CA1087721A - Bus bar assembly for distribution loadcentres - Google Patents
Bus bar assembly for distribution loadcentresInfo
- Publication number
- CA1087721A CA1087721A CA278,524A CA278524A CA1087721A CA 1087721 A CA1087721 A CA 1087721A CA 278524 A CA278524 A CA 278524A CA 1087721 A CA1087721 A CA 1087721A
- Authority
- CA
- Canada
- Prior art keywords
- bus bar
- stabs
- distribution
- conductive sheet
- sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/20—Bus-bar or other wiring layouts, e.g. in cubicles, in switchyards
- H02B1/21—Bus-bar arrangements for rack-mounted devices with withdrawable units
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Distribution Board (AREA)
Abstract
BUS BAR ASSEMBLY FOR DISTRIBUTION LOADCENTRES
ABSTRACT OF THE DISCLOSURE
This invention relates to a bus bar assembly for a distribution panelboard. The bus bar member can be easily formed by a punch press machine which punches holes in a flat rectangular shaped member leading U-shaped peninsulae therein.
The peninsulae formed by the holes are then folded which re-sults in stabs being formed at right angles with the flat member Depending on the number of phases to be serviced a number of bus bar members can be arranged one above the other.
This novel bus bar assembly has the advantage over the previous designs in that it affords optimal accessibility to other components within the distribution panelboard.
ABSTRACT OF THE DISCLOSURE
This invention relates to a bus bar assembly for a distribution panelboard. The bus bar member can be easily formed by a punch press machine which punches holes in a flat rectangular shaped member leading U-shaped peninsulae therein.
The peninsulae formed by the holes are then folded which re-sults in stabs being formed at right angles with the flat member Depending on the number of phases to be serviced a number of bus bar members can be arranged one above the other.
This novel bus bar assembly has the advantage over the previous designs in that it affords optimal accessibility to other components within the distribution panelboard.
Description
RELATED CROSS-REFERE`.CE
Canadian Patent Application S. M. 229.119 entitled "Loadcentre Having a Dual Purpose ~Jeutral Rail"~ filed June 11~
1975 by Coles et al is related to this application and assigned to the assi~nee of this invention BACKGROU~D
In the past, panelboards of lower power ratings such as would be found in domestic residences have generally had a configuration which is more or less standard in the electrical industry Electrical power is fed by means of insulated conducting cables through the walls of the panelboard to a main circuit breaker The main circuit breaker is usually connected to stabs found at the uppermost area of the bus bar assembly. The main circuit breaker transfers the incoming current to the stabs which in turn feeds the current via the "live" bus bar to stabs found at the lower portion of the bus bar assembly. Smaller capacity circuit breakers are 10~721 connected to these lower portlon stabs in order to control and monitor the flow of current to the distribution circuits.
The incoming neutral conductors are usually connected to a neutral rail located at either the top or bottom portion of the distribution panelboard.
In particular, previous bus bar assembly designs, such as described in Canadian Patent 989,o58 issued to K. R. Coley on May 11, 1976, comprlse two elongated flat bus bar members electrically isolated and mechanically supported by an insulating support member. Each bus bar member consists of a flat elongated main body from which extend a plurality of stabs. The insulating support member is a flat elongated sheet having stab receiving slots dlsplaced along both lengthwi~e edges. The bus bar asæembly iæ formed by fitting the stabæ
of each bus bar member into the stabs recelvlng slots of the insulating support member æo that the bus bar memberæ are poæitioned on oppoæite sides of the support member. Because the design requires an in8ulating support member sturdy enough to support the bus bar members, the insulating member iæ not very flexlble which may give rl~e to eaæy breakage. Moreover, the surface area required by the flat lnsulating support member and the two flat bus bar members of thiæ deslgn does not af~ord optimal accessibility to other components within the distrlbution panelboard.
_UMMARY OF THE INVENTION
This invention relateæ to a novel buæ bar assembly within a panelboard ætructure wherein circuit breakeræ are uæed to control and monitor incoming current into the panel-board, as well aæ the current flowing out of the diætribution panelboard to various loadæ. The incoming power iæ fed from the lncoming conductoræ to a main circuit breaker uæually lQ877Zl located at the top of the bus bar assembly. The power i8 transferred by way of the bus bar aæsembly to the distribution clrcult breakers. The dlstributlon circult breaker~ are generally mounted on the lower section of the bus bar assembly by securing one end of the breaker to a hook located on a neutral rail and connecting the other end o~ the breaker to the "live" bus by means of a screw or stab connection.
