Thanks for the video, it cleared some confusion for me as far as NO and NC. Im guessing fire sprinkler temper switches, pressure valves usually are in a Normally Open position?
I'm glad it helped. While it may not always be 100% true, I would say yes more often than not sprinkler devices are typically wired with Common and Normally open contacts (and you'll usually find an End of line resistor going across COM + NO contacts). Sometimes there is no actual fire panel and all of the wires just go into a security type keypad, usually those types of fire alarm monitoring utilize COM and NC circuits, so creating an open condition in the wire is what gives the supervisory/alarm signal. At the end of the day its wired based on what the Fire alarm panel wants to see. If you're unsure then you honestly have a 50/50 chance of wiring it right; One wire or pair of wires (depending if its class A or class B wiring) will always go to COM and the other wire or pair of wires will either go to NO or NC. Try it one way and see if the panel clears and then test the switch mechanically to make sure it works. If for example you put the wires to NO and you keep getting a supervisory/alarm on the panel, then switch the wire(s) over to NC instead and it should clear.
Agreed. Unfortunately that was just a victim of circumstances for the place I was working at the time. Maybe one day I’ll have time/opportunity to re-make the video in a better environment.
Thanks for the video, it cleared some confusion for me as far as NO and NC. Im guessing fire sprinkler temper switches, pressure valves usually are in a Normally Open position?
I'm glad it helped. While it may not always be 100% true, I would say yes more often than not sprinkler devices are typically wired with Common and Normally open contacts (and you'll usually find an End of line resistor going across COM + NO contacts).
Sometimes there is no actual fire panel and all of the wires just go into a security type keypad, usually those types of fire alarm monitoring utilize COM and NC circuits, so creating an open condition in the wire is what gives the supervisory/alarm signal.
At the end of the day its wired based on what the Fire alarm panel wants to see. If you're unsure then you honestly have a 50/50 chance of wiring it right; One wire or pair of wires (depending if its class A or class B wiring) will always go to COM and the other wire or pair of wires will either go to NO or NC. Try it one way and see if the panel clears and then test the switch mechanically to make sure it works. If for example you put the wires to NO and you keep getting a supervisory/alarm on the panel, then switch the wire(s) over to NC instead and it should clear.
Would have been nice if you didn't have the background beeping going off for over half the video.
Agreed. Unfortunately that was just a victim of circumstances for the place I was working at the time. Maybe one day I’ll have time/opportunity to re-make the video in a better environment.