I typically cross-zone detection on a single interlock system - typically using smokes on both circuits. I figured it gave a bit of a fail-safe. And sometimes this was just to alleviate fears of a client who was asking about the use of a double interlock system.
-----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Steve Leyton Sent: 2015/11/13 12:37 PM To: [email protected] Subject: Cross zoned preaction detection Does anyone have any strongly held opinions about cross-zoning of detectors for single-interlock preaction systems? I haven't done one, and have usually fallen back on double-interlock when there is a heightened concern about accidental activation (earthquakes and all that). My understanding is that when two different types of detectors are cross-zoned, it can help to detect a wider range of fires that may grow out of the incipient stages at different speed and/or with different release characteristics. And cross-zoning with the same type of detector can give a heightened level of fail safety, so that seems more comparable to double-interlock. I'm interested in hearing any suggestions, opinions of the value of this design (or not) and good or best practices. Steve Leyton _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
