Fire alarm receiver

Abstract

The present invention aims to efficiently perform insulation resistance testing of voltage circuits in fire detection systems. [Solution] The fire alarm receiver of the present invention comprises an insulation resistance test switch and a first terminal and a second terminal provided corresponding to a voltage circuit, wherein, during fire monitoring, the insulation resistance test switch conducts the first terminal to the first internal wire and conducts the second terminal to the second internal wire, and during insulation resistance testing of a voltage circuit, the insulation resistance test switch disconnects the first terminal and the second terminal from the first internal wire and the second internal wire and conducts electricity to each other.

Description

Technical Field

[0001] The present invention relates to a fire receiver.

Background Art

[0002] In a general fire detection system, a local line circuit connecting a sensing line and a plurality of fire detectors is connected to a fire receiver. The local line circuit is a voltage circuit. When a fire phenomenon is detected by a fire detector, sensing information is transmitted to the fire receiver via the sensing line. Other voltage circuits are also connected to the fire detector.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The voltage circuit connected to the fire receiver may be electrically connected to the ground outside the fire receiver. For example, in a local line circuit which is a voltage circuit, lines such as sensing lines are laid around a building or the like where a fire detection system is installed and are connected to fire detectors installed at various locations. The local line circuit should be insulated from the ground. Therefore, an insulation resistance test is regularly performed to confirm that the line is insulated from the ground.

[0005] To prevent excessive voltage from being applied to the fire alarm receiver, the detection wires are disconnected from the receiver's terminals when conducting insulation tests on district circuitry. The resistance between the receiver's ground terminal and the disconnected detection wire is then measured using an insulation resistance meter called a megger, and it is confirmed that a resistance value equal to or greater than the specified value is obtained. However, the process of disconnecting the detection wires from the receiver's terminals, applying a probe connected to the megger, and then reconnecting the wires to the terminals is time-consuming. This is especially true for fire alarm receivers with numerous detection wires connected. The same applies to voltage circuits other than district circuitry.

[0006] The present invention aims to efficiently perform insulation resistance testing of voltage circuits in fire detection systems. [Means for solving the problem]

[0007] A fire alarm receiver in one embodiment of the present invention comprises an insulation resistance test switch and a first terminal and a second terminal provided corresponding to a voltage circuit, wherein, during fire monitoring, the insulation resistance test switch connects the first terminal to the first internal wire and the second terminal to the second internal wire, and during insulation resistance testing of a voltage circuit, the insulation resistance test switch disconnects the first terminal and the second terminal from the first internal wire and the second internal wire and connects them to each other. [Effects of the Invention]

[0008] The present invention enables efficient insulation resistance testing of voltage circuits in fire detection systems. [Brief explanation of the drawing]

[0009] [Figure 1] This diagram shows the insulation resistance test of the district circuit in a conventional fire alarm receiver. [Figure 2] This figure shows the insulation resistance test of the district circuit using the fire alarm receiver in Examples 1 and 2. [Figure 3] Internal configuration diagram of the fire alarm receiver in Example 1 during fire monitoring. [Figure 4] Internal configuration diagram of the fire alarm receiver in Example 1 during insulation resistance testing. [Figure 5] Flowchart of the insulation resistance test of the district circuit in the fire alarm receiver of Example 1. [Figure 6] Internal configuration diagram of the fire alarm receiver in Example 2 during insulation resistance testing. [Figure 7] Flowchart of the insulation resistance test of the district circuit in the fire alarm receiver of Example 2. [Modes for carrying out the invention]

[0010] Figure 1 shows the insulation resistance test of the district circuit DC in a conventional fire alarm receiver 6. Multiple district circuit DCs are connected to the fire alarm receiver 6. The district circuit DC, which is a voltage circuit, is equipped with two sensing wires 2, multiple fire detectors 3, and a termination device 4. In the district circuit DC, the two sensing wires 2 connect the multiple fire detectors 3 with jumper wiring. At the end of the jumper wiring, the two sensing wires 2 are connected to the termination device 4. The fire alarm receiver 6 is provided with a district terminal set DT for each district circuit DC, consisting of a first terminal L terminal 61 and a second terminal C terminal 62.

