JP6678968B1 - Short-circuit prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a short-circuit preventive tool capable of preventing a short circuit between different phases in a screw for fixing an electric wire or an electric wire in an electric wire inserting / pulling-out operation with respect to an electric energy meter, and applicable to an electric energy meter having different rated currents. SOLUTION: A pair of sandwiching members sandwiching both sides of the watt hour meter, an adjusting member for adjusting a distance between the pair of sandwiching members according to a distance between both sides of the watt hour meter, and the power amount. A short-circuit characterized by comprising a shield member facing a partition wall between electric wire fixing screws of different phases adjacent to each other, the shield member being movable in a distance direction between both sides of the watt-hour meter. Preventive device. [Selection diagram]

Description

  The present invention relates to a short-circuit preventive tool that prevents short-circuits between electric wires during an electric wire insertion / removal operation for a watt hour meter.

  When inserting, or pulling out the electric wire from or to the meter for replacement, inspection, repair, etc. of the watt-hour meter (hereinafter referred to as wire insertion / removal work), the wire fixing screw (hereinafter, Tighten or loosen the "screw"). The screw is in direct contact with the wire and is in a charged state. The smart meter introduced in recent years has a low partition wall between terminals of different phases, and there is a risk that the screw may protrude beyond the height of the partition wall as the screw is loosened. There is a risk that a short circuit between different phases or a short circuit between different phases due to electric wires and screws when inserting and removing the electric wire from the terminal block may occur.

  Therefore, for example, Patent Document 1 proposes a short-circuit prevention tool including a sandwiching portion that can sandwich the terminal block from the side surface, and an insulating tooth portion that can face the field wall between the terminals.

JP, 2017-020978, A

  However, in the above-mentioned conventional patent document 1, it is necessary to design dedicated products for watt-hour meters having different rated currents (that is, different terminal arrangements or meter widths).

  The present invention has been made in view of the above problems, and an object thereof is to prevent a short circuit between different phases in an electric wire fixing screw or an electric wire in an electric wire insertion / removal work with respect to a watt hour meter, and different rated currents. It is to provide a short-circuit prevention device that can be applied to an electric energy meter.

The short-circuit prevention tool according to claim 1 of the present invention includes a pair of sandwiching members that sandwich both side portions of the watt hour meter, and between the pair of sandwiching members according to a distance between both side portions of the watt hour meter. An adjusting member for adjusting the distance and a shield member facing the partition wall between the electric wire fixing screws of different phases adjacent to each other of the watthour meter are provided, and the shield member is a distance direction between both sides of the watthour meter. The adjustment member is characterized in that a mark line indicating the position of the adjustment member corresponding to each watt hour meter is displayed on the adjustment member .

  In the short-circuit prevention tool according to claim 2 of the present invention, the pair of clamping members are engaged with the first recesses of the watt-hour meter, so that the movement of the short-circuit prevention tool in the substantially vertical direction is restricted. Is characterized by.

  The short-circuit prevention tool according to claim 3 of the present invention is an up-and-down shift preventing member that is restricted from moving in a substantially vertical direction by engaging with the second recess of the watt-hour meter. It is characterized by being provided.

  The short circuit preventer according to claim 4 of the present invention is characterized in that it has a partition wall facing a lower end portion of the terminal block of the watt hour meter.

  According to the invention as set forth in claim 1, the short-circuit preventive device adjoins the pair of clamping members for clamping both sides of the watthour meter, the adjusting member for adjusting the distance between the pair of clamping members, and the watthour meter. Since the shielding member is provided with a shielding member facing the partition wall between the screws for fixing electric wires of different phases, and the shielding member is movable in the distance direction between the both sides of the watt-hour meter, the sandwiching members have different widths between the both sides. The watt-hour meter can be sandwiched, and the shield member can face the partition wall between adjacent wire fixing screws of different phases even in watt-hour meters having different terminal arrangements. That is, in the wire insertion / removal work for watt-hour meters having different rated currents, it is possible to prevent short-circuiting between different phases in the wire fixing screw or the wire with a single short-circuit prevention tool without requiring dedicated products. Further, since the sandwiching member sandwiches both sides of the watt-hour meter, it is possible to prevent the short circuit preventive tool from being displaced in the distance direction between both sides of the watt-hour meter and the depth direction of the watt-hour meter.

