OP
Engineer54
hmmm. came across a job the other week. TN-S with an earth rod as well. think i got a reading of around 0.25ohms.
Council house installations in the early 50's were quite often also given a earth rod or lattice, i know that my parents house was, as well as all the other houses on that estate and an even bigger near-by council house estate. Nothing wrong in doing the same now either, to any TN-S or TNC-S derived systems....