[0011] When performing an insulation resistance test, the clip CL connected to the megohmmeter (MG) is connected to the ground terminal 64 of the fire alarm receiver 6. In conventional fire alarm receivers 6, as shown in the upper part of Figure 1, the detection wires 2 are removed from terminals L 61 and C 62, and the probe PB connected to the megohmmeter is applied to both detection wires 2 simultaneously to measure the insulation resistance of the area circuit DC. If the insulation of the area circuit DC is insufficient, current will flow between the detection wires 2 and the ground through the building where the area circuit DC is installed, so this measurement allows confirmation of the insulation between the detection wires 2 and the ground.

[0012] If the probe PB is touched to terminals L 61 and C 62 without disconnecting the sensing wire 2 from terminals L 61 and C 62, the resistance value of the internal circuit of the fire alarm receiver 6 may also be measured, or an excessive voltage may be applied to the internal circuit of the fire alarm receiver 6 from the megohmmeter MG. Therefore, when measuring the insulation resistance of the area circuit DC with the megohmmeter MG, it is necessary to disconnect the sensing wire 2 from the fire alarm receiver 6. Thus, the process of disconnecting the sensing wire 2 from terminals L 61 and C 62, measuring the resistance value, and then reconnecting the sensing wire 2 to terminals L 61 and C 62 is time-consuming and laborious. In particular, if there are many area circuit DCs connected to the fire alarm receiver 6, measuring the resistance value will take a lot of time. [Examples]

[0013] Figure 2 shows the insulation resistance test of the district circuit DC using the fire alarm receiver 1 in Example 1, which is an embodiment of the present invention. Since Figure 2 will also be used in Example 2, which will be described later, the reference numerals for Example 2 are also included, and therefore the reference numerals for Example 2 will also be explained. The district terminal set DT of the fire alarm receivers 1 and 5 is provided with T terminals 13 and 53, which are insulation resistance test terminals, in addition to the first terminals L terminals 11 and 51 and the second terminals C terminals 12 and 52. Then, the resistance value is measured by bringing the probe PB into contact with the T terminals 13 and 53. The configuration of the district circuit DC, etc., is the same as in the case of the conventional fire alarm receiver 6.

[0014] Figure 3 shows the internal configuration of the fire alarm receiver 1 in Embodiment 1 during fire monitoring. The insulation resistance test switch 15 is equipped with terminals L1 151, C1 152, T1 153, L2 154, and C2 155, corresponding to the individual area terminal sets DT. Terminal L1 151 is connected to terminal L 11, terminal C1 152 is connected to terminal C 12, and terminal T1 153 is connected to terminal T 13. In addition, terminal L2 154 is connected to the first extension 16 of the fire alarm receiver 1, and terminal C2 is connected to the second extension 17 of the fire alarm receiver 1.

[0015] The first internal wire 16 is the wiring that is connected to the L terminal 61 in the conventional fire receiver 6, and the second internal wire 17 is the wiring that is connected to the C terminal 62 in the conventional fire receiver 6. In the fire receiver 1 of the first embodiment, an insulation resistance test switch 15 is provided between the first internal wire (not shown) and the L terminal 61 and between the second internal wire (not shown) and the C terminal 62 in the conventional fire receiver 6.

