Switchgear assembly for construction for preventing power outages

Abstract

The present invention provides an interlock device for preventing elbow separation of a construction switch and a construction switch assembly including the same. An interlock device according to one embodiment of the present invention is applied to be attached to a construction switch that is electrically connected to a plurality of riser cables. The construction switch includes an interlock body and a plurality of elbows into which the plurality of riser cables are each fed. The interlock device includes i) a sling having elasticity and having a plurality of insertion holes formed side by side, ii) a ring connected to one end of the sling, and iii) a carabiner connected to the other end of the sling and applied to be hooked onto the interlock body.

Description

Technology Field

[0001] The present invention relates to an interlock device and a construction switch assembly including the same. More specifically, the present invention relates to an interlock device for preventing elbow separation of a construction switch and a construction switch assembly including the same. Background Technology

[0002] When disconnecting the elbow of a construction switch, it may be disconnected due to a worker's error in judgment without verification of whether it has been operated. Furthermore, there are no devices or procedures to verify whether the construction switch has been operated.

[0003] Consequently, worker safety accidents during elbow separation continue to occur due to insufficient verification of operation during the removal of construction switches. In addition, power outages caused by errors and negligence on the part of on-site workers are continuously increasing. Meanwhile, there is a lack of a mechanism to prevent elbow separation while the switch is in the closed state in the operation procedure for utilizing construction switches. The problem to be solved

[0004] We intend to provide an interlock device. In addition, we intend to provide a construction switch assembly including the same. means of solving the problem

[0005] An interlock device according to one embodiment of the present invention is applied to be attached to a plurality of riser cables and a construction switch electrically connected to the plurality of riser cables. The construction switch includes an interlock body and a plurality of elbows into which the plurality of riser cables are each fed. The interlock device includes i) a lanyard having elasticity and having a plurality of insertion holes formed side by side, ii) a ring connected to one end of the lanyard, and iii) a carabiner connected to the other end of the lanyard and applied to be hooked onto the interlock body.

[0006] Multiple insertion holes may be formed closer to the ring than to the carabiner. The distance between the insertion hole closest to the ring among the multiple insertion holes and the ring may be greater than the circumference of the vertical cable. The ring may include i) a curved body portion, and ii) an end portion formed at the end of the curved body portion and applied to be inserted into one of the multiple insertion holes. The maximum diameter of the end portion may be smaller than the diameter of the insertion hole and larger than the diameter of the curved body portion. The average diameter of the end portion may be larger than the diameter of the curved body portion. The diameter of the end portion may increase as it moves away from the connection point with the curved body portion. The end portion may be formed of an elastic material.

[0007] A plurality of interlock devices may be provided. The plurality of interlock devices may include i) a first interlock device connected to the R phase of the interlock body from one side of the construction switch, ii) a second interlock device connected to the S phase of the interlock body from one side, and iii) a third interlock device connected to the T phase of the interlock body from one side. The length of the third interlock device may be greater than the length of the second interlock device, and the length of the second interlock device may be greater than the length of the first interlock device. The plurality of interlock devices may further include i) a fourth interlock device connected to the R phase of the interlock body from the other side of the construction switch, ii) a fifth interlock device connected to the S phase of the interlock body from the other side, and iii) a sixth interlock device connected to the T phase of the interlock body from the other side. The length of the sixth interlock device may be greater than the length of the fifth interlock device, and the length of the fifth interlock device may be greater than the length of the fourth interlock device. When the interlock body is located closer to one side than to the other, the length of the sixth interlock device is greater than the length of the third interlock device, the length of the fifth interlock device is greater than the length of the fourth interlock device, and the length of the fourth interlock device may be greater than the length of the first interlock device.

[0008] A construction switch assembly according to one embodiment of the present invention comprises i) a plurality of riser cables, ii) a construction switch electrically connected to the plurality of riser cables, and iii) an interlock device attached to the plurality of riser cables and the construction switch. The construction switch comprises i) an interlock body to which the interlock device is attached, and ii) a plurality of elbows into which the plurality of riser cables are each fed. The interlock device comprises i) a sling having elasticity and having a plurality of insertion holes formed side by side, ii) a ring connected to one end of the sling, and iii) a carabiner connected to the other end of the sling and hooked onto the interlock body.

