Fire 2019 first-class fire engineer case analysis

2019 first-class fire engineer "case analysis" knowledge points: fire emergency lighting and evacuation indication signs

[knowledge point 5] wire and cable selection and line laying

1) when the output branch of emergency lighting centralized power supply and the control line of centralized control system are laid in the shaft, and there is no fire separation between wires and cables with combustion performance below B1 in the shaft, wires and cables with combustion performance of class A should be selected; When there is fire separation, wires and cables with combustion performance of

b1 can be selected

2) the output line of the emergency lighting distribution device and the control line of the centralized control system should be protected by metal pipes when the combustion performance of wires and cables is grade B1; It can also be laid in cable tray or trunking with the same combustion performance; When the combustion performance is selected as grade a wire and cable, it can be laid in the open

4) cables of different voltage levels should not be threaded into the same protective tube. When sharing the same slot, there should be metal partitions in the slot

5) the distribution branch line of the system should adopt copper core wire, and the control line should adopt multi strand copper core wire

[knowledge point 6] system commissioning

1) commissioning of fire emergency sign lamps and fire emergency lighting lamps

visually check whether the installation position of fire emergency sign lamps and the direction indicated by the arrow on the sign information are consistent with the actual evacuation direction

under dark conditions, turn the lighting fixtures into an emergency state, and measure the minimum horizontal illumination of the ground with an illuminometer, which should meet the design requirements

operate the test button or other test devices, and the fire emergency lamps should be turned into the emergency working state

disconnect the power supply of the fire emergency lamps that are continuously charged for 24h, turn the fire emergency lamps into the emergency working state, and start timing with a stopwatch at the same time; The main power indicator of fire emergency lamps shall be in a non lit state, and the emergency working time shall not be less than its nominal emergency working time

turn the sign lamps that flash in sequence to form the guiding optical flow into the emergency working state, and visually check that the optical flow guidance should be the same as the designed evacuation direction. Turn the sign lamp with voice indication into emergency working state, and its voice should be consistent with the design

cut off the emergency lighting distribution box or the power distribution device of the centralized power supply of emergency lighting in each area one by one, and the fire emergency lamps supplied by the distribution box or power distribution device shall be turned into the emergency working state within 5S

the fire emergency lighting and evacuation indication system controlled by the automatic fire alarm system inputs the linkage control signal, and the fire emergency lamps in the system should turn into the working state corresponding to the linkage control signal within 5S, and should send the linkage feedback signal; For the system designed with manual control function, operate the manual control mechanism to turn the system into emergency working state, and the corresponding fire emergency lamps shall turn into emergency working state within 5S

[knowledge point 7] system detection

1) fire emergency sign (lighting) lamp detection items have been operated for three consecutive times to observe the automatic emergency conversion of sign lamps

2) detection items of centralized power supply for emergency lighting

the centralized power supply for emergency lighting should display the main power voltage, battery voltage, output voltage and output current, and should be set with main power, charging, fault and emergency status

indicators. The main power status should be green, the fault status should be yellow, and the charging status and emergency status should be red

each output branch shall be protected separately, and the failure of any branch shall not affect the normal operation of other branches

[knowledge point 8] detection items of emergency lighting controller

1) the emergency lighting controller should be installed in the fire control room or duty room

2) the emergency lighting controller shall be able to control and display the working state of all fire emergency lamps connected with it, and display the emergency start time

3) the emergency lighting controller shall be able to prevent non professional personnel from operating

4) when the connecting line between the emergency lighting controller and the fire emergency lamps connected to it is open or short circuited (except that the fire emergency lamps turn into emergency state in case of short circuit), the emergency lighting controller shall send out audible and visual fault signals and indicate the fault position. The acoustic fault signal shall be able to be eliminated manually. When there is a new fault signal, the acoustic fault signal shall be able to restart. The optical fault signal shall be maintained before troubleshooting

8) the emergency lighting controller shall be able to turn all the fire emergency lamps connected to it into the emergency state manually and automatically, and a button shall be set to force all the fire emergency lamps into the emergency state

9) when the connecting line between the fire emergency lamp and the emergency lighting controller of a branch is open circuit, short circuit or grounded, the work of the fire emergency lamp and emergency power supply of other branches shall not be affected

[knowledge point 9] system function test items

1 Emergency control of non centralized control system

1) in places where there is no automatic fire alarm system, the system should enter the emergency working state after the normal lighting is interrupted

2) in places where automatic fire alarm system is set, the non centralized control system with its own power supply should use high-speed soft materials for automatic fire alarm, and the system should link each emergency lighting distribution box to realize the conversion of working state; The centralized power supply non centralized control system shall realize the conversion of working state by the automatic fire alarm system linking the centralized power supply of each emergency lighting and the emergency lighting distribution device

2. Due to the low cost performance of the tensile testing machine with this driving mode, the emergency control of the medium control system

1) the emergency lighting controller should be able to receive the fire alarm signal or linkage control signal of the automatic fire alarm system, and control the corresponding fire emergency lamps to turn into the emergency working state