[0016] During fire monitoring, as shown in FIG. 3, the insulation resistance test switch 15 is in the fire monitoring connection state. In the fire monitoring connection, in all the zone terminal sets DT, the insulation resistance test switch 15 conducts the first internal wire 16 with the L terminal 11 which is the first terminal and conducts the second internal wire 17 with the C terminal 12 which is the second terminal. At this time, the L1 terminal 151 of the insulation resistance test switch 15 is connected to the L2 terminal 154, and the C1 terminal 152 is connected to the C2 terminal 155. Therefore, similar to the conventional fire receiver 6, in the fire receiver 1, the L terminal 11 is electrically connected to the first internal wire 16, the C terminal 12 is electrically connected to the second internal wire 17, and the fire detector 3 is monitored by the sensing wire 2 shown in FIG. 2. Further, the insulation resistance test switch 15 is operable and includes an operation display unit 156 having a display function. The operation display unit 156 is provided with a switch element and an LED inside, and is a push button switch that lights up.

[0017] FIG. 4 shows the internal configuration of the fire receiver 1 of the first embodiment during the insulation resistance test. During the insulation resistance test, the tester presses the operation display unit 156 with the insulation resistance test switch 15 in the fire monitoring connection shown in FIG. 3. Then, the insulation resistance test switch 15 switches to the insulation resistance test connection as shown in FIG. 4, and the operation display unit 156 lights up to indicate that the fire receiver 1 is in the insulation resistance test connection state.

[0018] In the insulation resistance test connection, for all zone terminal sets DT, the insulation resistance test switch 15 disconnects the L terminal 11, which is the first terminal, and the C terminal 12, which is the second terminal, from the first inner wire 16 and the second inner wire 17 and makes them conduct with each other. At this time, the L1 terminal 151 and the C1 terminal 152 are connected to the T1 terminal 153. The connection between the L1 terminal 151 and the L2 terminal 154 is disconnected, and the connection between the C1 terminal 152 and the C2 terminal 155 is also disconnected. In the insulation resistance test connection, the L terminal 11, the C terminal 12, and the T terminal 13 are short-circuited for each zone terminal set DT, and these terminals are disconnected from the internal wiring of the fire receiver 1 such as the first inner wire 16 and the second inner wire 17.

[0019] In the state shown in FIG. 4, the tester connects the clip CL to the ground terminal 14 of the fire receiver 1 and makes the probe PB contact the T terminal 13. Thereby, in the fire receiver 1 with the insulation resistance test switch 15 set to the insulation resistance test connection, the resistance value of the insulation resistance of the zone line circuit DC shown in FIG. 2 can be measured with the megger MG.

[0020] FIG. 5 shows the flow of the insulation resistance test of the zone line circuit DC in the fire receiver 1 of the first embodiment. The operations of the tester are shown surrounded by thick lines. Before the start of the insulation resistance test, the insulation resistance test switch 15 is in the fire monitoring connection shown in FIG. 3. When the insulation resistance test switch 15 is in the fire monitoring connection, the fire receiver 1 can perform fire monitoring.

[0021] To begin the insulation resistance test, the tester connects the clip CL, which is connected to the megger MG, to the ground terminal 14 of the fire alarm receiver 1 (step S1). Then, the tester presses the operation indicator 156 on the insulation resistance test switch 15 of the fire alarm receiver 1 (step S2). As a result, the insulation resistance test switch 15 of the fire alarm receiver 1 switches the connection destination of all L1 terminals 151 from L2 terminal 154 to T1 terminal 153. Also, the connection destination of all C1 terminals 152 switches from C2 terminal 155 to T1 terminal 153. Then, the operation indicator 156 lights up (step S3). In this insulation resistance test connection of the insulation resistance test switch 15, the first terminal, L terminal 11, and the second terminal, C terminal 12, are disconnected from the first internal wire 16 and the second internal wire 17 and become conductive to each other. The illumination of the operation indicator 156 indicates that the insulation resistance test connection is active, and the tester can recognize that the insulation resistance test switch 15 is in the insulation resistance test connection shown in Figure 4.

[0022] With the operation indicator 156 illuminated, the tester applies probe PB to terminal T 13 and measures the insulation resistance of the local circuit DC using a megohmmeter MG, confirming that the resistance value is equal to or greater than the predetermined value. The tester then sequentially applies probe PB to all terminals 13 and measures the resistance value to confirm the insulation of each local circuit DC (step S4). If a local circuit DC is found that does not yield a resistance value equal to or greater than the predetermined value, the tester will locate and repair the insulation fault in that local circuit DC to ensure its insulation.

