FORM 2
The Patents Act 1970
(39 of 1970)
&
The Patent Rules 2003
COMPLETE SPECIFICATION
(See Section 10 and rule 13)
TITLE OF THE INVENTION:
ELECTRICAL CONTACT SYSTEM IN DISTRIBUTION BUS SYTEM FOR FRACTIONAL FEEDER MODULES IN SWITCHBOARDS APPLICANT:
LARSEN & TOUBRO LIMITED
L&T House, Ballard Estate, P.O. Box No. 278,
Mumbai, 400 001, Maharashtra INDIA.
PREAMBLE OF THE DESCRIPTION:
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED


A) TECHNICAL FIELD
[0001] The present invention generally relates to switchboards like and particularly to a power distribution system for fractional modules in the switchboards. The present invention more particularly relates to an electrical contact system in power distribution bus arrangement for the fractional feeder modules in switchboards like motor control centre (MCC) switchboards, switch gear assemblies, etc.
B) BACKGROUND OF THE INVENTION
[0002] Moulded Case Circuit Breakers (MCCB) are widely used in all types of low-voltage switchboards and panel boards. The MCCB are available in the ratings from 15 amps to 3000 amps. The breaker mechanism in the MCCB is totally sealed within an external moulded case. When the MCCB has a failure or problem, it must be replaced and cannot be repaired. These MCCBs are typically bolted onto the switchboard bus or provided with plug-in designs. The removal or addition of MCCBs to a switchboard should only take place with the switchboard power turned off.
[0003] The MCCB switchboard is used to direct electrical power from a main power source to other parts of the system. The switchboard is the assembly of panels which include switches and electric contacts that allow the electrical power to be redirected. The amount of electrical power fed into the switchboard must always be equal to the electrical power drawn out to the loads. The switchboard includes a group of bus bars which are generally wide strips of copper to which the switchgear is connected. These

2

bus bars allow the flow of large currents through the switchboard. The bus bars are supported by insulators since the bus bars have a potential electrocution hazard.
[0004] The electrical power contacts are arranged on the rear of the control unit of the switchboard. The electrical power contact is connected with the bus bar arranged on the panel frame of the switchboard through which the electrical power is supplied to each on-board piece of the system. The electrical power contact also brings a load into a contact with the load side terminal thereby switching on and off the electrical power supplied to the load side terminal through the control unit.
[0005] When the incoming electrical feeders are not well contacted with the fractional feeder modules or any power contact is mismatched with the mating contact of the feeder modules during the insertion of feeder modules in the switchboards, unpredictable functions and damages are generated in the switchboard. Hence there is a need to provide a power distribution contact system for the feeder modules of switchboards to meet the continuity in the requirements of power supply. Also there is need to provide a power distribution contact system to absorb the mismatch between the individual set of mating contacts and to provide the isolation requirements between the adjacent contacts. Further there is a need to provide a contact system which can be connected to any type of feeder modules such as full width module, half width module, quarter width module, etc., without modifying the contacts. Thus there is a need to provide a contact system in power distribution bus arrangement to achieve continuity of current while achieving the isolation and mismatch requirements.

3

[0006] The abovementioned shortcomings, disadvantages and problems are addressed herein and which will be understood by reading and studying the following specification.
C) OBJECTS OF THE INVENTION
[0007] The primary object of the present invention is to develop a power distribution contact system for fractional feeder modules in the switchboards to provide continuity in power supply in distributing the incoming electrical power into and out of the fractional feeder modules of the switchboards.
[0008] Another object of the present invention is to develop a contact system for the fractional feeder modules in the switch boards to support the requirements of isolation between the adjacent contacts.
[0009] Yet another object of the present invention is to develop a contact system for the fractional feeder modules in the switch boards to absorb the mismatch between the individual set of mating contacts in the system and that in the feeder modules.
[0010] Yet another object of the present invention is to develop a contact system for the fractional feeder modules in the switch boards to absorb the mismatch during the mating of the power contacts with the vertical distribution bars.
[0011] Yet another object of the present invention is to develop a modular contact system for the fractional feeder modules in the switchboards which is used for different type feeder modules like quarter-width feeder module, half-width feeder modules, full width feeder module etc.

