Domestic PIR & maximum permitted Zs on a TT system

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Just came upon this thread and I don't understand this comment. Can anyone explain.---------- Post Auto-Merged at 22:53 ---------- Previous post was made at 22:48 ----------

Am I missing something? If an RCD doesn't provide earth fault protection... what DOES it do?
what part of it?

think what an RCD is for, is it classed as an earth fault protective device?

 
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