scope:

Indicator Posts for Fire-Protection Service

UL 789

1.1 These requirements cover indicator posts, including wall, underground, and above ground types, for use in operating valves of the inside-screw pattern and for indicating the position of the gates in such valves. Indicator posts are primarily intended for use with valves controlling water supplies to sprinkler, deluge, water spray, foam, and standpipe systems used in private fire service where connections enter buildings.

1.2 Requirements for the installation and use of the indicator posts covered by this standard are included in the following Standards of the National Fire Protection Association:

a)     NFPA 11,  Low Expansion Foam and Combined Agent Systems;

b)     NFPA 13,  Installation of Sprinkler Systems;

c)     NFPA 14,  Installation of Standpipe and Hose Systems; and

d)     NFPA 24,  Installation of Private Fire Service Mains.