JP2008140554A - Tool for faulty connection prevention - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool for prevention of faulty connection which achieves a purpose of preventing faulty connection to a connection terminal of a wiring, and which is equipped with a cap part capable of secure connection even if there is nothing to play a role of a stopper in a terminal of the wiring and even if a diameter of the wiring has various dimensions. <P>SOLUTION: The tool 1 for prevention of faulty connection is constituted of the cap part 2 having an insertion port 23 into which the wirings 18 to 20 are inserted, a terminal part 3 for insertion to be inserted into connection holes of the terminals 12 to 14 and a wire member 4 communicating the cap part 2 and the terminal part 3 for insertion. At least the cap part 2 and the wire member 4 are formed by a material having insulation. The cap part 2 has a retaining structure of pressing and pinching a side face of the wirings 18 to 20 inserted from the insertion part 23 in its inner side face. The retaining structure has elasticity and is constituted by combining a first tapering site 28 and a second tapering site 29, and presses and pinches the wirings 18 to 20 by the site of narrower inner diameter than a diameter dimension of the wirings of the first tapering site 28 and the second tapering site 29. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  For example, when a terminal such as a watt hour meter or an instrument such as a lead-in branch terminal box is connected to a terminal of wiring, the present invention is re-established when recovering from a disconnected state where electricity is temporarily stopped. The present invention relates to an instrument for preventing an erroneous connection to a terminal of a wiring due to an erroneous selection of a connection destination.

  As shown in Patent Document 1, for example, this type of watt hour meter has power supply side and load side wirings connected to wiring connection holes of terminal fittings arranged in parallel on the lower surface of the main body. Usually used. When the power contract is abolished and the power supply is stopped, conventionally, for example, in the case of a power contract (single-phase three-wire type) in the watt-hour meter 100, as shown in FIG. In the case where the two wires 101 and 103 except the ground side wires are removed from the terminals 104 to 106 among the three wires 101 to 103 on the side, and a low power contract (three-phase three-wire type) of the watt-hour meter 100 is involved. As shown in FIG. 9, the operation of removing all the three wirings 101, 102, 103 on the power source side from the terminals 104 to 106 is performed. On the other hand, in the case of reuse, a recovery operation is performed in which the removed wirings 101 and 103 or all of the wirings 101 to 103 are appropriately reconnected to the terminals 104 to 106. An insulating cap 107 is attached to the end of each of the removed wirings 101 and 103 or the wirings 101 to 103.

  When performing this restoration work, for the purpose of preventing incorrect connections such as incorrect selection of the connection holes of the wiring terminals, it is necessary to attach color tapes for the display of the wiring colors and to cover the terminal terminals of the instrument, etc. In the past, contrivances such as writing the color of the wiring to be reconnected to have been made, but none of them can be said to be a measure for preventing the erroneous connection of the wiring reliably. In addition, when reconnecting the wires, even if each wire is displayed by color, depending on the length of the wires, it may not be clear which terminal of the meter should be connected.

In this regard, the terminal misconnection prevention tool disclosed in Patent Document 2 includes a non-conductive string material, an insulating cap attached to one end of the string material, and a terminal block provided at the other end of the string material. When temporarily removing wiring during circuit testing, periodic inspection, etc., insert the terminal of the removed wiring into the opening of the insulating cap, and connect the connection to the terminal block wiring. When connecting to the connection section and completing the desired work, when the wiring is restored to the original connection position of the terminal block, the wrong connection can be reliably prevented by going through the reverse procedure of the previous work. I can do it. Here, the connection part constituting the terminal misconnection prevention tool shown in Patent Document 2 has a substantially U shape with a bifurcated tip, and includes a screw-like terminal head and a terminal block body. This connection portion is inserted between the two.
JP 2003-75470 A JP 2000-173692 A

  However, in Patent Document 2, when the wiring terminal is inserted into the insulating cap, the insulating cap is deformed by elasticity and the terminal is moved by the elastic force due to this deformation. If it is firmly held, the shape of the circular terminal itself plays the role of a stopper, and if the terminal of the wiring does not have this terminal and the terminal of the wiring is only a linear shape without undulations, The end of the wiring cannot be securely held by the structure of the insulating cap. Also, since the diameter dimension of the wiring connected to the connection terminal is not uniform, if the insulating cap is inseparably integrated with other parts of the terminal misconnection prevention tool, In addition, there is a problem in that it is necessary to prepare an erroneous connection prevention tool for a plurality of terminals having different inner diameters at the insertion port of the insulating cap.