The incoming and outgoing neutral conductor cable~
are connected to the neutral rail. The panelboard i8 similar ln appearance to the aformentioned Canadian Patent Application S. N. 229,119, but the bus bar assembly Or this lnvention dirfers from the aforementloned Appllcation as described herebelow.
In particular, this lnvention relates to a distribution panelboard including a bus bar member. m e bus bar member includes a substantially flat elongated conductive sheet having a pluralitg of substantially e~enly spaced apertures contained therein arranged along the longitudinal axls of the sheet.
A plurality of ~lmilar shaped planer stabs extend substantially orthogonally from the sheet. Each of the stabs is allocated to one of the apertures so that each aperture has ad~acent thereto one stab and the plane o~ the stab is transverse to the longitudinal axls of the sheet. The stabs have a width less than the aperture wlath.
The bus bar member is mounted on the insulating support member in a suitable manner and provides for the distribution of the incoming power to the distribution circuit breakers.
It should be understood that the bus bar assembly 3 may consist of two or more elongated bus bar members arranged in ~he manner subsequently descrlbed. It is proposed that ~or a bus bar assembly to service two incoming 'llive" power 772~
lines, two bus bar members are positioned side by side with each stab of the second bus bar member passing through a corresponding aperture of the first bus bar member. The length of the protruding stabs of the firæt bus bar member may be shortened so that when the two bus bar members are place~ in this collateral arrangement the stabs of both members protrude a substantially equal dlstance from the face of the first bus bar member. Suitable dielectric materlal is provlded to effectlvely electrically isolate the two bus bar members. One method of providing the necessary electrical insulation is to position a flat elongated insulation member between the bus bar members such that the stabs of the lower bus bar pass through apertures in the insulation member and the aligned apertures in the upper bus bar. This insulation member is constructed from an electrically non-conductive materlal such as NOMEX (a trademark). Another method of insulation may con~ist o~ an electrically non-conductive material such as Scotchgard 260 (a trademark) coated on the ~heets of each bus bar member by a fluidized bed epoxy process. Insulatlon may be provided by uslng both the coated material and the insulation member. It should be understood that lnsulation may be applied to the bus bars by a variety of other methods.
Distribution circuit bre~kers are connected to the stab connectors o~ the bus bar assembly in a manner similar to that of the main breakers This bus bar assembly is relatively easy to manufacture and re~uires substantially lesæ surface area within the distri-bution panelboard than prior art designs. In this panelboard design the insulation provided between bus bar members does not have to provide any mechanical support for the bus bar members as in prior art designs Installation and maintenance 7~Zl operations performed on distribution panelboards of this construction are made easier due to the compactness of this bus bar assembly.
BRIEF DESCRIPTION OF THE DRAWINGS
Flgure 1 shows one embodiment of the bus bar assembly for a single phase three wire distribution panelboard.
Flgure 2 ls a more detailed vlew of the bus bar assembly shown in Fig. 1.
Flgure 3 ls an exploded view of the upper insulating support member of Flgure 1.
Figure 4 ls a sectlonal slde vlew showlng a bus bar assembly capable of servicing a 3 phase system.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Re~errlng now to Fig. 1, one embodiment of the inventlon ls shown for two bus bar members. Other embodlments of the inventlon may lnclude more than two bus bar members dependlng on the number of phases the distrlbution panelboard assembly ls requlred to service. A metalllc box-llke enclosure 10 ~s provlded ln Flg. 1 wlth three mountlng locatlons shown at 12. The three mountlng locations 12 permlt the enclosure 10 to be mounted to a suitable mountlng surface. Knock out punches 14 are provided on the top, bottom and both slde surfaces of the enclosure to provide access openlngs for the passage of conductors therethrough.
