JP2012173023A - Wiring checker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiring checker which, in spite of a simple structure, can easily inspect the presence or absence of failed wiring of a neutral electrode N and a ground wire electrode E in, for example, a receptacle with a grounding electrode.SOLUTION: The wiring checker includes three plug blades of a voltage side plug blade 11 to be connected to an active wire electrode L, a neutral electrode plug blade 21 to be connected to the neutral electrode N, and a ground wire plug blade 31 to be connected to the ground wire electrode E. Between the voltage side plug blade 11 and the neutral electrode plug blade 21, a resistance circuit 40 is connected which preferably includes a high resistance element RH and a low resistance element RL in series, a volt meter 50 is connected between both ends of the low resistance element RL, and the ground wire plug blade 31 is connected to the low potential side of the low resistance element RL via a switch SW1. Using the measured voltage Von of the volt meter 50 when the switch SW1 is turned on and the measured voltage Voff of the volt meter 50 when the switch SW1 is turned off, it determines the presence or absence of the failed wiring.

Description

  The present invention relates to a wiring checker for inspecting the wiring state of an indoor lead-in wiring of a live line and a neutral line of a commercial power supply line, and a ground line connected to the ground, and more specifically, a neutral electrode in an outlet with a ground electrode. The present invention relates to a wiring checker having a simple configuration suitable for inspecting whether or not there is a miswiring between (N) and a grounding wire electrode (E).

  According to the revised internal regulations issued by the Japan Electric Association, electrical outlets for household electrical appliances such as electric washing machines, microwave ovens and electric refrigerators, etc. The use of incoming outlets) has been upgraded from the previous advisory to mandatory.

  As shown to Fig.5 (a), the outlet 1 with a ground pole is connected to the ground, and the live electric wire pole L and the neutral pole N which are connected to the secondary side of the pole transformer TR included in the commercial power line. There are three terminals of the grounding wire pole E. In this case, type B grounding (system grounding) is applied to the neutral pole N, and type D grounding (equipment grounding) is applied to the grounding wire pole E.

  As shown in FIG. 5 (b), the live wire pole L and the neutral pole N are drawn indoors through the earth leakage breaker 3 in the distribution board 2, and the ground wire pole E is in the distribution board 2. For example, in wiring work from the distribution board 2 to the load side, the neutral electrode N and the ground wire electrode E are reversed as shown in FIG. Connection (incorrect wiring), that is, the neutral pole N may be grounded with D type, and the ground wire pole E may be grounded with B class.

  In such a case, the leakage breaker 3 often falls when a load is connected. If the earth leakage breaker 3 does not operate for some reason, or if the earth leakage breaker 3 is not installed, the current that should flow through the N pole ground side wire (neutral wire) flows into the ground from the earth wire (class D ground). Then, a phenomenon of returning to the pole transformer TR from the B type grounding occurs.

  In this way, when current flows through the ground, a potential increase occurs in the ground, and the grounding wire poles of computers and electrical equipment, water pipes, gas pipes, etc. installed in the vicinity where the connection of the outlet is normal. Since the potential of metal underground objects also rises at the same time, there is a risk of causing malfunctions, failures, electric shocks, fire accidents, and the like.

  As an example of an inspection device for inspecting the reverse connection between the neutral electrode N and the grounding wire electrode E, there is an outlet tester described in Patent Document 1 and an outlet polarity check device described in Patent Document 2.

  However, the outlet tester of Patent Document 1 is provided with a switch for each line corresponding to the three terminals of the outlet. First, all the switches are opened and the zero point is adjusted. Since the doors are opened and closed in order, not only is the operation troublesome, but the configuration is complicated and expensive.

  The polarity check device of Patent Document 2 is a method called an injection type in which different signals are injected from the distribution board to the L pole, N pole, and E pole, and the signals are detected on the outlet side to discriminate each pole. Although it is highly reliable, it is expensive because it requires a parent device and a child device, and it requires two workers, so it cannot be said that the work efficiency is good.

