UL 985-2015 pdf download – Household Fire Warning System Units.
2 General 2.1 Components 2.1 .1 Except as indicated in 2.1 .2, a component of a product covered by this standard shall comply with the requirements for that component. See Appendix A for a list of standards covering components used in the products covered by this standard. 2.1 .2 A component is not required to comply with a specific requirement that: a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or b) Is superseded by a requirement in this standard. 2.1 .3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.1 .4 Specific components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specified limits, and shall be used only under those specific conditions. 2.2 Units of measurement 2.2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 2.3 Undated references 2.3.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 3 Glossary 3.1 For the purpose of this standard the following definitions apply. 3.2 ALARM SIGNAL – An audible signal indicating an emergency fire condition requiring immediate action, as an alarm initiated from a manual box, smoke, or heat detector. 3.3 ALARM VERIFICATION – Operation of a control unit in conjunction with a related smoke monitoring head or an initiating device circuit in which an alarm signal from a smoke detector is confirmed one or more times over a predetermined period before the control unit will indicate an alarm. This predetermined period consists of an alarm retard-reset period and an alarm confirmation period.
3.6 CONTROL UNIT ACCESSORY – A device or appliance externally connected to a control unit which is used to ensure the intended operation of a system or to provide supplementary signaling and/or annunciation. Examples of control unit accessories are annunciators, end-of-line resistors or diodes, auxiliary relays, and remote switches. 3.7 DISTINCTIVE SIGNALS – Signals obtained from different sounding appliances, such as bells, horns, sirens, and buzzers, or from a single appliance, such as an electronic horn, where a continuous signal is obtained under one condition and a pulsing signal under another. 3.8 END-OF-LINE RESISTOR – A resistor installed at the end of an initiating or indicating device circuit to limit the amount of supervisory current. 3.9 FAULT – An open or ground condition on any line extending from a control unit. 3.1 0 INDICATING DEVICE – Any audible signal used to indicate a fire, supervisory, or trouble condition. Examples of audible signal appliances are bells, horns, sirens, electronic horns, buzzers, and chimes. 3.1 1 INDICATING DEVICE CIRCUIT – Circuit to which indicating devices are connected. 3.1 2 INITIATING DEVICE – A manually- or automatically-operated device whose operation results in a fire alarm indication from the control unit. Examples of alarm signal initiating devices are thermostats, manual boxes, and smoke detectors.