[0023] When the insulation resistance test is completed for all district circuit DCs, the tester presses the operation indicator 156 (step S5). At this point, all L1 terminals 151 on the insulation resistance test switch 15 switch from the T1 terminal 153 to the L2 terminal 154 connection, and all C1 terminals 152 switch from the T1 terminal 153 to the C2 terminal 155 connection, so that the insulation resistance test switch 15 becomes the fire monitoring connection shown in Figure 3, and the operation indicator 156 turns off (step S6).

[0024] Once the operation indicator 156 has turned off, the tester removes the clip CL from the ground terminal 14 (step S7). Then, the insulation resistance test of the district circuit DC of the fire alarm receiver 1 is completed. [Examples]

[0025] In the fire alarm receiver 1 of Example 1, the insulation of each local circuit DC is checked sequentially. Therefore, in fire alarm receiver 1, which has a large number of local circuit DCs, it takes time to complete the insulation resistance test. Since it is rare for repairs to be performed due to insufficient insulation of local circuit DCs, it is more efficient to perform the insulation resistance test on multiple local circuit DCs at once. In the fire alarm receiver 5 of Example 2, the insulation resistance test of fire alarm receiver 5 can be completed in a short time by performing the insulation resistance test on multiple local circuit DCs at once.

[0026] Figure 2 shows the insulation resistance test of the local circuit DC using the fire alarm receiver 5 in Embodiment 2 of the present invention. Figure 6 shows the internal configuration of the fire alarm receiver 5 in Embodiment 2 during the insulation resistance test. The fire alarm receiver 5 is connected to L terminal 51, C terminal 52, and T terminal 53, and to the internal first extension 56 and second extension 57. It is also equipped with L1 terminal 551, C1 terminal 552, T1 terminal 553, L2 terminal 554, and C2 terminal 555. The configuration of the insulation resistance test switch 55 is basically the same as the insulation resistance test switch 15 in the fire alarm receiver 1 of Embodiment 1.

[0027] Unlike Example 1, the fire alarm receiver 5 in Example 2 is equipped with a multi-circuit test switch 58 that conducts the L terminal 51, which is the first terminal, and the C terminal 52, which is the second terminal, corresponding to multiple district circuit DCs, during multi-circuit testing. It is also equipped with a multi-circuit connection line 59 for conducting the terminals corresponding to multiple district circuit DCs. The multi-circuit test switch 58 is a switch that opens and closes the connection between the T2 terminal 581 and the T3 terminal 582, which are provided corresponding to the district terminal set DT. The multi-circuit test switch 58 conducts the L terminal 51 (first terminal) and the C terminal 52 (second terminal), which correspond to multiple voltage circuits. Each T2 terminal 581 is connected to the T1 terminal 553. In addition, all T3 terminals 582 are connected by the multi-circuit connection line 59. The T2 terminals 581 and T3 terminals 582 corresponding to all district terminal sets DT can be opened or closed simultaneously by operating the operation display unit 583. Furthermore, the operation display unit 583 indicates that the fire alarm receiver 5 is in a multi-circuit test connection state when it is lit, and indicates that it is in an individual-circuit test connection state when it is off.

[0028] Figure 6 shows a multi-circuit test connection in a fully closed state, where the on / off switches between all T2 terminals 581 and T3 terminals 582 are closed on the multi-circuit test switch 58. The insulation resistance test switch 55 is in an insulation resistance test connection, where all L1 terminals 551 are disconnected from L2 terminal 554 and connected to T1 terminal 553, and all C1 terminals 552 are disconnected from C2 terminal 555 and connected to T1 terminal 553. In this state, L terminals 51, C terminals 52, and T terminals 53 in all district terminal sets DT are conductive. Therefore, if the insulation performance is poor in any district circuit DC, a low resistance value can be obtained by touching probe PB to any T terminal 53 and measuring the resistance. Conversely, if the insulation performance is good in any district circuit DC, a high resistance value will be obtained. Therefore, if the resistance value is high in the state shown in Figure 6, the tester can confirm that there are no problems in any district circuit DC.