  According to the invention as set forth in claim 2, since the pair of sandwiching members engage with the first concave portion of the watt-hour meter, the movement of the short-circuit prevention tool in the substantially vertical direction is restricted. It is possible to prevent the short circuit prevention tool from being displaced or dropped in the substantially vertical direction.

  According to the invention as set forth in claim 3, the short-circuit prevention tool engages with the second recess of the watt-hour meter to restrict the movement of the short-circuit prevention tool in the substantially vertical direction. With the provision, it is possible to prevent the short-circuit prevention tool from slipping or falling off in the substantially vertical direction with respect to the watt hour meter.

  According to the invention of claim 4, the short-circuit prevention tool has the partition wall facing the lower end portion of the terminal block of the watt-hour meter, so that the electric wire is inserted into the insertion hole of the watt-hour meter from below. At this time, since the electric wire cannot enter the front of the terminal block, it is possible to prevent a short circuit between different phases due to the conductor portion of the electric wire coming into contact with the screw for fixing the electric wire.

It is the perspective view which looked at the short circuit prevention tool attached to the electric energy meter of 30 A of rated currents from the upper side of (a) front side, and the lower side of (b) front side. It is a (a) top view, a (b) front view, and a (c) side view of a short circuit preventive tool with which a shift prevention member was erected, which is attached to a watt-hour meter with a rated current of 30A. It is a (a) top view, a (b) front view, and a (c) side view of a short circuit preventive tool in a state where a slip prevention member was attached to a watt-hour meter with a rated current of 30A. It is the perspective view seen from (a) front side upper part of the short-circuit prevention tool in the state which the shift prevention member stood up attached to the watt-hour meter of rated current 30A, and (b) rear side upper part. It is the perspective view seen from (a) front side upper part of the short circuit preventive tool in the state where the shift prevention member was attached, which was attached to the watt-hour meter of rated current 30A, and was seen from (b) rear side upper part. It is the perspective view which looked at the short circuit prevention tool attached to the watt-hour meter of 60 A of rated currents from the upper side of (a) front side, and the lower side of (b) front side. It is the perspective view seen from (a) front side upper part and (b) rear side upper part of the short-circuit prevention tool with which the slip prevention member was erected, which is attached to the watt-hour meter of rated current 60A. It is the perspective view which looked at the short circuit prevention tool attached to the watt-hour meter of 120 A of rated currents from the upper side of (a) front side, and the lower side of (b) front side. It is the perspective view seen from the upper side of the (a) front side of the short circuit preventive tool in the state where the slip prevention member stood up attached to the watt-hour meter of rated current 120A, and (b) from the upper back side. It is the perspective view which looked at the short circuit preventive tool attached to the electric energy meter whose rated current is (A) 120A, (b) 30A, and (C) 60A from the bottom. It is the front view and side view which show the outline of a watt-hour meter whose rated current is (A) and (b) is 30A, (c) and (d) is 60A, and (e) and (f) is 120A.

