CA2456687C - Tension-resistant connection between a shielded heating cable and a power supply cable - Google Patents
Tension-resistant connection between a shielded heating cable and a power supply cable Download PDFInfo
- Publication number
- CA2456687C CA2456687C CA002456687A CA2456687A CA2456687C CA 2456687 C CA2456687 C CA 2456687C CA 002456687 A CA002456687 A CA 002456687A CA 2456687 A CA2456687 A CA 2456687A CA 2456687 C CA2456687 C CA 2456687C
- Authority
- CA
- Canada
- Prior art keywords
- cable
- ground conductor
- metal sheath
- free end
- power supply
- 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 - Lifetime
Links
- 238000010438 heat treatment Methods 0.000 title claims description 72
- 239000004020 conductor Substances 0.000 claims abstract description 133
- 239000002184 metal Substances 0.000 claims abstract description 73
- 229910052751 metal Inorganic materials 0.000 claims abstract description 73
- 238000009413 insulation Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 13
- 238000003466 welding Methods 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 19
- 229910052802 copper Inorganic materials 0.000 description 19
- 239000010949 copper Substances 0.000 description 19
- -1 polyethylene Polymers 0.000 description 14
- 239000004698 Polyethylene Substances 0.000 description 7
- 239000004743 Polypropylene Substances 0.000 description 7
- 239000003000 extruded plastic Substances 0.000 description 7
- 229920000573 polyethylene Polymers 0.000 description 7
- 229920001155 polypropylene Polymers 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 229910001092 metal group alloy Inorganic materials 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 239000013536 elastomeric material Substances 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005493 welding type Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/58—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/10—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation
- H01R4/12—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by twisting
Abstract
An electrical and mechanical connection between (a) a first shielded cable including a metal sheath and electrical conductors and (b) a second cable including a ground conductor and electrical conductors, comprises a zone of interconnection between the first and second cables. In this interconnection zone, a first connection is made between the free end of the metal sheath and the free end of the ground conductor, and second connections are made between the free ends of the electrical conductors of the first cable and the free ends of the electrical conductors of the second cable, respectively. Still in the interconnection zone, the interconnected metal sheath and ground conductor have a first length shorter than second lengths of the interconnected electrical conductors of the first cable and electrical conductors of the second cable whereby, in operation, longitudinal tension in the interconnection zone is totally supported by the interconnected metal sheath and ground conductor.
Description
TENSION-RESISTANT CONNECTION BETWEEN A SHIELDED
HEATING CABLE AND A POWER SUPPLY CABLE
FIELD OF THE INVENTION
The present invention relates to a tension-resistant electrical and mechanical connection between multi-conductor cables.
BACKGROUND OF THE INVENTION
United States patent No. 2,452,823 granted to Wright on November 2"d, 1948 describes a splice between free ends of two shielded cables. More specifically, the two cables each comprise multiple current-carrying conductors enclosed within a wire braid.
The cable splice of Wright requires stripping of the insulation from the free ends of the conductors. Each pair of conductors from the two cables are connected by means of a splicing tube and then individually insulated. A
braided wire sleeve. is then drawn over the spliced portion of the conductors.
The sleeve is then extended longitudinally to cause it to engage the splice, and is then lashed firmly in place with a lashing wire. Finally, the sleeve is securely lashed to portions of the wire braids and connects them mechanically.
The cable splice of United States patent No. 2,452,823 is not only complex but does not allow the wire braids of the two cables to efficiently and totally support a longitudinal tension applied to the cable splice.
HEATING CABLE AND A POWER SUPPLY CABLE
FIELD OF THE INVENTION
The present invention relates to a tension-resistant electrical and mechanical connection between multi-conductor cables.
BACKGROUND OF THE INVENTION
United States patent No. 2,452,823 granted to Wright on November 2"d, 1948 describes a splice between free ends of two shielded cables. More specifically, the two cables each comprise multiple current-carrying conductors enclosed within a wire braid.
The cable splice of Wright requires stripping of the insulation from the free ends of the conductors. Each pair of conductors from the two cables are connected by means of a splicing tube and then individually insulated. A
braided wire sleeve. is then drawn over the spliced portion of the conductors.
The sleeve is then extended longitudinally to cause it to engage the splice, and is then lashed firmly in place with a lashing wire. Finally, the sleeve is securely lashed to portions of the wire braids and connects them mechanically.
The cable splice of United States patent No. 2,452,823 is not only complex but does not allow the wire braids of the two cables to efficiently and totally support a longitudinal tension applied to the cable splice.
SUMMARY OF THE INVENTION
The present invention relates to a method of electrically and mechanically connecting (a) a first shielded cable comprising a metal sheath and electrical conductors with (b) a second cable comprising a ground conductor and electrical conductors. The method comprises:
connecting, in a zone of interconnection between the first and second cables, a free end of the metal sheath with a free end of the ground conductor;
connecting, in the interconnection zone, free ends of the electrical conductors of the first cable with free ends of the electrical conductors of the second cable, respectively; and making, in the interconnection zone, a length of the interconnected metal sheath and ground conductor shorter than lengths of the interconnected electrical conductors of the first cable and electrical conductors of the second cable whereby, in operation, longitudinal tension in the interconnection zone is totally supported by the interconnected metal sheath and ground conductor.
