F0RM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION (See section 10; rule 13)
1. Title of the invention: ARRANGEMENT IN COMPACT ELECTRICAL SUPPLY
DISTRIBUTION PAN ASSEMBLY FOR ELECTRICAL ENCLOSURE.
2. Applicant(s):
(a) NAME: LARSEN & TOUBRO LIMITED
(b) NATIONALITY: An Indian Company
(c) ADDRESS: L & T House, Ballard Estate, Mumbai
400 001, State of Maharashtra, India
3. PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed:

FIELD OF THE INVENTION
The present invention relates to an arrangement in compact electrical supply distribution PAN Assembly for Electrical Enclosure. More particularly, the present invention relates to an arrangement in compact electrical supply distribution PAN Assembly and it's fixing on the mounting plate. The present invention will be used/can be used in Distribution Box and Electric Supply Panel.
BACKGROUND OF THE INVENTION AND PRIOR ART
The existing PAN assembly either uses screwing methods or use snap fit methods which are very difficult to assemble on the base plate. The present method has a way of locking the Housing with the Base plate using Sliding and locking arrangement which gives advantage in terms of giving wider tolerance band.
The existing cover either uses riveting methods or use snap fit methods which don't have pokayoke. The present method has a way of locking the Cover with the Housing with a snap fit arrangement and the cover also has Pokayoke with Housing.
The other features of the present invention which are not available with other prior art: Provision to accommodate different incoming busbar size keeping common housing and common cover, Special profile in PAN housing to retain connecting busbar in its position, Flexibility of connecting busbar to accommodate small variation in terminal height of connecting breaker, End plate have windows for air circulation and Ease in assembly of end plate due to sliding lock arrangement.
The present invention is an improvement to available existing PAN assembly
OBJECTS OF THE INVENTION
One object of the present invention is to overcome the disadvantages / drawbacks of the prior art.
A basic object of the present invention is to provide an arrangement for compact electrical supply distribution PAN Assembly for Electrical Enclosure and it's fixing on the mounting plate.

Another object of the present invention is to provide a cost effective reliable PAN arrangement, which can ensure proper distribution of supply without any substantial voltage drop or excessive temperature rise at busbars.
These and other advantages of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.
SUMMARY OF THE INVENTION
The following 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.
According to one of the aspect of the present invention there is provided an arrangement in
compact electrical supply distribution PAN Assembly for Electrical Enclosure, arrangement
comprising:
a base plate; and
a PAN assembly mounted on said base plate with, said assembly comprises :
a cover on top of said assembly;
plurality of incoming bus bar/main bus bar placed on top of said housing;
plurality of outgoing bus bar/connecting bus bar placed on top of said housing;
a screw fixing said incoming and said outgoing bus bars ;
a spring washer fixing said incoming and said outgoing bus bars to fix both incoming and outgoing bus bars in the housing and maintaining desired level of contact pressure between joints of two busbars ; and
an end plate have various small windows to cover main busbar and better air circulation to reduce temperature rise during distribution of supply from incoming to outgoing circuit. Large windows provided for more air circulation. ;
wherein said main and connecting bus bar comprises simple profile and has special joints in-between said main and connecting bus bar.

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 THE ACCOMPANYING DRAWING
The following drawings are illustrative of particular examples for enabling methods of the present invention, are descriptive of some of the methods, and are not intended to limit the scope of the invention. The drawings are not to scale {unless so stated) and are intended for use in conjunction with the explanations in the following detailed description.
Figure 1 illustrates PAN Assembly.
Figure 2 illustrates exploded view of various components of a PAN assembly unit.
Figure 3 illustrates assembly of multiple PAN assembly required to be done outside before
mounting on base plate or directly at the base plate.
Figure 4 illustrates Flexibility of connecting busbar.
Figure 5 illustrates Special profile in PAN housing to retain connecting busbar in its position.
Figure 6 illustrates Housing, Cover and End plate fixing arrangement.
Figure 7 illustrates Housing at the bottom have two sliding.
Figure 8 illustrates Click fit fixing of PAN Assembly with Base plate.
Figure 9 illustrates cross-sectional view of fixing of PAN assembly with Base plate
Figure 10 illustrates Housing and Cover Dimensions (15) and (16) of one side.
Figure 11 illustrates (17) and (18) of other side.
Figure 12 illustrates Ribs at specific locations
Figure 13 illustrates Endplate (5) have various small windows
Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may have not 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.

