These requirements apply to speakers, rated at 300 V or less, for fire-protective signalling service and intended for indoor and/or outdoor installation in accordance with CSA C22.1 Canadian Electrical Code, Part I, Safety Standard for Electrical Installations; and CAN/ULC S524, Installation of Fire Alarm Systems. Refer to CAN/ULC-S525, Audible Signal Devices for Fire Alarm Systems, Including Accessories, for requirements pertaining to audible signal devices.This Standard also covers protective covers and other accessories used with speakers for fire alarm systems.