The present invention also relates to an electrical and mechanical connection between (a) a first shielded cable comprising a metal sheath and electrical conductors and (b) a second cable comprising a ground conductor and electrical conductors. The electrical and mechanical connection comprises:
a zone of interconnection between the first and second cables;
in the interconnection zone, a first connection between a free end of the metal sheath and a free end of the ground conductor; and in the interconnection zone, second connections between free ends of the electrical conductors of the first cable and free ends of the electrical conductors of the second cable, respectively;
In the interconnection zone, the interconnected metal sheath and ground conductor have a first length shorter than second lengths of the interconnected electrical conductors of the first cable and electrical conductors of the second cable whereby, in operation, longitudinal tension in the interconnection zone is totaNy supported by the interconnected metal sheath and ground conductor.
The present invention further relates to a method of electrically and mechanically connecting (a) a shielded heating cable comprising a metal sheath and heating wire elements with (b) a power supply cable comprising a ground conductor and power supply conductors. The method comprises:
connecting, in a zone of interconnection between the shielded heating cable and the power supply cable, a free end of the metal sheath with a free end of the ground conductor;
connecting, in the interconnection zone, free ends of the heating wire elements with free ends of the power supply conductors, respectively; and making, in the interconnection zone, a length of the interconnected metal sheath and ground conductor shorter than lengths of the interconnected heating wire elements and power supply conductors whereby, in operation, longitudinal tension in the interconnection zone is totally supported by the interconnected metal sheath and ground conductor.
The present invention still further relates to an electrical and mechanical connection between (a) a shielded heating cable comprising a metal sheath and heating wire elements and (b) a power supply cable comprising a ground conductor and power supply conductors. The electrical and mechanical connection comprises:
a zone of interconnection between the shielded heating cable and the power supply cable;
in the interconnection zone, a first connection between a free end of the metal sheath and a free end of the ground conductor; and in the interconnection zone, second connections between free ends of the heating wire elements and free ends of the power supply conductors, respectively.
In the interconnection zone, the interconnected metal sheath and ground conductor have a first length shorter than second lengths of the interconnected heating wire elements and power supply conductors whereby, in operation, longitudinal tension in the interconnection zone is totally supported by the interconnected metal sheath and ground conductor.
The foregoing and other objects, advantages and features of the present invention will become more apparent upon reading of the following non-restrictive description of illustrative embodiments thereof, given by way of example only with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the appended drawings:
Figure 1 is a side elevational view of a non-restrictive illustrative embodiment of the present invention, showing an interconnection zone between a shielded heating cable and a power supply cable.
DETAILED DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENT
The non-restrictive illustrative embodiment of the method and connection according to the present invention, for electrically and mechanically connecting a shielded heating cable with a power supply cable will now be described with reference to Figure 1.
Although the present invention will be described in relation to connection of a shielded heating cable with a power supply cable, it should be kept in mind that it is within the scope of the present invention to apply the same concept to other types of multi-conductor cables.
Shielded heating cable 1 Referring to Figure 1, the shielded heating cable, generally identified by the reference 1 comprises:
The present invention relates to a method of electrically and mechanically connecting (a) a first shielded cable comprising a metal sheath and electrical conductors with (b) a second cable comprising a ground conductor and electrical conductors. The method comprises:
connecting, in a zone of interconnection between the first and second cables, a free end of the metal sheath with a free end of the ground conductor;
connecting, in the interconnection zone, free ends of the electrical conductors of the first cable with free ends of the electrical conductors of the second cable, respectively; and making, in the interconnection zone, a length of the interconnected metal sheath and ground conductor shorter than lengths of the interconnected electrical conductors of the first cable and electrical conductors of the second cable whereby, in operation, longitudinal tension in the interconnection zone is totally supported by the interconnected metal sheath and ground conductor.
The present invention also relates to an electrical and mechanical connection between (a) a first shielded cable comprising a metal sheath and electrical conductors and (b) a second cable comprising a ground conductor and electrical conductors. The electrical and mechanical connection comprises:
a zone of interconnection between the first and second cables;
in the interconnection zone, a first connection between a free end of the metal sheath and a free end of the ground conductor; and in the interconnection zone, second connections between free ends of the electrical conductors of the first cable and free ends of the electrical conductors of the second cable, respectively;
In the interconnection zone, the interconnected metal sheath and ground conductor have a first length shorter than second lengths of the interconnected electrical conductors of the first cable and electrical conductors of the second cable whereby, in operation, longitudinal tension in the interconnection zone is totaNy supported by the interconnected metal sheath and ground conductor.
The present invention further relates to a method of electrically and mechanically connecting (a) a shielded heating cable comprising a metal sheath and heating wire elements with (b) a power supply cable comprising a ground conductor and power supply conductors. The method comprises:
connecting, in a zone of interconnection between the shielded heating cable and the power supply cable, a free end of the metal sheath with a free end of the ground conductor;
connecting, in the interconnection zone, free ends of the heating wire elements with free ends of the power supply conductors, respectively; and making, in the interconnection zone, a length of the interconnected metal sheath and ground conductor shorter than lengths of the interconnected heating wire elements and power supply conductors whereby, in operation, longitudinal tension in the interconnection zone is totally supported by the interconnected metal sheath and ground conductor.