  Embodiments of the present invention will be described below with reference to the drawings. The following description of the preferred embodiments is merely an example, and is not intended to limit the present invention, its application, or its use. Here, the case where the short-circuit prevention tool 3 of the present invention is attached to the terminal block 10 of the watt-hour meter 1 from the front is shown. FIG. 1 is a perspective view of a short-circuit preventive tool 3 attached to a watt-hour meter 1 having a rated current of 30 A, viewed from the front upper side in a state in which an electric wire is removed from the watt-hour meter 1, (b) watt-hour meter 1 4 is a perspective view seen from the lower front side in a state in which an electric wire is attached. FIG. 2 is a (a) plan view, a (b) front view, and a (c) side view of the short-circuit preventive tool 3 attached to the watt-hour meter 1 having a rated current of 30 A and in which the shift preventing member 312 is erected. . FIG. 3 is (a) a plan view, (b) a front view, and (c) a side view of the short-circuit preventive tool 3 attached to the watt-hour meter 1 having a rated current of 30 A and in which the shift preventing member 312 is down. . FIG. 4 is a perspective view of the short-circuit prevention tool 3 attached to the watt-hour meter 1 having a rated current of 30 A, in which the shift prevention member 312 is erected, as viewed from above (a) front side and from above (b) rear side. . FIG. 5 is a perspective view of the short-circuit preventive tool 3 attached to the watt-hour meter 1 having a rated current of 30 A, in which the anti-misalignment member 312 is down, as viewed from above (a) front side and above (b) rear side. . 6A and 6B are perspective views of the short-circuit preventive tool 3 attached to the watt-hour meter 1 having a rated current of 60 A as seen from the front upper side in a state where the electric wire is removed from the watt-hour meter 1, and FIG. 4 is a perspective view seen from the lower front side in a state in which an electric wire is attached. FIG. 7 is a perspective view of the short-circuit prevention tool 3 attached to the watt-hour meter 1 having a rated current of 60 A, in which the shift preventing member 312 is erected, as viewed from above (a) front side and from above (b) rear side. . FIG. 8 is a perspective view of the short-circuit prevention tool 3 attached to the watt-hour meter 1 having a rated current of 120 A, as seen from the front upper side in a state where the electric wire is removed from the watt-hour meter 1, (b) the watt-hour meter 1 4 is a perspective view seen from the lower front side in a state in which an electric wire is attached. FIG. 9 is a perspective view of the short-circuit prevention tool 3 attached to the watt-hour meter 1 having a rated current of 120 A, in a state where the shift preventing member 312 is erected, as viewed from above (a) front side and from above (b) rear side. . FIG. 10 is a perspective view of the short-circuit preventive tool 3 attached to the watt-hour meter 1 having a rated current (a) of 120 A, (b) of 30 A, and (c) of 60 A as viewed from below. FIG. 11 is a front view and a side view showing an outline of the watt-hour meter 1 having rated currents (a) and (b) of 30 A, (c) and (d) of 60 A, and (e) and (f) of 120 A. It is a figure. In the following description, the front-rear direction and the left-right direction are as shown in FIGS. 1, 6 and 8.

As shown in FIGS. 11A, 11 </ b> C, and 11 </ b> E, the watt-hour meter 1 has a terminal block 10 at its lower end. The watt-hour meter 1 having a rated current of 30 A has four terminal portions 11, and the watt-hour meter 1 having a rated current of 60 A and the watt-hour meter 1 having a rated current of 120 A have six terminal portions 11, each of which has a terminal portion. The arrangement intervals of 11 are different.
In the case of the rated current of 30 A, as shown in FIG. 1B, each of the four electric wires 2a to 2d arranged in the left-right direction at intervals is a conductor portion (not shown) in which a plurality of conductive wires are twisted together. And an insulating coating 22 for covering the conductor portion, and the upper end portion of the conductor portion is inserted into the terminal block 10 through the insertion hole 16 on the lower surface of the watt-hour meter 1 and then the wire fixing screw is provided. It is fixed to the terminal portion 11 by 12. In-phase voltages are supplied to the electric wires 2a and 2d, 2b and 2c, respectively. A partition wall 13 is provided between adjacent electric wire fixing screws 12, but the height of the partition wall 13 is such that when the electric wire fixing screw 12 is loosened, the head of the electric wire fixing screw 12 is a partition wall. 13 is a height protruding from the front end surface of 13. Further, in the case of the rated current of 60 A, as shown in FIG. 6B, the in-phase voltage is supplied to the electric wires 2e and 2j, 2f and 2i, 2g and 2h among the six electric wires 2e to j. ing. Similarly, in the case of the rated current of 120 A, as shown in FIG. 8B, in-phase voltages are supplied to the wires 2k and 2p, 2l and 2o, 2m and 2n among the six wires 2k to 2p. Has been done.
Regarding the shape of the watt-hour meter 1, in the case of the rated current of 30 A, the terminal block 10 has a substantially rectangular parallelepiped recess (second recess) 15. In the case of the rated currents of 60 A and 120 A, substantially rectangular parallelepiped notches (first recesses) 14 are provided on both sides of the terminal block 10.