  Therefore, the present invention achieves the intended purpose of preventing erroneous connection to the terminals of the wiring at the time of restoration work, and does not serve as a stopper at the end of the wiring, and the diameter of the wiring is diverse. An object of the present invention is to provide an erroneous connection preventing device having a cap portion that can be reliably connected even if the dimensions are small.

  The erroneous connection preventing instrument according to the present invention connects a cap portion having an insertion port into which wiring is inserted, an insertion terminal portion inserted into a connection hole of a terminal, and the cap portion and the insertion terminal portion. The cap part and the linear member are made of an insulating material, and the cap part is formed on the inner surface of the wiring inserted from the insertion port. It has the holding structure which presses a side surface (Claim 1). Note that the insertion terminal portion may also be formed of an insulating material. Moreover, the cap part and the linear member are integrally formed. Further, the linear member has a predetermined hardness, the inside is not hollow, the shape is easily changed, and the shape after the change can be fixed.

As a result, the terminal of the wiring inserted and connected to the connection hole of the terminal is removed, and the terminal of this wiring is inserted and connected from the insertion port of the cap part of the erroneous connection prevention instrument, and the erroneous connection prevention instrument is inserted. When the terminal part is inserted and connected to the terminal connection hole, at least from the cap part to the linear member, since it has non-conductivity, electricity is interrupted, and the terminal of the wiring is simply removed from the terminal connection hole and The same is true. And, when performing the restoration work of inserting the terminal of the wiring into the connection hole of the terminal, remove the terminal of the wiring from the insertion port of the cap part of the erroneous connection prevention instrument and remove the terminal part for insertion of the erroneous connection prevention instrument. By performing the operation of removing the terminal connection hole from the terminal and inserting and connecting the terminal of the wiring into the terminal connection hole for each wiring individually, erroneous connection of the wiring is reliably prevented. Furthermore, even if there is a dimensional difference within a predetermined range in the diameter of the wiring, the side surface of the wiring inserted from the insertion port can be pressed and clamped by the holding structure, so the cap portion is integrated with the linear member. Even so, it is not necessary to prepare a plurality of erroneous connection prevention devices according to wirings having different diameters. The predetermined range of the wire diameter is, for example, a range from 1.6 mm to 60 mm ² .

  The holding structure has elasticity, and is formed by combining a plurality of tapered portions whose inner diameters on the far side end rather than the insertion port side are temporarily reduced (Claim 2). In addition, the holding structure has elasticity, and a tapered portion in which a linear portion having an inner diameter smaller than the diameter of an insertion terminal portion for various wirings and an inner diameter on the back end rather than the insertion port side are temporarily reduced. It is a combination of parts (claim 3). The number of these tapered portions and linear portions is not limited, and the configuration of only the tapered portions or a combination of a plurality of linear portions and a plurality of tapered portions may be used. As a result, when the end of the wiring having a diameter within the predetermined range is inserted into the cap portion from the insertion port, the end of the wiring has a linear portion narrower than the diameter or a portion narrower than the diameter. It is securely held by being pinched by the tapered portion, and does not fall out from the insertion port of the cap part naturally.