The present invention still further relates to an electrical and mechanical connection between (a) a shielded heating cable comprising a metal sheath and heating wire elements and (b) a power supply cable comprising a ground conductor and power supply conductors. The electrical and mechanical connection comprises:
a zone of interconnection between the shielded heating cable and the power supply cable;
in the interconnection zone, a first connection between a free end of the metal sheath and a free end of the ground conductor; and in the interconnection zone, second connections between free ends of the heating wire elements and free ends of the power supply conductors, respectively.
In the interconnection zone, the interconnected metal sheath and ground conductor have a first length shorter than second lengths of the interconnected heating wire elements and power supply conductors whereby, in operation, longitudinal tension in the interconnection zone is totally supported by the interconnected metal sheath and ground conductor.
The foregoing and other objects, advantages and features of the present invention will become more apparent upon reading of the following non-restrictive description of illustrative embodiments thereof, given by way of example only with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the appended drawings:
Figure 1 is a side elevational view of a non-restrictive illustrative embodiment of the present invention, showing an interconnection zone between a shielded heating cable and a power supply cable.
DETAILED DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENT
The non-restrictive illustrative embodiment of the method and connection according to the present invention, for electrically and mechanically connecting a shielded heating cable with a power supply cable will now be described with reference to Figure 1.
Although the present invention will be described in relation to connection of a shielded heating cable with a power supply cable, it should be kept in mind that it is within the scope of the present invention to apply the same concept to other types of multi-conductor cables.
Shielded heating cable 1 Referring to Figure 1, the shielded heating cable, generally identified by the reference 1 comprises:
5 - a pair of spirally twisted heating wire elements 11 and 12;
- a metal sheath 13 enclosing the pair of spirally twisted heating wire elements 11 and 12; and - an insulating jacket 14 covering the metal sheath 13.
Heating wire element 71 The heating wire element 11 comprises a resistance wire 111 covered with insulation 112.
The resistance wire 111 has an electrical resistance (resistance by unit of length of resistance wire) dependent on the diameter of the wire 111. More specifically, the electrical resistance of the resistance wire 111 is adjusted, taking into consideration the total length of the heating wire element 11 in a typical installation, to release a given amount of heat when supplied with alternating current from, for example, a 120-Volt 60-Hz voltage source commonly found in residential, industrial and commercial buildings.
The resistance wire 111 can be made of copper, or another electrically conductive material, for example an electrically conductive metal other than copper, or an electrically conductive metal alloy including copper and/or any other suitable metal(s).
The insulation 112 of the heating wire element 11 can be made of extruded plastic material such as polyethylene or polypropylene capable of withstanding and conducting the heat generated by and released from the resistance wire 111.
- a metal sheath 13 enclosing the pair of spirally twisted heating wire elements 11 and 12; and - an insulating jacket 14 covering the metal sheath 13.
Heating wire element 71 The heating wire element 11 comprises a resistance wire 111 covered with insulation 112.
The resistance wire 111 has an electrical resistance (resistance by unit of length of resistance wire) dependent on the diameter of the wire 111. More specifically, the electrical resistance of the resistance wire 111 is adjusted, taking into consideration the total length of the heating wire element 11 in a typical installation, to release a given amount of heat when supplied with alternating current from, for example, a 120-Volt 60-Hz voltage source commonly found in residential, industrial and commercial buildings.
The resistance wire 111 can be made of copper, or another electrically conductive material, for example an electrically conductive metal other than copper, or an electrically conductive metal alloy including copper and/or any other suitable metal(s).
The insulation 112 of the heating wire element 11 can be made of extruded plastic material such as polyethylene or polypropylene capable of withstanding and conducting the heat generated by and released from the resistance wire 111.
Heating wire element 12 In the same manner, the heating wire element 12 comprises a resistance wire 121 covered with insulation 122.
The resistance wire 121 has an electrical resistance (resistance by unit of length of resistance wire) dependent on the diameter of the wire 121. More specifically, the electrical resistance of the resistance wire 121 is adjusted, taking into consideration the total length of the heating wire element 12 in a typical installation, to release a given amount of heat when supplied with alternating current from, for example, a 120-Volt 60-Hz voltage source commonly found in residential, industrial and commercial buildings.
The resistance wire 121 can be made of copper, or another electrically conductive material, far example an electrically conductive metal other than copper, or an electrically conductive metal alloy including copper and/or any other suitable metal(s).
The insulation 122 of the heating wire element 12 can be made of extruded plastic material such as polyethylene or polypropylene capable of withstanding and conducting the heat generated by and released from the resistance wire 121.
The heating wire elements 11 and 12 are spirally twisted with a given lay, this lay corresponding to the length required by the heating wire elements 11 and 12 to be spirally twisted by 1 turn. An advantage is that, by spirally twisting the heating wire elements 11 and 12, the electromagnetic field from the heating wire element 11 and the electromagnetic field from the heating wire element 12 substantially cancel each other, of course when the current has the same given amplitude in the two heating wire elements 11 and 12, and the current flowing through the heating wire element 11 flows in a direction opposite to the current flowing through the heating wire element 12.
