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Does this earthing look correct?

Eh?? The box shown has got SWA glands. The Earths seem to be connected up, but looks can deceive. Testing is the way forward.

The Wiska product you have mentioned is specifically made for the Wiska 308 box and is not appropriate for this. It wouldn't be needed anyways as the box is made of metal. Wiska needs their special product because their box is made of plastic, which is not a conductor.

So...

Perhaps best if you didn't comment then?
@Taylortwocities, I was replying to his point 3 in post 8 where he wrote: “I installed an additional armoured cable which i connected to a wiska box using a regular nylon gland, so the sheath isn't earthed.”
 
The multimeter has a combined diode measurement and continuity test switch which is what I used.

Use the 200 Ohm range.

I think the the diode range is telling you the forward voltage drop in milivolts, or something.
 

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