A
AmeliePoulain
Hi. This seems like a newbie question but please help.
Received the test results with an 'excessive earth loop impedance' on one final circuit. Circuit originates with a 32A MCB and serves 10 socket points. Wiring is 2x2.5mm live, 2x2.5mm cpc. Max Zs = 0.72 Ohm. r1 (line) = 1.68, rn (neutral) = 1.67, r2 (cpc) = 0.44, R1+R2 = 0.74, maximum measured earth loop fault impedance = 0.89.
Checked wiring and connections - seems ok. Made some silly measurements on one of the sockets: With disconnected MCB measured current of 30mA between Neutral and Earth with 2.09V potential and 16M Ohm resistance. N - L 0A 0.07V, E - L 0A 2.02V.
Should I replace the sockets, rewire the whole lot or what else could it be?
Thanks in advance!
Michael
Received the test results with an 'excessive earth loop impedance' on one final circuit. Circuit originates with a 32A MCB and serves 10 socket points. Wiring is 2x2.5mm live, 2x2.5mm cpc. Max Zs = 0.72 Ohm. r1 (line) = 1.68, rn (neutral) = 1.67, r2 (cpc) = 0.44, R1+R2 = 0.74, maximum measured earth loop fault impedance = 0.89.
Checked wiring and connections - seems ok. Made some silly measurements on one of the sockets: With disconnected MCB measured current of 30mA between Neutral and Earth with 2.09V potential and 16M Ohm resistance. N - L 0A 0.07V, E - L 0A 2.02V.
Should I replace the sockets, rewire the whole lot or what else could it be?
Thanks in advance!
Michael