[0009] Multiple insertion holes may be formed closer to the ring than to the carabiner. The distance between the insertion hole closest to the ring among the multiple insertion holes and the ring may be greater than the circumference of the riser cable. A lanyard may wrap around the riser cable and the ring may be inserted into one of the multiple insertion holes so that the interlock device can be secured to the riser cable.

[0010] The interlock devices are provided in plurality, and the plurality of interlock devices may include i) a first interlock device connected to the R phase of the interlock body from one side of the construction switch, ii) a second interlock device connected to the S phase of the interlock body from one side, and iii) a third interlock device connected to the T phase of the interlock body from one side. The length of the third interlock device may be greater than the length of the second interlock device, and the length of the second interlock device may be greater than the length of the first interlock device. The plurality of interlock devices may include i) a fourth interlock device connected to the R phase of the interlock body from the other side of the construction switch, ii) a fifth interlock device connected to the S phase of the interlock body from the other side, and iii) a sixth interlock device connected to the T phase of the interlock body from the other side.

[0011] The length of the sixth interlock device is greater than the length of the fifth interlock device, and the length of the fifth interlock device may be greater than the length of the fourth interlock device. The length of any one of the fourth, fifth, and sixth interlock devices may be greater than the length of another of the first, second, and third interlock devices. As the first and fourth interlock devices move further away from the interlock body, the distance from the third and sixth interlock devices, respectively, may increase. As the first and fourth interlock devices move further away from the interlock body, they may face upward. As the second, third, fifth, and sixth interlock devices move further away from the interlock body, they may face downward. Effects of the invention

[0012] Preventing elbow detachment can prevent worker safety accidents caused by arc burns. The quality and reliability of electricity supply can be improved by reducing temporary and momentary power outages caused by worker negligence. Worker safety can be enhanced by ensuring stability when utilizing construction switches. Safety can be ensured by implementing a design that prevents potential worker errors when attempting elbow detachment due to erroneous judgment. Power outages caused by worker negligence can be prevented. Brief explanation of the drawing

[0013] FIG. 1 is a schematic drawing of a construction switch assembly according to one embodiment of the present invention. FIG. 2 is a schematic diagram of an interlock device included in the construction switch assembly of FIG. 1. Figure 3 is a schematic enlarged view of the interlock body of part III of Figure 1. Figure 4 is a schematic enlarged view of the riser cable in section IV of Figure 1. Figure 5 is a flowchart of a schematic work method using the construction switch assembly of Figure 1. Figure 6 is a flowchart of a schematic method for returning to work using the construction switch assembly of Figure 1. Specific details for implementing the invention

[0014] The technical terms used herein are for the reference of specific embodiments only and are not intended to limit the invention. The singular forms used herein include plural forms unless phrases clearly indicate otherwise. The meaning of "comprising" as used in the specification specifies a particular characteristic, area, integer, step, action, element, and / or component, and does not exclude the presence or addition of other particular characteristic, area, integer, step, action, element, component, and / or group.

[0015] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as generally understood by those skilled in the art to which this invention pertains. Terms defined in commonly used dictionaries are further interpreted to have meanings consistent with relevant technical literature and the present disclosure, and are not interpreted in an ideal or highly formal sense unless otherwise defined. For example, the term “applied” described below is interpreted to include both the state in which it is appropriately used and the state prior to appropriate use.

[0016] Expressions described in the singular in this specification may be interpreted as singular or plural unless explicit expressions such as "one" or "single" are used.

[0017] In this specification, terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. Such terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present disclosure, the first component may be named the second component, and similarly, the second component may be named the first component.

[0018] In the flowchart described with reference to the drawings in this specification, the order of operations may be changed, several operations may be merged or some operations may be divided, and certain operations may not be performed.

[0019] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0020] FIG. 1 schematically illustrates a construction switch assembly (1000) according to one embodiment of the present invention. The construction switch assembly (1000) of FIG. 1 is merely for illustrating the present invention and is not limited thereto. Accordingly, the construction switch assembly (1000) may be modified differently.

[0021] As illustrated in FIG. 1, the construction switch assembly (1000) includes a construction switch (300) and an interlock device (10) attached thereto. In addition, the construction switch assembly (1000) may include other components.

[0022] The construction switch (200) includes an interlock body (2001), elbows (2003), and a lever (2005). In addition, the construction switch (300) may include other parts. The construction switch (200) is installed by fixing it to a utility pole (P). Alternatively, the construction switch (200) may be installed at a different location.

