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hi, TT system rod value 85 ohms, periodic test form has box for max Zs permitted by BS 7671, has box for R1 + R2, and has box for max measured Zs so far so good. however with all bonds connected Ze at board is 20 ohms max Zs for 6A b type breaker (used to be 8ohm now 7.67ohm). So reading on...