I'm reposting this in an effort to get some feedback on whether identification labels are required at the termination points and at junction boxes where fire alarm cable is being installed.
The requirement of 760.10 seems pretty straight forward: label ALL PLFA circuits where they terminate or are installed in junction boxes. To me, it seems like all means all. All cables are required to have labels in these locations -- not cable identification markings from the manufacturer, but labels that would designate the source and destination of inbound and outbound cables. But one fire alarm contractor is telling me that it's only required where it might cause confusion for other trades such as at a duct detector on a large air handler. He is quoting the line from 760.10, "in a manner that will prevent unintentional interference with the fire alarm circuits during testing and servicing." I agree it needs to be done in a manner that prevents unnecessary interference, but I do not see that all other areas such as all other junction boxes like those behind the fire alarm device, pull stations, annunciators therefore become exempt from the labeling requirement because other trades are not there.
Any comments would be greatly appreciated.