Docstoc

TESTING PROCEDURE OF FIRE DETECTION _ ALARM SYSTEM

Document Sample
TESTING PROCEDURE OF FIRE DETECTION _ ALARM SYSTEM Powered By Docstoc
					BHARAT SANCHAR NIGAM Ltd. ENGINEERING INSTRUCTIONS

PROTECTION FIRE A/T-001

TESTING PROCEDURE OF FIRE DETECTION & ALARM SYSTEM 1. SCOPE

This Engineering Instruction describes the standard testing procedure of fire/smoke detection and alarm system installed in Telephone Exchanges. 2. GENERAL

Testing procedure of fire detection installed in Electronic exchanges ensures early detection of fire/smoke in case of fire. Proper testing procedure able to render reliable and trouble free services. These fire/smoke detection systems are generally useful for all types of Electronic exchanges and similar telecom installations in telecom buildings etc. 3. i. ii. iii. iv. DOCUMENTS REQUIRED Approved /Drawing and lay out of the equipment. Copy of ordering specification. Copy of amendments, relaxation letters if any, approved by competent authority. Test schedule of the system.

Representative of ordering authority, maintenance authority and the supplier are also to be present during acceptance testing. 4. TESTS LAR – 4.1. (i) Location of all the equipment/ accessories connected with the system is checked as per the approved drawings and layout, „Deviations if any, be pointed out for rectification. (ii) In the technical rooms having false floor and false ceiling check location just above the racks (suits) in the return air path. Exact location of detectors to install on the ceiling or below false floor be determined after studying air movements & observing high smoke density area. For mixed monitoring Check provision of both, ionisation and optical detectors installed in the ratio 1:1.
BHARAT SANCHAR NIGAM LTD  Restricted to Telecom Staff Page 1 Issue 2, 21.11.01

(iii)

BHARAT SANCHAR NIGAM Ltd. ENGINEERING INSTRUCTIONS

PROTECTION FIRE A/T-001

(iv)

Check physically, installation of response indicators of hidden smoke detectors sited at more than 2‟ above the false floor on the wall/pillars at prominent place easily visible. Check the detectors density as follows or as per specification: 10 sq,m per detector in technical rooms and in no case more than 20 sqm. The detector's density in densely laid cables' area (below false floor) is 10 sqm/detector In A/C plant room 20 sqm/detector. In normal risk areas such as rooms without equipment 40 sqm/ detectors. Provision of detectors in return air opening. ALIGNMENT & RIGIDITY Check that all the equipment/ accessories for its proper alignment and rigidity.

(v) (a) (b) (c) (d) (e) 4.1.2

4.2.

ZONE The formation of minimum 2 zones in each floor be ensured.

4.3

Check of power supply

4.3.1. The A/C mains supply s taken through DPDT switch. Check properly lying, termination lugs, etc. In connecting cables. The cables used is exclusively for fire detection system. The multicore cables is not share for other low voltage or high voltage circuits. Cable and wiring are laid down in metallic /rigid PVC conduits. 4.3.2 Measure the dc voltage of correction. regulated supply, variation if any, be recorded for

4.3.3. Check proper fuse of required rating is provided. 4.3.4. Charge the battery on trickle and then boost mode for a while to check that 24 V, in built battery charger of power supply working satisfactory for its trickle/boost mode. 4.3.5. Proper installation, healthy condition & capacity (battery voltage & SG of cells may be checked) of the battery with security arrangement is also ensure. 4.4. CHECK ON MAIN, LOCAL CONTROL PANELS & PA SYSTEM

The fire/smoke detection system is connected to a local control panel in every floor. As soon as detector detects the smoke (by creating smoke below 1 feet any of the detector), the local control panel gives an audio visual alarm indicating that there is fire in the particular zone and verify, the working of Air-handling Unit of that floor stopped automatically. Use PA
Page 2 Issue 2, 21.11.01

BHARAT SANCHAR NIGAM Ltd. ENGINEERING INSTRUCTIONS

PROTECTION FIRE A/T-001

system to check for proper announcement about the exact location of fire incident & to evacuate the affected area patiently without blatant move. There is also a repeater control panel at such a place where attention is available round the clock. As soon as the detector detects the smoke or fire condition, check that the repeater control panel repeats audio-visual alarm indicating the location of fire. 4.4.1 On control panel operate lamp indication check-key to check indication of all the lamps similarly operate all other switches as per instructions of manual for their proper functioning. To check the functioning of zone, smoke is given to detectors of each zone and operation of local hooter with flash of LED for each zone is observed. Operate the reset push button key & observed that distant hooter and associated LED gets cut off. 4.4.2. Remove A.C. supply of main control panel & check the system change over to battery. At this time, functioning of local hooter (having distinct alarm from the fire alarm), its cut off facility and flashing of necessary visual indications (amber) is also ensured. 4.4.3 Operate the isolation keys one by one and check that the concern zone cut off from the control panel. Check that all panels are properly earthed. Operation of local hooter & LED indication be checked for polarity reversion, low battery, & blown fuse: by momentary reversing the +ve and -ve polarity. by connection a low battery in the circuit. by using blown fuse . ALARMS Ensure that – 4.5.1 4.5.2 4.5.3 the whole exchange area is covered by the audio visual alarm system. electronic hooter provided in switch room, exploitation room and lobbies of each floor. alarm signal actuated as soon as the artificially created smoke density rises in the area of detector installed.
Page 3 Issue 2, 21.11.01