Mounted within enclosure 10 ls a clrcult breaker and panel assembly 16. Bus bar assembly 18 wlll be mounted on insulatlng support member 20 by means of rlvets 22. Support member 20 will be mounted to the enclosure 10 by studs 24 and nuts 26. A sheet of insulating material 28 lles between encloæure 10 and support member 20. Two slde ralls 30 are connected to support member 20 in a su~table manner such as rivets 32. Slde rails 30 may be constructed from a suitable electrically conductive material, such as extruded aluminium.
lOB7721 Side rails 30 are provided with holes 34 and ~crews 36 to which neutral electrically conducting wire may be connected.
Hooks 38 on side rails 30 secure circuit breakers 40 as shown The mechanical structure of rails 30 is described further in the aforementloned Canadian Application.
Electrlcal conducting bar 42 connects rails 30 together at the top of panel assembly 16 by means of screws 44, as shown in Fig. 1. Terminal connectors 46 and 48, shown on bar 42, provide an electrlcal connection for the incoming neutral conducting wire. Connectors 46 and 48 may slide along bar 42 to any desired position.
Referring now to Fig. 1 and Fig. 2, the essentlal features for thls embodiment of the invention are shown at 18. The bus bar assembly comprises two rectangular bus bar ~heets 70 and 71 from which respectlvely protrude a plurality of stabs 72 and 73. The sheets 70 and 71 are constructed from a suitable electrically conductive material, such as aluminum. Stab~ 73 are formed by punching out a plurality o~ holes which leave a plurality of U-shaped penlnsulae in ~heet 71. The peninsulae formed when the holes are punched out are then bent to form stabs 73 which extend orthogonally from sheet 71~ The formation of stabs 73 results in substantially rectangular apertures 77 being produced. Stabs 72 are formed from sheet 70 in a manner similar to the formation of stabs 73 so that apertures 76 are produced.
An electrically insulating epoxy material, such as Scotchgard 260 (a trademark) is coated on the flat conductive sheets by a fluidized bed process. An alternate means of insulation between the two bus bar sheets is to posltion an 3 insulating member 80 between sheets 70 and 71. Insulating member 80 may be constructed from an electrically non-conductive ln~77zl material such as NOMEX (a trademark~. The insulatlng member 80 is preferably a flat rectangular sheet wherein a plurality of spaced rectangular openings are provided. The openings will be of sufficient size to permit stabs 72 of the lower bus bar member 70 to pass therethrough.
The bus bar assembly 18 is constructed by placing sheet 71 on top of sheet 70 with insulating member 80 there-between. Stabs 72 of sheet 70 extend through the openings of insulating member 80 and the apertures 77 of sheet 71.
The bus bar sheet 71 i8 positioned on top of insulating member 80 which in turn is positioned on top of the sheet 70 forming bus bar assembly 18. Assembly 18 is mounted to ~upport 20 by rivets 22 as shown in Figures 1 and 2. Rivets 22 extend through a hole in sheet 71 and aperture 76 in sheet 70 into support 20. Due to the size of aperture 76, there is no electrical contact between sheets 70 and 71.
It may be desirable to have the stabs 72 and 73 extending a substantially equal dlstance from the surface Or bus bar sheet 71. This being the case, stabs 73 Or upper bu~ bar sheet 71 may be shortened accordingly.
Figure 3 shows a detailed view of the upper insulating support member 20 of Flg. 1. Spacers 50 and 52 are provlded to locate the upper and lower bus bar sheets, respectively, as well as insulating member 80. Spacer 50 locates upper bus bar sheet 71 by passing through one aperture of each of the plurality of apertures 76, 77, and one of the apertures of the insulating member 80. Spacers 52 locate the lower bus bar sheet 70 by passing through one aperture Or apertures 76 of lower bus bar sheet 70. The lower bus bar sheet rests on supports 54 above ~ace 56.
A bus bar assembly required to service a three phase system can readily be accommodated by insulating support m~77zl member 20. T~e flrst and second bus bar sheets sre located ln the same manner as set out above. A third bus bar sheet ma~ be located beneath the seccnd sheet by fitting supports 54 lnto pre-cut circular grooves in the third sheet such that the third sheet lies between supports 54. The pre-cut circular grooves can be cut in such a manner so as to locate the third sheet relative to the flrst and second sheets so that stabs of the third sheet extend through the apertures in the first and second sheets as well as the apertures in insulating members.
Insulation between the third sheet and the second sheet requires an insulation member similar to insulating member 80 between the first and second sheets which is located by supports 54 in a manner similar to the third sheet.
