GB2088621A - An electric cable - Google Patents

An electric cable Download PDF

Info

Publication number
GB2088621A
GB2088621A GB8135305A GB8135305A GB2088621A GB 2088621 A GB2088621 A GB 2088621A GB 8135305 A GB8135305 A GB 8135305A GB 8135305 A GB8135305 A GB 8135305A GB 2088621 A GB2088621 A GB 2088621A
Authority
GB
United Kingdom
Prior art keywords
sheath
cable
mineral insulated
conductor
mineral
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.)
Withdrawn
Application number
GB8135305A
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.)
Balfour Beatty PLC
Original Assignee
BICC PLC
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 BICC PLC filed Critical BICC PLC
Priority to GB8135305A priority Critical patent/GB2088621A/en
Publication of GB2088621A publication Critical patent/GB2088621A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/16—Rigid-tube cables

Landscapes

  • Insulated Conductors (AREA)
  • Manufacturing Of Electric Cables (AREA)

Abstract

A mineral insulated cable comprising one or more than one electrical conductor of aluminium or an aluminium-based alloy embedded in, and insulated from a surrounding sheath of steel by, compacted mineral insulating powder.

Description

SPECIFICATION An electric cable This invention relates to a mineral insulated cable comprising one or more than one electrical conductor of a metal or metal alloy embedded in, and insulated from a surrounding sheath of metal or metal alloy by, compacted mineral insulating powder, usually magnesium oxide.
According to the present invention, in a mineral insulated cable as hereinbefore described, the or each conductor is of aluminium-based alloy, and the sheath is of steel.
The sheath may be of mild steel, but preferably the sheath is of stainless steel.
The mineral insulated cable of the present invention has an important advantage over mineral insulated cables hitherto proposed and used, in that no copper is used in the cable so that the cable is lighter in weight than known mineral insulated cables of the same size and can be substantially cheaper.
Furthermore, the cable of this invention is particularly suitable for manufacture by the method described and claimed in the Complete Specification of our UK patent No.
1 554859 in which a metallic tape and at least one metallic conductor rod are fed continuously substantially vertically downwards towards tube reducing means, the advancing metallic tape is folded transversely around the advancing conductor rod or rods until the longitudinal edges of the tape abut to form a sheath tube from which the or each conductor rod is maintained positively appropriately spaced, the abutting longitudinal edges of the advancing folded metallic tape are welded or otherwise permanently secured together, and the sheath tube so formed containing the conductor rod or rods and free flowing mineral insulated powder is drawn substantially vertically downwards through the tube reducing means.
1. A mineral insulated cable as hereinbefore described, in which the or each conductor is of aiuminium or an aluminium-based alloy, and the sheath is of steel.
2. A mineral insulated cable as claimed in Claim 1, wherein the sheath is of stainless steel.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (2)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION An electric cable This invention relates to a mineral insulated cable comprising one or more than one electrical conductor of a metal or metal alloy embedded in, and insulated from a surrounding sheath of metal or metal alloy by, compacted mineral insulating powder, usually magnesium oxide. According to the present invention, in a mineral insulated cable as hereinbefore described, the or each conductor is of aluminium-based alloy, and the sheath is of steel. The sheath may be of mild steel, but preferably the sheath is of stainless steel. The mineral insulated cable of the present invention has an important advantage over mineral insulated cables hitherto proposed and used, in that no copper is used in the cable so that the cable is lighter in weight than known mineral insulated cables of the same size and can be substantially cheaper. Furthermore, the cable of this invention is particularly suitable for manufacture by the method described and claimed in the Complete Specification of our UK patent No. 1 554859 in which a metallic tape and at least one metallic conductor rod are fed continuously substantially vertically downwards towards tube reducing means, the advancing metallic tape is folded transversely around the advancing conductor rod or rods until the longitudinal edges of the tape abut to form a sheath tube from which the or each conductor rod is maintained positively appropriately spaced, the abutting longitudinal edges of the advancing folded metallic tape are welded or otherwise permanently secured together, and the sheath tube so formed containing the conductor rod or rods and free flowing mineral insulated powder is drawn substantially vertically downwards through the tube reducing means. CLAIMS
1. A mineral insulated cable as hereinbefore described, in which the or each conductor is of aiuminium or an aluminium-based alloy, and the sheath is of steel.
2. A mineral insulated cable as claimed in Claim 1, wherein the sheath is of stainless steel.
GB8135305A 1980-11-25 1981-11-24 An electric cable Withdrawn GB2088621A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8135305A GB2088621A (en) 1980-11-25 1981-11-24 An electric cable

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8037688 1980-11-25
GB8135305A GB2088621A (en) 1980-11-25 1981-11-24 An electric cable

Publications (1)

Publication Number Publication Date
GB2088621A true GB2088621A (en) 1982-06-09

Family

ID=26277616

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8135305A Withdrawn GB2088621A (en) 1980-11-25 1981-11-24 An electric cable

Country Status (1)

Country Link
GB (1) GB2088621A (en)

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)