JP-A-6-273467 JP 2006-38707 A

  Accordingly, an object of the present invention is to provide a simple configuration for determining whether or not there is a miswiring between the neutral electrode N and the grounding wire electrode E in, for example, an outlet with a grounding electrode having the live wire electrode L, the neutral electrode N and the grounding wire electrode E. However, it is to enable easy inspection.

  In order to solve the above-mentioned problem, the invention according to claim 1 is directed to the neutral wire and the ground wire in the indoor lead-in wiring including the live wire and the neutral wire of the commercial power line and the ground wire connected to the ground. In a wiring checker for inspecting the appropriateness of wiring connection, a first input terminal to be connected to the live wire, a second input terminal to be connected to the neutral line, and a third input to be connected to the ground line Three input terminals of the terminal and at least two resistance elements of first and second resistance elements connected in series, and the first resistance is between the first input terminal and the second input terminal. A resistor circuit in which an element is connected to the first input terminal side and the second resistor element is connected to the second input terminal side; voltage measuring means connected between both ends of the second resistor element; and the second input Either the terminal or the third input terminal Switch means for selectively connecting one of the input terminals to the low potential side of the second resistance element, and wiring connection between the neutral line and the ground line based on the measured voltage value measured by the voltage measuring means Determining means for determining the suitability of the switch, and the judging means determines the suitability of the wiring connection between the neutral line and the ground line based on the measured voltage value corresponding to the on / off of the switch means. It is characterized by.

  Moreover, the invention which concerns on Claim 2 is the suitability of the wiring connection of the said neutral wire and the said ground wire in the indoor lead-in wiring including the live wire and neutral wire of a commercial power source line, and the ground wire connected to the earth In the wiring checker for inspecting, the three inputs of the first input terminal to be connected to the live wire, the second input terminal to be connected to the neutral wire, and the third input terminal to be connected to the ground wire And at least two resistance elements, ie, a first resistance element and a second resistance element connected in series, and the first resistance element is connected between the first input terminal and the second input terminal. A resistor circuit connected on the input terminal side with the second resistor element connected on the second input terminal side, voltage measuring means connected across the second resistor element, and the third input terminal connected to the second input terminal Selective connection to the low potential side of the resistive element And determining means for determining the appropriateness of wiring connection between the neutral line and the ground line based on the measured voltage value measured by the voltage measuring means, and the determining means includes the switch means. When the measured voltage value does not change between when the switch means is turned on and when the switch means is turned off, it is determined that the wiring is normal, and when the switch means is turned on, when the switch means is turned off, the measured voltage is measured. When the value changes, it is characterized in that it is determined as an incorrect wiring.

  Moreover, the invention which concerns on Claim 3 is the suitability of the wiring connection of the said neutral line and the said ground line in the indoor lead-in wiring including the live wire and neutral line of a commercial power source line, and the ground wire connected to the earth In the wiring checker for inspecting, the three inputs of the first input terminal to be connected to the live wire, the second input terminal to be connected to the neutral wire, and the third input terminal to be connected to the ground wire And at least two resistance elements, ie, first and second resistance elements connected in series, and the first resistance element is connected to the first input terminal between the first input terminal and the third input terminal. A resistor circuit connected on the input terminal side with the second resistor element connected on the third input terminal side, voltage measuring means connected between both ends of the second resistor element, and the second input terminal connected to the second input terminal. Selective connection to the low potential side of the resistive element And determining means for determining the appropriateness of wiring connection between the neutral line and the ground line based on the measured voltage value measured by the voltage measuring means, and the determining means includes the switch means. When the measured voltage value changes between when the switch means is turned on and when the switch means is turned off, it is determined that the wiring is normal, and when the switch means is turned on, when the switch means is turned off, the measured voltage is measured. When the value does not change, it is characterized in that it is determined as an incorrect wiring.