[0029] Figure 7 shows the flow chart for the insulation resistance test of the local circuit DC in the fire alarm receiver 5 of Example 2. Similar to Figure 5, the tester's work is enclosed in a thick line. Before the start of the insulation resistance test, the insulation resistance test switch 55 shown in Figure 6 is connected to the fire monitoring system in the same way as shown in Figure 3 of Example 1. Also, unlike in Figure 6, all the on / off switches on the multi-circuit test switch 58 are open before the start of the insulation resistance test. Note that before the start of the insulation resistance test, terminals L1 551 and C1 552 are not connected to terminal T1 553. Therefore, some or all of the on / off switches included in the multi-circuit test switch 58 may be closed. When the insulation resistance test switch 55 is connected to the fire monitoring system, the fire alarm receiver 5 can perform fire monitoring.

[0030] When the insulation resistance test is started, the tester connects the clip CL connected to the megger MG to the ground terminal 54 of the fire alarm receiver 5 (step S11). Then, the tester presses the operation indicator 583 of the multi-circuit test switch 58 (step S12). As shown in Figure 6, the multi-circuit test switch 58 then closes completely, the insulation resistance test switch 55 is set to insulation resistance test connection, and the operation indicators 583 and 556 light up (step S13). In Embodiment 2, the insulation resistance test switch 55 turns on in conjunction with the multi-circuit test switch 58 being turned on, and by pressing the operation indicator 583, the insulation resistance test switch 55 is set to insulation resistance test connection without the operation indicator 556 being pressed, and the operation indicator 556 lights up.

[0031] When the multi-circuit test switch 58 is fully closed, all connections between T2 terminals 581 and T3 terminals 582 are closed, as shown in Figure 6. Also, when the insulation resistance test switch 55 of the fire alarm receiver 5 is set to the insulation resistance test connection, all connections of L1 terminals 551 switch from L2 terminal 554 to T1 terminal 553, and all connections of C1 terminals 552 switch from C2 terminal 555 to T1 terminal 553. By setting the insulation resistance test switch 55 to the insulation resistance test connection in this way, the first terminal, L terminal 51, and the second terminal, C terminal 52, are disconnected from the first extension 56 and the second extension 57, and become conductive to each other. Furthermore, since all on / off switches on the multi-circuit test switch 58 are closed and all T1 terminals 553 are conductive, all L terminals 51, C terminals 52, and T terminals 53 are conductive.

[0032] The illumination of the operation indicators 583 and 556 indicates that the fire alarm receiver 5 is performing a multi-circuit test. The illumination of the operation indicators 583 and 556 allows the tester to recognize that the multi-circuit test switch 58 and the insulation resistance test switch 55 are connected in the insulation resistance test configuration shown in Figure 6.

[0033] The tester places the probe PB on either T terminal 53 while the operation indicators 583 and 556 are illuminated. Then, the megger MG measures the insulation resistance of all district circuit DCs (step S14) and determines whether the resistance value is above a predetermined value (step S15).

[0034] If the resistance value is higher than the predetermined value (YES), then there are no insulation problems in all district circuit DCs connected to the fire alarm receiver 5. In this case, the tester presses the operation indicator 583 again to end the insulation resistance test of the fire alarm receiver 5 (step S16). This opens all on / off switches of the multi-circuit test switch 58, the insulation resistance test switch 55 is connected to fire monitoring, and the operation indicators 583 and 556 turn off (step S17).

