[jeffspower]

Take a few minutes to figure out what a relay really does, & how it works. 85 & 86 go to the pull- in windings. One is ground, the other is powered up to turn on the device (when the device is controlled off 87) or to turn it off (when the device is controlled off 87a). The winding circuit doesn't carry any load. It doesn't matter if 85 is ground and 86 is the "trip wire", or vise- versa. The internal coil it powers up could care less, & works the same either way. Some computer controlled relays are ground controlled, instead of power controlled. 30 is your device power supply (in a power switched circuit thru a fuse or circuit breaker) or device ground supply (in a ground switched circuit) that carries the load, . 30 & 87 is a normally open switch. 30 & 87a is a normally closed switch. I hope you don't find this too confusing. Once you can grasp how it works, it will be easy to understand. Then all you have to know is how each device is controlled, power or ground.