The present invention generally relates to Plug-in box/Plug-in unit of electrical busways, and more particularly the present invention relates to an improved installation arrangement of Plug-in boxes (PIB) on to a Plug-in feeder (PIF).
BACKGROUND OF THE INVENTION
Plug-in boxes (PIB) are installed in busways to tap off the power from the main conductors. Plug-in Feeders (PIF) are a type of busway feeder where plug-in holes are provided for insertion of plug-in box, which typically consist a circuit breaker. In general, each plug-in point of plug-in feeder is used for installation of single plug-in box. During installation of this Plug-in boxes on to Plug-in Feeders, manual efforts are to be exerted on Box to push and engage all the jaws of PIB on to PIF conductors.
PIBs intended for higher rating needs higher cross section of conductor that connects between Jaws to terminals of SCPD. This creates loss in flexibility of conductors and constraints on assembly.
The installation of Plug in Boxes (PIB) on Plug in Feeders (PIF) calls for adverse manual efforts due to the position, orientation of insertion and absence lifting provisions. In particular for higher rated PIBs the numbers of Jaws are to be increased to maintain current density and naturally size and weight of the PIBs increases. This adds up to the insertion forces required to engage PIB on to PIFs. Thus, to summarize, the inventors of the present invention discover the following limitations of the existing arrangement for plug-in box:
• The existing design of a plug-in box uses two plug-in point feature; however, the current path and internal routing design are unknown.
• Existing design does not provide any provision for insertion and removal of Plug-in box.
Therefore, there is a dire need to provide an improved arrangement for plug-in boxes with provision for ease of insertion and removal which overcomes the drawbacks of the existing arrangement.

SUMMARY OF THE INVENTION
The following disclosure presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an extensive overview of the present invention. It is not intended to identify the key/critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concept of the invention in a simplified form as a prelude to a more detailed description of the invention presented later.
An objective of the present invention is to provide an arrangement for Plug-in Box with multiple plug-in points and provision for ease of insertion and removal.
Another objective of the present invention is to provide two plug-in points for single plug-in box, splitting the jaws and current path, flexible copper cables/braids in two parallel paths.
Accordingly, in one aspect, in one implementation, the present invention discloses an arrangement for Plug-in Box with multiple plug-in points, wherein said arrangement for Plug-in Box being removably inserted into a Plug-in feeder busway. The arrangement for Plug-in Box comprising:
At least Short Circuit Protection Device (SCPD), wherein a current path
from said plug-in feeder busway to said SCPD in said plug-in box split in
two parallel current paths by providing at least an upper contact assembly
and a lower contact assembly;
At least a plug-in box insertion clamp for insertion and removal of said
plug-in box with said plug-in feeder busway;
Wherein said plug-in box being inserted over a top housing of said plug-in
feeder busway, by using a bolt engagement of said plug-in box insertion
clamp and at least a plug-in feeder insertion clamp.

In second aspect, in one implementation, the present invention discloses an
arrangement comprising:
a Plug-in Box (2) with multiple plug-in points as mentioned herein above; and
a Plug-in feeder bus way (1);
Wherein, said Plug-in Box (2) is being removably inserted into said Plug-in feeder busway (1).
Accordingly, based on the above disclosures of the present invention, PIBs intended for higher rating needs higher cross section of conductor that connects between Jaws to terminals of SCPD are provided. This creates loss in flexibility of conductors and constraints on assembly. By having split points and making parallel path aforesaid issue is taken care. The installation of Plug in Boxes (PIB) on Plug in Feeders (PIF) calls for adverse manual efforts due to the position, orientation of insertion and absence lifting provisions. In particular, for higher rated PIBs the numbers of Jaws are to be increased to maintain current density, naturally size, and weight of the PIBs increases. This adds up to the insertion forces required to engage PIB on to PIFs. Additional clamps and brackets added helps in replacing manual efforts of pushing PIB to application of torque through right tools for reduction of efforts.
Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention.
BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS
The above and other aspects, features and advantages of the embodiments of the present disclosure will be more apparent in the following description taken in conjunction with the accompanying drawings, in which:

Figure 1: shows a schematic view of a Plug-in busway, according one implementation of the present invention.
Figure 2: Shows a schematic view of a plug-in box, according to one of the implementations of the present invention.
Figure 3: Shows the sectional view of the plug-in box, according to one implementation of the present invention.
Figure 4: shows the Plug-in Box being inserted but not completely inserted in PIF, according to one implementation of the present invention.
Figure 5: shows the Plug-in Box being inserted but not completely inserted in PIF, and figure 5(a) shows the detailed view of the insertion torque direction in clockwise and PIB gets pushed downwards, according to one implementation of the present invention.
Figure 6: shows the Plug-in Box being removed from PIF, according to one implementation of the present invention, and figure 6(a) shows the detailed view of the removal torque direction in anticlockwise & PIB gets pushed upwards, according to one implementation of the present invention.
Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may not have been drawn to scale. For example, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure. Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.