  In addition, the invention according to claim 4 is suitable for wiring connection of the neutral line and the ground line in the indoor lead-in wiring including the live line and the neutral line of the commercial power line and the ground line connected to the ground. In the wiring checker for inspecting, the three inputs of the first input terminal to be connected to the live wire, the second input terminal to be connected to the neutral wire, and the third input terminal to be connected to the ground wire A first internal contact and a second internal contact to which the second input terminal is selectively connected via the terminal and the first switch means, and the third input terminal is selectively connected via the second switch means. A third internal contact and a fourth internal contact, and at least two resistance elements of a first and a second resistance element connected in series, and between the first input terminal and the first internal contact The first resistance element is connected to the first input. A resistance circuit in which the second resistance element is connected as the first internal contact side, a voltage measuring means connected between both ends of the second resistance element, and a measured voltage measured by the voltage measuring means Determining means for determining appropriateness of wiring connection between the neutral wire and the ground wire based on the value, wherein the second internal contact and the third internal contact are connected to the second resistance element via the third switch device. The fourth internal contact is connected to the low potential side of the second resistance element together with the first internal contact, and is connected to the low potential side, and the determination means includes the first and second switches. Means for turning on the third switch means in the first connection state in which the second input terminal is connected to the first internal contact and the third input terminal is connected to the third internal contact. When and off And the second input terminal is connected to the second internal contact by the first and second switch means, and the third input terminal is connected to the fourth internal contact. In the second connection state connected to the contact, when the measured voltage value changes between when the third switch means is turned on and when it is turned off, it is determined as normal wiring, In the first connection state, the measured voltage value changes between when the third switch means is turned on and when the third switch means is turned off, and in the second connection state, the third switch If the measured voltage value does not change between when the means is turned on and when the means is turned off, it is determined that the wiring is incorrect.

  Moreover, the invention which concerns on Claim 5 is the suitability of the wiring connection of the said neutral wire and the said ground wire in the indoor lead-in wiring including the live wire and neutral wire of a commercial power source line, and the ground wire connected to the earth In the wiring checker for inspecting, the three inputs of the first input terminal to be connected to the live wire, the second input terminal to be connected to the neutral wire, and the third input terminal to be connected to the ground wire A terminal, an internal contact to which either the second input terminal or the third input terminal is connected via a switch means, and at least two resistance elements of first and second resistance elements connected in series. And a resistor circuit connected between the first input terminal and the internal contact, the first resistance element being the first input terminal side and the second resistance element being the internal contact side, and the second Connected across the resistance element Voltage measuring means, and determining means for determining the appropriateness of the wiring connection between the neutral line and the ground line based on the measured voltage value measured by the voltage measuring means, the determining means comprising the switch Va> Vb, where Va is the voltage value when the second input terminal is connected to the internal contact by means, and Vb is the voltage value when the third input terminal is connected to the internal contact by the switch means. In this case, it is determined that the wiring is normal, and when Va <Vb, it is determined that the wiring is incorrect.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the first resistive element and the second resistive element included in the resistive circuit are relatively high in resistance to the first resistive element. An element is characterized in that the second resistance element is a low resistance element.

  According to a seventh aspect of the present invention, in the fourth aspect, the first switch means and the second switch means are interlocking switches, and the second input terminal is connected to the first internal contact as described above. A third input terminal is connected to the third internal contact, and the third input terminal is connected to the fourth internal contact as the second input terminal is connected to the second internal contact. It is said.

  In the present invention, as described in claim 8, the wiring object to be inspected is wiring in an outlet with a grounding electrode to which the live wire, neutral wire and ground wire are connected, and the first to first A mode in which a plug blade inserted into the outlet is used as the three input terminals is also included.

  Further, according to the present invention, as described in claim 9, the wiring object to be inspected is a distribution board to which the lead-in wires of the live electric wire, the neutral wire, and the ground wire are connected. A mode in which a test probe or a contact terminal of a test clip that comes into contact with the wiring in the distribution board is used as the third input terminal is also included.

  The basic components required for the present invention are a resistance circuit having at least two resistance elements connected in series, and a voltage across the resistance element connected to the neutral side of the resistance circuit is measured. Since the voltage measuring means (voltmeter) and the switch means to be used are both inexpensive and easily available, it is possible to provide an inexpensive wiring checker with a simple configuration suitable for an outlet with a ground electrode.

  According to the first, second, third, and fifth aspects of the present invention, the neutral electrode N and the ground wire electrode E are reversely connected (erroneous wiring) by simply switching the switch twice and measuring only two voltage values. ) Can be easily inspected.