It should be further understood that the width of the bus bar sheets may be increased or decreased thereb~
respectively increasing or decreasing the current rating of the bus bar assembly.
The number of stabs comprising the plurality of stabs for each bus bar member ma~ vary in accordance with the number of distribution circuits to be serviced.
Referring to Flg. 1, the functional operation of the distrlbution panelboard will now be described. Power is fed into the enclosure 10 by a conducting cable. Generally the conducting cable will comprise a neutral conductor, a ground conductor, and two live line conductors. The conducting cable ls passed into the topmost portlon of enclosure 10 through a sultable aperture 14. It may be as~umed that some suitable means, such as bushing connectors, are used at this aperture to provide mechanical support and physlcal protection for the insulation on the cable.
The ground conductor of the incoming cable is secured by a suitable screw 60 to provide an electrical and mechanical connection. The neutral conductor of the lncoming cable is placed into the opening of terminal connector 46 having screw 62 whlch secures the neutral wlre to bus bar 42. However, before advancing screw 62 lnto terminal connector 46, terminal connector 46 can be moved to a sultable posltion along bar 42.
The incoming clrcult breaker de~ice may be connected to the topmost stab of each bus bar sheet 70 and 71. It should be understood that the lncoming circuit breaker device may be located at a varlety of breaker locations on the bus bar panel assembly 18 as long as lt ls connected to one stab from each set of stabs 72 and 73. The clrcult breaker devlce, whlch may lnclude a multipllclty of breakers or a multlpole breaker, will monltor and control the flow of current to be carrled by the bus bar assembly. The incoming cable bearing the two "live"
conductors will be connected to the circult breaklng device, such that the upper most stab of stabs 72 wlll feed sheet 70 wlth one lncomlng "llve" llne and the upper most stab of stabs 73 wlll feed sheet 71 wlth the alternate incoming "live" llne.
In thls manner, all stabs 72 carry a voltage which in common to one Or the incomlng "ll~e" llnes and stabs 73 carry the ~oltage common to the alternate incomlng "live" llne.
The distrlbution clrcuit breakers 40 monitor and control the current flow to their respectlve loads. The clrcuit breaker 40 of the proper rating is mated with hook 38 at a sultable locatlon. The circult breaker 40 ls then rotated about hook 38 untll its stab connectlon engages the proper stab terminal (one stab of elther plurality of stabs 72 or 73). The outgolng cable ls passed through a suitable aperture 14 lnto the enclosure 10. The "ll~e" line of the 3 outgoing cable is connected to the distribution circuit breaker.
The neutral llne of the outgoing cable is connected to rails 30 by a sultable screw 36. The ground line of the outgoing 1~37721 cable is connected to a suitable screw 60 found in enclosure 10. Current being fed from the bus bar assembly to various loads is monitored and controlled by the breakers 40.
Referring now to Fig. 4, a sectional side view of a panelboard assembly is shown comprising three bus bar sheets 100, 102, and 104 stacked one above the other with insulating members 106, and 108 shown therebetween. The electrically non-conductive epoxy material is not shown. m e construction of this bus bar assembly is essentially similar to the assembly previously described. This bus bar assembly permits for the distribution of incoming three phase power.
It should be understood that screw type connectors can be used instead of stab connector. The screw type connectors may be easily formed by bending the upper portion of the stab connector at right angles to the lower portion Or the stab.
Tapping a hole in the upper portion of the screw type connector will provide an aperture for receiving a screw.
It should be understood that the preferred embodiment of this inventlon may be altered to comply with standard electrical regulatlons enforced in different regions where this bus bar assembly is to be implemented.
Canadian Patent Application S. M. 229.119 entitled "Loadcentre Having a Dual Purpose ~Jeutral Rail"~ filed June 11~
1975 by Coles et al is related to this application and assigned to the assi~nee of this invention BACKGROU~D
In the past, panelboards of lower power ratings such as would be found in domestic residences have generally had a configuration which is more or less standard in the electrical industry Electrical power is fed by means of insulated conducting cables through the walls of the panelboard to a main circuit breaker The main circuit breaker is usually connected to stabs found at the uppermost area of the bus bar assembly. The main circuit breaker transfers the incoming current to the stabs which in turn feeds the current via the "live" bus bar to stabs found at the lower portion of the bus bar assembly. Smaller capacity circuit breakers are 10~721 connected to these lower portlon stabs in order to control and monitor the flow of current to the distribution circuits.
