FOCUS
Protection systems
or a completely wireless loop, such as that used with a hub and cluster system. Hybrid systems use a wireless interface module which connects to a wired loop, allowing the loop to be extended to include wireless devices. This enables the easy and quick expansion of an existing wired system. A full wireless solution consists of a main wireless interface module located at the control panel and a number of wireless interface modules located around the building which communicate with detectors and notification devices. The wireless interface modules in the fi eld provide a radio network, allowing all devices to communicate with the fire panel.
All of the usual components of a wired
fire system are available in wireless form, including call points, sounders and detectors. Also with the addition of wireless input/ output units, any device that provides a switched output can be converted into a wireless device. For example, the operation of a sprinkler pressure valve can be signalled wirelessly to the control panel. They can also be used to control the switching on and off of equipment such as smoke extractors and to shut down machinery. It is also worth being aware that
wireless systems are available for small installations utilising conventional panels
24 MAY 2018
www.frmjournal.com
with a conventional wireless communicator unit. This makes the installation of a small conventional fire system very rapid – install the panel and communicator then locate and fit detectors, call points and sounders as required, without a need for cabling. The following are some of the main advantages of wireless and hybrid wireless systems.
Reduced installation time
Without the need to install cable throughout a site, installation time is greatly reduced, and the speed at which a wireless installation can be completed reduces disruption in premises where access time is limited, such as schools or nursing homes. Another advantage is that wireless devices can be pre confi gured off site, including device addressing and logging to interface modules. This means the installation engineer only has to mount the devices in the correct location when on site.
Reduced installation costs
Given that in this case the need to install a site wide cable infrastructure is removed, on site installation time is greatly reduced with a wireless system. In addition, savings related to cable costs can offset the cost of wireless devices.
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