  On the other hand, according to the invention according to claim 4, the switch is switched four times and four kinds of voltage values are measured, but the reverse connection state of the neutral electrode N and the grounding wire electrode E inside the checker. Therefore, higher reliability can be obtained.

The schematic diagram which shows each test state concerning 1st Embodiment of this invention at the time of (a) normal wiring and (b) reverse connection wiring. The circuit diagram which shows the modification of the said 1st Embodiment. The schematic diagram which shows each test | inspection state concerning 2nd Embodiment of this invention at the time of (a) normal wiring and (b) reverse connection wiring. The schematic diagram which shows each inspection state in (a) normal wiring and (b) reverse connection wiring concerning 3rd Embodiment of this invention. (A) A schematic diagram showing a normal wiring state of an outlet with a grounding electrode according to an extension rule, (b) a schematic diagram showing an indoor wiring state, and (c) a schematic diagram showing a reverse connection wiring state.

  Next, although each embodiment of the present invention will be described with reference to FIGS. 1 to 4, the present invention is not limited to these embodiments.

  In each of the embodiments, the inspection object is grounded by the live electrode L and the B-type grounded neutral pole N connected to the secondary side of the pole transformer TR described in FIG. 5 and the D-type ground. An outlet 1 with a grounding electrode having three terminals of a grounding wire electrode E to be connected. For convenience of explanation, a B-type grounding resistance, a D-type grounding resistance, and a ground resistance therebetween are added together, and the resistance value is obtained. RE. The ground resistance RE is about 10 to 500Ω.

  First, a wiring checker 10A according to the first embodiment of the present invention will be described with reference to FIG.

  The wiring checker 10A according to the first embodiment includes a voltage side plug blade 11 as a first input terminal to be connected to the live wire electrode L and a neutral as a second input terminal to be connected to the neutral electrode N. Three plug blades 11, 21, 31 of a ground wire plug blade 31 as a third input terminal to be connected to the electrode plug blade 21 and the ground wire electrode E are provided.

  Among these, between the voltage side plug blade 11 and the neutral electrode plug blade 21, there is a resistance circuit 40 formed by connecting at least two resistance elements, preferably a high resistance element RH and a low resistance element RL in series. It is connected.

  In this case, the high resistance element RH is connected to the voltage side plug blade 11 side, and the low resistance element RL is connected to the neutral electrode plug blade 12 side. As an example, the resistance value of the high resistance element RH is preferably in the order of MΩ, and the resistance value of the low resistance element RL is preferably in the order of kΩ.

  The ground wire plug blade 31 is connected to the low potential side of the low resistance element RL included in the resistance circuit 40 via the switch SW1. As the switch SW1, either a mechanical switch or an electronic switch may be employed. As will be described later, the switch SW1 is turned on and off when determining the connection state of the wiring, and is therefore a determination switch.

  A voltmeter 50 as voltage measuring means is connected to both ends of the low resistance element RL of the resistance circuit 40. The voltage measured by the voltmeter 50 is given to the determination circuit 60. Based on the measured voltage, the determination circuit 60 determines whether the wiring to the neutral electrode N and the grounding wire electrode E is normal (the neutral electrode N is B-type grounding and the grounding wire electrode E is D-type grounding). It is determined whether or not reverse connection (neutral pole N is D-type grounding and grounding wire pole E is B-type grounding), and the determination result is notified to the operator by the notification means 61. Note that the measured voltage may be converted into direct current by the voltmeter 50.

  The determination circuit 60 may be either a digital determination circuit such as a CPU or a microcomputer, or an analog determination circuit having a comparator. In the case of a digital determination circuit, an A / D converter is provided at its input stage. I need. The notification means 61 may be a lamp, a buzzer, a display panel, or the like.

  Next, the operation of the wiring checker 10A according to the first embodiment will be described. In the following description, the high resistance element RH and the low resistance element RL may be simply referred to as “resistance elements RH, RL”.

  After inserting the plug blades 11, 21, 31 into the live wire electrode L, neutral electrode N, and ground wire electrode E of the outlet 1, the switch SW 1 is turned on to connect the ground wire plug blade 31 to the resistance element RL. In this state, the voltage across the resistance element RL is measured by the voltmeter 50. The measured voltage is Von.