4

[0012] Yet another object of the present invention is to develop a contact system for the fractional feeder modules in the switch boards to provide continuity of current while achieving the isolation and mismatch requirements.
[0013] These and other objects and advantages of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.
D) SUMMARY OF THE INVENTION
[0014] The various embodiments of the present invention provide a power distribution contact system for distributing power into and out of the fractional feeder modules in the switchboards like MCC switch boards. According to one embodiment of the present invention, an electrical contact system in the distribution bus system for fractional feeder modules in switchboards is provided with an incoming side contact system connected to vertical bus bar to draw the electrical power from the mains. The current carrying connectors are connected to the incoming side contact system. An outgoing side contact system is connected to the current carrying connectors to supply an input electrical power to the fractional feeder modules and to receive the output electrical power from the fractional feeder modules. The output electrical power from the feeder modules are fed to the end load devices through the cable termination connected to the current carrying connectors.
[0015] The Fractional feeder modules are connected to the outgoing side contact system. The outgoing side contact system has a first set of electrical contacts arranged

5

in a first row to supply the incoming electrical power to the fractional feeder modules and a second set electrical contacts arranged in a second row to receive the electrical power from the fractional feeder modules to supply the electrical power to the end load devices.
[0016] The outgoing side contact system provides an interface between the distribution bus system and the fractional feeder modules. The outgoing side contact system has main contacts and auxiliary contacts for mating with the main contacts and the auxiliary contacts mounted on the fractional feeder modules. The outgoing side contact system has a main contact plate provided with main contacts that are mated with the main contacts in the fractional feeder modules. The main contacts in the outgoing side contact system are arranged in two rows in the main contact plate to supply the electrical power to the fractional feeder modules and to receive the electrical power from the fractional feeder modules respectively. The main contact plate is provided with plurality of projections to provide a blind mating contact between the main contacts of the outgoing contact system and the main contacts of the fractional feeder modules.
[0017] The auxiliary contacts are provided in the auxiliary contact plate in the outgoing side contact system to mate with the auxiliary contacts in the fractional feeder modules. The auxiliary contact plate is provided with plurality of projections to provide a blind mating contact between the auxiliary contacts of the outgoing contact system and the auxiliary contacts of the fractional feeder modules.
[0018] The fractional feeder module is provided with plurality of locators which are received into the projections provided in the main contact plate and the auxiliary

6

contact plate at the outgoing side contact system to provide a blind mating contact between the main contacts of the outgoing side contact system and the main contacts of the fractional feeder modules and also between the auxiliary contacts of the outgoing contact system and the auxiliary contacts of the fractional feeder modules. The fractional feeder modules are provided with locators such that the main contacts and the auxiliary contacts in the fractional feeder modules absorb the mismatch over all the contact positions in orthogonal directions, individually. The fractional feeder module is a full width module or a half width module or a quarter width module.
[0019] The incoming side contact system is arranged with contacts in such a manner that the individual contacts housed within the incoming side contact system swivel sidewise to absorb the specified mismatch.
[0020] According to one embodiment of the present invention, the power distribution contact system includes a contact system on power incoming side, a contact system on feeder module side, a distribution bus arrangement which carries current between the contact systems and one or more feeder modules.
[0021] The contact system on power incoming side includes one or more individual contacts housed within the system. The individual contacts absorb specified mismatch of mating contacts by swivelling sidewise during insertion with main distribution vertical bus bars. When the contact system on incoming side is connected to the main distribution bus bars, the individual contacts draws current from the main distribution vertical bus bars and carries the current to the distribution bus arrangement.
7

[0022] The distribution bus arrangement having bus strips carries the current from the contact system on incoming side to the contact system on feeder module side through cables such like copper flex braids.
[0023] The contact system on feeder module side includes one or more power contact plates and one or more auxiliary contact plates, for each fractional module. Each power contact plate includes one or more power contacts. Each auxiliary contact plate provides a provision to accommodate one or more auxiliary contacts or secondary isolating contact (SIC) mounted on a plate of the feeder modules. Each power contact plate and each auxiliary contact plate of the contact system on feeder module side is provided with one or more cylindrical locators that are used to absorb any mismatch of over-all contact position of mating contacts in orthogonal directions when the feeder module is inserted with the contact system on feeder module side.
[0024] Upon receiving the current from the distribution bus arrangement, one set of power contacts of the contact system on feeder module side carries current to incoming contacts of the feeder modules. Another set of power contacts of the contact system on feeder module side receives the output current from outgoing contacts of the feeder modules and carries the output current back to the load devices through the distribution bus arrangement.
[0025] Thus the power distribution contact system ensures that the current is continuously routed through the distribution bus arrangement and finally fed to devices for customer cable termination. The power distribution contact system is a

