earth loop impedance test at switch/earth continuity test.
I know, I know I can't help it I need help , is there a TTA anywhere in the Northampton area?
Aren't one of those analogue meters cheaper, but guess it doubles as voltage detector for safe isolation.
That said, his client reckons their getting a shock.
I’m starting to get a bad name on here!
Starting to???
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