US3243500A - Mineral-filled cable connection - Google Patents

Mineral-filled cable connection Download PDF

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Publication number
US3243500A
US3243500A US320148A US32014863A US3243500A US 3243500 A US3243500 A US 3243500A US 320148 A US320148 A US 320148A US 32014863 A US32014863 A US 32014863A US 3243500 A US3243500 A US 3243500A
Authority
US
United States
Prior art keywords
cable
case
powder
cables
sleeve
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
Application number
US320148A
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English (en)
Inventor
Rabinowitz Azriel Jay
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FCI USA LLC
Original Assignee
Burndy Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Burndy Corp filed Critical Burndy Corp
Priority to US320148A priority Critical patent/US3243500A/en
Priority to GB43297/64A priority patent/GB1022390A/en
Priority to NL6412502A priority patent/NL6412502A/xx
Priority to CH1394364A priority patent/CH417723A/fr
Priority to BE654939D priority patent/BE654939A/xx
Priority to DE1964B0079150 priority patent/DE1465329B1/de
Application granted granted Critical
Publication of US3243500A publication Critical patent/US3243500A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • H01R4/58—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 characterised by the form or material of the contacting members
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable

Definitions

  • This invention relates generally to mineral-insulated cable connections and, more particularly, to a mineralfilled connection for. joining together mineral-insulated cables. 7
  • Mineral-insulated cable commonly known simply as MI cable, generally comprises one or more high conductivity conductors spaced and insulated from one another by finely divided magnesium oxide powder encased and compressed within a moisture-proof flexible metal sheath.
  • the cable is usually used as a self-contained resistance heating element for preventing ice formation on driveways, rain gutters and the like.
  • it has also been employed in power transmission applications in lieu of conduit-encased conductors.
  • MI cable connection techniques have been used to achieve these ends.
  • One method among those previously known involves baring and connecting the conductors at the ends of two cables, positioning a relatively large diameter tubular sleeve around the cable ends at the joined conductors, plugging one end of the sleeve around one cable, positioning the sleeve vertically while axially filling it with powder insulation from the unplugged end, then plugging the second end, and finally crimping or otherwise securing each end of the tubular sleeve to the sheath of the corresponding cable.
  • This method suffers from the difliculty and inconvenience of axially filling the sleeve through a peripheral opening at one end, as well as from the inability to inspect for complete filling and proper powder distribution, and from the necessity of positioning the partly completed joint vertically during filling.
  • FIGURE 1 is a plan view of a connection formed in accordance with this invention, shown partly sectioned along the longitudinal axis to illustrate the novel inner construction;
  • FIGURE 2 is a plan view of the open side tubular insulation support which forms a part of the connection of FIGURE 1;
  • FIGURE 3 is a transverse sectional view taken in the plane 33 of FIGURE 1;
  • FIGURE 4 is a longitudinally sectioned view of a modified form of connection employing a reducer plug
  • FIGURE 5 is a pictorial view of the reducer plug employed in FIGURE 4.
  • FIGURE 6 is a pictorial view of the modified insulation support employed in the modified connection of FIG URE 4. 1
  • the invention comprises a connection incorporating a powder case which is basically a tubular element provided with a longitudinal opening such as an open seam. Powdered magnesium oxide is poured into the joint through the opening of the powder case. Except for the longitudinal opening, the case substantially encircles the ends of the MI cable being connected.
  • connection is provided with an outer sleeve 10, which may be indented at each end, as at 12 and 14, to MI cables 16 and 18 respectively.
  • the ends of the cables are stripped back, exposing the bared conductors 20 and 22.
  • These are spliced together by means of copper or similar splicing sleeves 24 and 25 which are crimped to the opposed ends of the corresponding pairs.
  • the powder case illustrated in FIGURES 1 and 2 cornprises the tubular sleeve 26 which encloses the ends of the MI cable, the open, longitudinally extending seam 28 being expandable to accommodate different cable sizes.
  • the case may advantageously be made of springy material, such as beryllium copper to resiliently grip and secure the cable ends in position.
  • the powder case in this embodiment is preferably made slightly smaller in inside diameter than the outside diameter of the MI cable.
  • the wall thickness, for a case made of beryllium copper, may be as little as .005", which is sufiicient to produce the desired gripping action in a sleeve of ordinary resiliency.