2) for the centralized control system with its own power supply, the emergency lighting distribution box and corresponding fire emergency lamps and other accessories in the emergency lighting controller control system shall realize the conversion of working state

3) centralized power supply centralized control system, the emergency lighting controller controls the centralized power supply of emergency lighting in the system, the emergency lighting distribution device and the corresponding fire emergency lamps and other accessories to realize the conversion of working state

4) when the system needs to extinguish the emergency exit indicating sign lamps according to the fire alarm signal, the system can extinguish the fire emergency sign lamps indicating the exit and pointing to the exit only after receiving the fire alarm signal from the temperature sensing fire detector set at the emergency exit

5) the main power supply of the emergency lighting controller shall be powered by the fire power supply, and the standby power supply of the emergency lighting controller shall make the controller work for at least 3h after the main power supply is interrupted

[knowledge point 10] system maintenance management

the system should keep the system running continuously and normally in the process of daily management, and should not be interrupted at will; Regularly make the system self discharge, replace products with emergency discharge time less than 30min (super high-rise less than 60min) or replace their batteries; The service life of products in the system should meet the requirements of relevant national standards, and the products that reach the service life limit should be replaced in time; When the surface brightness of the fire emergency sign lamp is less than 15cd/m, it should be replaced immediately

check the fire emergency lighting every month. If it sends a fault signal or cannot be transferred to the emergency working state, check the battery voltage in time. If the battery voltage is too low, replace the battery in time; If the light source cannot be lit or has other faults, the maintenance personnel of the product manufacturer shall be notified in time for repair or replacement

check the status of emergency lighting centralized power supply and emergency lighting controller every month. In case of any fault, the maintenance personnel of the product manufacturer shall be notified in time for repair or replacement

check and test the following functions of the system every quarter:

1) check the indication status of fire emergency lamps, emergency lighting centralized power supply and emergency lighting controller

2) check the emergency working time

3) check the control function of turning into emergency working state. Check and test the following functions of the system every year:

1) in addition to the contents of quarterly inspection, the battery shall also be tested for capacity detection

2) test the emergency function

3) test the automatic and manual emergency functions, and conduct the linkage test with the automatic fire alarm system

tips on alumni of globegroup: the above content is the "knowledge points related to the case analysis of plant building fire protection" sorted out for you by the first-class fire engineer channel of globegroup. For more simulated questions, real questions over the years, high-frequency test sites, and test preparation strategies, please click the free download page below to download and learn

relevant recommendations:

case analysis of detection and acceptance of fire emergency lighting and evacuation indicator signs

[knowledge point 1] on site installation and power supply, wiring inspection

1) plug connection cannot be used between fire emergency lamps and power supply lines, which will not affect the passage of people after installation, there is no shelter around the lamps, and the upper end of the lifting pipe is firmly fixed during hoisting

2) the fire emergency sign lamps with evacuation direction indicating arrows shall be installed in the same direction as the evacuation direction, and the fire emergency sign lamps indicating the exit shall be fixed on the solid wall or under the ceiling

3) as an auxiliary indication, the light storage signboard is installed on the same route as the indication direction of the sign lamp, but it cannot replace the sign lamp

4) fire emergency lighting lamps are powered by a special circuit in the incoming general distribution box

5) the normal power supply circuit of the decentralized centralized power supply should be taken from the (standby) emergency lighting distribution box in the fire compartment, and the emergency return circuit of the power distribution device should be powered by the centralized power supply of the emergency lighting

[knowledge point 2] function test

1 Fire emergency sign lamp test

1) the status indicator of the lamp should be normal

2) check that the direction indicated by the evacuation sign of the lamp should be consistent with the actual evacuation direction

3) press the test button for three consecutive times to make the sign lamp in the emergency working state, and record the emergency working time, which should not be less than the nominal emergency working time of the lamp itself

4) operate the test button and start the safety exit sign lamp with voice function. The voice should meet the requirements of the lamp manual

2. Fire emergency lighting lamp test

1) observe whether the lamp is in normal working state without fault, and the status indicator should be normal

2) check the lighting fixtures with separate light source and power supply, and the test button and status indicator of the power supply can be operated and observed conveniently

3) press the test button for three consecutive times to make the lighting fixtures in emergency working state, and record the emergency working time, which shall not be less than the nominal emergency working time of the lighting fixtures

4) the minimum illumination value of the installation area shall meet the design requirements

5) the light source and heat insulation of lighting fixtures shall meet the requirements

[knowledge point 3] judgment of inspection and acceptance conclusion

1 After introducing high-quality aluminum water from Weiqiao entrepreneurial group, the sampling proportion and quantity of lamps can be tested. The total number of lamps exceeds 5, so the number of function tests is selected according to the proportion of 10% of the actual installed quantity. All emergency lighting distribution boxes are checked, and the linkage function test is carried out 1 ~ 2 times

2. The evaluation rules

documents and data review should all meet the requirements; The on-site installation, wiring and power supply inspection shall meet the requirements; If there are unqualified items, the construction unit is allowed to rectify on site or within a time limit; The inspection of functional test items shall meet the requirements. If there are unqualified items, the construction unit is allowed to rectify them on site or within a time limit, and