8

modular system. Hence the same system is used for quarter-width as well as half-width feeder modules.
E) BRIEF DESCRIPTION OF THE DRAWINGS:
[0026] The other objects, features and advantages will occur to those skilled in the art from the following description of the preferred embodiment and the accompanying drawings in which:
[0027] FIG. 1 illustrates a front side perspective view of an electrical power contact system in distribution bus arrangement for fractional feeder modules according to one embodiment of the present invention.
[0028] FIG. 2 illustrates a top side front perspective view of a section of an electrical power distribution bus arrangement in an electrical power contact system for fractional feeder modules according to one embodiment of the present invention.
[0029] FIG. 3 illustrates a back side perspective view of an electrical power contact system in the distribution bus arrangement for fractional feeder modules according to one embodiment of the present invention.
[0030] FIG. 4 illustrates a back side top perspective view of an electrical power contact system in the distribution bus arrangement for fractional feeder modules according to one embodiment of the present invention.
[0031] FIG.5 illustrates a front side perspective view of a main contact plate in the outgoing side contact system at the electrical contact system in the distribution bus
9

arrangement for the fractional feeder modules according to one embodiment of the present invention.
[0032] FIG. 6 illustrates a backside perspective view of a feeder module to be attached to an electrical power contact system in the distribution bus arrangement for the feeder modules according to one embodiment of the present invention.
[0033] FIG. 7 illustrates a side perspective view of an electrical contact system in the distribution bus arrangement for the fractional feeder modules with the fractional feeders in attached condition, according to one embodiment of the present invention.
[0034] Although the specific features of the present invention are shown in some drawings and not in others. This is done for convenience only as each feature may be combined with any or all of the other features in accordance with the present invention.
F) DETAILED DESCRIPTION OF THE INVENTION
[0035] In the following detailed description, a reference is made to the accompanying drawings that form a part hereof, and in which the specific embodiments that may be practiced is shown by way of illustration. These embodiments are described in sufficient detail to enable those skilled in the art to practice the embodiments and it is to be understood that the logical, mechanical and other changes may be made without departing from the scope of the embodiments. The following detailed description is therefore not to be taken in a limiting sense.

10

[0036] The various embodiments of the present invention provide a power contact system for distributing power into and out of the fractional feeder modules of the switchboards. According to one embodiment of the present invention, an electrical contact system in the distribution bus system for fractional feeder modules in switchboards is provided with an incoming side contact system connected to vertical bus bar to draw the electrical power from the mains. The current carrying connectors are connected to the incoming side contact system. An outgoing side contact system is connected to the current carrying connectors to supply an input electrical power to the fractional feeder modules and to receive the output electrical power from the fractional feeder modules. The output electrical power from the feeder modules are fed to the end load devices through the cable termination connected to the current carrying connectors.
[0037] The Fractional feeder modules are connected to the outgoing side contact system. The outgoing side contact system has a first set of electrical contacts arranged in a first row to supply the incoming electrical power to the fractional feeder modules and a second set electrical contacts arranged in a second row to receive the electrical power from the fractional feeder modules to supply the electrical power to the end load devices.
[0038] The outgoing side contact system provides an interface between the distribution bus system and the fractional feeder modules. The outgoing side contact system has main contacts and auxiliary contacts for mating with the main contacts and the auxiliary contacts mounted on the fractional feeder modules. The outgoing side contact system has a main contact plate provided with main contacts that are mated

11

with the main contacts in the fractional feeder modules. The main contacts in the outgoing side contact system are arranged in two rows in the main contact plate to supply the electrical power to the fractional feeder modules and to receive the electrical power from the fractional feeder modules respectively. The main contact plate is provided with plurality of projections to provide a blind mating contact between the main contacts of the outgoing contact system and the main contacts of the fractional feeder modules.
[0039] The auxiliary contacts are provided in the auxiliary contact plate in the outgoing side contact system to mate with the auxiliary contacts in the fractional feeder modules. The auxiliary contact plate is provided with plurality of projections to provide a blind mating contact between the auxiliary contacts of the outgoing contact system and the auxiliary contacts of the fractional feeder modules.
[0040] The fractional feeder module is provided with plurality of locators which are received into the projections provided in the main contact plate and the auxiliary contact plate at the outgoing side contact system to provide a blind mating contact between the main contacts of the outgoing side contact system and the main contacts of the fractional feeder modules and also between the auxiliary contacts of the outgoing contact system and the auxiliary contacts of the fractional feeder modules. The fractional feeder modules are provided with locators such that the main contacts and the auxiliary contacts in the fractional feeder modules absorb the mismatch over all the contact positions in orthogonal directions, individually. The fractional feeder module is a full width module or a half width module or a quarter width module,