  As shown in FIGS. 1 to 10, the short-circuit prevention tool 3 includes a main body portion 31, a pair of holding members 33, 33 for holding both side portions of the watt hour meter 1, and an amount of electric power depending on an amount pulled out from the main body portion 31. An adjusting member 32 that adjusts the distance between the sandwiching members 33, 33 according to the width of the meter 1 and two shield members that face the partition wall 13 between the electric wire fixing screws 12 of different phases of the watthour meter 1 that are adjacent to each other. 34, 34 are provided.

  The main body portion 31 includes an upper side portion 310 facing above the wire fixing screw 12 of the terminal block 10, that is, near the upper end portion of the terminal block, and below the wire fixing screw 12 of the terminal block 10, that is, a lower end portion of the terminal block. It is composed of a lower side portion (partition wall) 317 facing in the vicinity and a connecting portion 318 that connects the right ends of the upper side portion 310 and the lower side portion 317 in a substantially U shape, and has high insulation and durability such as polycarbonate. It is preferably made of a material. At a substantially central portion in the left-right direction of the upper side portion 310, an undulating shift preventing member 312 that engages with the concave portion 15 of the watt-hour meter 1 having a rated current of 30 A is provided. The shift prevention member 312 has a shape in which a substantially flat plate-shaped arm portion 313 and an engagement portion 314 are connected at substantially right angles at their one ends, and the other end of the arm portion 313 is at a substantially central portion in the left-right direction of the upper side portion 310. , Is rotatably supported vertically. In the state in which the shift prevention member 312 is down, the engagement portion 314 is in a state of being inserted into the recessed portion 15 of the watt-hour meter 1 having a rated current of 30 A, which restricts the vertical movement of the short-circuit prevention tool 3. . In the state in which the shift preventing member 312 is erected, the lower surface of the lower side portion 317 is provided with a convex portion 317a that extends horizontally toward the rear. As shown in FIG. 10, the rear end surface of the convex portion 317a and the front end surface of the lower end portion of the terminal block 10 are substantially flush with each other, and a gap G1 between the rear surface of the left and right end portions of the lower side portion 317 and the lower end portion of the terminal block 10 is formed. The front-rear diameter of is smaller than the outer diameter of the electric wires 2a to 2p. Hollow portions 310a and 317b opened at the left end for inserting the adjusting member 32 are provided in the upper side portion 310 and the lower side portion 317 along the longitudinal direction.

  The adjusting member 32 is preferably made of a highly durable material such as polycarbonate, and is slidably inserted into the hollow portions 310a and 317b of the upper side portion 310 and the lower side portion 317 of the main body 31, respectively. It has an arm 320 and a lower arm (partition wall) 321, and an adjustment bar 322 connected between the left end portions thereof, and is provided so as to be freely drawn from the main body portion 31. As shown in FIG. 10, the front-rear diameter of the gap G2 between the rear end surface of the lower arm 321 and the lower end of the terminal block 10 is smaller than the outer diameter of the electric wires 2a to 2p. An adjusting member fixing screw 311 is provided on the front left end of the upper side portion 310 of the main body 31, and the position of the adjusting member 32 with respect to the main body 31 is fixed by fastening the adjusting member fixing screw 311. In addition, as shown in FIGS. 6 and 8, on the front surfaces of the adjusting member 32, the upper arm 320, and the lower arm 321, a mark line 323 indicating the position of the adjusting member 32 corresponding to each watt hour meter 1 is displayed. There is. Thereby, the operator can set the position of the adjusting member 32 without hesitation, and the workability is improved.