4.4.4 4.4.5

(i) (ii) (iii) 4.5.1

BHARAT SANCHAR NIGAM Ltd. ENGINEERING INSTRUCTIONS

PROTECTION FIRE A/T-001

4.5.4. alarm signal is extended in OMC room so that the fire signal & time of detection of smoke gets printed. 4.5.5 Fault Signals

An immediate fault warning is checked by (a) visual indicators (amber) on the zone control panel, an audible alarm and visible indicator (amber) on main control panel. The audible alarm should be distinct from the fire alarm. Check warning alarm in the following occurrences by – (a) (b) 5. 5.1 removing the fuse of main power supply. disconnecting the stand by power supply. TESTING OF DETECTORS OPEN CIRCUIT TEST

All the ionisation/photo electric smoke detectors of a zone are looped and are terminated on a card in the control panel. Remove one terminal of Detector to make open circuit in the detectors loop, a corresponding fault indication of an open circuit will be displayed as an audible and visual alarm (amber) on the control panel. The audible alarm should be distinct from the fire alarm. Trace the faulty detector in the zone to checked the faulty detector. 5.1.1 5.2. Open circuit conditions is created at the last detector of individual zone. SHORT CIRCUIT TEST

Short the terminals of detector one by one in last detector of each zone, to create a short circuit in the detector circuit, in such a way so that every individual zone is checked for visual (amber) and a distinct audible alarm . 5.3 CLOSED CIRCUIT TEST

By puffing a cigarette smoke or allowing smoke of four incense stick, in to the chamber of detectors, just about a distant feet apart, the detector senses the smoke within 10 to 15 second and the red LED on the body of the detector glows permanently giving an audio visual alarm on the control panel and distant hooters also gives audio signal. The audible alarm contiue to operate until silenced manually. After pressing the alarm cancel push button on the control panel, the audio signal silenced, respective zone is to be surveyed to plot the source of smoke conversely. 5.4 RESPONSE INDICATORS
Page 4 Issue 2, 21.11.01

BHARAT SANCHAR NIGAM Ltd. ENGINEERING INSTRUCTIONS

PROTECTION FIRE A/T-001

Similarly test smoke detectors installed in the false floor and false ceiling, simultaneous operation of respective response indicators be also ensured. 5.5 Testing of Smoke detection by ionisation type smoke detectors will be followed by photo electric smoke detectors. The time taken by each detector is 10-30 seconds for its activation but never more then 60 seconds. 5.6 DUCT DETECTOR IN THE RETURN AIR PATH

Operation of duct detectors also checked as per above procedure. If these detectors operates before the blower getting shut off, indicated that fire condition has much aggravated. 5.7 HEAT DETECTORS

These are suitable for use in situation where sufficient heat is likely to be generated (for example, kitchen and pantry, etc.) These are not suitable for fire protection of places where larger losses can be caused by small fire and where safety of life is involved. Hence used in closets or other unsupervised spaces. For testing of restorable type detectors a heat source, such as heat of soft coke burnt with smokeless, a hair dryer, or a shielded heat lamp is used until it respond, making sure that the sensing element is not damaged. After each heat test, the detector is reset. Heat detectors with replaceable fusible alloy is tested first by removing the element to see whether contacts operate properly and then re-inserting them in proper position. 5.8 PHYSICAL INSTALLATION

Visual inspection of all the detectors is made to check that they are properly sited, mounted and connected in the following rooms. (i) (ii) (iii) (iv) 6. Switch room, Transmission room. MDF/DDF. A.C. plant room, AHU rooms, Battery rooms, Power rooms, Engine room etc. In corridors/lobbies . MANUAL CALL POINTS

Inspect that on each floor, one or more manual call points are installed, preferably on the exit routes. It is installed at a height of 1.4 meters above the floor. Check that its housing is dust proof and moisture proof properly sealed with rubber lining, red painted instructions given to break the glass, with hammer provided, in case, any fire is observed.

Page 5 Issue 2, 21.11.01

BHARAT SANCHAR NIGAM Ltd. ENGINEERING INSTRUCTIONS

PROTECTION FIRE A/T-001

For testing unscrew the outer cover, the respective LED in the control panel will flash alongwith audible alarm, to attract the attention of the exchange staff. 7. 7.1 SIGN WRITING Check that sign writing is completed in a understandable manner, for each and every detector preceded by alphabetic initials for example, Z-1/20 indicating zone one smoke detector, No. 20 etc. Spare zone as spare. Response indicators, manual call points etc. Electronic Hooters. DPDT switch is sign written in red paint as “FIRE ALARM SYSTEM”. Manual call points glass front cover as “IN CASE OF FIRE BREAK THE GLASS” by red paint. Check that sufficient fire fighting equipment for example, fire extinguishers, fire buckets installed at suitable place.

7.2 7.3 7.4 7.5 7.6

7.7

Source material: (1) Specification of Electrical wing. (2) IS 2189 - 1988 on code of practice for selection, Installation and maintenance of Automatic Fire Detection System.

** END **

Page 6 Issue 2, 21.11.01


				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:64
posted:11/9/2009
language:English
pages:6