Perhaps the most fundamental question of the day, but here goes.
Assuming that I wish to switch (ON/OFF) 3 AC loads, using EM-relay, can a SPST EM-relay (or appropriate rating) be used where only the "live" AC-wire undergoes make/break under microcontroller control, but "neutral" isn't switched ? Or, is it that for AC, we must use a DPST EM-replay only and both "live" and "neutral" must be switched ?
Here is a highly simplified schematic of what I am trying to achieve using the SPST EM-relays. There is a single AC source (230VAC, 50Hz - India), and the 3 AC loads are actually a bunch of 'Christmas Rice-lights', i.e. each AC-load is actually 4-5 rice-light set. Idea is to switch them under microcontroller logic. Nothing novel, perhaps done a zillion times, but first time that I am trying!