Can a SPD be installed in a domestic installation without an earth conductor connecting it to the MET, because it will discharge the surge from the live line conductor to the neutral conductor?
Without the earth connection the surge on the live has to discharge to the neutral through two surge devices in series,
Only if they're wired CT1 - wire them CT2 and there's only one between L and N. It's probably easier though to go for a single two-terminal SPD and just connect it L-N anyway.
does that work?
If you did have two devices in a CT1 arrangement then it would sort of work, but the limiting voltage would be the sum of the two devices - so not ideal.
Without the earth connection the surge on the live has to discharge to the neutral through two surge devices in series,
Only if they're wired CT1 - wire them CT2 and there's only one between L and N. It's probably easier though to go for a single two-terminal SPD and just connect it L-N anyway.
does that work?
If you did have two devices in a CT1 arrangement then it would sort of work, but the limiting voltage would be the sum of the two devices - so not ideal.