  As described above, according to these inventions, the terminal of the wiring inserted and connected to the connection hole of the terminal is removed, and the terminal of this wiring is connected to the insertion port of the cap part of the erroneous connection preventing instrument and By inserting and connecting the insertion terminal portion of the connection prevention instrument into the terminal connection hole, at least from the cap portion to the linear member, non-conductivity is provided so that electricity is not passed, and the terminal of the wiring is simply connected to the terminal connection hole. In the recovery work, when inserting the terminal of the wiring into the terminal connection hole, remove the terminal of the wiring from the insertion port of the cap part of the erroneous connection prevention tool to prevent erroneous connection. It is possible to reliably prevent misconnection of wiring by performing the operation of removing the terminal portion for insertion of the instrument from the terminal connection hole and inserting and connecting the terminal of the wiring into the terminal connection hole for each individual wiring. so That.

  And about the wiring, if the diameter dimensions of the insertion terminal portion are various, but within a predetermined range, the side surface of the wiring inserted from the insertion port is tapered and the inner surface of the raised portion forming a linear portion Therefore, even if the cap part is inseparable from other parts of the wrong connection prevention device, multiple wrong connection prevention devices are prepared according to the wiring of different diameters. Therefore, it is possible to reduce the manufacturing cost of the erroneous connection prevention device. There is no need to devise such as attaching color-specific tapes or entering the color of the wiring to be reconnected to the instrument terminal cover or the like to display the wiring by color.

  Furthermore, according to these inventions, insulation measurement is possible without removing the grounding wiring when the electric energy meter according to the electric power contract (single-phase three-wire system) is re-used after the contract is abolished and the supply is stopped. Can do.

  Embodiments of the present invention will be described below with reference to the drawings.

  As an example of a device in which the erroneous connection preventing instrument 1 according to the present invention is used, the watt hour meter 5 is shown in a state where the lid is removed from the outdoor instrument box 6 and the instrument terminal cover is further removed. This watt-hour meter 5 is housed in a transparent case 7.

  And the terminal block 8 is arranged in the lower part of the watt-hour meter 5 and outside the case 7, and this terminal block 8 has six terminals 9 to 14, corresponding to a three-phase three-wire system. It is a thing. Of course, the erroneous connection preventing device 1 according to the present invention can be used for single-phase two-wire, single-phase three-wire, and three-phase four-wire types. The inside of the terminal block 8, that is, the terminals 9 to 14, is usually covered with the above-described instrument terminal cover and cannot be visually observed.

  The terminal 9 is connected to the terminal of the wiring 15 that is one of the power supply side wirings, the terminal 10 is connected to the terminal of the grounding wiring 16 that is one of the power supply side wirings, and the terminal 11 is the power supply side wiring. One wiring 17 is connected to the terminal. The terminals of the wirings 15 to 17 inserted in the connection holes of the terminals 9 to 11 are held by the fasteners 21 and 22. These terminals 9 to 11 and the terminals of the wirings 15 to 17 are normally connected unless the meter-side main body of the watt-hour meter 5 is removed, and are not removed.

On the other hand, in the normal state, the terminal 12 is connected to the terminal of the wiring 18 that is one of the load-side wirings, and the terminal 13 is connected to the terminal of the ground-side wiring 19 that is one of the load-side wirings. 14 is connected to the terminal of the wiring 20 which is one of the load side wirings, and the terminals of the wirings 18 to 20 inserted in the connection holes of the terminals 12 to 14 are held by the fasteners 21 and 22. On the other hand,
When the power contract is abolished and the power supply is stopped, the terminals of the wirings 18 to 20 are removed from all of the terminals 12 to 14 because of the three-phase three-wire system.

  And when the terminal of the wiring 18 thru | or 20 is removed from the terminals 12 thru | or 14, the incorrect connection prevention instrument 1 shown by FIG.2 and FIG.3 is interposed. The erroneous connection preventing instrument 1 includes a cap portion 2, an insertion terminal portion 3, and a linear member 4 that connects the cap portion 2 and the insertion terminal portion 3 to each other. The insertion terminal 3 and the linear member 4 are made of an insulating material. However, the material of the insertion terminal portion 3 is not limited to an insulating material as long as it is possible to avoid energization from the wiring to the terminal.