The incoming neutral conductors are usually connected to a neutral rail located at either the top or bottom portion of the distribution panelboard.
In particular, previous bus bar assembly designs, such as described in Canadian Patent 989,o58 issued to K. R. Coley on May 11, 1976, comprlse two elongated flat bus bar members electrically isolated and mechanically supported by an insulating support member. Each bus bar member consists of a flat elongated main body from which extend a plurality of stabs. The insulating support member is a flat elongated sheet having stab receiving slots dlsplaced along both lengthwi~e edges. The bus bar asæembly iæ formed by fitting the stabæ
of each bus bar member into the stabs recelvlng slots of the insulating support member æo that the bus bar memberæ are poæitioned on oppoæite sides of the support member. Because the design requires an in8ulating support member sturdy enough to support the bus bar members, the insulating member iæ not very flexlble which may give rl~e to eaæy breakage. Moreover, the surface area required by the flat lnsulating support member and the two flat bus bar members of thiæ deslgn does not af~ord optimal accessibility to other components within the distrlbution panelboard.
_UMMARY OF THE INVENTION
This invention relateæ to a novel buæ bar assembly within a panelboard ætructure wherein circuit breakeræ are uæed to control and monitor incoming current into the panel-board, as well aæ the current flowing out of the diætribution panelboard to various loadæ. The incoming power iæ fed from the lncoming conductoræ to a main circuit breaker uæually lQ877Zl located at the top of the bus bar assembly. The power i8 transferred by way of the bus bar aæsembly to the distribution clrcult breakers. The dlstributlon circult breaker~ are generally mounted on the lower section of the bus bar assembly by securing one end of the breaker to a hook located on a neutral rail and connecting the other end o~ the breaker to the "live" bus by means of a screw or stab connection.
The incoming and outgoing neutral conductor cable~
are connected to the neutral rail. The panelboard i8 similar ln appearance to the aformentioned Canadian Patent Application S. N. 229,119, but the bus bar assembly Or this lnvention dirfers from the aforementloned Appllcation as described herebelow.
In particular, this lnvention relates to a distribution panelboard including a bus bar member. m e bus bar member includes a substantially flat elongated conductive sheet having a pluralitg of substantially e~enly spaced apertures contained therein arranged along the longitudinal axls of the sheet.
A plurality of ~lmilar shaped planer stabs extend substantially orthogonally from the sheet. Each of the stabs is allocated to one of the apertures so that each aperture has ad~acent thereto one stab and the plane o~ the stab is transverse to the longitudinal axls of the sheet. The stabs have a width less than the aperture wlath.
The bus bar member is mounted on the insulating support member in a suitable manner and provides for the distribution of the incoming power to the distribution circuit breakers.
It should be understood that the bus bar assembly 3 may consist of two or more elongated bus bar members arranged in ~he manner subsequently descrlbed. It is proposed that ~or a bus bar assembly to service two incoming 'llive" power 772~
lines, two bus bar members are positioned side by side with each stab of the second bus bar member passing through a corresponding aperture of the first bus bar member. The length of the protruding stabs of the firæt bus bar member may be shortened so that when the two bus bar members are place~ in this collateral arrangement the stabs of both members protrude a substantially equal dlstance from the face of the first bus bar member. Suitable dielectric materlal is provlded to effectlvely electrically isolate the two bus bar members. One method of providing the necessary electrical insulation is to position a flat elongated insulation member between the bus bar members such that the stabs of the lower bus bar pass through apertures in the insulation member and the aligned apertures in the upper bus bar. This insulation member is constructed from an electrically non-conductive materlal such as NOMEX (a trademark). Another method of insulation may con~ist o~ an electrically non-conductive material such as Scotchgard 260 (a trademark) coated on the ~heets of each bus bar member by a fluidized bed epoxy process. Insulatlon may be provided by uslng both the coated material and the insulation member. It should be understood that lnsulation may be applied to the bus bars by a variety of other methods.
