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No one is trying to roast you. If you have a Ze of 0.22 and a Zs of 175 in the garage this points to a breakdown of earth continuity, the armour is almost certainly not effectively earthed.
 
No one is trying to roast you. If you have a Ze of 0.22 and a Zs of 175 in the garage this points to a breakdown of earth continuity, the armour is almost certainly not effectively earthed.
Westward, swa armouring is the most obvious place to start looking, but would/could you see similar figures with an issue on the line side of the loop? Loose/poorly made terminations for example?
 
It is possible but this is likely the affect operation of the garage circuits.
 
Westward, swa armouring is the most obvious place to start looking, but would/could you see similar figures with an issue on the line side of the loop? Loose/poorly made terminations for example?

Yes a fault in the line could cause this, but then everything it supplies would have stopped working, or at least not work properly.
And installing an earth rod certainly wouldn't disguise the problem
 

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