BS 5839-3:1988

This Part of BS 5839 has been prepared under the direction of the Fire Standards Committee. It is based on proposals submitted by the British Fire Protection Systems Association Ltd.

The start and finish of text introduced or altered by Amendment No. 2 is indicated in the text by tags .

Fire protection equipment such as fire doors, fire shutters and fire dampers are required to be closed in the event of fire, but it may be inconvenient to have them closed at all other times. Accordingly they may be held open and, in the event of fire, released by one of the automatic release mechanisms specified in this standard. A fire alarm system, a fire detection and alarm system or one or more fire detectors may provide the signal for the operation of an automatic release mechanism. A central control may be necessary to ensure that all fire protection equipment can be released in the absence of people in the building.

Although automatic release mechanisms complying with this part of BS 5839 are intended for the release to a closed state of fire doors, etc., which are normally held open, they may also be suitable for the release, to an open state, of fire protection equipment such as covers to openings for smoke control. However, compliance with this part of BS 5839 should not be taken as implying their suitability for such uses.

Most fire doors and other fire protection equipment that can be held by one of the automatic release mechanisms specified herein may be released without a significant safety hazard requiring additional precautions or, in the event of release in the absence of fire, significant cost or inconvenience. Attention is drawn to the BS 7273 series on automatic operation of fire protection.

NOTE Attention is drawn to BS EN 1155 which specifies the requirements and test methods for 24 V d.c. electrically powered hold-open devices for swing doors.

The tests are type tests and are not intended as manufacturers’ tests to maintain uniformity of quality in production, which is dealt with in BS 5750. While the tests are intended to assess the most important features of the design and construction of automatic release mechanisms, they cannot remove the necessity for regular inspection and maintenance, which is essential for reliable operation.

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