DETAILED DESCRIPTION OF THE PRESENT INVENTION
The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding, but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.
The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustration purpose only and not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents.
It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, a reference to "a component surface" includes a reference to one or more of such surfaces.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments belong. Further, the meaning of terms or words used in the specification and the claims should not be limited to the literal or commonly employed sense, but should be construed in accordance with the spirit of the disclosure to most properly describe the present disclosure.

The terminology used herein is for the purpose of describing particular various embodiments only and is not intended to be limiting of various embodiments. As used herein, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising" used herein specify the presence of stated features, integers, steps, operations, members, components, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, members, components, and/or groups thereof. Also, Expressions such as "at least one of," when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list.
The present invention solves two problems, the first one is the splitting of plug-in points i.e. using two plug-in points divides the current into two paths reducing the current density & watt loss in each part improving the temperature rise performance within plug-in box. This also helps in avoiding the assembly issues because of bulky copper flexible for high rating plug-in boxes.
This invention also give provision for ease of insertion and removal of plug-in box as it is generally difficult to insert and remove high rating plug-in boxes as force requirement is higher in them.
In the present invention, splitting the current path into two plug-in points allows using two braids of lesser cross-section area per phase, which helps in avoiding bending issue for flexible, which can tear off insulation sleeves and make assembly of plug-in box difficult. For installation of plug-in box guiding and clamping provisions are available in this invention with provision of ease of insertion and removal.

The present invention consists of two sets of contact assemblies (an assembly of jaws, jaw holding molded parts & copper flexible braids/cable) and a provision for giving clamping force to hold plug-in box with plug-in feeder and also provide ease of insertion and removal which is attained by screwing and unscrewing the bolt provided to do so.
In one implementation, the first part is the multiple plug-in point. Two plug-in points are used to install one plug-in box typically of 630A and above rating. In this the use of two contact assemblies are required which divides the current path into two parallel paths. This helps in improvising the performance by reducing the current density in each path. Two braids/cable i.e., one from each contact assembly gets connected to one phase terminal of an SCPD (generally an MCCB). Watt loss in each path gets reduce and thermal dissipation area is increased providing better temperature rise performance. Also, the assembly becomes easy as two flexible copper braids/cables are used instead of one bulky flexible copper braid/cable which is difficult to bend, insulation can get tear off because of bending, will have more current density & more watt loss.
In one implementation, the second part is a clamp modified as insertion tool for ease of insertion & removal of plug-in box. Insertion & removal of plug-in boxes are generally difficult because of high force requirement which is because jaws are designed to have good contact pressure after inserting in plug-in feeder conductors to reduce joint resistance. In this disclosed invention the clamp use to provide clamping force to hold plug-in box with plug-in feeder is modified to provide ease of insertion & removal. One part is fixed with plug-in box & other is mounted on plug-in feeder. A bolt is provided which interact with both the components and screwing it will move the plug-in box downward and unscrewing will move plug-in box upward.
In one implementation, reference numerals and the corresponding structural components are mentioned as below:

1. Plug-in feeder busway
1.1. Plug-in point
1.2. Plug-in feeder housing
2. Plug-in Box
2.1. Upper contact assembly
2.2. Lowe contact assembly
2.3. SCPD (MCCB)
2.4. Spreaders
2.5. Upper contact assembly flexible copper braids
2.6. Lower contact assembly flexible copper braids
2.7. PIB insertion clamp
2.8. PIF insertion clamp
2.9. PIF insertion bracket
2.10. Jaws
2.11 Ml0 bolt
2.12 Ml0 Nut
In one implementation, reference is made to figures 1 to 6.
The said invention may consist of a Plug-in busway 1 with minimum two plug-in points as shown in figure (1). Plug-in box 2 with a rating 630A and above are designed to have two contact assemblies, upper contact assembly 2.1 and lower contact assembly 2.2 as shown in figure (2).
In one implementation, current path from plug-in feeder busway 1 to SCPD (MCCB) 2.3 in plug-in box 2 is split or divided in two parallel current paths by providing upper contact assembly 2.1 and lower contact assembly 2.2. Now, the R-phase of upper contact assembly flexible copper braid 2.5 and R-phase of lower contact assembly flexible copper braid 2.6 gets bolted to Spreader 2.4 of R-phase of SCPD (MCCB) 2.3. Similarly, for all other phases the connection is provided as shown in figure (3). This avoids use of bulky braid/cable/rigid links, improves