[0023] The construction switch (200) is used to control and protect the power system at a construction site. That is, it is used to isolate, control, and protect electrical equipment from damage caused by errors. The construction switch (200) is used when connecting power from an external power source, such as a generator or utility, to a temporary electrical system installed at the construction site. By using the construction switch (200), a safe and reliable electrical system can be maintained at the construction site. The construction switch (200) can prevent accidents, equipment damage, and shutdowns at the construction site, and can efficiently and effectively distribute power to meet the requirements for construction.

[0024] The interlock main body (2001) controls the operating sequence of the components to ensure they are activated in the correct order and prevents simultaneous activation. For example, the interlock prevents the circuit breaker from closing when the construction switch or grounding switch is not in an open state. In this case, damage to the construction switch (200) or the occurrence of an electric arc can be prevented. Additionally, the interlock main body (2001) can prevent damage to the construction switch (200) while preventing electrical hazards by blocking access by workers during maintenance or inspection of the construction switch (200), thereby preventing unauthorized or accidental switching operations.

[0025] The construction switch (200) opens and closes according to the operation of the lever (2005) shown in FIG. 1. For example, the construction switch (200) is in an open state because the green end of the lever (2005) shown in FIG. 1 is lowered in the interlock device (10). Conversely, the construction switch (200) is in a closed state when the red end of the lever (2005) is lowered in the interlock device (10). As shown in FIG. 1, the installation of the interlock device (10) is performed while the construction switch (200) is in an open state.

[0026] A plurality of riser cables (300) are electrically connected to the construction switch (200). The riser cables (300) are each fed into the elbows (2003). That is, the R-phase, S-phase, and T-phase riser cables (300) are each fed into the elbows (2003) to the power side on the left, and the U-phase, V-phase, and W-phase riser cables (300) are each fed into the elbows (2003) to the load side on the right. In other words, the construction switch (200) functions as a switch that receives power from the left and supplies it to the load on the right.

[0027] Due to the interlock device (10), it is difficult to separate the elbows (2003) from the construction switch (200). That is, even if a worker attempts to separate the elbows (2003) due to a misjudgment, the interlock device (10) prevents the separation of the elbows (2003). In this way, by implementing the operation of the construction switch (200) and the separation procedure of the elbows (2003) in a mutually dependent manner, the construction switch (200) is opened, and the elbows (2003) cannot be separated without releasing the interlock device (10). That is, when the operating rod (not shown) is hooked onto the carabiner (105) (shown in FIG. 2, hereinafter the same) of the interlock device (10) and pulled, the carabiner (105) is released all at once, allowing the elbows (2003) to be separated. Such an interlock device (10) will be explained in more detail through FIG. 2.

[0028] FIG. 2 schematically shows an interlock device (10) included in the construction switch assembly (1000) of FIG. 1. The structure of the interlock device (10) of FIG. 2 is merely for illustrating the present invention and is not limited thereto. Accordingly, the interlock device (10) can be modified differently.

[0029] The interlock device (10) includes a lanyard (101), a loop (103), and a carabiner (105). In addition, the interlock device (10) may include other parts. The interlock device (10) is attached to the interlock body (2001) and the riser cables (300), respectively.

[0030] The lanyard (101) has elasticity and extends in one direction. The lanyard (101) can be formed from insulating resin or leather, etc. Thus, the interlock device (10) can be easily attached to and detached from the construction switch (200). The length and width of the lanyard (101) can be varied depending on the position of the installed phases.

[0031] Insertion holes (101a) are formed in parallel in the lanyard (101). The insertion holes (101a) are spaced apart from each other at a predetermined equal interval. After winding the lanyard (101) around the vertical cable (300) (shown in FIG. 1, hereinafter the same), the ring (103) is inserted into the insertion holes (101a) to securely fix the interlock device (10) to the vertical cable (300). To this end, the insertion holes (101a) are positioned closer to the ring (103) than to the carabiner (105).

[0032] The ring (103) is connected to one end of the lanyard (101), that is, the left side. The ring (103) includes a curved main body (1031) and an end (1033). The end (1033) is formed at the end of the curved main body (1031). The end (1033) is inserted into and secured in one of the insertion holes (101a). The maximum diameter (D1033) of the end (1033) is smaller than the diameter (D101a) of the insertion hole (101a). Therefore, since the end (1033) is inserted well into the insertion hole (101a), the lanyard (101) can be easily secured to the vertical cable (300). Additionally, the diameter of the end (1033) increases as it moves further away from the curved main body (1031) to which it is connected. That is, the end (1033) is formed in the shape of a truncated cone. As a result, after the end (1033) is inserted into the insertion hole (101a), the end (1033) can be properly secured in the insertion hole (101a).