12

[0041] The incoming side contact system is arranged with contacts in such a manner that the individual contacts housed within the incoming side contact system swivel sidewise during the insertion vertical bus bars to absorb the specified mismatch.
[0042] According to one embodiment of the present invention, the power contact system includes a contact system on incoming power side, a contact system on feeder module side, a distribution bus arrangement which carries current between the contact systems and one or more feeder modules.
[0043] The contact system on incoming power side includes one or more individual contacts housed within the contact system. The individual contacts are mounted horizontally on the contact system on incoming power side and protruded outwardly. Each individual contact includes a power contact and a contact place for holding the main distribution vertical bus bars. The individual contacts absorb specified mismatch of mating contacts by swivelling sidewise during the insertion of the vertical main distribution bus bars. Thus the individual contacts are easily contacted well to the vertical main distribution bus bars without any mismatching of mating contacts during the insertion. When the contact system on incoming power side is connected to the vertical main distribution bus bars, the individual contacts draw current from vertical main distribution bus bars and carry the current to the distribution bus arrangement.
[0044] The distribution bus arrangement includes one or more bus strips which are mounted lengthwise as well as horizontally. The distribution bus arrangement carries the current from the contact system on incoming power side to the contact system on feeder module side through copper flex braids.

13

[0045] The contact system on the feeder module side includes one or more power contacts and one or more auxiliary contacts or secondary isolating contacts (SICs) for each fractional module. The power contacts are mounted on a power contact plate in the contact system on feeder module side. Each power contact plate and each auxiliary contact plate are provided with one or more cylindrical locators that are used to absorb any mismatch of over-all contact position of mating contacts in orthogonal directions, when the fractional feeder module is inserted with the contact system on the feeder module side.
[0046] When the contact system on the feeder module side is connected to the feeder module, one set of power contacts of the contact system on feeder module side carries current from the distribution bus arrangement to the incoming contacts of the feeder module. Another set of power contacts of the contact system on feeder module side receives the output current from the outgoing contacts of the feeder module and feeds the output current from the feeder modules to the end load devices through the distribution bus arrangement.
[0047] Thus the power contact system ensures that the current is continuously routed through the distribution bus arrangement and finally fed to devices for customer cable termination. The power contact system is a modular system. Hence the same system is used for quarter-width as well as half-width feeder modules.
[0048] FIG.l illustrates a front side perspective view of an electrical power contact system in distribution bus arrangement for fractional feeder modules according to one embodiment of the present invention.
14

With respect to FIG. 1, the power distribution contact system 100 includes a contact system on incoming power side 102, a contact system on the feeder module side 104 and a distribution bus arrangement 106. The contact system on the incoming power side 102 and the contact system on feeder module side 104 are connected through the distribution bus arrangement 106. The distribution bus arrangement 106 carries current between the contact system on the incoming power side 102 and the contact system on the feeder module side 104.
[0049] The contact system on the incoming power side 102 includes one or more individual contacts 108 which are mounted in horizontally and protruded outwardly. Each individual contact 108 includes a power contact and a contact place for holding the vertical main distribution bus bars. When the contact system on the incoming power side 102 is inserted into the vertical main distribution bus bars, each individual contact 104 absorbs the specified mismatch of the mating contacts by swivelling sidewise and the alignment of the mating contacts takes place. Thus the vertical main distribution bus bars are matched in the contact place of the individual contact 104. After the establishment of the connection between the contact system on the incoming power side 102 and the vertical main distribution bus bars, the individual contacts 104 carry current from the vertical main distribution bus bars to the distribution bus arrangement 106 through the power contacts.
[0050] FIG. 2 illustrates a top side front perspective view of a section of an electrical power distribution bus arrangement in an electrical power contact system for fractional feeder modules according to one embodiment of the present invention. With respect to FIG. 2, the distribution bus arrangement 106 includes one or more bus strips 202 mounted lengthwise as well as horizontally. Further the bus strips 202 are