Distribution circuit bre~kers are connected to the stab connectors o~ the bus bar assembly in a manner similar to that of the main breakers This bus bar assembly is relatively easy to manufacture and re~uires substantially lesæ surface area within the distri-bution panelboard than prior art designs. In this panelboard design the insulation provided between bus bar members does not have to provide any mechanical support for the bus bar members as in prior art designs Installation and maintenance 7~Zl operations performed on distribution panelboards of this construction are made easier due to the compactness of this bus bar assembly.
BRIEF DESCRIPTION OF THE DRAWINGS
Flgure 1 shows one embodiment of the bus bar assembly for a single phase three wire distribution panelboard.
Flgure 2 ls a more detailed vlew of the bus bar assembly shown in Fig. 1.
Flgure 3 ls an exploded view of the upper insulating support member of Flgure 1.
Figure 4 ls a sectlonal slde vlew showlng a bus bar assembly capable of servicing a 3 phase system.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Re~errlng now to Fig. 1, one embodiment of the inventlon ls shown for two bus bar members. Other embodlments of the inventlon may lnclude more than two bus bar members dependlng on the number of phases the distrlbution panelboard assembly ls requlred to service. A metalllc box-llke enclosure 10 ~s provlded ln Flg. 1 wlth three mountlng locatlons shown at 12. The three mountlng locations 12 permlt the enclosure 10 to be mounted to a suitable mountlng surface. Knock out punches 14 are provided on the top, bottom and both slde surfaces of the enclosure to provide access openlngs for the passage of conductors therethrough.
Mounted within enclosure 10 ls a clrcult breaker and panel assembly 16. Bus bar assembly 18 wlll be mounted on insulatlng support member 20 by means of rlvets 22. Support member 20 will be mounted to the enclosure 10 by studs 24 and nuts 26. A sheet of insulating material 28 lles between encloæure 10 and support member 20. Two slde ralls 30 are connected to support member 20 in a su~table manner such as rivets 32. Slde rails 30 may be constructed from a suitable electrically conductive material, such as extruded aluminium.
lOB7721 Side rails 30 are provided with holes 34 and ~crews 36 to which neutral electrically conducting wire may be connected.
Hooks 38 on side rails 30 secure circuit breakers 40 as shown The mechanical structure of rails 30 is described further in the aforementloned Canadian Application.
Electrlcal conducting bar 42 connects rails 30 together at the top of panel assembly 16 by means of screws 44, as shown in Fig. 1. Terminal connectors 46 and 48, shown on bar 42, provide an electrlcal connection for the incoming neutral conducting wire. Connectors 46 and 48 may slide along bar 42 to any desired position.
Referring now to Fig. 1 and Fig. 2, the essentlal features for thls embodiment of the invention are shown at 18. The bus bar assembly comprises two rectangular bus bar ~heets 70 and 71 from which respectlvely protrude a plurality of stabs 72 and 73. The sheets 70 and 71 are constructed from a suitable electrically conductive material, such as aluminum. Stab~ 73 are formed by punching out a plurality o~ holes which leave a plurality of U-shaped penlnsulae in ~heet 71. The peninsulae formed when the holes are punched out are then bent to form stabs 73 which extend orthogonally from sheet 71~ The formation of stabs 73 results in substantially rectangular apertures 77 being produced. Stabs 72 are formed from sheet 70 in a manner similar to the formation of stabs 73 so that apertures 76 are produced.
An electrically insulating epoxy material, such as Scotchgard 260 (a trademark) is coated on the flat conductive sheets by a fluidized bed process. An alternate means of insulation between the two bus bar sheets is to posltion an 3 insulating member 80 between sheets 70 and 71. Insulating member 80 may be constructed from an electrically non-conductive ln~77zl material such as NOMEX (a trademark~. The insulatlng member 80 is preferably a flat rectangular sheet wherein a plurality of spaced rectangular openings are provided. The openings will be of sufficient size to permit stabs 72 of the lower bus bar member 70 to pass therethrough.
The bus bar assembly 18 is constructed by placing sheet 71 on top of sheet 70 with insulating member 80 there-between. Stabs 72 of sheet 70 extend through the openings of insulating member 80 and the apertures 77 of sheet 71.