performance and flexibility to optimize cross section area. As current path is split, flow of rated current is split between upper contact assembly 2.1 and lower contact assembly 2.2 to respective phase spreader 2.4 of SCPD (MCCB) 2.3.
As two contact assemblies are given: no. of jaws 2.10 are more, hence, the insertion force requirement will also increase, and hence a provision is given in said invention to reduce insertion & removal force. PIB insertion clamp 2.7 are given on top and bottom of plug-in box 2 and PIF insertion clamp 2.8. PIF insertion bracket are assembled on PIF housing 1.2 such that after plug-in box 2 is inserted on plug-in feeder busway 1 they come at top and bottom of plug-in box 2 near the PIB insertion clamp 2.7. In this condition, Plug-in box 2 is not yet completely inserted, as more force is required. Now engagement between PIB insertion clamp 2.7 and assembly of PIF insertion clamp 2.8 & PIF insertion bracket 2.9 is done using a M10 bolt 2.11 such that as it gets screwed in clockwise direction with help of torque wrench. The engagement pulls plug-in box 2 downwards and help in insertion of plug-in box 2 in plug-in feeder busway 1 as shown in figure (4) & (5). Similarly, a M10 nut is provided on bolt, which will be kept fixed with thread locker such that its position won't change during bolt screwing and unscrewing, and when bolt is getting unscrewed the nut will push PIB insertion clamp 2.7 away resulting in Plug-in box 2 removal.
In one implementation, offset in PIF insertion clamp 2.8 gives benefit of bolting engagement of PIB insertion clamp 2.7 & PIF insertion clamps 2.8 over the top housing of plug-in busway 1 avoiding the interference of bolt and plug-in busway top housing.
In another implementation, when Plug-in box 2 is being inserted, the bolt engagement is done with PIB insertion clamp 2.7 & PIF insertion clamp 2.8 and torque is applied in clockwise direction on M10 bolt 2.11. This will push Plug-in box 2 in downward direction as shown in detail view 6. Similarly, when Plug-in box 2 is already in inserted condition and need to be removed, torque should be

given in anticlockwise direction on a bolt means 2.11 as this will push the PIB insertion clamp 2.7 away from PIF insertion clamp 2.8 i.e., in upward direction resulting removal of Plug-in box 2. It is ensured that there is no relative motion between a bolt means 2.11 and a nut means 2.12 to ensure this upward movement of Plug-in box 2 during removal.
Some of the non-limiting advantages of the present invention are as follows:
1. The present invention uses a common Plug-in box using multiple plug-in
points. The said invention uses multiple plug-in point avoiding bending issue of thicker braid/cable and bending and difficulty of assembly.
2. The present invention uses a parallel current path for current division &
effective current density to overcome the problems of loss in flexibility of conductors and constraints on assembly.
3. The said invention gives provision for easy insertion and removal of Plug-
in box from plug-in feeders by using a common bolting arrangement.
4. Provision for insertion and removal consist clamping arrangement between
PIF and PIB insertion clamps where the offset design of PIF insertion clamp gives advantage for tightening at the centre position over the housing of PIF on both top and bottom end of PIB4.Parallel current path provide ease of assembly and reduced current density in jaws.
Those skilled in the art will recognize other use cases, improvements, and modifications to the embodiments of the present disclosure. All such improvements and other use-cases are considered within the scope of the concepts disclosed herein.

WE CLAIM :

1. An arrangement for Plug-in Box (2) with multiple plug-in points, wherein
said arrangement for Plug-in Box (2) being removably inserted into a
Plug-in feeder busway (1), wherein said arrangement for Plug-in Box (2)
comprising:
At least Short Circuit Protection Device (SCPD) (2.3), wherein a current path from said plug-in feeder busway (1) to said SCPD (2.3) in said plug-in box (2) split in two parallel current paths by providing at least an upper contact assembly (2.1) and a lower contact assembly (2.2); At least a plug-in box insertion clamp (2.7) for insertion and removal of said plug-in box with said plug-in feeder busway (1); Wherein said plug-in box being inserted over a top housing of said plug-in feeder busway (1), by using a bolt engagement of said plug-in box insertion clamp (2.7) and at least a plug-in feeder insertion clamp (2.8).
2. The arrangement as claimed in claim 1, wherein the R-phase of said upper contact assembly flexible copper braid (2.5) and R-phase of lower contact assembly flexible copper braid (2.6) gets bolted to a spreader (2.4) of R-phase of said SCPD.
3. The arrangement as claimed in claim 1, wherein said plug-in box insertion clamp (2.7) provided on a top and bottom of said plug-in box (2).
4. The arrangement as claimed in claim 1, wherein said plug-in feeder is provided with at least an insertion bracket (2.9).
5. The arrangement as claimed in claim 1, wherein when said plug-in box (2) being inserted into said plug-in feeder busway (1), the bolt engagement enables pushing of said plug-in box insertion clamp (2.7) into plug-in

feeder insertion clamp (2.8) and torque applied in a clockwise direction on at least a bolt means (2.11).
6. The arrangement as claimed in claim 1, wherein when Plug-in box (2) being removed, torque applied in anticlockwise direction on said bolt means (2.11) to enable pushing away of said plug-in box insertion clamp (2.7) from said plug-in feeder insertion clamp (2.8) in a upward direction.
7. An arrangement comprising:
a Plug-in Box (2) with multiple plug-in points as claimed in any one of claims 1 to 6; and a Plug-in feeder busway (1);
Wherein, said Plug-in Box (2) is being removably inserted into said Plug-in feeder busway (1).