  On the back surface of the connecting portion 318 of the main body 31 and the adjusting bar 322, the holding members 33, 33 for holding both side portions of the watt hour meter 1 are rotatably supported by the shaft portions located at the same height. The electric power meter 1 is used in a rotated state according to the type. The sandwiching member 33 has a substantially rectangular parallelepiped shape and is preferably formed of a material having a large friction coefficient such as rubber. The height h1 of the engaging portion 331 on one side and the height h2 of the engaging portion 332 on the other side with respect to the shaft portion of the sandwiching member 33, and the respective positions, are the watt hour meter 1 of rated currents 60A and 120A, respectively. The size and position are such that they fit into the notch portion 14. Further, the sandwiching member 33 has contact surfaces 333 that contact both side surfaces of the watthour meter 1 having a rated current of 30A. Then, on the front surfaces of the main body 31 and the adjusting member 32, as shown in FIGS. 1, 6 and 8, mark lines 319 and 324 indicating the positions of the upper and lower ends of the holding member 33 corresponding to each watt hour meter 1. Is displayed. Thereby, the operator can set the orientation of the holding member 33 without hesitation, and the workability is improved.

  Between the upper side portion 310 and the lower side portion 317 of the main body portion 31, there are provided a total of two insulating shield members 34, 34 that can slide left and right. The shielding member 34 has a shape in which the upper and lower sides and the left and right sides are framed by four substantially rectangular plate bodies 34 a to 34 d, and the rear ends of the left and right plate bodies 34 b and 34 c are substantially on the front surface of the partition wall 13 of the terminal block 10. The abutting contact is such that the head of the wire fixing screw 12 does not project forward even when the wire fixing screw 12 is loosened. The plate bodies 34a and 34d on the upper surface and the lower surface are slidably connected to the upper side portion 310 and the lower side portion 317, respectively. As a result, the left and right plate bodies 34b and 34c are separated from each other between the adjacent wire fixing screws 12 of different phases according to the type of the watt-hour meter 1 (that is, the arrangement of the terminal portion 11) while keeping the space between them. It is used after being moved to a position facing the wall 13. In addition, a substantially circular through hole 341 is provided at a substantially central portion of the plate body 34a on the upper surface, and at a position facing the partition wall 13 between the wire fixing screws 12 of different phases of each watt hour meter 1, By engaging the ball plunger 316 provided on the lower surface of the upper side portion 310, the shield members 34, 34 can be easily positioned, and the shield members 34, 34 must be subjected to a certain external force in the left-right direction. Does not move left or right. Further, as shown in FIGS. 1, 6 and 8, on the front surface of the main body portion 31, mark lines 315 indicating the positions of the shielding members 34, 34 corresponding to the watt-hour meters 1 are displayed. Thereby, the operator can set the positions of the shielding members 34, 34 without hesitation, and the workability is improved.