  Next, the switch SW <b> 1 is turned off, and the voltage across the resistor element RL is measured by the voltmeter 50. The measured voltage is Voff. Note that the switch SW1 may be turned on and off in any order, and may be turned off to on.

  The determination circuit 60 compares Von and Voff. Here, as shown in FIG. 1A, when the neutral electrode N and the ground wire electrode E are normally connected, the value of the voltmeter 50 does not change even if the switch SW1 is turned on / off.

  Therefore, if Von = Voff (or Von≈Voff) as a result of comparing Von and Voff, the determination circuit 60 notifies the operator that the wiring is normal.

  On the other hand, as shown in FIG. 1B, when the neutral electrode N and the ground wire electrode E are connected in reverse, the value of the voltmeter 50 is normal when the switch SW1 is turned on. However, when the switch SW1 is turned off, the measured voltage is divided by RL and RE, so that the measured voltage Voff at the voltmeter 50 is lower than that at normal wiring. It becomes.

  Therefore, if Von> Voff as a result of comparing Von and Voff, the determination circuit 60 notifies the operator that the wiring is incorrect by the notification unit 61.

  In the case of the incorrect wiring shown in FIG. 1B, the leakage breaker 3 (see FIG. 5B) may operate when the switch SW1 is turned off. However, the resistor circuit 40 includes the high resistance element RH. Therefore, the leakage current can be kept small.

  Next, a modification of the first embodiment will be described with reference to FIG. In this modification, unlike the first embodiment, the ground wire plug blade 31 is always connected to the low potential side of the resistance element RL, and the neutral electrode plug blade 21 is connected to the low potential of the resistance element RL via the switch SW1. Selectively connected to the side.

  The determination by the determination circuit 60 is also opposite to the first embodiment, and Von and Voff are compared. If Von> Voff, the normal wiring is determined, and if Von = Voff (or Von≈Voff), it is determined that the wiring is incorrect.

  Next, a wiring checker 10B according to a second embodiment of the present invention will be described with reference to FIG.

  In addition to the configuration of the wiring checker 10A according to the first embodiment, the wiring checker 10B according to the second embodiment further increases the reliability (determination accuracy) of the determination, in addition to the configuration of the wiring checker 10A according to the first embodiment. Is further provided with a switching circuit for reversely connecting and.

  That is, for each plug blade of the neutral electrode plug blade 21 and the ground wire plug blade 31, internal contacts 21a and 21b, internal contacts 31a and 31b, and switches SW2a and SW2b are prepared. 21 is selectively connected to one of the internal contacts 21a and 21b by the switch SW2a, and the ground wire plug blade 31 is selectively connected to one of the internal contacts 31a and 31b by the switch SW2b. Yes.

  Of each internal contact, the internal contact 21a and the internal contact 31b are both connected to the low potential side of the low resistance element RL.

  The internal contact 31a is connected to the low potential side of the low resistance element RL via the determination switch SW1, and the internal contact 21b is connected to the internal contact 31a, and the determination switch SW1 together with the internal contact 31a. Is connected to the low potential side of the low resistance element RL.

  In the second embodiment, the switches SW2a and SW2b are preferably interlocking switches, and the neutral electrode plug blade 21 and the ground wire plug blade 31 are both connected to the internal contact 21a and the internal contact 31a or the internal contact 21b and the internal contact. Switch to either one of 31b. For this reason, the switches SW2a and SW2b may be collectively referred to as the switch SW2.

  Next, the operation of the wiring checker 10B according to the second embodiment will be described. When the neutral electrode N and the grounding wire electrode E are normally connected as shown in FIG. It works as follows.

  First, when the switch SW1 for determination is turned on and off in a state where the neutral electrode plug blade 21 and the ground wire plug blade 31 are both connected to the internal contact 21a and the internal contact 31a by the switch SW2, the above-described FIG. As described in a), the value Von of the voltmeter 50 when turned on and the value Voff of the voltmeter 50 when turned off are Von = Voff (or Von≈Voff).

