More likely the occupants won’t know what is causing the RCD to trip so will still panic or whatever.How about emergency isolation.......
Faulty appliance, no access to plug and socket without moving the appliance. RCD cannot be reset, house in darkness.
You may not think that rates as a emergency but for the peoplw affest it is very close to being an emergency.
No need to "think it up" it happened a few weeks ago. The plug had to be levered out of the socket.Have you really managed to think up some very contrived way in which such a fault could result in "the plug overheated and welded it self into the carbonised socket"
Yes, it was off to the side from the machine. When I fitted a new kitchen in my house I fitted isolators off to the side of my big appliances after having experienced their value. I didn't bother with FCUs as that seemed uneccesary as I was leaving plugs on the machines.I presume that isolator was 'sensibly' positioned and not (as is only too common) on the wall immediately above the DW, such that it could not be safely operated when the appliance was "on fire".
As I've said, that's sensible.Yes, it was off to the side from the machine. When I fitted a new kitchen in my house I fitted isolators off to the side of my big appliances after having experienced their value.
Again, we are agreed that they are unnecessary - but, since there are (to all intents and purposes) any significant downsides, I have no problem with people using them in such situations - any more than I have a problem with the fact that we use 13A fused plugs to plug into a (fused) triple socket or into an extension led fed from a (fused) 13A plug.I didn't bother with FCUs as that seemed uneccesary as I was leaving plugs on the machines.
I must say that I still really don't understand how an N-E fault could possibly result in that and, in any event, why the RCD (which would have operated in milliseconds) did not prevent the degree of thermal damage to which you refer,No need to "think it up" it happened a few weeks ago. The plug had to be levered out of the socket. Fortunately getting the charred plug out of the socket removed the path to Earth and the RCD could be reset.
The fuse in the moulded on plug was the source of heat, Load was a 2.3kW heater, ( verified by measuring the resistance of the element ).If so, although that's not an impossible scenario, I would think it incredibly rare. Plugs overheating to the extent of being irremovable from the socket are rare enough - so for that to progress to creating a N-E fault must be incredibly rare!
Fair enough - so exactly as I suggested ...The fuse in the moulded on plug was the source of heat, Load was a 2.3kW heater, ( verified by measuring the resistance of the element ).
... in which case, as I implied, I think that you rather confused things by responding as you did to my ....... Are you sure you've "got things the right away around" and that you're not talking about a situation in which overheating of a plug (due to poor connects/contacts etc.) over a long period of time, with currents not high enough to operate an OPD) eventually caused so much thermal damage as to create a N-E fault, which then immediately tripped the RCD, which then couldn't be reset because the N-E fault persisted? In other words, the N-E fault was the result of the situation, not its cause.
.... with ...
... which left me wondering (and asking) how on an earth an N-E fault could result in "the plug overheated and welded it self into the carbonised socket". However, you now admit that the primary fault was not an N-E one but a (I would think extremely unusual) complication/result of a primary fault which was over-heating of a plug due to other reasons - so I now understand what you have been trying totalk about!Not effective if the fault is a Neutral to Earth fault.
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