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Studio flat recently re-wired.
Ryfields board with main earth coming in and connects to side of ryfields (sealed unit).
Flat’s own head outside has main isolator, from there 25mm tails to inside and then in main switch on DB. With 16mm earth feeding board.
Ze at main switch on DB with main earth disconnected - 0.12 ohms.
Ze At main isolator below head 0.41 ohms with main switch off.
Zs on circuits 0.71 ohms with R1+R2 0.21 ohms.
First question ... how can the ze At the board be greatly lower than at the head isolator with no parallel earths.
Second question... is the ze 0.41, as the Zs of all circuits is going by that result rather than the 0.12?
Help please!
Ryfields board with main earth coming in and connects to side of ryfields (sealed unit).
Flat’s own head outside has main isolator, from there 25mm tails to inside and then in main switch on DB. With 16mm earth feeding board.
Ze at main switch on DB with main earth disconnected - 0.12 ohms.
Ze At main isolator below head 0.41 ohms with main switch off.
Zs on circuits 0.71 ohms with R1+R2 0.21 ohms.
First question ... how can the ze At the board be greatly lower than at the head isolator with no parallel earths.
Second question... is the ze 0.41, as the Zs of all circuits is going by that result rather than the 0.12?
Help please!