[0033] Meanwhile, the maximum diameter (D1033) of the end portion (1033) is larger than the diameter (D1031) of the curved main body portion (1031). More specifically, the average diameter of the end portion (1033) is larger than the diameter (D1031) of the curved main body portion (1031). That is, the end portion (1033) can be fitted and fixed to the curved main body portion (1031) in the form of a hollow cap made of an elastic material. As a result, the end portion (1033) can be firmly fixed to the curved main body portion (1031). The end portion (1033) can be manufactured from natural rubber or resin material.

[0034] As shown in FIG. 2, the distance (d) between the insertion hole closest to the ring (103) and the ring (103) is greater than the circumference (D300) (shown in FIG. 1) of the riser cable (300) (shown in FIG. 1). Therefore, the lanyard (101) can be wrapped around the riser cable (300) one or more times and attached, so the interlock device (10) is firmly fixed to the riser cable (300).

[0035] The carabiner (12) is connected to the other end of the lanyard (101), that is, the right side. The carabiner (12) is secured by being hooked onto the interlock body (2001) (shown in FIG. 1). The carabiner (12) can be easily removed from the interlock body (2001) by touching it with an operating rod (not shown).

[0036] FIG. 3 schematically shows an enlarged view of the interlock body (2001) of part III of FIG. 1. The structure of the interlock body (2001) in FIG. 3 is merely for illustrating the present invention and is not limited thereto. Accordingly, the structure of the interlock body (2001) can be modified differently.

[0037] As illustrated in FIG. 3, the interlock device (10) may be provided in multiple numbers. That is, the interlock device (10) includes a first interlock device (10a), a second interlock device (10b), a third interlock device (10c), a fourth interlock device (10d), a fifth interlock device (10e), and a sixth interlock device (10f). The first interlock device (10a) is connected to the R phase of the interlock body (2001) from one side, i.e., the left side, of the construction switch (200) (illustrated in FIG. 1, hereinafter the same). Additionally, the second interlock device (10b) is connected to the S phase of the interlock body (2001) from the left side of the construction switch (200). And the third interlock device (10c) is connected to the T phase of the interlock body (2001) from the left side of the construction switch (200). Meanwhile, the fourth interlock device (10d) is connected to the R phase of the interlock main body (2001) from the other side, i.e., the right side, of the construction switch (200). Additionally, the fifth interlock device (10e) is connected to the S phase of the interlock main body (2001) from the right side of the construction switch (200). And the sixth interlock device (10f) is connected to the T phase of the interlock main body (2001) from the right side of the construction switch (200).

[0038] Here, referring to FIG. 1, the length of the third interlock device (10c) is greater than the length of the second interlock device (10b). Also, the length of the second interlock device (10b) is greater than the length of the first interlock device (10a). That is, since the interlock body (2001) is located at the top of the construction switch (200), the length of the interlock device (10) increases as it goes down along the R phase, S phase, and T phase. This applies equally to the fourth interlock device (10d), the fifth interlock device (10e), and the sixth interlock device (10f). That is, the length of the sixth interlock device (10f) is greater than the length of the fifth interlock device (10e). Also, the length of the fifth interlock device (10e) is greater than the length of the fourth interlock device (10d). Meanwhile, these are large interlock devices (10c, 10d, 10e). Finally, the interlock body (2001) is positioned closer to the left side of the construction switch (200) than to the right side. Accordingly, the length of the sixth interlock device (10f) is greater than the length of the third interlock device (10c). That is, by adjusting the length of the interlock device (10) according to the position of the interlock body (2001), the interlock device (10) can be properly attached to the construction switch (200) to prevent the worker from malfunctioning the construction switch (200).

[0039] Meanwhile, as illustrated in FIG. 4, due to the position of the interlock body (2001), the first interlock device (10a) and the fourth interlock device (10d) face upward as they move further away from the interlock body (2001). That is, the first interlock device (10a) faces upward to the left, and the fourth interlock device (10d) faces upward to the right, and are installed in the construction switch (200). That is, since the riser cables (300) corresponding to the first interlock device (10a) and the fourth interlock device (10d), respectively, are located relatively above the interlock body (2001), the first interlock device (10a) and the fourth interlock device (10d) are each installed in an upward diagonal direction.