  Of these, the insertion terminal portion 3 is to be attached to the connection holes of the terminals 12 to 14, and the diameter of the insertion terminal portion 3 only needs to be smaller than that of the smallest diameter of the connection holes of this type of terminal. Even if a gap is generated because it is smaller than the size, it can be dealt with by adjusting the fasteners 21 and 22 made of bolts or the like.

  The linear member 4 has, for example, a circular cross section having the same diameter as that of the terminal portion 3 for insertion, is integrated with the cap portion 2 described below, has a certain degree of hardness, and at the same time, FIG. As shown in FIG. 5, the shape is easily changed, and the deformed shape can be maintained as it is.

  The cap portion 2 has, for example, a substantially bell shape, and has a bottom and a hole extending along the longitudinal direction of the cap portion 2 on the side opposite to the side connected to the linear member 4 as shown in FIG. The insertion port 23 is opened. In this embodiment, the cap portion 2 has a longitudinal dimension L1 from the side end of the insertion port 23 to the boundary with the linear member 4 of 6.0 cm, and an outer shape along the short side of the side end of the insertion port 23. The dimension L2 is 2.5 cm.

  In this embodiment, the cap portion 2 has four substantially thin plate-like raised portions 24 to 27 as a structure for holding the wirings 18 to 20 in the cap portion 2. The cap part 2 is erected from the inner peripheral surface of the cap part 2 so that the raised part 25 and the raised part 27 face each other. The raised portions 24 to 27 have elasticity capable of expanding and contracting or buckling along a radial line extending outward from the radial center point of the cap portion 2.

  As a first example of the holding structure, each of the raised portions 24 to 27 is at the same position as the inner peripheral surface of the cap portion 2 at the end of the insertion port 23 as shown in FIG. By increasing the width of the ridge for a while as it goes to the linear member 4 side, when viewed as a space between the ridges facing each other (for example, between the ridges 24 and 26), from the insertion port 23 side Also, a substantially tapered first tapered portion 28 is defined in which the inner diameter dimension toward the back end is reduced for a while. And each bulge part 24 thru | or 27 is an increase rate different from the increase rate of the protrusion width | variety in the said 1st taper site | part 28 from the terminal end of the 1st taper site | part 28, as FIG.3 (b) shows. When it is viewed as a space between the raised portions facing each other (for example, between the raised portion 24 and the raised portion 26) by increasing the raised width for a while as it proceeds to the linear member 4 side, the insertion port 23 side A substantially tapered second tapered portion 29 is defined in which the inner diameter dimension toward the far end is temporarily reduced.

  Accordingly, even when wirings having different diameters are mounted from the insertion port 23 of the cap portion 2 to the inside, they can be reliably held. That is, the wiring having a relatively small diameter is inserted to reach the second tapered portion 29, so that the raised portion 24 and the raised portion 26, and the raised portion 25 and the raised portion that form the inner surface of the second tapered portion 29 are formed. The portion 27 contracts or buckles toward the outer peripheral side of the cap portion 2, but the wiring is pressed and clamped toward the center of the cap portion 2 by a repulsive force, so that it is held in the cap portion 2. A wiring having a relatively large diameter is inserted into the first tapered portion 28, so that the raised portion 24 and the raised portion 26, and the raised portion 25 and the raised portion 27 that form the inner surface of the first tapered portion 28 are as follows. The wire is contracted or buckled toward the outer peripheral side of the cap part 2, but the wiring is pressed and sandwiched toward the center direction of the cap part 2 by the repulsive force, so that it is held in the cap part 2.

  FIG. 4 shows a second example as a wiring holding structure. This wiring holding structure is the same as the holding structure of FIG. 3 as a combination of a plurality of tapered portions, but includes a first tapered portion 28, a second tapered portion 29, and a third tapered portion 30. This is different from the holding structure of FIG. In the following, the same components as those of the previous embodiment are denoted by the same reference numerals, the description thereof is omitted, and different components will be described.