DESCRIPTION OF THE INVENTION
The present invention describes the cost effective solution for distribution of supply to modular devices in the electrical enclosure. Unit is having Housing which houses Incoming and Outgoing busbars. Busbars are fixed with each other through screws. Unit is usually known as PAN assembly.
Clearance and creepage distance of incoming and outgoing busbar are maintained by specially designed housing and cover, Housing has a snap fit locking arrangement. Both housing and cover are easy to manufacture and all the components are easy to assemble for PAN unit of desired nos. of ways.
After proper placement of incoming busbars in the middle portion, Outgoing bus bars which also have clearance hole placed on the housing. Screw used from the top to fix both incoming and outgoing bus bars and maintain desired level of contact pressure. In final PAN Assembly, Connecting Busbar connected to outgoing breakers (All Modular Devices) and Incoming Busbar can be connected to breaker (MCB / RCCB or Isolator).
Housing at the bottom have special snap fit provision for its locking at the housing and ensuring alignment during cascading of PAN assemblies in VTPN Distribution Boxes. Assembly of multiple PAN assembly required to be done outside before mounting on base plate or directly at the base plate.
According to one of the embodiments of the present invention there is provided an arrangement in compact electrical supply distribution PAN Assembly for Electrical Enclosure. The arrangement comprising: a base plate ,and a PAN assembly ,mounted on the base plate with. The assembly comprises : a cover, on top of the assembly; plurality of incoming bus bar/main bus bar, placed on top of the housing; plurality of outgoing bus bar/connecting bus , bar placed on top of the housing; a screw fixing the incoming and the outgoing bus bars ; a spring washer fixing the incoming and the outgoing bus bars to fix both incoming and outgoing bus bars in the housing and maintaining desired level of contact pressure between joints of two busbars ; and an end plate(5) have various small windows to cover main busbar and better air circulation to reduce temperature rise during distribution of supply from incoming to outgoing circuit and large windows provided for more air circulation. ;
The main and connecting bus bar comprises simple profile and has special joints in-between the main and connecting bus bar.

The connecting busbar has a special profile to accommodate small variation in terminal height of connecting breaker adapted to achieve flexibility.
The special profile structure allows deliberate clearance between the connecting busbar and the main busbar which helps in adjustment of any Modular device connected at the connecting busbar.
The arrangement further comprises plurality of PAN housing.
The PAN housing having overlapping surface between two consecutive the PAN housing helps in maintaining appropriate creepage and clearance when multiple PAN housing connected with each other.
The PAN housing at the bottom of PAN assembly comprises special profile to retain connecting busbar in its position which helps in ease of joining bus bars and making complete PAN assembly.
The Incoming busbar current is sum of current in outgoing busbars for each phases.
The outgoing busbar carry less current and therefore it do not require same cross-sectional area as incoming conductor.
The Joints between simple profile of main and connecting busbar save copper wastage as both outgoing and incoming have two different cross-sectional area maintaining substantially same current density.
The PAN housing at the bottom have two sliding and two special snap fit locking provision for it's locking at the baseplate and ensuring alignment during cascading of PAN assemblies in VTPN Distribution Boxes.
The PAN housing comprises Ribs at specific locations and in the PAN housing adapted to make structure strong to withstand higher level of forces during short-circuit.
The incoming busbar and outgoing busbar are maintained by specially designed housing which separate different live phases and live parts to non-current carrying baseplate for Clearance and creepage distance.
The PAN Assembly with baseplate is mounted with Click fit fixing.

The cover and the housing comprises Click-fit fixing is given at diagonally opposite location for fixing cover with housing.
The main busbar cross section size increased by double for higher current rating (e.g. 250A) as compared to 125A main bus bar size.
The main busbar comprises provision to accommodate different incoming size helps in keeping common housing and common cover for two different current rating.
The housing and a Cover Dimensions and of one side are different from and of other side such that the cover comprises a Poka Yoke means to avoid wrong fixing with the housing.
The Pokayoke means is a Japanese method of fool proofing (mistake proofing) which means any object would go only in one direction and not in any other direction
The end plate comprises Sliding lock arrangement provided for ease in assembly of the end plate.
The sliding lock arrangement comprises Sliding part of end plate which slide over an internal rib in the housing.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS
PAN Assembly (1) mounted on Base plate (2) is shown in Fig.1. PAN assembly is an important component for distribution of supply to modular devices in the electrical enclosure. In Distribution box, Connecting Busbar of final PAN Assembly, connected to outgoing breakers (All Modular Devices) and Incoming Busbar of final PAN Assembly connected to main incoming breaker (MCB / RCCB or Isolator).Fig.2 shows exploded view of various components of a PAN assembly unit. It consists of Housing (3) which houses Incoming busbar (6) and Outgoing busbars (7). Busbars are fixed with each other through screw (8) and spring washer (9). Cover (3) protect any direct contact to live busbars. End Plate (5) is required to avoid accidental contact with main bus bar.
Assembly of multiple PAN assembly required to be done outside before mounting on base plate or directly at the base plate. Refer Fig.3, After proper placement of incoming busbars (6) in the middle portion of PAN housing assemblies, Outgoing bus bars(7), which is also have clearance hole, are placed on the top of housing. As shown in exploded view (Fig. 2), Screws (8) along with spring washer (9) used from the top to fix both incoming and outgoing bus bars in the housing and maintaining desired level of contact pressure between joints of

