When controlling magnetic door hold opens I've often used a relay built into the FACP to break a 120V feed to the magnets to have a single relay operate multiple doors, or using a few addressable relays at convenient locations to break the feed to multiple doors.
Does this violate NFPA 72 21.2.4? Should I have an individual relay within 3' of each device?
This ties into my previous thread in that, if this is OK for Door Holders, wouldn't this also be OK for my project where I have 3 elevator shaft dampers in a classified space that are powered closed. Can't I just break the feed at a convenient location outside of the classified space? Or do I need a relay within 3' of each damper? Made it a separate thread as I though if it applies to door holders, it will have a more general interest to the forum.
Does this violate NFPA 72 21.2.4? Should I have an individual relay within 3' of each device?
This ties into my previous thread in that, if this is OK for Door Holders, wouldn't this also be OK for my project where I have 3 elevator shaft dampers in a classified space that are powered closed. Can't I just break the feed at a convenient location outside of the classified space? Or do I need a relay within 3' of each damper? Made it a separate thread as I though if it applies to door holders, it will have a more general interest to the forum.