15

perpendicular to the contact system on feeder module 104. The bus strips 202 are connected to the contact system on the incoming power side and the contact system on the feeder module side 104 through copper flex braids. During the power distribution between the contact system on incoming power side and the contact system on the feeder module side 104, the current is drawn from the individual contacts of the contact system on the incoming power side and fed to the power contacts of the contact system on feeder module side 104 through the bus strips 202.
[0051] FIG. 3 illustrates a back side perspective view of an electrical power contact system in the distribution bus arrangement for fractional feeder modules according to one embodiment of the present invention, while the FIG. 4 illustrates a back side top perspective view of an electrical power contact system in the distribution bus arrangement for fractional feeder modules according to one embodiment of the present invention. With respect to FIG. 3 and 4, the contact system on the feeder module side 104 is mounted vertically in the power distribution contact system 100. The contact system on the feeder module side 104 serves as an interface between the distribution bus arrangement 106 on one side and the current carrying fractional feeder modules on the other side. The contact system on the feeder module side 104 includes a power contact plate 302 and an auxiliary contact plate 304. The power contact plate 302 includes one or more power contacts 402. One set of power contacts 402 is used to carry the current from the distribution bus arrangement 106 to the incoming contacts of the feeder modules. Another set of the power contacts 402 is used to receive the current from out-going contacts of the feeder modules to the load devices through the distribution bus arrangement 106 using cables. The auxiliary contact plate 304 provides provision to accommodate one or more auxiliary contacts which are mounted on the feeder modules.
16

[0052] During the power distribution between the distribution bus arrangement 106 and the feeder module, one set of power contacts 402 of the contact system on the feeder module side 104 draws the current from the distribution bus arrangement 106 and feeds the current to the incoming side contacts of the feeder module. Further another set of the power contacts 402 draws the output current from the out-going contacts of the feeder module and feeds the output power to the distribution bus arrangement 106. Then the output current is finally fed to the customer devices through cable termination.
[0053] FIG.5 illustrates a front side perspective view of a main contact plate in the outgoing side contact system at the electrical contact system in the distribution bus arrangement for the fractional feeder modules according to one embodiment of the present invention. With respect to FIG. 5, the power contact plate 302 of the contact system on the feeder module side includes the power contacts 402 mounted in the power contact plate 302 and one or more phase barriers 502. Each power contact 402 is enclosed in a power contact cap 504 for protection. The power contact plate 302 is provided with one or more cylindrical locators 506. When the fractional feeder module is inserted into the contact system, the cylindrical locators 506 are used to absorb the mismatch over all the contact positions of mating contacts in orthogonal directions. Hence the alignment of the mating contacts takes place. Thus the requirements of isolation between the adjacent contacts and the mismatch requirements between the individual set of mating contacts are achieved in the power distribution contact system.
17

[0054] FIG. 6 illustrates a backside perspective view of a feeder module to be attached to an electrical power contact system in the distribution bus arrangement for the feeder modules according to one embodiment of the present invention. With respect to FIG. 6, the feeder module 600 includes a contact housing 602, one or more power contacts 604 mounted on the contact housing 602, an auxiliary contact plate 606 housing one or more auxiliary contacts 608 and one or more cylindrical projections 6101 and 6102. When the feeder module 600 is inserted to the contact system on feeder module side, the cylindrical projections 6101 and 6102 are matched with the corresponding cylindrical locators of the contact system on feeder module side. Hence the power contacts 604 are mated with the equivalent power contacts of the contact system on feeder module side and the auxiliary contacts 608 are mated with the corresponding auxiliary contacts provided in the auxiliary contact plate in the contact system on the feeder module side.
[0055] FIG. 7 illustrates a side perspective view of an electrical contact system in the distribution bus arrangement for the fractional feeder modules with the fractional feeders in attached condition, according to one embodiment of the present invention. With respect to FIG. 7, when the feeder module 600 is inserted to the contact system on the feeder module side 104, the cylindrical locators 506 provided on the contact system on the feeder module side 104 receive the cylindrical projections 6101 and 6102 provided on the feeder modules to provide a blind mating contact between the contacts provided in the feeder modules and the contacts provided at the contact system on the feeder module side. Hence the power contacts 604 of the feeder module 600 are mated with the equivalent power contacts 402 of the contact system on feeder module side 104 and the auxiliary contacts of the feeder module 600 are mated with the equivalent auxiliary contact plate provisions of the contact system on feeder
18

