Maximum Number of Zones

[HereComesTheRain]

It is probably best to not connect the relay power supply to the breadboard. Use that to power the relay boards only.

OKAY.

So do I use the isolated pins at the corner of the RELAY MODULE?  (GND VCC JD-VCC)

Assuming I use the JD-VCC should I place the jumper on the VCC to keep me out of trouble.
To power would I connect multiple wires from the PWR supply - to GND and PWR supply + to JD_VCC to each of the RELAY MODULES?
Do I need to connect the other GND next to IN1 on each of the RELAY MODULES to the - on the BREAD BOARD?

Is the BREAD BOARD wire heavy enough for powering the RELAY MODULE or should I use a larger gauge?

Thanks again.