two busbars. Incoming busbar current is sum of current in outgoing busbars for each phases. Hence outgoing busbar carry less current and therefore it do not require same cross-sectional area as incoming conductor. Joints between simple profile of main and connecting busbar save copper wastage as both outgoing and incoming have two different cross-sectional area maintaining practically same current density. It is different from the conventional practice of making integrated joint free incoming and outgoing busbar from single sheet. These joint free integrated busbar also generate more copper wastage in the process of forming special desired profile.
Joint between main and connecting busbar also reduces insulation requirements between the two bus-bars of different potential. Hence, it helps to make entire PAN assembly further compact.
Fig. 4 illustrate, Flexibility of connecting busbar (7) achieved through a special profile to accommodate small variation in terminal height of connecting breaker. The structure of special profile (26) allows deliberate clearance between connecting busbar and main busbar which helps in adjustment of any Modular device connected at the connecting busbar. Due to this arrangement better contact pressure is achieved between connecting busbar and Modular device.
Special profile(26) in PAN housing (4) to retain connecting busbar in its position (Refer Fig. 5) which helps in ease of joining bus bars and making complete PAN assembly.
Clearance and creepage distance of incoming busbar(6) and outgoing busbar(7) are maintained by specially designed housing which separate different live phases and live parts to non-current carrying baseplate. Overlapping surface between two consecutive housing helps in maintaining appropriate creepage and clearance when multiple PAN housing connected with each other.
Refer Fig. 7, Fig.8 and Fig.9, Housing at the bottom have two sliding (12) and two special snap fit (11) locking provision (13) for it's locking at the baseplate and ensuring alignment during cascading of PAN assemblies in VTPN Distribution Boxes. Fig. 8 is showing Click fit fixing of PAN Assembly with Baseplate (2). Fig. 9 shows cross-sectional view of fixing of PAN assembly with Base plate (2)
For higher current rating (e.g. 250A), Cross-section of Main busbar (6) size increased by double as compared to 125A main bus bar size. Refer Fig. 12, Provision (19) to

accommodate different incoming main busbar size helps in keeping common housing and common cover for two different current rating.
Click-fit fixing is given at diagonally opposite location in cover (3) and housing (4) for fixing cover with housing. Housing and Cover Dimensions (15) and (16) of one side (Fig. 10) are different from (17) and (18) of other side (fig. 11). Therefore, Cover have a PokaYoke to avoid wrong fixing with the housing
Refer fig.12, Ribs at specific locations (20), (21) and (22) in the housing (4) make structure strong to withstand higher level of forces during short-circuit.
Sliding lock arrangement provided for ease in assembly of end plate (5). Fig.14 shows sectional view of Sliding part (24) of end plate which slide over internal rib (25) in the housing (4)
Fig.13 shows Endplate (5) have various small windows (22) to cover main busbar (6) and better air circulation to reduce temperature rise during distribution of supply from incoming to outgoing circuit. Large windows (23) provided for more air circulation.
Advantages:
• Compact design with appropriate creepage and clearance through special feature in the housing.
• Provision to accommodate different incoming busbar size keeping common housing and common cover.
• Special profile in PAN housing to retain connecting busbar in its position.
• Flexibility of connecting busbar to accommodate small variation in terminal height of connecting breaker.
• Cover have PokaYoke to avoid wrong fixing with the housing
• Click fit fixing of PAN Assembly with Baseplate.
• Ribs at specific location make structure strong to withstand higher level of forces during short-circuit.
• Endplate have windows for air circulation.
• Ease in assembly of end plate due to sliding lock arrangement.

Further Pokayoke is a Japanese method of fool proofing (mistake proofing) which means any object would go only in one direction and not in any other direction (eg. Pen drive goes inside Laptop only in one direction).
Features:
1. Compact design with appropriate creepage and clearance through special feature in the housing.
2. Provision to accommodate different incoming busbar size keeping common housing and common cover.
3. Special profile in PAN housing to retain connecting busbar in its position.
4. Flexibility of connecting busbar to accommodate small variation in terminal height of connecting breaker.
5. Cover have PokaYoke to avoid wrong fixing with the housing
6. Click fit fixing of PAN Assembly with Baseplate.
7. Ribs at specific location make structure strong to withstand higher level of forces during short-circuit.
8. Endplate have windows for air circulation.
9. Ease in assembly of end plate due to sliding lock arrangement.

