Just curious , it's a 1930s house - the main cable is inside steel conduit and the earth comes out of the conduit along with the main cable - the steel conduit then has a bonding strap attached to it.
I'm rather confused by that photo. Whilst what is above the clamp is clearly steel conduit, although it may be an optical illusion, what one sees below the clamp looks (to me) more like cable, of smaller diameter than the conduit. Particularly if the latter (and, I suppose, even if it isn't), it begs the question as to where the G/Y disappearing into the conduit goes.Looks like TN-S to me.
The problem in this case would seem to be in knowing 'what to test'. As you recently pointed out, one does not want to be mislead by testing an earth in the presence of a bonded extraneous-c-p (which one can't rely on always being there).As with any supply, the only way to tell if it’s actually any good it to perform an earth fault loop impedence test on it.
I suppose one could disconnect the G/Y which disappears into the conduit from the clamp, and then test both that conductor and the clamp - but I think that there are certain combinations of 'pairs of answers' which could still leave one wondering about what the impedance of 'the actual earth' was!
I'm was a bit confused by this photo initially as I couldn't see how the DB was connected.Cheers, I'm just curious as I may be looking at getting an Electric Vehicle and they need good earths apparently. From what I know the houses in the street are connected serial and this one looks like the end property - There has been no history of issues
Here's a pic of the setup , there is no earth arrangements outside - I'm wondering if that steel conduit was an early earth rod? Maybe the conduit goes back to the source - if so It's probably rotted out by now as it's probably 50+ years old.
Purple stuff is network and that's a UPS at the bottom feeding a cab
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