Next, a method of replacing the watt-hour meter 1 using the short-circuit prevention tool 3 of the present invention and the function and effect of the present invention will be described. First, a method for replacing the watt-hour meter 1 having a rated current of 30 A will be described.
In preparation for the replacement work, first, the adjustment member 32 is slid to the left and right to move the adjustment member 32 to a position where it is not pulled out from the main body portion 31 shown in FIG. 1, and then the adjustment member fixing screw 311 is tightened. The position of the adjusting member 32 with respect to the portion 31 is fixed. Next, the holding member 33 is rotated so as to face the direction shown in FIG. At this time, the distance between the contact surfaces 333, 333 of the sandwiching members 33, 33 is slightly shorter than the distance between both sides of the watthour meter 1. Accordingly, when the short-circuit prevention tool 3 is attached to the watt-hour meter 1, the holding member 33 is pushed into the watt-hour meter 1 until both sides thereof are held, so that the holding member 33 is elastic. Both side portions of 1 can be firmly sandwiched and fixed to each other. Then, the two shield members 34, 34 are slid to the position shown in FIG. 1 along the marking lines, and the ball plunger 316 positions them. The preparation is complete.
Next, the clamping member 33 is pushed into the electric power meter 1 to be removed from the electric wires 2a to 2d from the front until the both sides of the electric energy meter 1 are clamped, so that the clamping member 33 is elastic by the electric power meter. Both sides of 1 are firmly sandwiched. After the mounting of the short-circuit prevention tool 3 on the watt-hour meter 1 is completed, the screw 12 for fixing the electric wire may be loosened using a screwdriver, and the electric wires 2a to 2d may be removed. At this time, the head of the wire fixing screw 12 is not exposed to the front side of the front surface of the shielding members 34, 34. Then, when attaching the new watt-hour meter 1 to the electric wires 2a to 2d, insert the electric wires 2a to 2d into the vicinity of the terminals in the electric power meter 1 to which the short-circuit prevention tool 3 is attached in the same manner as above, and fix the electric wires. It suffices to fasten and fix it with the screws for use 12.
Next, a method for replacing the watt-hour meter 1 having a rated current of 60 A will be described. The basic method is the same as that for the watt-hour meter 1 having the rated current of 30 A described above, but is different in the following points. As shown in FIGS. 6 and 7, since the shift prevention member 312 is not used, it is kept upright from the preparation stage to the completion of the replacement work. In the preparation stage, the adjusting member 32 is fixed by the adjusting member fixing screw 311 while being pulled out to the mark line 323 of 60A. Further, the holding member 33 is rotated so that the shaft portion 330 is on the upper side. At this time, the distance between the engaging portions 331 and 331 of the sandwiching members 33 and 33 is slightly shorter than the distance between the notches 14 and 14 of the watthour meter 1. Thus, when the short-circuit prevention tool 3 is attached to the watt-hour meter 1, the engaging portions 331 and 331 of the holding member 33 are pushed into the watt-hour meter 1 until both sides thereof are held, whereby the holding member 33 is held. However, due to its elasticity, both sides of the watt-hour meter 1 can be firmly sandwiched and fixed to each other.
Further, as shown in FIGS. 8 and 9, the watt-hour meter 1 having a rated current of 120 A does not use the shift prevention member 312, and therefore is kept in a standing state from the preparation stage to the completion of the replacement work. In the preparation stage, the adjusting member 32 is fixed by the adjusting member fixing screw 311 while being pulled out to the mark line 323 of 120A. Further, the holding member 33 is rotated so that the shaft is on the lower side. At this time, the distance between the engaging portions 332 and 332 of the sandwiching members 33 and 33 is slightly shorter than the distance between the notches 14 and 14 of the watthour meter 1. Thus, when the short-circuit prevention tool 3 is attached to the watt-hour meter 1, the engaging portions 332 and 332 of the holding member 33 are pushed into the watt-hour meter 1 until both sides thereof are held, thereby holding the holding member 33. However, due to its elasticity, both sides of the watt-hour meter 1 can be firmly sandwiched and fixed to each other.

