goldstar
Senior Member
- Location
- New Jersey
- Occupation
- Electrical Contractor
I think I was just PO’d that I didn’t find the Firex relay at the outset :happyyes:
I think I was just PO’d that I didn’t find the Firex relay at the outset :happyyes:
Is there a limit to the number of interconnected units without using multiple zones and relay(s) to join them?
With some circuit designs unalarmed units might be leaking enough signal onto the interconnecting wire to cause a false trip when all are added together.
Does anyone know the voltage on the interconnect conductor, and whether they're all the same?
For your usual 120VAC interconnected devices with battery backup, a maximum of 18 alarm devices, 12 of which may be smokes, is allowed, unless they are supervised then it's 64 and 42. No multiple zones with relay interconnects; they are all one big happy family. If you have a panel with connected low voltage smoke detectors, that's a whole different ball game.
I know that to be true by today’s codes and standards but this installaion was done a long time ago. I’m not sure if it was ever acceptable to interface them with an alarm system. The woman’s husand obviously knew what he was doing at the time.Just so you know, that sort of lash-up isn't code compliant. The wiring to that relay is unsupervised so if it came loose, you'd never get a signal to the fire alarm control unit and you wouldn't even know something is wrong. Actually, none of the smoke alarms are either, so double-plus ungood.
I know that to be true by today’s codes and standards but this installaion was done a long time ago. I’m not sure if it was ever acceptable to interface them with an alarm system. The woman’s husand obviously knew what he was doing at the time.