BS 2740:1969
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Specification for simple smoke alarms and alarm metering devices
Hardcopy , PDF
02-01-2009
English
12-31-1969
Cooperating organizations
Foreword
Specification
1. General
1.1 Scope
1.2 Definitions
2. Simple smoke alarms
2.1 Description
2.2 Light beam length
2.3 Aperture in flue
2.4 Length of cable between photocell receiver and
photocell amplifier
2.5 Calibration
2.6 Checking the alarm setting
2.7 Alarm suppression device
2.8 Alarm relay differential
2.9 Relay contact loading
2.10 Temperatures
2.11 Weatherproofing and cleaning
2.12 Wiring
2.13 Supply voltage variation
2.14 Instrument variation
2.15 External alarm
2.16 Failure of components
2.17 Marking
3. Alarm metering devices
3.1 Alarm counter and clock
3.2 Alarm recorder
Appendices
A. Guidance on the installation of smoke alarms
B. Guidance on setting the alarm point
C. Calibration check
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