module side 104. Thus any mismatch between the mating contacts is absorbed and the mismatch requirements between the individual set of mating contacts are achieved in the power distribution contact system.
G) ADVANTAGES OF THE INVENTION
[0056] The various embodiments of the present invention provide a power distribution contact system for distributing power into and out of the fractional feeder modules of MCC switchboards. The power distribution contact system adheres to the requirements of isolation between the adjacent contacts. Also the power distribution contact system absorbs the mismatch between the individual set of mating contacts and the mismatch during the mating of power contacts with vertical distribution bus bars.
[0057] Further the contact system in the power contact system is modular and is used for quarter-width as well as half-width feeder modules. The power distribution contact system provides continuity of current while achieving the isolation and mismatch requirements.
[0058] Although the invention is described with various specific embodiments, it will be obvious for a person skilled in the art to practice the invention with modifications. However, all such modifications are deemed to be within the scope of the claims.
[0059] It is also to be understood that the following claims are intended to cover all of the generic and specific features of the present invention described herein and all

19

the statements of the scope of the invention which as a matter of language might be said to fall there between.
Dated this the 30m day of July 2009
RAKESH PRABHU Patent Agent,
ALMT Legal,
#2, Lavelle Road, Bangalore-560 001
To,
The Controller of Patents, The Patent Office, Mumbai

20

CLAIMS
What is claimed is:
1. An electrical contact system in distribution bus system for fractional feeder
modules in switchboards comprising:
An incoming side contact system;
Current carrying connectors connected to the incoming side contact system;
An outgoing side contact system connected to the current carrying connectors;
and
Fractional feeder modules connected to the outgoing side contact system;
Wherein the outgoing side contact system has a first set of electrical contacts
arranged in a first row to supply the incoming electrical power to the fractional
feeder modules and a second set electrical contacts arranged in a second row
to receive the electrical power from the fractional feeder modules to supply the
electrical power to the end load devices.
2. The system according to claim 1, the outgoing side contact system provides an interface between the distribution bus system and the fractional feeder modules.
3. The system according to claim 1, wherein the outgoing side contact system has main contacts and auxiliary contacts for mating with the main contacts and the auxiliary contacts mounted on the fractional feeder modules.
4. The system according to claim 1, wherein the outgoing side contact system has a main contact plate provided with main contacts that are mated with the main contacts in the fractional feeder modules.
21

5. The system according to claim 1, wherein the main contacts in the outgoing side contact system are arranged in two rows in the main contact plate to supply the electrical power to the fractional feeder modules and to receive the electrical power from the fractional feeder modules respectively.
6. The system according to claim 1, wherein the auxiliary contacts are provided in the auxiliary contact plate in the outgoing side contact system to mate with the auxiliary contacts in the fractional feeder modules.
7. The system according to claim 1, wherein the main contact plate is provided with plurality of projections to provide a blind mating contact between the main contacts of the outgoing contact system and the main contacts of the fractional feeder modules.
8. The system according to claim 1, wherein the auxiliary contact plate is provided with plurality of projections to provide a blind mating contact between the auxiliary contacts of the outgoing contact system and the auxiliary contacts of the fractional feeder modules.
9. The system according to claim 1, wherein the fractional feeder module is provided with plurality of locators which are received into the projections provided in the main contact plate and the auxiliary contact plate at the outgoing side contact system to provide a blind mating contact between the main contacts of the outgoing side contact system and the main contacts of the fractional feeder modules and also between the auxiliary contacts of the outgoing contact system and the auxiliary contacts of the fractional feeder modules.

22

10. The system according to claim 1, wherein the incoming side contact system is arranged with contacts in such a manner that the individual contacts housed within the incoming side contact system swivel sidewise to absorb the specified mismatch.
11. The system according to claim 1, wherein the fractional feeder modules are provided with locators such that the main contacts and the auxiliary contacts in the fractional feeder modules absorb the mismatch of over-all the contact position in orthogonal directions, individually.

12. The system according to claim 1, wherein the fractional feeder module is a full width module.
13. The system according to claim 1, wherein the fractional feeder module is a half width module.
14. The system according to claim 1, wherein the fractional feeder module is a quarter width module.
15. The system according to claim 1, wherein the outgoing side contact system
has cable termination for feeding current to the end devices.

Place: Bangalore RAKESH PRABHU
Date: 30 July 2009 Patent Agent

23