  That is, as shown in FIG. 4B, each of the raised portions 24 to 27 has an increase rate different from the increase rate of the raised width at the second tapered portion 29 from the end of the second tapered portion 29. When it is viewed as a space between the raised portions facing each other (for example, between the raised portion 24 and the raised portion 26) by increasing the raised width for a while as it proceeds to the linear member 4 side, the insertion port 23 side A substantially tapered third tapered portion 30 is defined in which the inner diameter dimension toward the far end is temporarily reduced.

  Accordingly, even when wirings having different diameters are mounted from the insertion port 23 of the cap portion 2 to the inside, they can be reliably held. That is, the wiring having a relatively small diameter is inserted to reach the third tapered portion 30, so that the raised portion 24 and the raised portion 26 that form the inner surface of the third tapered portion 30, and the raised portion 25 and the raised portion are formed. The part 27 contracts or buckles toward the outer peripheral side of the cap part 2, but the wiring is pressed and clamped toward the center of the cap part 2 by the repulsive force, so that it is held in the cap part 2. The wiring having a relatively large diameter is inserted into the first tapered portion 28, so that the raised portion 24 and the raised portion 26, and the raised portion 25 and the raised portion 27 that form the inner surface of the first tapered portion 28 are formed. The cap portion 2 contracts or buckles toward the outer peripheral side, but is held by being pressed and sandwiched by the repulsive force toward the center of the cap portion 2. And the wiring of the diameter dimension which hits an intermediate | middle relatively is inserted to the 2nd taper part 29, and the protruding part 24 and the protruding part 26 which form the inner surface of the 2nd taper part 29, the protruding part 25, and the protruding part 27 is contracted or buckled toward the outer peripheral side of the cap part 2, but the wiring is pressed and clamped toward the center of the cap part 2 by a repulsive force, so that it is held in the cap part 2.

  5 and 6, the insertion port 23 has a structure in which a tapered portion and a linear portion are appropriately combined as a holding structure for holding the wirings 18 to 20 in the cap portion 2.

  Among these, as a third example of the holding structure shown in FIG. 5, each of the raised portions 24 to 27 is located at the same position as the inner peripheral surface of the cap portion 2 at the end of the insertion port 23, as shown in FIG. 5B. When it is viewed as a space between the ridges facing each other (for example, between the ridges 24 and 26) by increasing the ridge width for a while as it goes to the linear member 4 side, A substantially tapered first tapered portion 28 is defined in which the inner diameter dimension on the far side end rather than the insertion port 23 side is temporarily reduced. Further, as shown in FIG. 5B, the raised portions 24 to 27 face each other by extending from the end of the first tapered portion 28 with the same raised width along the axial direction of the insertion port 23. When viewed as a space between the raised portions (for example, between the raised portion 24 and the raised portion 26), a substantially rectangular first linear portion 31 is defined. The second to fifth linear portions 32, 33, 34, and 35 are also formed by the raised portions 24 to 27 in the same manner as the linear portion 31 as shown in FIG. 5B. Thus, when viewed as a space between the raised portions facing each other (for example, between the raised portion 24 and the raised portion 26), it has a substantially rectangular shape. The raised width of the second linear portion 32 is larger than the raised width of the first linear portion 31, the raised width of the third linear portion 33 is larger than the raised width of the second linear portion 32, The raised width of the fourth linear portion 34 is larger than the raised width of the third linear portion 33, and the raised width of the fifth linear portion 35 is larger than the raised width of the fourth linear portion 34. Thus, the first linear portion 31 to the fifth linear portion 35 are stepped with four steps.

  Accordingly, even when wirings having different diameters are mounted from the insertion port 23 of the cap portion 2 to the inside, they can be reliably held. That is, for example, in the case of a wiring having a diameter larger than the radial width of the first linear portion 31, the inner surface of the first linear portion 31 is inserted by reaching the first linear portion 31. The bulging part 24 and the bulging part 26, and the bulging part 25 and the bulging part 27 that form the wire contract or buckle toward the outer peripheral side of the cap part 2, but press the wiring toward the center of the cap part 2 by a repulsive force. , So that it is held in the cap portion 2. This is because the wiring having a diameter larger than the radial width than the second to fifth linear portions 32 to 35 is similarly inserted to reach the second to fifth linear portions 32 to 35. The same effect is maintained.

