FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
As amended by the Patents (Amendment) Act, 2005
AND
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2005
COMPLETE SPECIFICATION (See section 10 and rule 13)
TITLE OF THE INVENTION
High current rated terminal box with multi-bus ducts entry
APPLICANTS :
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR (S):
Wadbude Sahebrao, of Crompton Greaves Ltd, machine (M7) Division, D-5 Industrial Area, MPAKVN, Mandideep-462046, Madhya Pradesh, India, an Indian National.
PREAMBLE TO THE DESCRIPTION:
The following specification particularly describes the nature of this invention and the manner in which it is to be performed:

Field of the Invention:
This invention relates to the field of motors and transformers.
Particularly, this invention relates to the field of power supply for motors and transformers.
More particularly, this invention relates to high current rated terminal box with multi-bus ducts entry.
Background of the Invention:
A motor for electrical purposes, i.e. an electric motor, is a device which converts electrical energy to mechanical energy. For industrial use, the ratings of motor may typically be very high. It may be fitted with terminal boxes.
Current demands of the market are to provide Low Tension (LT) motors of very high capacity. Commercial development of such motors is almost non-existent, currently. Low Tension motors have very higher current value. This is in the range of about 3000 Amp to about 12000 Amp.
Currently existing terminal boxes are rated to handle current capacity of about 800Amps to about 1400 Amps (maximum).
If a motor is to be developed for a higher current rating, then multiple terminal boxes will have to be used. This increases the cost of the entire motor, and makes it a voluminous assembly with a plurality of messy wires. It also leads to a

cumbersome assembly, as there are engineering problems relating to placing multiple terminal boxes on the motor, and drawing multiple wires, thereto.
There is a similar need for transformers with high current rating which require high current rated terminal boxes.
Objects of the Invention:
An object of the invention is to provide a terminal box for a motor or transformer to provide power supply to a motor or transformer having very high current rating.
An object of the invention is to provide a relatively smaller terminal box for a motor or transformer to provide power supply to a motor or transformer having very high current rating.
Another object of the invention is to provide a relatively smaller terminal box for a motor or transformer to provide power supply to a motor or transformer having very high current rating and providing IP-55 type of protection.
Yet another object of the invention is to provide a 3-phase terminal box for a motor or transformer to provide power supply to a motor or transformer having very high current rating.
Summary of the Invention:
According to this invention, there is provided a high current rated terminal box, said box comprises:

a. first set of bus bars, having pre-defined surface area, placed parallel with
respect to each other, said set including three bus bars spaced apart from
each other and adapted to receive a single phase of a three phase supply,
each of said bus bars having a first end being the free end and a second end
adapted to mate with other bus bars; phase-wise;
b. second set of bus bars, having pre-defined surface area, located orthogonal
and spaced apart with respect to said first set of bus bars, said set including
three bus bars spaced apart from each other, said second set spaced apart
from said first set of orthogonally placed first set of bus bars, each of said
second set being parallel to each other and adapted to receive a single phase
of a three-phase supply, each of said bus bars having a first end being the
free end and a second end adapted to mate with other bus bars; phase-wise;
c. third set of bus bars, having pre-defined surface area, located orthogonal and
spaced apart with respect to said first set of bus bars but parallel and spaced
apart with respect to said second set of bus bars, each of said second set
being parallel to each other and adapted to receive a single phase of a three-
phase supply, each of said bus bars having a first end being the free end and
a second end adapted to mate with other bus bars; phase-wise; and
d. plurality of collar bar adapted to connect each of said first set of bars to said
second set of bars at each of their second ends;
wherein, said third set of bus bars connect to said second set of bus bars at their second ends, said bus bars adapted to allow power cables to be terminated on them, individually; phase-wise, thereby providing a phase-wise summation of power in said power cables from three different sets of bus bars and providing multiple duct entry for cables from different directions in accordance with placement of each of said sets of bus bars.

Typically, said first set of bus bars are main current (high) rated bus bars.
Typically, said second set of bus bars are auxiliary current (relatively lower) rated bus bars.
Typically, said third set of bus bars are supplementary current (relatively lowest) rated bus bars.
Typically, said collar bar is a Copper (Cu) link.
Brief Description of the Accompanying Drawings:
Figure 1 illustrates a first terminal box of the prior art;
Figure 2a illustrates a top view (without lid) of a second terminal box of the prior
art; and
Figure 2b illustrates a sectional view of the terminal box of Figure 2a.
This invention will now be described in relation to the accompanying drawings, in which:
Figure 3 illustrates a high current rated terminal box.
Detailed Description of the Accompanying Drawings:
Figure 1 illustrates a first terminal box of the prior art. This terminal box is used from the range of 600 Amps to 800 Amps. Reference numeral 12, 14, 16 refer to

ducts on which cable wires terminate. The cable wires are 3-phase wires and hence, three ducts are provided in the terminal box; each for receiving a cable wire.
Figure 2a illustrates a top view (without lid) of a second terminal box of the prior art. Figure 2b illustrates a sectional view of the terminal box of Figure 2a.
Reference numeral 1 refers to the lid of the terminal box (3). There is a terminal bar (5) in the terminal box (3) with supports (4). These terminal bars are 3 in number (5A, 5B, 5C) for receiving distinct power supply cables for R, Y, and B-phases respectively. Reference numeral 6 refers to machine cable socket extending from the terminal bar (5). Reference numeral 7 refers to the cable socket from the customer side of the terminal box. Power cables (2) may enter from one side for termination on to the terminal bars. Thus, for every phase there are multiple wires. The size of the terminal box is dependent upon the number and rating of wires. High current rating wires need to have smooth bending through its length in order to guide it for termination. This smooth termination leads to increase in size of the terminal box. The wires, in any case, may have a tendency to entangle. Hence, there is a need for a cleaner, yet compact, terminal box for still higher current ratings.
According to this invention, there is provided a high current rated terminal box with multi-bus ducts.
Figure 3 illustrates a high current rated terminal box (100) for LT motor (50) or transformer.

