UL 2166-2021 pdf free download.Halocarbon Clean Agent Extinguishing System Units.
8Electrically Operated Alarms
8.1 When an electrically operated alarm is used, it shall comply with the Standard for Audible SignalAppliances, UL 464 or CAN/ULC-s525, Standard for Audible Signal Devices for Fire Alarm Systems.
9 Controls and Indicators
9.1An extinguishing system shall be provided with:
a) An automatic and manual means of actuation; orb)A manual means of actuation only.
An automatic extinguisher unit shall incorporate an automatic means of actuation.
9.2 A manual means of operation shall be provided with a seal or other device to minimize the potentialfor accidental discharge.
9.3 An extinguishing system unit shall incorporate a pressure gauge for each agent storage containerfilled with a super pressurized agent and each pneumatic control assembly, showing the pressure withinthe container.See Sections 13A and 14A, respectively.
9.4 When a manual means of actuation is provided (see 9.1) and it utilizes an electrical power source:
a) That electrical power source shall be independent of the power source for the automatic meansof actuation; or
b) When the power source is used for both manual and automatic actuation, it shall have anindependent back-up source, such as a battery.
9.5 A control unit,such as a control panel,push-button station, or similar unit, used as part of anextinguishing system shall comply with the Standard for Control Units for Fire-Protective SignalingSystems, UL 864 or CAN/ULC-S527,Standard for Control Units for Fire Alarm Systems.
9.6 Removal of an electric actuator from either the agent storage container discharge valve it controls orthe selector valve it controls shall result in a visual and audible supervisory signal at the releasing controlpanel.
9.7 Duplicate terminals or leads, or an equivalent arrangement, shall be provided for circuits of productsintended to be connected to initiating-device circuits of a releasing control unit; one for each incoming andone for each outgoing wire. lt is not prohibited that a common terminal be used in lieu of duplicateterminals when it is intended to prevent the looping of an unbroken wire around or under a terminal screwin a manner that permits the looped wire to remain unbroken during installation, thereby precludingsupervision in the event the wire becomes dislodged from under the terminal. A notched clamping plateunder a single securing screw, where separate conductors are intended to be inserted in each notch, is anequivalent arrangement.UL 2166 pdf download.