  Subsequently, the neutral electrode plug blade 21 and the ground wire plug blade 31 are both connected to the internal contact 21b and the internal contact 31b by the switch SW2. In this connection state, the neutral electrode N and the grounding wire electrode E are connected in reverse, as described with reference to FIG. Therefore, when the determination switch SW1 is turned on / off, Von> Voff.

  In this manner, when the switch SW2 is used to connect the neutral electrode blade 21 and the ground wire plug blade 31 to the internal contact 21a and the internal contact 31a, and the determination switch SW1 is turned on, Von = Voff (or Von ≈ Voff), and when the neutral electrode plug blade 21 and the ground wire plug blade 31 are both connected to the internal contact 21b and the internal contact 31b by the switch SW2, and the determination switch SW1 is turned off, Von> If Voff, the determination circuit 60 determines that the neutral electrode N and the ground wire electrode E are normally connected.

  On the other hand, as shown in FIG. 3B, when the neutral electrode N and the ground wire electrode E are misplaced, the neutral electrode plug blade 21 and the ground wire plug blade 31 are switched by the switch SW2. Are connected to the internal contact 21a and the internal contact 31a, and the determination switch SW1 is turned on and off, as described in FIG. 1B, when the switch SW1 is turned on, Von> When the switch SW1 is turned off, Von = Voff (or Von≈Voff).

  In this way, when the neutral electrode plug blade 21 and the ground wire plug blade 31 are both connected to the internal contact 21a and the internal contact 31a by the switch SW2, and the determination switch SW1 is turned on, Von> Voff and When the neutral electrode plug blade 21 and the ground wire plug blade 31 are both connected to the internal contact 21b and the internal contact 31b by the switch SW2 and the determination switch SW1 is turned off, Von = Voff (or Von≈Voff ), The determination circuit 60 determines that the neutral electrode N and the ground wire electrode E are reversely connected.

  In summary, when the switch SW1 is turned on and off while the switch SW2 (SW2a, SW2b) is switched between the internal contact 21a and the internal contact 31a, Von = Voff (or Von≈Voff) and the switch SW2 Is switched to the internal contact 21b and the internal contact 31b, and when the switch SW1 is turned on and off, if Von> Voff, the wiring is determined to be normal.

  On the other hand, when the switch SW1 is turned on and off while the switch SW2 (SW2a, SW2b) is switched between the internal contact 21a and the internal contact 31a, Von> Voff and the switch SW2 is set to the internal contact 21b. When the switch SW1 is turned on and off in the state of switching to the internal contact 31b, if Von = Voff (or Von≈Voff), it is determined that the wiring is incorrect.

  In order to perform this automatically, the determination circuit 60 controls the switch SW1 and the switch SW2 (SW2a, SW2b) as described above, and the determination circuit 60 has the determination patterns of Von and Voff at the time of switching. Just remember.

  Next, a wiring checker 10C according to a third embodiment of the present invention will be described with reference to FIG.

  The wiring checker 10C according to the third embodiment is obtained by simplifying the configuration of the wiring checker 10A according to the first embodiment. One end on the low potential side of the low resistance element RL of the resistance circuit 40 is used as the internal contact 41. The internal contact 41 is selectively switched to either one of the neutral electrode plug blade 21 and the ground wire plug blade 31 from the determination switch SW1a.

  As the operation, the measured voltage value of the voltmeter 50 when the switch SW1a is switched to the neutral electrode plug blade 21 side is Va, and the voltmeter 50 is measured when the switch SW1a is switched to the ground wire plug blade 31 side. Assuming that the voltage value is Vb, the determination circuit 60 compares Va and Vb.

  As shown in FIG. 4 (a), if the neutral electrode N and the grounding wire electrode E are normally connected, Va> Vb, and as shown in FIG. 4 (b), the neutral electrode N and the ground are connected. If the wiring of the line electrode E is wrong, Va <Vb is satisfied. Therefore, whether the wiring is normal or incorrect can be determined based on the magnitude relationship between Va and Vb.

