There's a company I work with and there were a couple jobs where the AHJ specified they want global shutdown for the duct detectors. The contractor goes about this by using 1 control relay and tie-in in all the duct detectors into that 1 relay. There is a P.E. I also work with in a completely different state with a different AHJ and he wanted me to show global shutdown on a drawing but he specified a control relay at each duct detector. I'm just wondering how the majority of others go about this. Personally I would go the route of the P.E. who wanted a relay at each detector since this follows chapter 21 of NFPA 72 with the control relay being within 3' of the controlled device. Thoughts?
Thanks,
Thanks,