The resistance wire 121 has an electrical resistance (resistance by unit of length of resistance wire) dependent on the diameter of the wire 121. More specifically, the electrical resistance of the resistance wire 121 is adjusted, taking into consideration the total length of the heating wire element 12 in a typical installation, to release a given amount of heat when supplied with alternating current from, for example, a 120-Volt 60-Hz voltage source commonly found in residential, industrial and commercial buildings.
The resistance wire 121 can be made of copper, or another electrically conductive material, far example an electrically conductive metal other than copper, or an electrically conductive metal alloy including copper and/or any other suitable metal(s).
The insulation 122 of the heating wire element 12 can be made of extruded plastic material such as polyethylene or polypropylene capable of withstanding and conducting the heat generated by and released from the resistance wire 121.
The heating wire elements 11 and 12 are spirally twisted with a given lay, this lay corresponding to the length required by the heating wire elements 11 and 12 to be spirally twisted by 1 turn. An advantage is that, by spirally twisting the heating wire elements 11 and 12, the electromagnetic field from the heating wire element 11 and the electromagnetic field from the heating wire element 12 substantially cancel each other, of course when the current has the same given amplitude in the two heating wire elements 11 and 12, and the current flowing through the heating wire element 11 flows in a direction opposite to the current flowing through the heating wire element 12.
Metal sheath 13 The metal sheath 13 is formed of a plurality of small-diameter copper wires braided together to form a tubular shielding andlor a metal tape spirally wound or longitudinally applied. The main function of the metal sheath 13 is to ground the heating cable 1 through a connection to the ground. The metal sheath i 3 is also designed to resist to impacts as strong as 100 Ibs.
Of course, the metal sheath 13 will comprise braided wires andlor tape made of an electrically conductive material capable of withstanding and conducting the heat generated by and released from the resistance wires 111 and 121. Although this material could be copper, it is within the scope of the present invention to use another electrically conductive material, for example an electrically conductive metal other than copper, or an electrically conductive metal alloy including copper and/or any other suitable metal(s).
Insulating jacket 14 The insulating jacket 14 covering the metal sheath 13 can be made of extruded plastic or elastomeric material with or without subsequent cross-linking such as polyethylene or polypropylene capable of withstanding and conducting the heat generated by and released from the resistance wires 111 and 121.
Power supply cable 2 Still referring to Figure 1, the power supply cable, generally identified by the reference 2, comprises:
- an insulated ground conductor 22;
- two insulated electrical conductors 21 and 23; and - an insulating jacket 24 enclosing the three insulated conductors 21, 22 and 23.
Insulated electrical conductor 21 The insulated electrical conductor 21 comprises an electrically conductive wire 211 covered with insulation 212. The electrically conductive wire 211 can be made of copper, or of another electrically conductive material, for example an electrically conductive metal other than copper, or an electrically conductive metal alloy including copper and/or any other suitable metal(s). The insulation 212 of the insulated electrical conductor 21 can be made of extruded plastic material such as polyethylene or polypropylene.
Insulated ground conductor 22 The insulated ground conductor 22 comprises an electrically conductive wire 221 covered with insulation 222. The electrically conductive wire 221 can be made of copper, or of another electrically conductive material, for example an electrically conductive metal other than copper, or an electrically conductive metal alloy including copper and/or any other suitable metal(s). The insulation 222 of the insulated ground conductor 22 can be made of extruded plastic material such as polyethylene or polypropylene.
Insulated electrical conductor 23 The insulated electrical conductor 23 comprises an electrically conductive wire 231 covered with insulation 232. This electrically conductive wire 231 can be made of copper, or of another electrically conductive material, for example an electrically conductive metal other than copper, or an electrically conductive metal alloy including copper andlor any other suitable metal(s). The insulation 232 of the insulated electrical conductor 23 can be made of extruded plastic material such as polyethylene or polypropylene.
Of course, the metal sheath 13 will comprise braided wires andlor tape made of an electrically conductive material capable of withstanding and conducting the heat generated by and released from the resistance wires 111 and 121. Although this material could be copper, it is within the scope of the present invention to use another electrically conductive material, for example an electrically conductive metal other than copper, or an electrically conductive metal alloy including copper and/or any other suitable metal(s).
Insulating jacket 14 The insulating jacket 14 covering the metal sheath 13 can be made of extruded plastic or elastomeric material with or without subsequent cross-linking such as polyethylene or polypropylene capable of withstanding and conducting the heat generated by and released from the resistance wires 111 and 121.
Power supply cable 2 Still referring to Figure 1, the power supply cable, generally identified by the reference 2, comprises:
- an insulated ground conductor 22;
- two insulated electrical conductors 21 and 23; and - an insulating jacket 24 enclosing the three insulated conductors 21, 22 and 23.
Insulated electrical conductor 21 The insulated electrical conductor 21 comprises an electrically conductive wire 211 covered with insulation 212. The electrically conductive wire 211 can be made of copper, or of another electrically conductive material, for example an electrically conductive metal other than copper, or an electrically conductive metal alloy including copper and/or any other suitable metal(s). The insulation 212 of the insulated electrical conductor 21 can be made of extruded plastic material such as polyethylene or polypropylene.