  In each of the above embodiments, the object to be inspected is an outlet with a ground electrode. However, the wiring checker of the present invention can also inspect each lead-in wiring in the distribution board 2, and in that case, the voltage side plug Instead of the blade 11, the neutral electrode plug blade 21 and the ground wire plug blade 31, a contact terminal such as a test probe or a test clip may be used as each input terminal.

  Further, the wiring checker of the present invention may be configured as a single checker, but may be incorporated as one function in a multifunctional electrical measuring device.

DESCRIPTION OF SYMBOLS 1 Outlet with ground electrode 2 Distribution board 3 Earth leakage breaker 4 Centralized ground terminal 10A, 10B, 10C Wiring checker 11 Voltage side plug blade (first input terminal)
21 Neutral electrode plug blade (second input terminal)
31 Ground wire plug blade (3rd input terminal)
21a, 21b, 31a, 31b, 41 Internal contact 40 Resistance circuit 50 Voltmeter (voltage measuring means)
60 Judgment circuit 61 Notification means E Live wire pole N Neutral pole E Ground wire pole RH High resistance element RL Low resistance element RE Ground resistance SW1, SW1a Switch for judgment SW2 (SW2a, SW2b) Interlocking switch

Claims (9)

In a wiring checker for inspecting the appropriateness of the wiring connection between the neutral line and the ground line in the indoor lead-in wiring including the live line and the neutral line of the commercial power line and the ground line connected to the ground,
Three input terminals, a first input terminal to be connected to the live wire, a second input terminal to be connected to the neutral wire, and a third input terminal to be connected to the ground wire;
It has at least two resistance elements of a first resistance element and a second resistance element connected in series, and the first resistance element is connected to the first input terminal side between the first input terminal and the second input terminal. A resistor circuit in which the second resistor element is connected as the second input terminal side;
Voltage measuring means connected between both ends of the second resistance element;
Switch means for selectively connecting one of the second input terminal and the third input terminal to the low potential side of the second resistance element;
Determination means for determining the appropriateness of wiring connection between the neutral wire and the ground wire based on the measured voltage value measured by the voltage measuring device;
The determination unit determines whether or not the neutral line and the ground line are properly connected based on the measured voltage value corresponding to whether the switch unit is turned on or off. In a wiring checker for inspecting the appropriateness of the wiring connection between the neutral line and the ground line in the indoor lead-in wiring including the live line and the neutral line of the commercial power line and the ground line connected to the ground,
Three input terminals, a first input terminal to be connected to the live wire, a second input terminal to be connected to the neutral wire, and a third input terminal to be connected to the ground wire;
It has at least two resistance elements of a first resistance element and a second resistance element connected in series, and the first resistance element is connected to the first input terminal side between the first input terminal and the second input terminal. A resistor circuit in which the second resistor element is connected as the second input terminal side;
Voltage measuring means connected between both ends of the second resistance element;
Switch means for selectively connecting the third input terminal to the low potential side of the second resistance element;
Determination means for determining the appropriateness of wiring connection between the neutral wire and the ground wire based on the measured voltage value measured by the voltage measuring device;
The determination means determines that the wiring is normal when the measured voltage value does not change between when the switch means is turned on and when the switch means is turned off, and when the switch means is turned on, A wiring checker characterized in that when the measured voltage value changes between when it is turned off, it is determined that the wiring is incorrect. In a wiring checker for inspecting the appropriateness of the wiring connection between the neutral line and the ground line in the indoor lead-in wiring including the live line and the neutral line of the commercial power line and the ground line connected to the ground,
Three input terminals, a first input terminal to be connected to the live wire, a second input terminal to be connected to the neutral wire, and a third input terminal to be connected to the ground wire;
It has at least two resistance elements of the first and second resistance elements connected in series, and the first resistance element is connected to the first input terminal side between the first input terminal and the third input terminal. A resistance circuit in which the second resistance element is connected as the third input terminal side;
Voltage measuring means connected between both ends of the second resistance element;
Switch means for selectively connecting the second input terminal to the low potential side of the second resistance element;
Determination means for determining the appropriateness of wiring connection between the neutral wire and the ground wire based on the measured voltage value measured by the voltage measuring device;
The determination means determines normal wiring when the measured voltage value changes when the switch means is turned on and when the switch means is turned off, and when the switch means is turned on, A wiring checker characterized in that when the measured voltage value does not change between when it is turned off, it is determined as an incorrect wiring. In a wiring checker for inspecting the appropriateness of the wiring connection between the neutral line and the ground line in the indoor lead-in wiring including the live line and the neutral line of the commercial power line and the ground line connected to the ground,