The bus bar sheet 71 i8 positioned on top of insulating member 80 which in turn is positioned on top of the sheet 70 forming bus bar assembly 18. Assembly 18 is mounted to ~upport 20 by rivets 22 as shown in Figures 1 and 2. Rivets 22 extend through a hole in sheet 71 and aperture 76 in sheet 70 into support 20. Due to the size of aperture 76, there is no electrical contact between sheets 70 and 71.
It may be desirable to have the stabs 72 and 73 extending a substantially equal dlstance from the surface Or bus bar sheet 71. This being the case, stabs 73 Or upper bu~ bar sheet 71 may be shortened accordingly.
Figure 3 shows a detailed view of the upper insulating support member 20 of Flg. 1. Spacers 50 and 52 are provlded to locate the upper and lower bus bar sheets, respectively, as well as insulating member 80. Spacer 50 locates upper bus bar sheet 71 by passing through one aperture of each of the plurality of apertures 76, 77, and one of the apertures of the insulating member 80. Spacers 52 locate the lower bus bar sheet 70 by passing through one aperture Or apertures 76 of lower bus bar sheet 70. The lower bus bar sheet rests on supports 54 above ~ace 56.
A bus bar assembly required to service a three phase system can readily be accommodated by insulating support m~77zl member 20. T~e flrst and second bus bar sheets sre located ln the same manner as set out above. A third bus bar sheet ma~ be located beneath the seccnd sheet by fitting supports 54 lnto pre-cut circular grooves in the third sheet such that the third sheet lies between supports 54. The pre-cut circular grooves can be cut in such a manner so as to locate the third sheet relative to the flrst and second sheets so that stabs of the third sheet extend through the apertures in the first and second sheets as well as the apertures in insulating members.
Insulation between the third sheet and the second sheet requires an insulation member similar to insulating member 80 between the first and second sheets which is located by supports 54 in a manner similar to the third sheet.
It should be further understood that the width of the bus bar sheets may be increased or decreased thereb~
respectively increasing or decreasing the current rating of the bus bar assembly.
The number of stabs comprising the plurality of stabs for each bus bar member ma~ vary in accordance with the number of distribution circuits to be serviced.
Referring to Flg. 1, the functional operation of the distrlbution panelboard will now be described. Power is fed into the enclosure 10 by a conducting cable. Generally the conducting cable will comprise a neutral conductor, a ground conductor, and two live line conductors. The conducting cable ls passed into the topmost portlon of enclosure 10 through a sultable aperture 14. It may be as~umed that some suitable means, such as bushing connectors, are used at this aperture to provide mechanical support and physlcal protection for the insulation on the cable.
The ground conductor of the incoming cable is secured by a suitable screw 60 to provide an electrical and mechanical connection. The neutral conductor of the lncoming cable is placed into the opening of terminal connector 46 having screw 62 whlch secures the neutral wlre to bus bar 42. However, before advancing screw 62 lnto terminal connector 46, terminal connector 46 can be moved to a sultable posltion along bar 42.
The incoming clrcult breaker de~ice may be connected to the topmost stab of each bus bar sheet 70 and 71. It should be understood that the lncoming circuit breaker device may be located at a varlety of breaker locations on the bus bar panel assembly 18 as long as lt ls connected to one stab from each set of stabs 72 and 73. The clrcult breaker devlce, whlch may lnclude a multipllclty of breakers or a multlpole breaker, will monltor and control the flow of current to be carrled by the bus bar assembly. The incoming cable bearing the two "live"
conductors will be connected to the circult breaklng device, such that the upper most stab of stabs 72 wlll feed sheet 70 wlth one lncomlng "llve" llne and the upper most stab of stabs 73 wlll feed sheet 71 wlth the alternate incoming "live" llne.
In thls manner, all stabs 72 carry a voltage which in common to one Or the incomlng "ll~e" llnes and stabs 73 carry the ~oltage common to the alternate incomlng "live" llne.
The distrlbution clrcuit breakers 40 monitor and control the current flow to their respectlve loads. The clrcuit breaker 40 of the proper rating is mated with hook 38 at a sultable locatlon. The circult breaker 40 ls then rotated about hook 38 untll its stab connectlon engages the proper stab terminal (one stab of elther plurality of stabs 72 or 73). The outgolng cable ls passed through a suitable aperture 14 lnto the enclosure 10. The "ll~e" line of the 3 outgoing cable is connected to the distribution circuit breaker.
