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DB

my mains supply is old at this place mid 60's,

the earth goes into the armored cable feeding the house, it disappears through the concrete raft the house is built on and under the front lawn to the electrical main under the sidewalk which is about 25 years old,


as far as I know it terminates at a ground in the local sub station about 275 yards from me,

all metal things like taps, radiators, outlet sockets & gas pipes are grounded to that cable,


im not sure but i think we have 3 different systems here depending on how old it is.