Three input terminals, a first input terminal to be connected to the live wire, a second input terminal to be connected to the neutral wire, and a third input terminal to be connected to the ground wire;
A first internal contact and a second internal contact selectively connected to the second input terminal via the first switch means, and a third internal contact selectively connected to the third input terminal via the second switch means. 3 internal contacts and a fourth internal contact;
It has at least two resistance elements of the first and second resistance elements connected in series, and the first resistance element is connected to the first input terminal side between the first input terminal and the first internal contact. A resistance circuit in which the second resistance element is connected as the first internal contact side;
Voltage measuring means connected between both ends of the second resistance element;
Determination means for determining the appropriateness of wiring connection between the neutral wire and the ground wire based on the measured voltage value measured by the voltage measuring device;
The second internal contact and the third internal contact are connected to the low potential side of the second resistive element via third switch means, and the fourth internal contact is connected to the second resistor together with the first internal contact. Connected to the low potential side of the element,
The determination means includes a first switch in which the second input terminal is connected to the first internal contact and the third input terminal is connected to the third internal contact by the first and second switch means. In the connected state, the measured voltage value does not change between when the third switch means is turned on and when the third switch means is turned off, and the two input terminals are connected by the first and second switch means. In the second connection state in which the third input terminal is connected to the second internal contact and the third input terminal is connected to the fourth internal contact, when the third switch means is turned on and when the third switch is turned off, If the measured voltage value changes, it is determined as normal wiring,
On the other hand, in the first connection state, the measured voltage value changes between when the third switch means is turned on and when the third switch means is turned off, and in the second connection state, A wiring checker characterized in that an erroneous wiring is determined when the measured voltage value does not change between when the third switch means is turned on and when it is turned off. In a wiring checker for inspecting the appropriateness of the wiring connection between the neutral line and the ground line in the indoor lead-in wiring including the live line and the neutral line of the commercial power line and the ground line connected to the ground,
Three input terminals, a first input terminal to be connected to the live wire, a second input terminal to be connected to the neutral wire, and a third input terminal to be connected to the ground wire;
An internal contact to which either the second input terminal or the third input terminal is connected via a switch means;
It has at least two resistance elements of the first and second resistance elements connected in series, and the first resistance element is the first input terminal side between the first input terminal and the internal contact. A resistance circuit connected with the second resistance element as the internal contact side;
Voltage measuring means connected between both ends of the second resistance element;
Determination means for determining the appropriateness of wiring connection between the neutral wire and the ground wire based on the measured voltage value measured by the voltage measuring device;
The determination means has a voltage value Va when the second input terminal is connected to the internal contact by the switch means, and a voltage value when the third input terminal is connected to the internal contact by the switch means. Is a wiring checker that determines that the wiring is normal when Va> Vb, and determines that the wiring is incorrect when Va <Vb.   The first resistance element and the second resistance element included in the resistance circuit are characterized in that the first resistance element is a high resistance element and the second resistance element is a low resistance element. Item 6. The wiring checker according to any one of Items 1 to 5.   The first switch means and the second switch means are interlocking switches, and the third input terminal is connected to the third internal contact as the second input terminal is connected to the first internal contact. The wiring checker according to claim 4, wherein the third input terminal is connected to the fourth internal contact as the second input terminal is connected to the second internal contact.   The wiring object to be inspected is the wiring in the outlet with the grounding electrode to which the live wire, neutral wire and grounding wire are connected, and the plug blade inserted into the outlet is used as the first to third input terminals. The wiring checker according to any one of claims 1 to 7, wherein:   The distribution object to be inspected is a distribution board to which the lead wires of the live wires, neutral wires, and ground wires are connected, and the first to third input terminals are in contact with the wires in the distribution board. 8. The wiring checker according to claim 1, wherein a contact terminal of a probe or a test clip is used.

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