Void detection is a fraught issue, especially on new-build projects. From a design perspective, it is difficult to predict the amount of detection required and invariably, providing access for ongoing maintenance is a challenge.
From a design perspective it is difficult to predict the amount of detection required and invariably, providing access for ongoing maintenance is a challenge.
The traditional method
Conventional Void Detection using multiple ‘point-detectors’
The VoidAlert™ method
VoidAlert™heat sensitive sensor-wire is installed through the protected area between the VoidAlert™ Remote Indicator and VoidAlert™ Test Point. The Test Point is typically installed in an accessible location to facilitate ongoing engineer maintenance.
The VoidAlert™‘Test-Point’ incorporates a key switch with ‘normal’ and ‘test’ positions. Operation of the key switch tests the system for both ‘Open Circuit’ and ‘Fire’ conditions. In order to fault test the sensor-wire, the ‘test’ mode key position is selected and a simulated fire signal is generated to activate the Fire Alarm System. VoidAlert™ can be interfaced with all types of Fire Alarm System including conventional and addressable.
The VoidAlert™ Remote Indicator illuminates when the system is activated.
VoidAlert™ offers the following benefits:
BS5839-Part 1:2017 states:
22.2d) If the system Category is such that automatic fire detection should be provided in any area that contains a horizontal void of 800 mm or more in height, automatic fire detection should also be provided in the void.
22.3k) Ceiling obstructions, such as structural beams, deeper than 10% of the overall ceiling height should be treated as walls [see Figure 11a)].
NOTE 11 Within horizontal voids, beams or obstructions that are deeper than 10% of the overall depth of the void regardless of whether the void is above the ceiling or below the floor, ought to be treated as walls that subdivide the void.