[0040] In contrast, due to the position of the interlock main body (2001), the second interlock device (10b), the third interlock device (10c), the fifth interlock device (10e), and the sixth interlock device (10f) face downwards as they move further away from the interlock main body (2001). That is, the second interlock device (10b) and the third interlock device (10c) face the lower left side, and the fifth interlock device (10e) and the sixth interlock device (10f) face the lower right side when installed in the construction switch (200). That is, since the vertical cables (300) corresponding to the second interlock device (10b), the third interlock device (10c), the fifth interlock device (10e), and the sixth interlock device (10f), respectively, are located relatively below the interlock body (2001), the second interlock device (10b), the third interlock device (10c), the fifth interlock device (10e), and the sixth interlock device (10f) are each installed in a downward diagonal direction.

[0041] FIG. 4 schematically shows an enlarged view of the riser cable (500) of part IV of FIG. 1. FIG. 4 is merely for illustrating the invention and is not limited thereto. Accordingly, it can be modified differently.

[0042] As shown in FIG. 4, the lanyard (101) wraps around the riser cable (300) once. Alternatively, the lanyard (101) may wrap around the riser cable (300) two or more times. In this case, the end (10) of the loop (103) is inserted into the insertion hole (101a) to secure the interlock device (10). An elbow (2003) with a diameter larger than that of the riser cable (300) is located on the left side where the interlock device (10) is subjected to force. Therefore, even if the interlock device (10) moves to the left due to force, it is caught on the elbow (2003) and does not move further, and is securely fixed to the riser cable (300).

[0043] FIG. 5 schematically illustrates a flowchart of a work method using the construction switch assembly (1000) of FIG. 1. The work method of FIG. 5 is merely for illustrating the present invention and is not limited thereto. Accordingly, the work method may be modified differently.

[0044] As illustrated in FIG. 5, a work method using a construction switch assembly (1000) includes the steps of: providing a construction switch connected to a riser cable (S10); connecting an interlock device to the riser cable and the interlock body of the construction switch (S20); closing the construction switch (S30); cutting the jumper wire of the construction switch installation post (S40); closing the line switch (S50); opening the construction switch (S60); releasing the interlock device from the riser cable and the interlock body (S70); cutting the power side jumper wire, testing the current, and short-circuiting the ground (S80); and separating the elbow from the construction switch (S90). In addition, the work method using the construction switch assembly (1000) may include other steps.

[0045] In step (S10), a construction switch connected to a riser cable is provided. That is, the construction switch (200) of FIG. 1 is provided. The construction switch (200) can be installed on a utility pole (P).

[0046] Next, in step (S20), the interlock device is connected to the riser cable and the interlock body of the construction switch. That is, as shown in FIG. 1, both ends of the interlock device (10) are connected to the riser cable (300) and the interlock body (2001), respectively. This operation is possible because the construction switch has not yet been switched on.

[0047] In step (S30), the construction switch is switched on. That is, the lever shown in FIG. 1 is rotated so that the red end faces downward. As a result, the power side and the load side of the construction switch (200) are electrically connected.

[0048] Next, in step (S40), the jumper wire of the utility pole on which the construction switch is installed is cut. That is, the jumper wire installed on top of the construction switch is cut.

[0049] In step (S50), the line switch is closed. That is, the distribution line switch is closed together with the construction switch.

[0050] In step (S60), the construction switch is opened. That is, the lever shown in FIG. 1 is rotated again so that the green end faces downward. As a result, the power side and the load side of the construction switch (200) are electrically connected.

[0051] In step (S70), the interlock device is released from the riser cable and the interlock body. That is, while the interlock device is connected to the construction switch, the worker cannot detach the elbow. Therefore, the worker can confirm that the construction switch is being closed.

[0052] In step (S80), the power-side jumper wire is cut, current is tested, and short-circuit grounding is performed. That is, the power-side jumper wire of the construction switch is cut, current is tested, and short-circuit grounding is performed.

[0053] Finally, in step (S90), the elbow is disconnected from the construction switch. Since the interlock device is disconnected, the elbow can be easily disconnected. In this way, safety accidents and power outages caused by worker error can be fundamentally prevented by using the interlock device.