WE CLAIM:
1. An arrangement in compact electrical supply distribution PAN Assembly for Electrical
Enclosure, arrangement comprising:
a base plate (2);and
a PAN assembly (1) mounted on said base plate with, said assembly comprises :
a cover (3) on top of said assembly;
plurality of incoming bus bar/main bus bar(6) placed on top of said housing;
plurality of outgoing bus bar/connecting bus (7) barplaced on top of said housing;
a screw (8) fixing said incoming and said outgoing bus bars ;
a spring washer (9) fixing said incoming and said outgoing bus bars to fix both incoming and outgoing bus bars in the housing and maintaining desired level of contact pressure between joints of two busbars; and
an end plate(5) have various small windows (22) to cover main busbar (6) and better air circulation to reduce temperature rise during distribution of supply from incoming to outgoing circuit and large windows (23) provided for more air circulation. ;
wherein said main and connecting bus bar comprises simple profile and has special joints in-between said main and connecting bus bar.
2. Arrangement as claimed in claim 1 wherein said connecting busbar has a special profile to accommodate small variation in terminal height of connecting breaker adapted to achieve flexibility.
3. Arrangement as claimed in claim 2 wherein said special profile structure (26) allows deliberate clearance between said connecting busbar and said main busbar which helps in adjustment of any Modular device connected at the connecting busbar.

4. Arrangement as claimed in claim 1 further comprises plurality of PAN housing (4).
5. Arrangement as claimed in claim 4 wherein said PAN housing having overlapping surface between two consecutive said PAN housing helps in maintaining appropriate creepage and clearance when multiple PAN housing connected with each other.
6. Arrangement as claimed in claim 4 wherein said PAN housing at the bottom of PAN assembly comprises special profile (26) to retain connecting busbar in its position which helps in ease of joining bus bars and making complete PAN assembly.
7. Arrangement as claimed in claim 1 wherein said Incoming busbar current is sum of current in outgoing busbars for each phases.
8. Arrangement as claimed in claim 7 wherein said outgoing busbar carry less current and therefore it do not require same cross-sectional area as incoming conductor.
9. Arrangement as claimed in claim 1 wherein said Joints between simple profile of main and connecting busbar save copper wastage as both outgoing and incoming have two different cross-sectional area maintaining substantially same current density.
10. Arrangement as claimed in claim 6 wherein said PAN housing at the bottom have two sliding (12) and two special snap fit (11) locking provision (13) for it's locking at the baseplate and ensuring alignment during cascading of PAN assemblies in VTPN Distribution Boxes.

11. Arrangement as claimed in claim 10 wherein said PAN housing comprises Ribs at specific locations (20), (21) and (22) in said PAN housing (4) adapted to make structure strong to withstand higher level of forces during short-circuit.
12. Arrangement as claimed in claim 1 wherein said incoming busbar(6) and outgoing busbar(7) are maintained by specially designed housing which separate different live phases and live parts to non-current carrying baseplate for Clearance and creepage distance.
13. Arrangement as claimed in claim 1 wherein said PAN Assembly with baseplate is mounted with Click fit fixing.
14. Arrangement as claimed in claim 1 wherein said cover and said housing comprises Click-fit fixing is given at diagonally opposite location for fixing cover with housing.
15. Arrangement as claimed in claim 1 wherein said main busbar (6) cross section size increased by double for higher current rating (e.g. 250A) as compared to 125A main bus bar size.
16. Arrangement as claimed in claim 1 wherein said main busbar comprises provision (19) to accommodate different incoming size helps in keeping common housing and common cover for two different current rating.
17. Arrangement as claimed in claim 1 wherein said housing and a Cover Dimensions (15) and (16) of one side are different from (17) and (18) of other side such that said cover comprises a PokaYoke means to avoid wrong fixing with the housing.
18. Arrangement as claimed in claim 1 wherein said Pokayoke means is a Japanese method of fool proofing (mistake proofing) which means any object would go only in one direction and not in any other direction

19. Arrangement as claimed in claim 1 wherein said end plate comprises Sliding lock arrangement provided for ease in assembly of said end plate (5).
20. Arrangement as claimed in claim 15 wherein said sliding lock arrangement comprises Sliding part (24) of end plate which slide over an internal rib (25) in said housing (4)
21. An arrangement in compact electrical supply distribution PAN Assembly for Electrical Enclosure as herein described and illustrated with reference to the accompanying drawings