  • This powder case design permits several sizes of MI cables to be accommodated, since the seam will merely open wider, or close narrower, depending on whether a larger or smaller cable is being spliced.
  • Powdered magnesium oxide 30 similar or identical to the insulation within cables 16 and 18 is evenly distributed over the spliced conductors, through the open seam 28, after conductors 20 and 22 have been prepared and the powder case has been positioned.
  • the conductors within the connection are thus surrounded and spaced apart by the insulating magnesium oxide when the powder case is completely filled.
  • the outer compression sleeve 10 which has previously been positioned over one of the cables, may be slid along the cable over the powder case and indented in position to form a completed, sealed and insulated connection.
  • an upset tab 32 is formed adjacent each end of the powder case to abut and position the opposed ends of the MI cables.
  • the tabs maintain spacing of the cables during the powder filling operation and insure proper positioning of the spliced conductors.
  • an adaptor 40 may be employed, as shown in FIGURE 4.
  • the adaptor preferably made of metal, is formed with an outside diameter substantially corresponding to the inside diameter of the compression sleeve 10a, but with sufiicient clearance to permit the compression sleeve to slide thereover.
  • the adaptor is provided with a reduced diameter portion 42, to permit its inserti-on within the end of the powder container.
  • An inner bore 44 permits the MI cable 16a to be inserted therein.
  • the shouldered portion 42 may be crimped to the MI seamless end 48, which encircles the MI cable 181:.
  • the powder case 26a illustrated in FIGURE 6 and shown in use in FIGURE 4 is a modification of the sleeve illustrated in FIGURE 1, and is especially useful with adaptors such as illustrated. It is formed with a
  • the seamless end 48 also extends under the compression sleeve 10a to permit indentation of the compression sleeve through the seamless end 48 to the MI cable 18a.
  • the seam opening 28a extends over the open conductors 20a and 22a, and over the adaptor shoulder 42.
  • the spliced connection embodying this invention forms a moisture-proof joint, wherein the voltage and temperature rating of the connection approaches that of the MI cable itself.
  • the joint eliminates potting compounds, and brazing techniques hitherto employed. End tamping or filler plugs are avoided with an accompanying saving in time and skilled labor.
  • the present invention permits of visual inspection of the soundness of the joint during completion, which is a decided improvement over end-filling wherein such inspection is not possible.
  • the installer in end-filling the installer must continuously tamp the inserted powder until it feels firm. If excess powder is accidently inserted 'endwise, the joint must be tilted or reversed in vertical position to pour out the excess.
  • Joints made by the end-filling method further require a sealing sleeve of finite thickness which must be inserted between the cable sheath and outer sleeve and then secured in position; as a result, end-filled connections generally require larger outer compression sleeves than connections made in accordance with this invention.
  • An insulating splice connection comprising: a first electrical cable of the type having a conductor enclosed within a flexible metal sheath which is filled with powdered insulating material; a second electrical cable; an exposed conductor extending from one end of said first cable; an exposed conductor extending from one end of said second cable; .a tubular powder case having the opposite ends thereof fitted over the ends of said first and second cables respectively; said exposed conductors beinterconnected within said case; an open longitudinal slit portion in said powder case of permitting introduction of loose powder insulating material into the interior of said case; powder insulating material filling the interior volume of said case between said first and'second cables and surrounding the exposed conductors therein; and, an outer sleeve enclosing said powder case and covering the said longitudinal slit portion; said sleeve being sealed to said cables at the ends thereof.
  • connection of claim '1 wherein the powder case is provided with at least one inward-1y extending pro jection abutting the end of one of the cables and positioning the case relative thereto.
  • connection of claim 3 wherein the outer sleeve is compressed to the exterior periphery of the cables to seal the connection therebetween.
  • connection of claim 1 wherein the outer sleeve is compressed to at least one of the cables through the powder case.
  • connection of claim 6 wherein an adaptor is provided tor one end of the powder case, said adaptor having a central bore and an end portion of reduced diameter inserted into the powder case, and a cable having a diameter less than the interior of said powder case is positioned within the bore of the adaptor.