[0054] FIG. 6 schematically illustrates a flowchart of a method for returning to work using the construction switch assembly of FIG. 1. The method for returning to work in FIG. 6 is merely for illustrating the present invention and is not limited thereto. Accordingly, the method for returning to work can be modified differently.

[0055] The method for returning to work according to FIG. 6 includes the steps of connecting an elbow to a construction switch (S100), connecting a jumper wire to the power supply side and releasing the voltage test and short-circuit ground (S110), connecting an interlock device to a riser cable and an interlock body (S120), closing the construction switch (S130), opening the line switch (S140), connecting a jumper wire to a utility pole where the construction switch is installed (S150), opening the construction switch (S160), and releasing the interlock device from the riser cable and the interlock body (S190). In addition, the method for returning to work according to FIG. 6 may include other additional steps.

[0056] In step (S100), the elbow is connected to the construction switch. As a result, preparations are made to feed the riser connecting line into the elbow.

[0057] In step (S110), the power side jumper wire connection, voltage testing, and short-circuit grounding are released. As a result, the construction switch is prepared to be closed.

[0058] In step (S120), the interlock device is connected to the riser cable and the interlock body. That is, as shown in FIG. 1, both ends of the interlock device (10) are connected to the riser cable (300) and the interlock body (2001), respectively. This operation is possible because the construction switch has not yet been switched on.

[0059] In step (S130), the construction switch is switched on. That is, the lever shown in FIG. 1 is rotated so that the red end faces downward. As a result, the power side and the load side of the construction switch (200) are electrically connected.

[0060] In step (S140), the line switch is opened. That is, the distribution line switch is opened.

[0061] In step (S150), the jumper wires of the utility pole on which the construction switch is installed are connected. The jumper wires installed above the construction switch are connected.

[0062] In step (S160), the construction switch is opened. That is, the lever shown in FIG. 1 is rotated again so that the green end faces downward. As a result, the power side and the load side of the construction switch (200) are electrically connected.

[0063] In step (S170), the interlock device is released from the riser cable and the interlock body. That is, while the interlock device is connected to the construction switch, the worker cannot detach the elbow. Therefore, the worker can confirm that the construction switch is engaged.

[0064] Although the present invention has been described as previously stated, those skilled in the art will readily understand that various modifications and variations are possible without departing from the concept and scope of the claims set forth below. Explanation of the symbols

[0065] 10, 10a, 10b, 10c, 10d, 10e, 10f. Interlock device 101. Tightener 101a. Insertion hole 103. Ring 105. Carabiner 1031. Curved main body 1033. End 200. Construction switch 300. Rising cable 2001. Interlock main body 2003. Elbow 2005. Lever 1000. Construction switchgear assembly P. Jeonju

Claims

Claim 1 A construction switch assembly comprising a plurality of riser cables, a construction switch electrically connected to the plurality of riser cables, and an interlock device attached to the plurality of riser cables and the construction switch, wherein the construction switch comprises an interlock body to which the interlock device is attached, and a plurality of elbows into which the plurality of riser cables are each fed, and the interlock device comprises a lanyard having elasticity and having a plurality of insertion holes formed in parallel, a ring connected to one end of the lanyard, and a carabiner connected to the other end of the lanyard and hooked onto the interlock body, wherein the plurality of insertion holes are formed closer to the ring than to the carabiner, and the distance between the insertion hole closest to the ring among the plurality of insertion holes and the ring is greater than the circumference of the riser cable, and the interlock device is provided in a plurality, and the plurality of interlock devices include a first interlock device connected to the R phase of the interlock body from one side of the construction switch, and a second interlock connected to the S phase of the interlock body from the one side. A construction switch assembly comprising a device, a third interlock device connected to the T-phase of the interlock body from one side, a fourth interlock device connected to the R-phase of the interlock body from the other side of the construction switch, a fifth interlock device connected to the S-phase of the interlock body from the other side, and a sixth interlock device connected to the T-phase of the interlock body from the other side, wherein the length of the sixth interlock device is greater than the length of the fifth interlock device, and the length of the fifth interlock device is greater than the length of the fourth interlock device, and the length of any one of the fourth interlock device, the fifth interlock device, and the sixth interlock device is greater than the length of another interlock device among the first interlock device, the second interlock device, and the third interlock device. Claim 2 delete

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