UL 789

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These requirements cover indicator posts, including wall and underground 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.

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:

— 1.NFPA 11 Low Expansion Foam and Combined Agent Systems

— 2.NFPA 13 Installation of Sprinkler Systems

— 3.NFPA 14 Installation of Standpipe and Hose Systems

— 4.NFPA 24 Installation of Private Fire Service Mains

A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this Standard, and that involves a risk of fire, electric shock, or injury to persons shall be evaluated using the appropriate additional component and end-product requirements to determine that the level of safety as originally anticipated by the intent of this Standard is maintained. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this Standard shall not be judged to comply with this Standard. Where appropriate, revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this Standard.