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If the earth is broken somewhere its apparent voltage will free float. If there's also a high resistance fault to live its measured voltage will become that of live. Whereas continuity will only buzz if there's a low resistance between the conductors.
grams-
Makes sense, I think. Are we basically saying the cable is probably fucked somewhere in the run? I’m not sure what the size is but it’s heavy twin & earth and the main conductors only just fit into socket terminals. Chased into the wall behind tiles (which is where a popping noise comes from when the MCB trips).
Dramatic_Hammer
I can’t remember if I posted about the mystery circuit in my utility room before or not. Basically a 32a spur from the CU with a single 13a switchfuse and socket on the end that kept tripping the MCB after a random amount of time (30 secs, 10 minutes, etc).
Changed the corroded socket, still trips.
Changed the breaker (to 16a), still trips.
Changed the switchfuse, still trips.
Noticed a spark when putting it all back together - wtf 240v on the earth (measured between the earth core and an earthed water pipe).
No continuity between line and earth when the breaker is off.
What is going on?!