  As a fourth example of the holding structure shown in FIG. 6, the raised portions 24 to 27 are at the same position as the inner peripheral surface of the insertion port 23 at the end of the insertion port 23 as shown in FIG. 6B. When this is viewed as a space between the ridges facing each other (for example, between the ridges 24 and 26) by increasing the ridge width for a while as it goes to the linear member 4, the insertion port A substantially tapered first tapered portion 28 is defined in which the inner diameter dimension toward the far side end rather than the 23 side is temporarily reduced. Further, as shown in FIG. 6B, the raised portions 24 to 27 face each other by extending from the terminal end of the first tapered portion 28 with the same raised width along the axial direction of the insertion port 23. When viewed as a space between the raised portions (for example, between the raised portion 24 and the raised portion 26), a substantially rectangular first linear portion 31 is defined. Further, as shown in FIG. 6B, each of the raised portions 24 to 27 has an increase rate different from the increase rate of the raised width at the first tapered portion 28 from the end of the first linear portion 31. In the case where it is viewed as a space between the ridges facing each other (for example, between the ridges 24 and 26) by increasing the ridge width for a while as it goes to the linear member 4 side, the opening end side A substantially tapered second tapered portion 29 is defined in which the inner diameter dimension toward the far end is temporarily reduced.

  Accordingly, even when wirings having different diameters are mounted from the insertion port 23 of the cap portion 2 to the inside, they can be reliably held. That is, for example, in the case of a wiring having a diameter larger than the radial width of the first linear portion 31, the first linear portion 31 or the first linear portion 31 is inserted to reach the first linear portion 31. The raised portion 24 and the raised portion 26 that form the inner surface of the tapered portion 28 or the first linear portion 31, and the raised portion 25 and the raised portion 27 contract or buckle toward the outer peripheral side of the cap portion 2. Since the wiring is pressed and clamped toward the center of the cap part 2 by the repulsive force, it is held in the cap part 2. Further, for example, in the case of a wiring having a diameter smaller than the radial width of the first linear portion 31, a bulge that forms the inner surface of the second tapered portion 29 by being inserted to the second tapered portion 29. The portion 24 and the raised portion 26, and the raised portion 25 and the raised portion 27 contract or buckle toward the outer peripheral side of the cap portion 2, but the wiring is pressed and clamped toward the center direction of the cap portion 2 by the repulsive force. And held in the cap portion 2.

As described above, any of the erroneous connection prevention devices 1 can handle wires having a diameter within a predetermined range, such as a range of diameters from 1.6 mm to 60 mm ² , and the cap portion 2 has one end. When plugged in, the wiring does not fall out naturally.

  In addition, as an example of a device in which the erroneous connection preventing instrument 1 according to the present invention is used, the description has been made so far for the one relating to the low voltage power contract (three-phase three-wire type) of the watt-hour meter. It is not limited to. As shown in FIG. 7, for example, it is possible to use even when the different-phase lead-in branch terminal box 36 and the lead-in branch terminal box 47 are arranged close to each other. That is, the lead-in branch terminal box 36 has terminals 37, 38, 39, and 40 to which lead-in wires 42, 43, 44, and 45 are connected in addition to the terminals 41 that are connected to the pull-down branch electric wires 46. . On the other hand, the lead-in branch terminal box 47 has terminals 48, 49, 50, 51 to which lead-in wires 53, 54, 55, 56 are connected in addition to the terminals 52 connected to the pull-down branch wires 57. ing. In this case, in order to prevent the lead-in wires 42, 43, 44, 45 from being erroneously connected to the terminals 48, 49, 50, 51 of the lead-in branch box 47, and the lead-in wires 53, 54, 55, 56 are brought into the lead-in branch box. In order to prevent erroneous connection with the 36 terminals 37, 38, 39, and 40, it is possible to use the erroneous connection prevention instrument 1 according to the present invention.

