Regarding the wiring of a relay, it seems to me it is customary to wire the hot side (L1, +) of power to the COM terminal, and not NO/NC terminals (which would be the outputs). Is there a reason for this? Is there any reference? Or does it just support logical sequential flow when reading a schematic wiring diagram?
Electrical – proper wiring of a relay,
relaywiring
Related Solutions
The second picture shows the outlets wired in parallel, not series.
A relay is basically a electrically-controlled switch. To turn off a normal outlet, all you have to do is interrupt the hot line, which black in your picture. Disconnect the existing black wires and have a single black wire going to each socket. Each of these black wires goes to one contact of the relay, and the master black connection to the opposite contacts of the relays.
If you really using the relay you linked to: that is a bistable relay, which means that current through the coil in one direction switches it to one position, and you need current through the coil in the other direction to get it in the other position.
The behavior that you seem to expect is that of a normal, monostable relay.
Best Answer
There are two schools of thought on this...
Option 1: Line to common..
simulate this circuit – Schematic created using CircuitLab
This is the classic way to connect it, and gives you the option to pick off the normally closed connection later if you need to.
Option 2: Line to normally open..
simulate this circuit
This method stops you from later connecting in the normally closed line, however it also means you do not have unconnected live terminals in the relay which may provide a safety benefit.
For most relays, electrically, and mechanically, it does not make much any difference. If your relay has special features, it may list a preferred connection method in the specification data sheet.
Failing any manufacturer instructions, which method you chose is really arbitrary.
ADD: If you are using multiple relays within the same system, or even multiple products, it is however prudent to follow the same wiring on them all. Set a company standard as it were.
Do not have some connected live on common and others live on normally open.
If your do you will just confuse, and potentially harm, whomever is working on it, and probably even yourself.