Insulated ground conductor 22 The insulated ground conductor 22 comprises an electrically conductive wire 221 covered with insulation 222. The electrically conductive wire 221 can be made of copper, or of another electrically conductive material, for example an electrically conductive metal other than copper, or an electrically conductive metal alloy including copper and/or any other suitable metal(s). The insulation 222 of the insulated ground conductor 22 can be made of extruded plastic material such as polyethylene or polypropylene.
Insulated electrical conductor 23 The insulated electrical conductor 23 comprises an electrically conductive wire 231 covered with insulation 232. This electrically conductive wire 231 can be made of copper, or of another electrically conductive material, for example an electrically conductive metal other than copper, or an electrically conductive metal alloy including copper andlor any other suitable metal(s). The insulation 232 of the insulated electrical conductor 23 can be made of extruded plastic material such as polyethylene or polypropylene.
Insulating jacket 24 The insulating jacket 24 enclosing the three insulated conductors 21-23 can be made of extruded plastic or elastomeric material with or without subsequent cross-linking such as polyethylene or polypropylene.
Electrical and mechanical connection To electrically and mechanically connect a free end 15 of the shielded heating cable 1 to a free end 25 of the power supply cable 2, the following operations are conducted:
- the insulating jacket 14 is stripped from the free end 15 of the shielded heating cable 1 to expose a free end of the metal sheath 13;
- the heating wire elements 11 and 12 are withdrawn from the exposed free end of the metal sheath 13;
- the insulation 112 is stripped from the free end of the heating wire element 11 to expose a free end 113 of the resistance wire 111;
- the insulation 122 is stripped from the free end of the heating wire element 12 to expose a free end 123 of the resistance wire 121;
- the insulation 212 is stripped from the free end of the power supply conductor 21 to exposed a free end 213 of the electrically conductive wire 211;
- the insulation 222 is stripped from the free end of the ground conductor 22 to exposed a free end 223 of the electrically conductive wire 221;
- the insulation 232 is stripped from the free end of the power supply conductor 23 to expose a free end 233 of the electrically conductive wire 231;
- the free end 223 of the electrically conductive wire 221 of the ground 5 conductor 22 is ultrasonically welded to the free end of the metal sheath 13 corresponding to the stripped free end 15 of the shielded heating cable;
- the free ends 113 and 213 are ultrasonically welded; and 10 - the free ends 123 and 233 are ultrasonically welded.
As illustrated in Figure 1, in a zone 3 of interconnection between the shielded heating cable 1 and the power supply cable 2, the interconnected metal sheath 13 and ground conductor 22 have a length shorter than a length of the interconnected heating wire element 11 and power supply conductor 21.
Also, the interconnected metal sheath 13 and ground conductor 22 have, in the zone 3, a length shorter than a length of the interconnected heating wire element 12 and power supply conductor 23. In this manner, in operation, longitudinal tension in the interconnection zone 3 is totally supported by the interconnected metal sheath 13 and ground conductor 22.
Since the heating wire elements 11 and 12 have small-diameter, fragile resistance wires 111 and 121, the construction illustrated in Figure 1 will protect the resistance wires 111 and 121 from rupture or other damage caused by tension in the interconnection zone 3 of the cables 1 and 2.
The loop made with each of the resistance wires 111 and 121 at the point of connection between the shielded heating cable 1 and the power supply cable 2 also provides room to relieve the stress caused by the thermal expansion of the resistance wires 111 and 112 when electrical power is applied. The resistance wires 111 and 121 having a diameter much smaller than the electrically conductive wires 211 and 231 of the power supply cable 2 (non-heating cable), without these loops, all of the expansion stress would be localized at the weakest points of the resistance wires 111 and 121, which would be the points just next to the respective connections with the electrically conductive wires 211 and 231 of the power supply cable 2. Without the loops, there would be a higher probability of having power interruptions due to the breakage of the resistance wires 111 and 121 at these particular points.
Although the non-restrictive illustrative embodiment of the present invention has been described in relation to ultrasonic welding of the wires and sheath, it should be kept in mind that it is within the scope of the present invention to use other types of welding as well as other types of connections.
Also, the interconnected heating wire element 11 and power supply conductor 21 can form a 360°- loop (not shown} in the interconnection zone 3.
The free wire ends 113 and 213 can then be placed side by side in the continuity of both the heating wire element 11 and power supply conductor 21 and ultrasonically welded in this position.
In the same manner, the interconnected heating wire element 12 and power supply conductor 23 can form a 360° loop (not shown) in the interconnection zone 3. The free wire ends 123 and 233 can then be placed side by side in the continuity of both the heating wire element 12 and power supply conductor 23 and ultrasonically welded in this position.
Finally, the interconnected wire free end 223 and metal sheath free end, the interconnected free ends 113 and 213, and the interconnected free ends 123 and 233 are individually insulated using conventional techniques well known to those of ordinary skill in the art. In the same manner the individually insulated interconnected wire free end 223 and metal sheath free end, interconnected free ends 113 and 213, and interconnected free ends 123 and 233 are finally globally covered with additional insulation, for example a heat-shrinkable jacket covering the interconnection zone 3 and adjacent portions of the insulating jackets 14 and 24.
