GB2030793A - Cable terminations and means for making them - Google Patents
Cable terminations and means for making them Download PDFInfo
- Publication number
- GB2030793A GB2030793A GB7927235A GB7927235A GB2030793A GB 2030793 A GB2030793 A GB 2030793A GB 7927235 A GB7927235 A GB 7927235A GB 7927235 A GB7927235 A GB 7927235A GB 2030793 A GB2030793 A GB 2030793A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gland
- cable
- spigot
- layer
- gripping
- 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- Withdrawn
Links
Classifications
-
- 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
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/06—Joints for connecting lengths of protective tubing or channels, to each other or to casings, e.g. to distribution boxes; Ensuring electrical continuity in the joint
- H02G3/0616—Joints for connecting tubing to casing
- H02G3/0625—Joints for connecting tubing to casing with means for preventing disengagement of conductors
- H02G3/0666—Joints for connecting tubing to casing with means for preventing disengagement of conductors with means clamping the armour of the conductor
-
- 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
- H02G15/02—Cable terminations
- H02G15/04—Cable-end sealings
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Insulating Bodies (AREA)
Abstract
A cable gland has a spigot (2) projecting into an internal open space thereof. This receives a composite heat-shrinkable sleeve (3), which may be enclosed within the gland body. <IMAGE>
Description
SPECIFICATION
Cable terminations and means for making them
This invention relates to the termination of electric cables having a metallic sheathing layer (which may be an extruded or welded sheath, a tape armour layer, a screen, or wire armour) to which an electrical connection is required. More especially, though not exclusively, it is concerned with the termination of paper insulated, lead sheathed cables. Mechanical sealing glands with lead rings can be used with these cables, but especially in the case of glands with a good range-taking capacity there is a risk of over-tightening resulting in deformation of the lead sheath and consequently in damage to the underlying papers.
Our related application 38313/78 (serial
No. 2005091 A) claims a method of terminating a cable having a metallic sheathing layer comprising the steps of surrounding the sheathing layer with a composite tube comprising an outer sleeve of distended elasticmemory material and an inner sleeve of metal, inserting a contact member between the composite tube and the sheathing layer and thereafter heating the composite tube to the recovery temperature of the elastic memory material, the materials and dimensions of the composite tube being such that on heating the sleeve to its recovery temperature the metallic sleeve is softened (but not melted) and the forces generated in the outer sleeve are sufficient to deform the metallic sleeve into contact with the sheathing layer and the contact member.
In accordance with the present invention, a cable terminating gland, suitable for use in the method of application 38313/78, Serial
No 2005091, is distinguished by a spigot projecting into an open internal space thereof.
Usually the spigot will be on a tubular member through which the cable passes.
More especially, it is preferable for it to be on a member of a gland gripping one or more than one other layer of the cable, for example the cone of a grip for a wire-armour layer over the sheathing layer. In such cases the composite sleeve may be enclosed by the gland in the finished termination.
The spigot may have smooth or angular ribs or other gripping formations on its outer surface to increase the mechanical strength of the connection.
The accompanying drawings illustrate the use of the invention in terminating wire-armoured lead sheathed paper insulated cables.
Figures 1 and 2 are each composite sketches, the upper half of each figure showing the parts of a complete gland as supplied and the lower half the finished termination.
Figure 3 is a more detailed drawing of two components of the gland of Fig. 1 (in the assupplied condition) and
Figures 4-5 show the corresponding components of a further design in the as-supplied and finished condition respectively.
As seen in Figs. 1 and 3, the armour cone 1 of an otherwise conventional gland is modified to provide a spigot 2 with annular ribs on its outer surface. Over this fits a composite tube 3 comprising an inner sleeve 4 of pure lead and an outer sleeve 5 of irradiated polyethylene that is heat-recoverable. On heating to the recovery temperature (about 1 30 C) the ends of the composite tube collapse into firm gripping, sealing and contact-making engagement with the spigot 2 and the sheath of a cable 6.
The glands of Fig. 2 and 5 are identical except that the composite tubes 3 are tapered; in Fig. 2 uniformly from end to end and in Fig. 4 over a central part joining end parts of uniform but different diameters.
CLAIMS (27 Sep 1978)
1. A cable terminating gland, distinguished by a spigot projecting into an open internal space thereof.
2. A gland as claimed in Claim 1 in which the spigot is on a member of a gland gripping at least one other layer of the cable.
3. A gland as claimed in Claim 2 in which the member is the cone of a grip for a wirearmour layer.
4. A gland as claimed in any one of the preceding claims in which the spigot has ribs or other gripping formation on its outer surface.
5. A cable termination made by means of the gland claimed in any one of the preceding
Claims.
CLAIMS (30 Nov 1979)
1. A cable terminating gland, distinguished by an annular spigot projecting from an annular end-face of one main gland member into an open internal space thereof enclosed by another main gland member.
2. A gland as claimed in Claim 1 in which the spigot is on a member of the gland gripping at least one layer of the cable.
3. A terminating gland for a wire-armoured cable having a cone grip for a wirearmour layer and distinguished by an annular spigot projecting from an annular end-face of the gripping cone into an open internal space of the gland enclosed by another main gland member.
4. A gland as claimed in any one of the preceding claims in which the spigot has ribs or other gripping formations on its outer surface.
5. A cable termination made by means of the gland claimed in any one of the preceding claims.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (5)
1. A cable terminating gland, distinguished by a spigot projecting into an open internal space thereof.
2. A gland as claimed in Claim 1 in which the spigot is on a member of a gland gripping at least one other layer of the cable.
3. A gland as claimed in Claim 2 in which the member is the cone of a grip for a wirearmour layer.
4. A gland as claimed in any one of the preceding claims in which the spigot has ribs or other gripping formation on its outer surface.
5. A cable termination made by means of the gland claimed in any one of the preceding claims.
5. A cable termination made by means of the gland claimed in any one of the preceding
Claims.
CLAIMS (30 Nov 1979)
1. A cable terminating gland, distinguished by an annular spigot projecting from an annular end-face of one main gland member into an open internal space thereof enclosed by another main gland member.
2. A gland as claimed in Claim 1 in which the spigot is on a member of the gland gripping at least one layer of the cable.
3. A terminating gland for a wire-armoured cable having a cone grip for a wirearmour layer and distinguished by an annular spigot projecting from an annular end-face of the gripping cone into an open internal space of the gland enclosed by another main gland member.
4. A gland as claimed in any one of the preceding claims in which the spigot has ribs or other gripping formations on its outer surface.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4018977 | 1977-09-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB2030793A true GB2030793A (en) | 1980-04-10 |
Family
ID=10413660
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7927235A Withdrawn GB2030793A (en) | 1977-09-27 | 1978-09-27 | Cable terminations and means for making them |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2030793A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2171855B (en) * | 1985-02-26 | 1989-03-01 | Egerton A C Ltd | Cable entry seal |
-
1978
- 1978-09-27 GB GB7927235A patent/GB2030793A/en not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2171855B (en) * | 1985-02-26 | 1989-03-01 | Egerton A C Ltd | Cable entry seal |
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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) |