Other Alarm Types, False Alarm Control

OTHER ALARM TYPES

For the first time, BS 5839: Pt.6 now covers CO fire alarms and multi-sensor alarms.

Heat alarms are given far more importance, as you will have noted from the New Build changes above, for example. Heat Alarms should always comply with BS 5446: Pt.2.

FALSE ALARM CONTROL

A detailed commentary is given on false alarm control, which should be studied as this is probably the major reason that smoke alarms are disabled by the user. Among its recommendations are:

•Not using ionisation type alarms in escape routes

•The use of heat alarms where nuisance alarms could be a problem – only in areas other than escape routes

•A high level of maintenance to reduce the incidence of false alarms

•No automatic connection to the Fire Brigade, because of the high level of false alarms generated in the home

ALARMS FOR THE DEAF AND HARD OF HEARING

BS 5839: Pt.6 now has specific recommendations to make on the use of specialist alarms for the deaf or hearing impaired. Strobes and vibrating pads are discussed, as are signalling requirements in daytime rooms. Specific reference is made to the BS 5446: Pt.3 standard.

SYSTEM VARIATIONS

Where a modification to a system is made, the standard now refers to it as a ‘Variation’ rather than a ‘Deviation’, as the latter term implied that the system was in some way inferior. Note that, in cases where a variation from the recommendations is proposed, the system certificate has to be signed and agreed by all parties.

RF INTERCONNECTION – WIRELESS SYSTEMS

Although the previous version of the document didn’t preclude the use of RF as a form of interconnecting smoke

alarms, it called for a single final circuit. This potential confusion has been resolved.

Now, because of the introduction of new ‘wireless’ or ‘radio’ interconnect systems, Clause 15.5 paragraph b says: “If smoke alarms and heat alarms are of a type that can be interconnected by wiring, all smoke and heat alarms should be connected on a single final circuit”. This is clearly intended for hard wired systems, as a note added to this recommendation states: ‘This recommendation does not apply if the form of interconnection is not capable of conducting current, e.g. if the means of interconnection comprises radio communication rather than wiring.’

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