The neutral llne of the outgoing cable is connected to rails 30 by a sultable screw 36. The ground line of the outgoing 1~37721 cable is connected to a suitable screw 60 found in enclosure 10. Current being fed from the bus bar assembly to various loads is monitored and controlled by the breakers 40.
Referring now to Fig. 4, a sectional side view of a panelboard assembly is shown comprising three bus bar sheets 100, 102, and 104 stacked one above the other with insulating members 106, and 108 shown therebetween. The electrically non-conductive epoxy material is not shown. m e construction of this bus bar assembly is essentially similar to the assembly previously described. This bus bar assembly permits for the distribution of incoming three phase power.
It should be understood that screw type connectors can be used instead of stab connector. The screw type connectors may be easily formed by bending the upper portion of the stab connector at right angles to the lower portion Or the stab.
Tapping a hole in the upper portion of the screw type connector will provide an aperture for receiving a screw.
It should be understood that the preferred embodiment of this inventlon may be altered to comply with standard electrical regulatlons enforced in different regions where this bus bar assembly is to be implemented.
Claims (4)
1. In a distribution panelboard a bus bar assembly comprising:
a first bus bar distribution member;
a second bus bar distribution member;
said first member and said second member each comprising a substantially flat elongated conductive sheet having a plurality of substantially evenly spaced apertures therein, said apertures arranged along the longitudinal axis of said conductive sheet, a plurality of similar shaped planer stabs extending substantially orthogonally from said conductive sheet, each of said apertures having adjacent thereto one of said stabs, the plane of said stab being transverse to the longitudinal axis of said conductive sheet, said stab having a width less than the width of said aperture;
insulating means electrically insulating said con-ductive sheet of the first member from said conductive sheet of the second member;
said first member collateral with said second member with the stabs of said second member extending through the apertures of said first member, and support means supporting said first member relative to said second member.
a first bus bar distribution member;
a second bus bar distribution member;
said first member and said second member each comprising a substantially flat elongated conductive sheet having a plurality of substantially evenly spaced apertures therein, said apertures arranged along the longitudinal axis of said conductive sheet, a plurality of similar shaped planer stabs extending substantially orthogonally from said conductive sheet, each of said apertures having adjacent thereto one of said stabs, the plane of said stab being transverse to the longitudinal axis of said conductive sheet, said stab having a width less than the width of said aperture;
insulating means electrically insulating said con-ductive sheet of the first member from said conductive sheet of the second member;
said first member collateral with said second member with the stabs of said second member extending through the apertures of said first member, and support means supporting said first member relative to said second member.
2. In the distribution panelboard of claim 1 said insulating means comprising a flat electrically non-conductive sheet positioned between said first and said second member and having a plurality of openings therein through which said stabs of said second member extend.
3. In the distribution panelboard of claim 1 said insulating means comprising an electrically non-conductive coating on said conductive sheet of the first member and said conductive sheet of the second member.
4. The distribution panelboard of claim 1, 2, or 3 having an enclosure and means affixing said support means to the enclosure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA278,524A CA1087721A (en) | 1977-05-16 | 1977-05-16 | Bus bar assembly for distribution loadcentres |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA278,524A CA1087721A (en) | 1977-05-16 | 1977-05-16 | Bus bar assembly for distribution loadcentres |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1087721A true CA1087721A (en) | 1980-10-14 |
Family
ID=4108675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA278,524A Expired CA1087721A (en) | 1977-05-16 | 1977-05-16 | Bus bar assembly for distribution loadcentres |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1087721A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10250018B2 (en) | 2016-08-31 | 2019-04-02 | Abb Schweiz Ag | Electrical distribution apparatus and methods of assembling same |
| US10320174B2 (en) | 2016-08-31 | 2019-06-11 | Abb Schweiz Ag | Electrical distribution apparatus and methods of assembling same |
-
1977
- 1977-05-16 CA CA278,524A patent/CA1087721A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10250018B2 (en) | 2016-08-31 | 2019-04-02 | Abb Schweiz Ag | Electrical distribution apparatus and methods of assembling same |
| US10320174B2 (en) | 2016-08-31 | 2019-06-11 | Abb Schweiz Ag | Electrical distribution apparatus and methods of assembling same |
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| Date | Code | Title | Description |
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| MKEX | Expiry |