Although the present invention has been described hereinabove by way of a non-restrictive illustrative embodiment thereof, this embodiment can be modified at will, within the scope of the appended claims, without departing from the spirit and scope of the present invention.
Electrical and mechanical connection To electrically and mechanically connect a free end 15 of the shielded heating cable 1 to a free end 25 of the power supply cable 2, the following operations are conducted:
- the insulating jacket 14 is stripped from the free end 15 of the shielded heating cable 1 to expose a free end of the metal sheath 13;
- the heating wire elements 11 and 12 are withdrawn from the exposed free end of the metal sheath 13;
- the insulation 112 is stripped from the free end of the heating wire element 11 to expose a free end 113 of the resistance wire 111;
- the insulation 122 is stripped from the free end of the heating wire element 12 to expose a free end 123 of the resistance wire 121;
- the insulation 212 is stripped from the free end of the power supply conductor 21 to exposed a free end 213 of the electrically conductive wire 211;
- the insulation 222 is stripped from the free end of the ground conductor 22 to exposed a free end 223 of the electrically conductive wire 221;
- the insulation 232 is stripped from the free end of the power supply conductor 23 to expose a free end 233 of the electrically conductive wire 231;
- the free end 223 of the electrically conductive wire 221 of the ground 5 conductor 22 is ultrasonically welded to the free end of the metal sheath 13 corresponding to the stripped free end 15 of the shielded heating cable;
- the free ends 113 and 213 are ultrasonically welded; and 10 - the free ends 123 and 233 are ultrasonically welded.
As illustrated in Figure 1, in a zone 3 of interconnection between the shielded heating cable 1 and the power supply cable 2, the interconnected metal sheath 13 and ground conductor 22 have a length shorter than a length of the interconnected heating wire element 11 and power supply conductor 21.
Also, the interconnected metal sheath 13 and ground conductor 22 have, in the zone 3, a length shorter than a length of the interconnected heating wire element 12 and power supply conductor 23. In this manner, in operation, longitudinal tension in the interconnection zone 3 is totally supported by the interconnected metal sheath 13 and ground conductor 22.
Since the heating wire elements 11 and 12 have small-diameter, fragile resistance wires 111 and 121, the construction illustrated in Figure 1 will protect the resistance wires 111 and 121 from rupture or other damage caused by tension in the interconnection zone 3 of the cables 1 and 2.
The loop made with each of the resistance wires 111 and 121 at the point of connection between the shielded heating cable 1 and the power supply cable 2 also provides room to relieve the stress caused by the thermal expansion of the resistance wires 111 and 112 when electrical power is applied. The resistance wires 111 and 121 having a diameter much smaller than the electrically conductive wires 211 and 231 of the power supply cable 2 (non-heating cable), without these loops, all of the expansion stress would be localized at the weakest points of the resistance wires 111 and 121, which would be the points just next to the respective connections with the electrically conductive wires 211 and 231 of the power supply cable 2. Without the loops, there would be a higher probability of having power interruptions due to the breakage of the resistance wires 111 and 121 at these particular points.
Although the non-restrictive illustrative embodiment of the present invention has been described in relation to ultrasonic welding of the wires and sheath, it should be kept in mind that it is within the scope of the present invention to use other types of welding as well as other types of connections.
Also, the interconnected heating wire element 11 and power supply conductor 21 can form a 360°- loop (not shown} in the interconnection zone 3.
The free wire ends 113 and 213 can then be placed side by side in the continuity of both the heating wire element 11 and power supply conductor 21 and ultrasonically welded in this position.
In the same manner, the interconnected heating wire element 12 and power supply conductor 23 can form a 360° loop (not shown) in the interconnection zone 3. The free wire ends 123 and 233 can then be placed side by side in the continuity of both the heating wire element 12 and power supply conductor 23 and ultrasonically welded in this position.
Finally, the interconnected wire free end 223 and metal sheath free end, the interconnected free ends 113 and 213, and the interconnected free ends 123 and 233 are individually insulated using conventional techniques well known to those of ordinary skill in the art. In the same manner the individually insulated interconnected wire free end 223 and metal sheath free end, interconnected free ends 113 and 213, and interconnected free ends 123 and 233 are finally globally covered with additional insulation, for example a heat-shrinkable jacket covering the interconnection zone 3 and adjacent portions of the insulating jackets 14 and 24.
Although the present invention has been described hereinabove by way of a non-restrictive illustrative embodiment thereof, this embodiment can be modified at will, within the scope of the appended claims, without departing from the spirit and scope of the present invention.
Claims (11)
1. A method of electrically and mechanically connecting (a) a shielded heating cable comprising a metal sheath and heating wire elements with (b) a power supply cable comprising a ground conductor and power supply conductors, comprising:
connecting, in a zone of interconnection between the shielded heating cable and the power supply cable, a free end of the metal sheath with a free end of the ground conductor;
connecting, in the interconnection zone, free ends of the heating wire elements with free ends of the power supply conductors, respectively; and making, in the interconnection zone, a length of the interconnected metal sheath and ground conductor shorter than lengths of the interconnected heating wire elements and power supply conductors whereby, in operation, longitudinal tension in the interconnection zone is totally supported by the interconnected metal sheath and ground conductor.
connecting, in a zone of interconnection between the shielded heating cable and the power supply cable, a free end of the metal sheath with a free end of the ground conductor;
connecting, in the interconnection zone, free ends of the heating wire elements with free ends of the power supply conductors, respectively; and making, in the interconnection zone, a length of the interconnected metal sheath and ground conductor shorter than lengths of the interconnected heating wire elements and power supply conductors whereby, in operation, longitudinal tension in the interconnection zone is totally supported by the interconnected metal sheath and ground conductor.
