3.2.4.9.Electrical Supervision

(1) Electrical supervision shall be provided for a fire alarm system. (2) If a fire alarm system in a building is required to have an annunciator by Sentence 3.2.4.8.(1), except for hose valves, all valves controlling water supplies in a standpipe system, shall be equipped with an electrically supervised switch for transmitting a trouble signal to the annunciator in the event of movement of the valve handle. (3) An automatic sprinkler system shall be electrically supervised to indicate a supervisory signal on the building fire alarm system annunciator for each of the following: (a) movement of a valve handle that controls the supply of water to sprinklers, (b) loss of excess water pressure required to prevent false alarms in a wet pipe system, (c) loss of air pressure in a dry pipe system, (d) loss of air pressure in a pressure tank, (e) a significant change in water level in any water storage container used for firefighting purposes, (f) loss of power to any automatically starting fire pump, and (See Note A-3.2.4.9.(3)(f)) (g) a temperature approaching the freezing point in any dry pipe valve enclosure or water storage container used for firefighting purposes. (4) A fire pump shall be electrically supervised as stipulated in NFPA 20, “Standard for the Installation of Stationary Pumps for Fire Protection.” (5) Electrical supervision shall be provided to indicate, on the fire alarm system annunciator, a loss of power to a heat tracing cable that is installed to heat (a) a standpipe riser, (b) a sprinkler line as part of a fire suppression system, or (c) an exit or means of egress to keep it free of ice and snow. (6) Indication of a supervisory signal in accordance with Sentences (3) and (5) shall be transmitted to the fire department in conformance with Sentence 3.2.4.7.(4).