FIG. 1 is a side view showing a schematic configuration of an erroneous connection preventing instrument according to the present invention. FIG. 2 is an explanatory view showing a state in which the above-mentioned erroneous contact prevention instrument is interposed between the terminal of the watt-hour meter and the terminal of the wiring. FIG. 3 shows the structure of the first example of the holding structure for holding the wiring in which the above-mentioned erroneous contact prevention device is mounted. FIG. 3A shows the holding structure as seen from the insertion port side. FIG. 3B is a cross-sectional view of the holding structure. FIG. 4 shows the structure of a second example of the holding structure for holding the wiring with the above-mentioned erroneous contact prevention device attached. FIG. 4 (a) shows the holding structure as seen from the insertion port side. FIG. 4B is a cross-sectional view of the holding structure. FIG. 5 shows the structure of a third example of the holding structure for holding the wiring in which the erroneous contact prevention device is mounted. FIG. 5 (a) shows the holding structure as seen from the insertion port side. FIG. 5B is a cross-sectional view of the holding structure. FIG. 6 shows the structure of a fourth example of the holding structure for holding the wiring in which the erroneous contact prevention device is mounted. FIG. 6 (a) shows the holding structure as viewed from the insertion port side. FIG. 6B is a cross-sectional view of the holding structure. FIG. 7 shows an example of another embodiment with respect to the embodiment of FIG. 2, showing two lead-in branch terminal boxes of different phases, and between the terminals of each lead-in branch terminal box and the terminal of the wiring. It is explanatory drawing which shows the state which interposed the tool for incorrect connection prevention same as the above. FIG. 8: is a prior art example figure which shows the state which removed the terminal of the wiring from the terminal in the case where it relates to an electric power contract (single-phase three-wire type) among watt-hour meters. FIG. 9: is a prior art example figure which shows the state which removed the terminal of the wiring from the terminal in the case where it concerns on a low electric power contract (three-phase three-wire type) among watt-hour meters.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Misconnection prevention instrument 2 Cap part 3 Insertion terminal part 4 Linear member 5 Low voltage gauge 6 Outdoor instrument box 8 Terminal block 9 Terminal 10 Terminal 11 Terminal 12 Terminal 13 Terminal 14 Terminal 15 Wiring 16 Ground side wiring 17 Wiring 18 Wiring 19 Ground-side wiring 20 Wiring 24 Raised portion 25 Raised portion 26 Raised portion 27 Raised portion 28 First tapered portion 29 Second tapered portion 30 Third tapered portion 31 First linear portion 32 Second linear shape Part 33 Third linear part 34 Fourth linear part 35 Fifth linear part 36, 47 Lead-in branch terminal box 37, 48 Terminal 38, 49 Terminal 39, 50 Terminal 40, 51 Terminal 41, 52 Terminal 42 , 53 Lead wire 43, 54 Lead wire 44, 55 Lead wire 45, 56 Lead wire 46, 57 Branching wire for pulling down

Claims (3)

It is composed of a cap portion having an insertion port into which the wiring is inserted, an insertion terminal portion inserted into the connection hole of the terminal, and a linear member connecting the cap portion and the insertion terminal portion.
At least the cap part and the linear member are formed of an insulating material, and the cap part has a holding structure that presses the side surface of the wiring inserted from the insertion port on the inner side surface thereof. A device for preventing erroneous connection. 2. The prevention of erroneous connection according to claim 1, wherein the holding structure has elasticity, and is formed by combining a plurality of tapered portions whose inner diameters on the far side end rather than the insertion port side are temporarily reduced. Appliances. The holding structure has elasticity, and a linear portion having an inner diameter smaller than the diameter of the terminal portion for insertion of various wirings, and a tapered portion in which the inner diameter of the back end is smaller than that of the insertion port for a while. The instrument for preventing erroneous connection according to claim 1, wherein:

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