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I only have experience with TN systems and am struggling to see how on a TT system with a higher Ze will meet the circuit breaker Zs values in table 41.3. I’m obviously missing something but don’t know what?    Joey

Sorry I meant 490a PEFC. 463a PSCC

Hi All, This might seem basic but I could use some advice. In a domestic property the earthing arrangement is TT. A new shower circuit needs installing, but have done some testing the Ze is 74 ohms, Zs@db 4.8ohms, Ipf@db 49a   Now obviously on any new circuits to be installed, they...