[0035] In the fire monitoring connection, all L1 terminals 551 are disconnected from T1 terminal 553 and closed to L2 terminal 554. Similarly, all C1 terminals 552 are disconnected from T1 terminal 553 and closed to C2 terminal 555. As a result, in the fire monitoring connection, the district circuit DC is connected to the first extension 56 and the second extension 57, enabling fire monitoring. Since the insulation resistance test switch 55 is the fire monitoring connection, some or all of the on / off switches of the multi-circuit test switch 58 may be closed.

[0036] The tester confirms that the operation indicators 583 and 556 are off, and then removes the clip CL from the ground terminal 54 (step S18). The insulation resistance test of the fire alarm receiver 5 is then completed.

[0037] On the other hand, if the resistance value in step S15 is not higher than the predetermined value (NO), it indicates that there is an insulation problem in one of the district circuit DCs connected to the fire alarm receiver 5. In this case, the tester presses the operation indicator 556 of the insulation resistance test switch 55 (step S21). As a result, the insulation resistance test switch 55 remains in the insulation resistance test connection position, all on / off switches of the multiple circuit test switch 58 are fully open in the individual resistance test connection position, and the operation indicator 583 turns off (step S22). The operation indicator 556 remains lit. In this state, the district circuit DCs are not conducting to each other, as in Example 1. Therefore, an insulation resistance test can be performed individually for each district circuit DC.

[0038] The operator confirms that all multiple circuit test switches 58 are open by the operation indicator 583 being off, and that the insulation resistance test switch 55 is connected to the insulation resistance test by the operation indicator 556 being lit. Then, the operator sequentially applies the probe PB to all T terminals 53 and measures the resistance value (step S23). This allows the operator to identify the district circuit circuit DC with insulation problems. For the district circuit circuit DC with insulation problems, the operator searches for and repairs the insulation fault, as in Example 1, to ensure insulation.

[0039] Once the probe PB has been applied to all T terminals 53 and the testing of all district circuit DCs is complete, the tester presses the illuminated operation indicator 556 (step S24). This sets the insulation resistance test switch 55 to fire monitoring connection, and the operation indicator 556 turns off (step S25). At this time, the operation indicator 583 is also off.

[0040] Once the operation indicator 556 has turned off, the tester removes the clip CL from the ground terminal 54 (step S18). The insulation resistance test of the fire alarm receiver 5 is then completed.

[0041] In the fire alarm receiver 5 of Example 2, if the operation display unit 556 is pressed without pressing the operation display unit 583, all on / off switches of the multiple circuit test switch 58 are opened, resulting in a fully open individual resistance test connection, and the insulation resistance test switch 55 switches to an insulation resistance test connection. At this time, only the operation display unit 556 lights up. This makes it possible to sequentially apply the probe PB to the T terminal 53 from the beginning and sequentially test the area circuit DC.

[0042] In the fire alarm receivers 1 and 5 of Examples 1 and 2, T terminals 13 and 53, which are insulation resistance test terminals, were provided, and the probe PB was made contact with them. However, since the L terminals 11 and 51, C terminals 12 and 52, and T terminals 13 and 53 are conductive during the insulation resistance test, the insulation resistance value may be measured with a megger MG by making contact with the L terminals 11 and 51 or the C terminals 12 and 52, without providing T terminals 13 and 53.

[0043] The configuration of the insulation resistance test switch 15 in the fire alarm receiver 1 of Example 1 can be retrofitted as an insulation resistance test device to the multiple adjacent area terminal set DT in a conventional fire alarm receiver 6. In this case, if the insulation resistance test device is configured without a T terminal, it can be easily retrofitted even if the space between the L terminal 61 and the C terminal 62 in the conventional fire alarm receiver 6 is narrow. The same applies to Example 2, in which the insulation resistance test switch 55 and the multiple line test switch 58 can be retrofitted.

[0044] In Examples 1 and 2, the operation indicators 156, 556, and 583 light up to indicate that it is an insulation resistance test connection or a multiple-circuit test connection. However, these states may also be indicated by LED lamps or the like, which are provided separately from the liquid crystal display or operation unit.

