CQR Firebrand – Fire FAQ’s 2016-06-16T10:42:21+00:00

Fire FAQ’s

Earth Faults

This is a fault condition that arises when there is a leakage current between the installation wiring and the ground where the panel is connected.

To help diagnose this fault condition follow these steps:

1. Disconnect all cables connected to the panel and supply it only through the batteries. 2. Wait about 5 minutes and check the earth leakage fault persists. 3. Check the tension between the Earth and ground. This value must be found between 6V and 7V DC, if not, the motherboard needs to be inspected at CQR. 4. If the test of section 3 has been satisfactory connect the main power 230 VAC and repeat the test of point 3, if the value is out of limits the problem is in the mains power supply. 5. Connect a pair of cables (+/-, in/out, etc) to the panel at a time, repeating the test of point 3 until the measured voltage is not correct, then you have found the location of the fault. 6. Locate the cause of the failure by checking the possible causes listed below. The causes of this failure may be as follows: 1. Improper device wiring to the ground. 2. Damaged devices in the loops or sounder circuits. 3. Problems in the electrical main supply to the panel. 4. Humidity in the installation wiring. 5. Failure of the panel hardware caused by impurities or metal chips inside as result of drilling holes in the box.


What is the maximum batteries capacity (A/h) that I can install on a FireBrand system?

The maximum batteries capacity depends on the equipment as follows:

• Network: 12 A/h • Addressable: 7 A/h • Conventional: 7 A/h • External Sub-Panel: 12 A/h

Conventional Cable

The maximum length is 500 meters

Addressable Cable

The maximum recommended length is approximately 1200 m, but this value depends largely on the cable cross section and the load of the devices in that loop.

Detection Loops

You should always use shielded cable of the type appropriate for fire detection installations. Please note that cable types are also regulated by local authorities/ standards.

As a rule of thumb you should use:

a) 0,8 mm2 for loop lengths up to 500 m b) 1.0 mm2 for loop lengths up to 1000 m c) 1.5 mm2 for loop lengths up to 1500m d) 2.5 mm2 for loop lengths up to 2000 m The lengths specified include return to the main panel.