A domestic fire alarm program ought to be installed on a separate circuit independent from any other services and have battery back up. The fire alarm heads for domestic premises typically come with an individual internal 9V battery back-up. The circuit has a low power source demand and can be fed from a 5A MCB and ought to be wired in between every single head with 1. mm or 1.5 mm, 3 core and earth cable for linkage in between the heads. The maximum length of the circuit ought to not exceed 100m for 1.0mm cable and 99m for 1.5 mm cable.
The quantity of smoke alarm heads required is ordinarily one on each and every floor of the property at the top of every single stair landing and 1 on the ground floor hallway near the stairs. A heat alarm detector have to be fitted in the kitchen rather of a smoke detector to stop nuisance activation. All domestic fire alarms that's mains fed have an extra terminal for linking in between each head in order that if one head is activated all heads will sound.
Sufficient duration fire protection need to be supplied to the fire alarm method in order to give enough warning in the event of a fire. Preferably pyro (mineral insulated) cable need to be used to wire the circuit but standard PVC twin and earth flat cable can be applied in domestic dwellings. Additional advanced fire systems with a control panel is commonly installed in larger dwellings that call for the monitoring of additional individual zones in the dwelling.
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