BRK electronic Mx-1000 manual Pre-Commissioning Wiring Check

○Fire and fault routing signalling should be tested.

WARNING: Before testing, the engineer must be aware both of the operation of all devices fitted to the auxiliary circuits and of the consequences of their operation.

13.4Pre-Commissioning Wiring Check

NOTE: This pre-commissioning wiring check procedure should be followed to test all wiring prior to specific commissioning of any detection, alarm and auxiliary circuits.

1.Ensure that no devices are connected to the detection zones and alarm circuits, but that the cables are linked through at the device locations to achieve a continuous circuit.

2.Ensure that the resistance of all cables to earth and between cores is at least 2MΩ. Check the following:

i)Positive to earth resistance is 2MΩ or greater.

ii)Negative to earth resistance is 2MΩ or greater.

iii)Positive to negative resistance is 2MΩ or greater.

3.Connect a wire link as the end-of-line device on each of the zones and alarm circuits. At the panel end, measure the resistance across the positive & negative ends of the cables for each of the circuits; ensuring the value does not exceed 20Ω. Remember to remove the wire links after the tests.

Correct polarity throughout all circuits must be maintained. Rectify any faults.

All bells, detector heads and call points should now be connected and the correct end-of-line devices fitted. Use the spare end-of-line devices supplied and leave the EOL devices in the panel terminals at this stage. Remember to remove any links fitted to detector bases. Be very careful to maintain correct polarity at each device.

Warning: Intrinsically safe zone arrangement.

○End-of-line capacitors cannot be connected to zones monitoring Intrinsically Safe detection devices in hazardous areas. To do so will risk causing an explosion in the hazardous area. End-of-line resistors with a value of 3K9Ω must be used, which comply with the requirements laid down in the installation data sheets provided with the I.S. barrier and the I.S. fire detection devices.

○In order for detector head removal monitoring to function correctly when resistors are used as the end-of-line devices, any diodes in the detector bases that are in circuit when the detector head is removed must be disconnected.

○The panel must be configured to monitor Intrinsically Safe zones.

○The first device on an Intrinsically Safe zone must be an I.S. Zener Barrier or Galvanic Isolator. Detectors and Manual Call Points on the Safe side of the barrier are not permitted.

○To comply with the requirements of BS5839, all manual call points should be located in the zone cabling between the I.S. Barrier/Isolator and the first detector. Any manual call point or detector located on the “end-of–line” side of a detector will be rendered inoperative if the detector head is removed.

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