Re: Neon tester vs dodgy wiring
RCCB? They should surely have been replaced by RCDs in the previous millennium??
30mA RCDs are the basic game-play this century.
What is the earthing-scheme? Round here everything [with power supplied by two-wire overhead lines] is TT. You may find older "PME" schemes which are deeply frightening if you're supplied with overhead lines where loss-of-neutral could be an issue [neutral / earth can rise towards line if the neutral-circuit is opened]
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