8 - Channel Relay connections
You only need to connect 1 side of the power feed.







simulate this circuit &ndash; Schematic created using CircuitLab

The C O and P on the terminals stand for normally Closed, normally Open  and presumable Pole. Where Pole is the common (on the left of the schematic). Normally Open is not connected to Pole when the relay's coil is not energized (upper right contact in the schematic connected to VE+) and normally closed is connected when the relay's coil is not energized (bottom right contact in the schematic).

You can double check that with a continuity tester (or a few bits of wire a lamp and a battery that can power it).