2. The method of claim 1, wherein connecting the free end of the metal sheath with the free end of the ground conductor comprises:
ultrasonically welding the free end of the metal sheath with the free end of the ground conductor.
ultrasonically welding the free end of the metal sheath with the free end of the ground conductor.
3. The method of claim 1, wherein connecting the free ends of the heating wire elements with the free ends of the power supply conductors comprises:
- ultrasonically welding the free ends of the heating wire elements with the free ends of the power supply conductors.
- ultrasonically welding the free ends of the heating wire elements with the free ends of the power supply conductors.
4. The method of claim 1, wherein connecting the free end of the metal sheath with the free end of the ground conductor comprises:
- stripping an insulating jacket of the shielded heating cable to expose the free end of the metal sheath;
- withdrawing the heating wire elements from the exposed free end of the metal sheath;
- stripping insulation from the free end of the ground conductor to expose a free end of an electrically conductive wire of the ground conductor; and - connecting the stripped free end of the metal sheath with the exposed free end of the electrically conductive wire of the ground conductor.
- stripping an insulating jacket of the shielded heating cable to expose the free end of the metal sheath;
- withdrawing the heating wire elements from the exposed free end of the metal sheath;
- stripping insulation from the free end of the ground conductor to expose a free end of an electrically conductive wire of the ground conductor; and - connecting the stripped free end of the metal sheath with the exposed free end of the electrically conductive wire of the ground conductor.
5. The method of claim 4, wherein connecting the stripped free end of the metal sheath with the exposed free end of the electrically conductive wire of the ground conductor comprises:
- ultrasonically welding the stripped free end of the metal sheath with the exposed free end of the electrically conductive wire of the ground conductor.
- ultrasonically welding the stripped free end of the metal sheath with the exposed free end of the electrically conductive wire of the ground conductor.
6. The method of claim 1, wherein connecting the free ends of the heating wire elements with the free ends of the power supply conductors comprises:
- stripping insulation from the free ends of the heating wire elements to expose free ends of resistance wires of the heating wire elements;
- stripping insulation from the free ends of the power supply conductors to expose free ends of electrically conductive wires of the power supply conductors; and - connecting the exposed free ends of the resistance wires of the heating wire elements to the exposed free ends of the electrically conductive wires of the power supply conductors.
- stripping insulation from the free ends of the heating wire elements to expose free ends of resistance wires of the heating wire elements;
- stripping insulation from the free ends of the power supply conductors to expose free ends of electrically conductive wires of the power supply conductors; and - connecting the exposed free ends of the resistance wires of the heating wire elements to the exposed free ends of the electrically conductive wires of the power supply conductors.
7. The method of claim 6, wherein connecting the exposed free ends of the resistance wires of the heating wire elements to the exposed free ends of the electrically conductive wires of the power supply conductors comprises:
- ultrasonically welding the exposed free ends of the resistance wires of the heating wire elements to the exposed free ends of the electrically conductive wires of the power supply conductors.
- ultrasonically welding the exposed free ends of the resistance wires of the heating wire elements to the exposed free ends of the electrically conductive wires of the power supply conductors.
8. A method of electrically and mechanically connecting (a) a first shielded cable comprising a metal sheath and electrical conductors with (b) a second cable comprising a ground conductor and electrical conductors, comprising:
connecting, in a zone of interconnection between the first and second cables, a free end of the metal sheath with a free end of the ground conductor;
connecting, in the interconnection zone, free ends of the electrical conductors of the first cable with free ends of the electrical conductors of the second cable, respectively; and making, in the interconnection zone, a length of the interconnected metal sheath and ground conductor shorter than lengths of the interconnected electrical conductors of the first cable and electrical conductors of the second cable whereby, in operation, longitudinal tension in the interconnection zone is totally supported by the interconnected metal sheath and ground conductor.
connecting, in a zone of interconnection between the first and second cables, a free end of the metal sheath with a free end of the ground conductor;
connecting, in the interconnection zone, free ends of the electrical conductors of the first cable with free ends of the electrical conductors of the second cable, respectively; and making, in the interconnection zone, a length of the interconnected metal sheath and ground conductor shorter than lengths of the interconnected electrical conductors of the first cable and electrical conductors of the second cable whereby, in operation, longitudinal tension in the interconnection zone is totally supported by the interconnected metal sheath and ground conductor.