In accordance with an embodiment of this invention, there is provided a first set (32) of bus bars placed parallel with respect to each other. The set includes three bus bars spaced apart from each other. The three bus bars are for three-phase power supply; each for one phase. The first set of bus bars have a first end being the free end a second end which mates with other bus bars; phase-wise.
The first set of bus bars are for main current (high).
In accordance with another embodiment of this invention, there is provided a second set (34) of bus bars located orthogonal but spaced apart with respect to the first set of bus bars. The set includes three bus bars spaced apart from each other and also spaced apart from the first set of orthogonally placed first set of bus bars. The bus bars from the second set are also parallel to each other. The three bus bars are for three-phase power supply; each for one phase. The second set of bus bars have a first end being the free end a second end which mates with other bus bars; phase-wise.
The second set of bus bars are for auxiliary current (relatively lower).
In accordance with yet another embodiment of this invention, there is provided a third set (36) of bus bars located orthogonal and spaced apart with respect to the first set of bus bars but parallel and spaced apart with respect to the second set of bus bars. The bus bars from the third set are also parallel to each other. The three bus bars are for three-phase power supply; each for one phase. The third set of bus bars have a first end being the free end a second end which mates with other bus bars; phase-wise.

The third set of bus bars are for supplementary current (relatively lowest).
There is provided a plurality of collar bar (38) adapted to connect each of said first set of bars to said second set of bars at each of their second ends. Further, the third set of bus bars connect to the second set of bus bars at their second ends. Wires are terminated on each of the bus bars, individually; phase-wise. Due to the multiple orthogonally placed bus bars, each set provides room / ducts from various sides of the terminal box, thereby providing a tangle-free terminal box in order to provide a 'multi-bus' terminal box having multiple entries for cables / wires. Collar bar is Copper (Cu) link.
Since, the first set of bus bars, the second set of bus bars, the third set of bus bars, are all connected, phase-wise, summation of currents take place, phase-wise, to form and supply a high rating of current than what cables can supply.
This terminal box with multi bus duct entry can be used for higher range of Motors and transformers. This is a relatively small size terminal box with high capacity of current and also suitable for type of protection IP-55.
This terminal Box and Cu link is designed with minimum size and is joint-less. Joints are very critical since, their presence leads to heat generation.
Still further, if the current capacity is to be increased without increase in size, the surface area of the bus bars can be increased.

The cost of this terminal box is similar to the cost of a smaller conventional terminal box of Figure 1 of the accompanying drawings.
While this detailed description has disclosed certain specific embodiments of the present invention for illustrative purposes, various modifications will be apparent to those skilled in the art which do not constitute departures from the spirit and scope of the invention as defined in the following claims, and it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

We claim,
1. A high current rated terminal box with multi-bus ducts, said box comprising:
a. first set of bus bars, having pre-defined surface area, placed parallel with
respect to each other, said set including three bus bars spaced apart from
each other and adapted to receive a single phase of a three phase supply,
each of said bus bars having a first end being the free end and a second end
adapted to mate with other bus bars; phase-wise;
b. second set of bus bars, having pre-defined surface area, located orthogonal
and spaced apart with respect to said first set of bus bars, said set including
three bus bars spaced apart from each other, said second set spaced apart
from said first set of orthogonally placed first set of bus bars, each of said
second set being parallel to each other and adapted to receive a single phase
of a three-phase supply, each of said bus bars having a first end being the
free end and a second end adapted to mate with other bus bars; phase-wise;
c. third set of bus bars, having pre-defined surface area, located orthogonal and
spaced apart with respect to said first set of bus bars but parallel and spaced
apart with respect to said second set of bus bars, each of said second set
being parallel to each other and adapted to receive a single phase of a three-
phase supply, each of said bus bars having a first end being the free end and
a second end adapted to mate with other bus bars; phase-wise; and
d. plurality of collar bar adapted to connect each of said first set of bars to said
second set of bars at each of their second ends;
wherein, said third set of bus bars connect to said second set of bus bars at their second ends, said bus bars adapted to allow power cables to be terminated on them, individually; phase-wise, thereby providing a phase-wise summation of

power in said power cables from three different sets of bus bars and providing multiple duct entry for cables from different directions in accordance with placement of each of said sets of bus bars.
2. A terminal box as claimed in claim 1 wherein, said first set of bus bars are main current (high) rated bus bars.
3. A terminal box as claimed in claim 1 wherein, said second set of bus bars are auxiliary current (relatively lower) rated bus bars.
4. A terminal box as claimed in claim 1 wherein, said third set of bus bars are supplementary current (relatively lowest) rated bus bars.
5. A terminal box as claimed in claim 1 wherein, said collar bar is a Copper (Cu) link.