Fire detection and fire alarm devices for dwellings - Specification for smoke alarm kits for deaf and hard of hearing people Ingestion-build-96603 IEC 60398:1999

IEC 60398:1999

voice grade signalling links

This document does not describe the equipment for the measurement

Cold rolled uncoated non-alloy mild steel narrow strip for cold forming (EN 10139)

This document specifies a method for determining the average molecular weight and the molecular weight distribution of polymers by size-exclusion chromatography (SEC) using an organic eluent at temperatures between 60 °C and 220 °C

Fire detection and fire alarm devices for dwellings - Specification for smoke alarm kits for deaf and hard of hearing people Ingestion-build-96603 IEC 60398:1999Smoke alarms for use in dwellings have been available for many years, and are specified in BS 5446 1. These devices are intended to warn of the presence of a potential fire condition by emitting a loud piercing sound. However, people with hearing loss can be unaware of such an alarm sound. There are recognized methods of alerting deaf and hard of hearing people, including the use of vibro tactile and visual alarm devices. To provide a fire warning for