9. An electrical and mechanical connection between (a) a shielded heating cable comprising a metal sheath and heating wire elements and (b) a power supply cable comprising a ground conductor and power supply conductors, comprising:
a zone of interconnection between the shielded heating cable and the power supply cable;
in the interconnection zone, a first connection between a free end of the metal sheath and a free end of the ground conductor; and in the interconnection zone, second connections between free ends of the heating wire elements and free ends of the power supply conductors, respectively;
wherein, in the interconnection zone, the interconnected metal sheath and ground conductor have a first length shorter than second lengths of the interconnected heating wire elements and power supply conductors whereby, in operation, longitudinal tension in the interconnection zone is totally supported by the interconnected metal sheath and ground conductor.
a zone of interconnection between the shielded heating cable and the power supply cable;
in the interconnection zone, a first connection between a free end of the metal sheath and a free end of the ground conductor; and in the interconnection zone, second connections between free ends of the heating wire elements and free ends of the power supply conductors, respectively;
wherein, in the interconnection zone, the interconnected metal sheath and ground conductor have a first length shorter than second lengths of the interconnected heating wire elements and power supply conductors whereby, in operation, longitudinal tension in the interconnection zone is totally supported by the interconnected metal sheath and ground conductor.
10. The connection of claim 9, wherein the first and second connections comprises ultrasonically welded connections.
11. An electrical and mechanical connection between (a) a first shielded cable comprising a metal sheath and electrical conductors and (b) a second cable comprising a ground conductor and electrical conductors, comprising:
a zone of interconnection between the first and second cables;
in the interconnection zone, a first connection between a free end of the metal sheath and a free end of the ground conductor; and in the interconnection zone, second connections between free ends of the electrical conductors of the first cable and free ends of the electrical conductors of the second cable, respectively;
wherein, in the interconnection zone, the interconnected metal sheath and ground conductor have a first length shorter than second lengths of the interconnected electrical conductors of the first cable and electrical conductors of the second cable whereby, in operation, longitudinal tension in the interconnection zone is totally supported by the interconnected metal sheath and ground conductor.
a zone of interconnection between the first and second cables;
in the interconnection zone, a first connection between a free end of the metal sheath and a free end of the ground conductor; and in the interconnection zone, second connections between free ends of the electrical conductors of the first cable and free ends of the electrical conductors of the second cable, respectively;
wherein, in the interconnection zone, the interconnected metal sheath and ground conductor have a first length shorter than second lengths of the interconnected electrical conductors of the first cable and electrical conductors of the second cable whereby, in operation, longitudinal tension in the interconnection zone is totally supported by the interconnected metal sheath and ground conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002456687A CA2456687C (en) | 2004-02-02 | 2004-02-02 | Tension-resistant connection between a shielded heating cable and a power supply cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002456687A CA2456687C (en) | 2004-02-02 | 2004-02-02 | Tension-resistant connection between a shielded heating cable and a power supply cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2456687A1 CA2456687A1 (en) | 2005-08-02 |
| CA2456687C true CA2456687C (en) | 2009-10-20 |
Family
ID=34865807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002456687A Expired - Lifetime CA2456687C (en) | 2004-02-02 | 2004-02-02 | Tension-resistant connection between a shielded heating cable and a power supply cable |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2456687C (en) |
-
2004
- 2004-02-02 CA CA002456687A patent/CA2456687C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2456687A1 (en) | 2005-08-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2493643C2 (en) | Assembly for splicing electric cables with braided shield | |
| US5028742A (en) | Cable shield connector | |
| BR112017010223B1 (en) | UNITED POWER CORD AND MANUFACTURING METHOD OF THE SAME | |
| US20090260847A1 (en) | Data Transmission Cable and Method for Producing a Data Transmission Cable | |
| US9979167B1 (en) | Device and method for splicing shielded wire cables | |
| JP5053466B2 (en) | Terminal structure of superconducting cable conductor | |
| CA2527244C (en) | Heating cable | |
| KR102625955B1 (en) | Connecting Conductor For Connecting Different Conductor And Conneting Joint Of Power Cable | |
| JP2020061371A (en) | Conductive water blocking material including metallic particles, optical cable, and method of constructing optical cable including the same | |
| JP2007325441A (en) | Method for connecting return path conductor of dc coaxial power cable | |
| US6973721B2 (en) | Tension-resistant connection between a shielded heating cable and a power supply cable | |
| CN102255213B (en) | Method for connecting return conductors of power supply DC coaxial cables | |
| CA2456687C (en) | Tension-resistant connection between a shielded heating cable and a power supply cable | |
| CN108879119B (en) | Cable connection assembly and cable connection method | |
| CN107221824B (en) | Method for processing shielding layer at cable butt joint | |
| US9431726B2 (en) | Multi-core cable | |
| US3138656A (en) | Electric cable connection | |
| CN101385211B (en) | Method for connecting return conductors of power supply DC coaxial cables and connection portion between power supply dc coaxial cables | |
| JP2020170642A (en) | Litz wire branch connection part and branch connection method | |
| JP4897952B2 (en) | DC coaxial cable connection for power | |
| JP3728792B2 (en) | Conductive cable | |
| US20050141832A1 (en) | Armouring joint, an armoured cable joint and a method for jointing armouring of two armoured cables | |
| US11837386B2 (en) | Reinforced water barrier over a joint | |
| CN108337755B (en) | Induction heating extension cable comprising control wires | |
| KR102625957B1 (en) | Connecting Conductor For Connecting Different Conductor, Manufacturing Method Of Connecting Conductor And Conneting Device Of Power Cable |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20240202 |