Bs 7273-4 Categories - Fireco Dorgard X2 Fitting And Operating Manual

BS 7273-4 Categories

BS 7273-4 concerns the interface (Critical Signal Path) between fire detection and fire
alarm systems with forms of door hardware including devices to hold open self-closing fire
doors. The Critical Signal Path is the connection between the Fire alarm Control and
Indicating Equipment (CIE) and the door hardware. If the connection is compromised, the
door hardware must fail-to-safe. It is important to note that for acoustically actuated
systems, fire alarm sounder circuits are not deemed to be part of the Critical Signal Path.
There are three categories of actuation:
Category A
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Dorgard X must release and not hold open its door (fail-to-safe) within 120 seconds if any
of 12 specified faults or disablements occur on the connected CIE. Acoustic actuation is
not permitted for this category. Dorgard X
complies with this part of the standard.
Category B
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Dorgard X must fail-to-safe within 120 minutes if critical path or wiring faults occur or if
there is power loss to release mechanism, System X will fail-to-safe if there is a loss of
power to the control unit. Acoustic actuation is acceptable for this category. Dorgard X
installed with acoustically activated System X complies with this part of the standard.
Category C
As category B, but interface via another system. Critical Signal Path terminates at other
system (Dorgard). Acoustically activated Dorgard meets the requirements of category C.
A combination of categories can be used throughout a building according to the specific
needs of the areas in question on a risk assessed basis.
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installed and Linked to Hardwired System X
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