UL 464-2016 pdf download – Audible Signaling Devices for Fire Alarm and Signaling Systems, Including Accessories.
3.3 DUTY CYCLE – The ratio of the sum of all pulse durations to the total period, during a specified period of operation. 3.4 DWELLING UNIT 1 – A suite operated as a housekeeping unit, used or intended to be used as a domicile by one or more persons and usually containing cooking, eating, living, sleeping and sanitary facilities. 1 Definition of this term is consistent with that used in the National Building Code of Canada 3.5 EMERGENCY WARNING – A system used to provide information and instructions to people in a building, area, site, or other space using intelligible voice communications methods. A Emergency warning System is used to notify occupants that an emergency exists. 3.6 FREE FIELD – An environment in which a sound wave may propagate in all directions without obstructions or reflections within the frequency range of interest. 3.7 PUBLIC MODE – Mode of operation intended to notify occupants or inhabitants in the area protected by the fire-alarm and signaling system. 3.8 PRIVATE MODE – Mode of operation intended to notify only those persons directly concerned with the implementation and direction of emergency action initiation and procedure in the area protected by the fire-alarm and signaling system.
3.1 4 SOUND PRESSURE – A fluctuating pressure superimposed on the static pressure by the presence of sound. The unqualified term means the root-mean-square sound pressure. In air, the static pressure is barometric pressure. 3.1 5 SOUND PRESSURE LEVEL (SPL) – Ten times the common logarithm of the ratio of the square of the sound pressure under consideration to the square of the standard reference pressure of 20 µPa. The quantity obtained is expressed in decibels. 3.1 6 SPECIAL TOOL – A device not normally carried by the public (e.g. a key), normally provided by the manufacturer, to deter unauthorized access to the equipment. Note: This is intended to deter unauthorized access to the equipment, while being available on site either at a defined location or from a ″responsible person″ familiar with and having knowledge of the equipment. 4 Instructions and Drawings Note: In Canada, there are two official languages, French and English. Attention is drawn to the fact that some Canadian authorities may require instructions to be in both official languages. 4.1 Audible signaling devices packaged individually shall include installation instructions and drawings as specified in 4.2 through 4.5 with each unit. Where devices are packaged in bulk (multiple devices in one single package) and not intended for individual resale, a minimum of one set of installation instructions and drawings shall be provided.