[0045] In Example 2, all on / off switches of the multi-circuit test switch 58 were closed, and the insulation resistance test of the fire alarm receiver 5 was performed all at once. However, multiple district circuit DCs may be grouped together, and the insulation resistance test may be performed in multiple steps for each group.

[0046] In Example 2, the insulation resistance test switch 55 is linked to the multi-circuit test switch 58, and by pressing the operation indicator 583, the insulation resistance test switch 55 is connected to the insulation resistance test without the operation indicator 556 being pressed, and the operation indicator 556 lights up. However, the insulation resistance test switch 55 and the multi-circuit test switch 58 may not be linked, and the tester may perform the test by pressing both the operation indicator 556 and the operation indicator 583.

[0047] In this embodiment, an insulation resistance test is performed on a district circuit to which a fire detector is connected, without removing the wiring from the terminals. However, the above technique can also be used for other voltage circuits (operation circuits, indicator light circuits, etc.) listed as items of "insulation resistance test" under "wiring" in Section 28 of the Fire and Disaster Management Agency's "Test Standards for Fire-fighting Equipment, etc." notification (Fire Prevention Bureau Notification No. 282). For example, in the case of an indicator light circuit, an insulation resistance test switch that connects the first and second terminals may be provided for the voltage circuit of the indicator light connected to the fire alarm receiver.

[0048] Furthermore, the specific configuration is not limited to the embodiments, and any design changes, etc., that do not depart from the spirit of the present invention are also included. In addition, the above-described embodiments and modifications can be combined by utilizing each other's technologies, as long as there are no particular contradictions or problems in their purpose and configuration. [Explanation of symbols]

[0049] MG Megger, PB Probe, CL Clip, DC District Circuit, DT District Terminal Set, 1 Fire alarm receiver, 11 L terminal, 12 C terminal, 13 T terminal, 14 Ground terminal, 15 Insulation resistance test switch, 151 L1 terminal, 152 C1 terminal, 153 T1 terminal, 154 L2 terminal, 155 C2 terminal, 156 Operation display unit, 16 First extension, 17 Second extension, 2 sensing wires, 3 fire detector, 4 Termination device, 5 Fire alarm receiver, 51 L terminal, 52 C terminal, 53 T terminal, 54 Ground terminal, 55 Insulation resistance test switch, 551 L1 terminal, 552 C1 terminal, 553 T1 terminal, 554 L2 terminal, 555 C2 terminal, 556 Operation display unit, 56 First extension, 57 Second extension, 58 Multiple line test switch, 581 T2 terminal, 582 T3 terminal, 583 Operation display unit, 59 Multiple line connection line, 6 Fire alarm receiver, 61 L terminal, 62 C terminal, 63 T terminal, 64 Ground terminal,

Claims

1. It comprises an insulation resistance test switch and a first terminal and a second terminal provided corresponding to the voltage circuit, During fire monitoring, the insulation resistance test switch connects the first terminal to the first internal wire and the second terminal to the second internal wire. A fire alarm receiver characterized in that, during an insulation resistance test of a voltage circuit, the insulation resistance test switch disconnects the first terminal and the second terminal from the first internal wire and the second internal wire, and makes them electrically conductive to each other.

2. The fire alarm receiver according to claim 1, characterized in that the insulation resistance test switch indicates that an insulation resistance test connection is being made when the first terminal and the second terminal are electrically connected.

3. The fire alarm receiver according to claim 1, characterized in that a multi-circuit test switch is provided that conducts the first terminal and the second terminal corresponding to multiple voltage circuits during multi-circuit testing.

4. The fire alarm receiver according to claim 3, characterized in that when the multiple circuit test switch makes the first terminal and the second terminal corresponding to multiple voltage circuits conductive, it indicates that a multiple circuit test connection is in operation.

5. It is equipped with insulation resistance test terminals corresponding to the voltage circuit, A fire alarm receiver according to any one of claims 1 to 4, characterized in that the first terminal and the second terminal are electrically connected to the insulation resistance test terminal during an insulation resistance test.

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