Landscapes

  • Cable Accessories (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
US320148A 1963-10-30 1963-10-30 Mineral-filled cable connection Expired - Lifetime US3243500A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US320148A US3243500A (en) 1963-10-30 1963-10-30 Mineral-filled cable connection
GB43297/64A GB1022390A (en) 1963-10-30 1964-10-23 Mineral filled cable connection
NL6412502A NL6412502A (de) 1963-10-30 1964-10-27
CH1394364A CH417723A (fr) 1963-10-30 1964-10-28 Connexion isolée entre les extrémités de deux câbles électriques
BE654939D BE654939A (de) 1963-10-30 1964-10-28
DE1964B0079150 DE1465329B1 (de) 1963-10-30 1964-10-30 Verbindung zwischen zwei mehrere voneinander isolierte Leiter enthaltenden Kabeln

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US320148A US3243500A (en) 1963-10-30 1963-10-30 Mineral-filled cable connection

Publications (1)

Publication Number Publication Date
US3243500A true US3243500A (en) 1966-03-29

Family

ID=23245085

Family Applications (1)

Application Number Title Priority Date Filing Date
US320148A Expired - Lifetime US3243500A (en) 1963-10-30 1963-10-30 Mineral-filled cable connection

Country Status (6)

Country Link
US (1) US3243500A (de)
BE (1) BE654939A (de)
CH (1) CH417723A (de)
DE (1) DE1465329B1 (de)
GB (1) GB1022390A (de)
NL (1) NL6412502A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3458648A (en) * 1967-10-11 1969-07-29 Wiegand Co Edwin L Electrical connector
US4266992A (en) * 1977-09-30 1981-05-12 Les Cables De Lyon Method for end to end connection of mineral-insulated electric cable and assembly for same
US5600096A (en) * 1994-09-27 1997-02-04 The Whitaker Corporation Mechanical connector splice for cable
US5683273A (en) * 1996-07-24 1997-11-04 The Whitaker Corporation Mechanical splice connector for cable
US5821463A (en) * 1996-06-14 1998-10-13 The Whitaker Corporation Mechanical connector splice for cable
US20070127552A1 (en) * 2005-12-02 2007-06-07 Bronnert Herve X RTD sensor connector seal
US20120084978A1 (en) * 2010-10-08 2012-04-12 Carrie Elizabeth Hartford Compaction of electrical insulation for joining insulated conductors
JP2014514711A (ja) * 2011-04-08 2014-06-19 シエル・インターナシヨナル・リサーチ・マートスハツペイ・ベー・ヴエー 絶縁導体を接合するための電気的絶縁物の圧密化
USD840016S1 (en) * 2016-03-08 2019-02-05 Hunter Fan Company Ceiling fan motor housing
USD905792S1 (en) * 2019-04-23 2020-12-22 Igt Electronic gaming station
USD1001734S1 (en) * 2019-01-16 2023-10-17 Saint-Augustin Canada Electric Inc. Bus bar for wind turbine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2832558A1 (fr) * 2001-11-22 2003-05-23 Framatome Connectors Int Manchon d'accouplement d'un cable a isolant mineral et procede de raccordement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US297927A (en) * 1884-04-29 goebel
GB461239A (en) * 1934-08-08 1937-02-08 Le Conducteur Electr Blinde In Improvements in or relating to end fittings or joint fittings for electric cables having compressed mineral powder insulation
US3146299A (en) * 1962-07-05 1964-08-25 Union Carbide Corp Mineral insulated cable connector

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1689420A (en) * 1923-03-26 1928-10-30 Nelson E Buck Cable joint

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US297927A (en) * 1884-04-29 goebel
GB461239A (en) * 1934-08-08 1937-02-08 Le Conducteur Electr Blinde In Improvements in or relating to end fittings or joint fittings for electric cables having compressed mineral powder insulation
US3146299A (en) * 1962-07-05 1964-08-25 Union Carbide Corp Mineral insulated cable connector

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3458648A (en) * 1967-10-11 1969-07-29 Wiegand Co Edwin L Electrical connector
US4266992A (en) * 1977-09-30 1981-05-12 Les Cables De Lyon Method for end to end connection of mineral-insulated electric cable and assembly for same
US5600096A (en) * 1994-09-27 1997-02-04 The Whitaker Corporation Mechanical connector splice for cable
US5821463A (en) * 1996-06-14 1998-10-13 The Whitaker Corporation Mechanical connector splice for cable
US5683273A (en) * 1996-07-24 1997-11-04 The Whitaker Corporation Mechanical splice connector for cable
US20070127552A1 (en) * 2005-12-02 2007-06-07 Bronnert Herve X RTD sensor connector seal
US7600914B2 (en) * 2005-12-02 2009-10-13 Bronnert Herve X RTD sensor connector seal
US8943686B2 (en) * 2010-10-08 2015-02-03 Shell Oil Company Compaction of electrical insulation for joining insulated conductors
US20120084978A1 (en) * 2010-10-08 2012-04-12 Carrie Elizabeth Hartford Compaction of electrical insulation for joining insulated conductors
JP2014514711A (ja) * 2011-04-08 2014-06-19 シエル・インターナシヨナル・リサーチ・マートスハツペイ・ベー・ヴエー 絶縁導体を接合するための電気的絶縁物の圧密化
AU2012254060B2 (en) * 2011-04-08 2015-07-09 Shell Internationale Research Maatschappij B.V. Compaction of electrical insulation for joining insulated conductors
USD840016S1 (en) * 2016-03-08 2019-02-05 Hunter Fan Company Ceiling fan motor housing
USD1001734S1 (en) * 2019-01-16 2023-10-17 Saint-Augustin Canada Electric Inc. Bus bar for wind turbine
USD1001735S1 (en) * 2019-01-16 2023-10-17 Saint-Augustin Canada Electric Inc. Bus bar for wind turbine
USD1005951S1 (en) * 2019-01-16 2023-11-28 Saint-Augustin Canada Electric Inc. Bus bar for wind turbine
USD905792S1 (en) * 2019-04-23 2020-12-22 Igt Electronic gaming station

Also Published As

Publication number Publication date
DE1465329B1 (de) 1970-03-26
NL6412502A (de) 1965-05-03
CH417723A (fr) 1966-07-31
GB1022390A (en) 1966-03-09
BE654939A (de) 1965-04-28

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