  According to the short-circuit prevention tool 3 configured in this manner, the pair of clamping members 33 that clamps both sides of the watt-hour meter 1, the adjustment member 32 that adjusts the distance between the pair of clamping members 33, and the watt-hour meter 1 And the shielding members 34, 34 facing the partition wall 13 between the adjacent electric wire fixing screws 12 of different phases, and the shielding members 34, 34 are movable in the distance direction between the both sides of the watt hour meter 1. Therefore, the sandwiching member 33 can sandwich the watt-hour meter 1 having different widths between both sides, and the shielding members 34, 34 are also provided between the adjacent wire fixing screws 12 of different phases even in the watt-hour meter 1 having different terminal arrangements. It can face the partition wall 13. That is, in the wire insertion / removal work for the watt-hour meters 1 having different rated currents, a single short-circuit preventive tool 3 is used for the wire fixing screw 12 or the wires 2a to 2d, 2e to 2j, and 2k to 2p without requiring dedicated products. Short circuit between different phases can be prevented. Further, since the sandwiching member 33 sandwiches both sides of the watt-hour meter 1, it is possible to prevent the short-circuit prevention tool 3 from shifting in the distance direction between both sides of the watt-hour meter 1 and the depth direction of the watt-hour meter 1.

  Further, the pair of holding members 33 engages with the notch 14 of the watt-hour meter 1 or engages with the recessed portion 15 of the watt-hour meter 1 so that the short-circuit prevention tool 3 moves in a substantially vertical direction. The movement of the short-circuit prevention tool 3 in the substantially vertical direction is regulated by the provision of the undulation-free shift preventing member 312 whose movement is restricted. Therefore, the short-circuit prevention tool 3 shifts in the substantially vertical direction with respect to the watt-hour meter 1. Can be prevented from falling off.

  The rear end surface of the convex portion 317a and the front end surface of the lower end portion of the terminal block 10 are substantially flush with each other, and the front and rear diameters of the gap G1 between the rear surfaces of the left and right end portions of the lower side portion 317 and the lower end portion of the terminal block 10, and Since the front-back diameter of the gap G2 between the rear end surface of the lower arm 321 and the lower end of the terminal block 10 is smaller than the outer diameter of the electric wires 2a to 2p, the electric wires 2a to 2q are inserted into the insertion hole 16 of the watt-hour meter 1 from below. At this time, since the electric wires 2a to 2q cannot enter the space in front of the terminal block 10, it is possible to prevent a short circuit between different phases due to the conductor portion of the electric wire coming into contact with the electric wire fixing screw 12.

  The present invention is not limited to the above-described embodiment and can be modified without departing from the gist of the present invention, and the shape, size, thickness, etc. of each part of the short-circuit preventive tool can be appropriately changed. For example, the shape of the shielding member does not have to be a shape obtained by combining flat plates, and may be any shape that can partition adjacent electric wires, such as a rectangular parallelepiped shape with holes.

1 electricity meter
12 Screws for fixing electric wires
13 partition walls
14 Notch (first recess)
15 recess (second recess)
312 Locking member
317 Lower side (partition wall)
32 Adjustment member
321 Lower arm (partition wall)
33 clamping member
34 Shielding member

Claims (4)

A pair of sandwiching members for sandwiching both sides of the watt hour meter, an adjusting member for adjusting the distance between the pair of sandwiching members according to the distance between both sides of the watt hour meter, and the watt hour meter adjacent to each other. A shielding member facing the partition wall between the electric wire fixing screws of different phases, the shielding member is movable in the distance direction between the both sides of the watt-hour meter, and the adjustment member has each electric power amount. A short circuit preventive tool characterized in that a mark line indicating the position of the adjusting member corresponding to the meter is displayed .
  The short-circuit prevention tool according to claim 1, wherein movement of the short-circuit prevention tool in a substantially vertical direction is restricted by engaging the pair of holding members with the first recess of the watt-hour meter.   The short-circuit prevention tool according to claim 1 or 2, further comprising: an up-and-down shift preventing member that restricts movement of the short-circuit prevention tool in a substantially vertical direction by engaging with the second recess of the watt-hour meter. .   The short-circuit prevention tool according to claim 1, further comprising a partition wall facing a lower end portion of the terminal block of the watt-hour meter.

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