If memory serves at about the time that reg came into being there were devies about that purported to detect a fire/overheating in electrical accessories and in such an event close contacts between L and PE via a resistor in order to trip the supply RCD. Needless to say there were a number of scenarios which turned a minor failure into variously dangerous situations, often compounded if the user reset the RCD without fixing the original fault.
If memory serves at about the time that reg came into being there were devies about that purported to detect a fire/overheating in electrical accessories and in such an event close contacts between L and PE via a resistor in order to trip the supply RCD. Needless to say there were a number of scenarios which turned a minor failure into variously dangerous situations, often compounded if the user reset the RCD without fixing the original fault.
