JPS63250081A - Terminal connection of low voltage service entrance wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for connecting a low-voltage drop-in line, particularly when a polyethylene insulated vinyl sheathed cable (hereinafter referred to as C-cable) is used as the drop-in line.

[Conventional technology and its problems]

The insulating layer of the insulated core wire of a Cv cable is formed by extruding natural colored polyethylene onto the conductor and applying colored ink to the surface to differentiate the core wire color, or by coloring the tape attached to the conductor. The core wires are separated by color.

By the way, although polyethylene has excellent electrical properties, it has a drawback in weather resistance, and when natural-colored polyethylene is exposed to the sun, the insulating surface becomes rough in a short period of time.

Therefore, when using a CV cable as a drop-in wire, stripping off the PVC sheath at the terminal, branching the insulated core wire, and connecting it to the insulated wire extending beyond it, conventional methods have been to overlay adhesive vinyl tape over the exposed insulated core wire. The insulating layer is protected by winding.

However, winding the adhesive vinyl tape is a manual process and is extremely troublesome.

Furthermore, it is extremely difficult and requires skill to wrap the adhesive tape over and over the branched portions (separated portions) of the insulated core wire from which the vinyl chloride sheath has been removed. Furthermore, in the case of high-voltage cable connections, electrical wire manufacturers supply adhesive vinyl tapes that have been carefully examined for weather resistance and aging resistance, and are used for construction, but in the case of low-voltage cables, commercially available adhesive vinyl tapes are supplied. Moreover, since it is wound under tension, there are problems such as cracks and slits forming within a short period of time. For this reason, effective measures for terminal connection processing of low-voltage drop-in lines are eagerly awaited.

[Purpose of the invention]

In view of the above points, it is an object of the present invention to provide a terminal connection method that facilitates terminal processing when a C-cable or the like is used as a lead-in line, and improves the weather resistance and aging resistance of the terminal connection part. With the goal.

[Means to achieve a goal]

In order to achieve the above object, in the present invention, the outer sheath of the cable terminal is stripped, the interposition between the insulated core wires is removed, the twisted insulated core wires are untwisted and branched, and the insulated core wires are separated. After stripping the terminal insulation to expose the conductor, the cable terminal is provided with a portion that fits into the sheath end of the cable, a bulging portion that extends continuously from the fitting portion, and a blockage of the bulging portion. A branch pipe extending from around the front surface is covered with a terminal camp consisting of a branch pipe, and the fitted portion is fitted to the end of the outer sheath, and the insulated core wire is inserted into the branch pipe through the enlarged diameter portion to branch. The exposed conductor protruding from the pipe is connected to the insulated conductor of the indoor wiring cable, and the connection is insulated.

[Effect]

In the terminal connection method configured in this way, the insulated core wire expands outward by untwisting, but due to the presence of the expanded diameter part of the terminal cap, the insulated core wire is inserted into the branch pipe while absorbing this expansion. It is possible.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, as shown in FIG. 4, the terminal cap A used in the terminal connection method according to the present invention includes a cylindrical fitting portion 1,
It consists of an expanded diameter portion 2 that extends continuously forward from the fitted portion 1, and a branch pipe 3 that continuously extends forward from around the closed front surface of this expanded diameter portion 2, and has good weather resistance and aging resistance. It is manufactured from a material such as a vinyl chloride composition.

The fitted portion 1 has an inner diameter that fits snugly into the outer sheath of the C■ cable, and its length is appropriately selected.

Expanded diameter portion 2 exposes the insulated core wire of the C■ cable, which will be described later as a lead-in wire, and when the cable is untwisted, the insulated core wire spreads out, and in this expanded state, the cable can be easily covered with CARP A. The maximum inner diameter is about 1.5 times the diameter of the fitted portion 1, and the length is about 0.9 to 2.5 times the diameter.

The length of the branch pipe 3 may be determined appropriately taking into account the ease of connection work described below, and is usually at least 8 times the diameter, preferably at least 10 times, and more preferably about 15 times the diameter. Moreover, it is preferable that the lengths of the branch pipes 3 are made different by cutting or the like so that the conductor connection parts described later do not come into contact with each other due to deviations.

Next, a method for connecting the terminals of a low-voltage drop-in line according to the present invention using this cap A will be explained.

First, as shown in FIG.
A low-voltage drop-in line a is drawn into customer building B. When the drop-in line a is a C■ cable, a messenger wire 14 is strung between the pillar and the building 8, and the drop-in line a is suspended from the messenger wire 14 via a cable hanger. This lead-in line a is connected to an indoor wiring cable b, for example, a vinyl insulated vinyl sheathed cable, before entering the building B.

In this connection work, as shown in FIG. 2, the sheath 15 at the end of the cable a is stripped off to a required length, the insulated core wire 16 is untwisted, the jute interposition 17 is removed, and the insulated core wire 16 is branched. At the same time, the end insulation 18 of the insulated core wire 16 is connected to the crimp terminal 2.
Peel off the length that can be crimped.

In this way, the insulated core wire 16 is exposed and the cap A according to the present invention is fitted to the end of the cable a, and the insulated core wire 16 is inserted from the fitted portion 1 and inserted into the branch pipe 3, The fitted portion 1 is fitted into the cable sheath 15 to be in the state shown in FIG. 3. At this time, the branched insulated core wire 1
The length of the insulating layer 6 is determined so that the insulating layer 18 slightly protrudes from the branch pipe 3.

Next, the end insulation 18 is peeled off and the crimp terminal 20 is crimped onto the exposed conductor 19, and the
Strip the sheath and insulating layer to the desired length, crimp the crimp terminal similar to C ■ Cable a to the exposed conductor, overlap the ring parts of both crimp terminals, and connect them by tightening with bolts. Branch pipes 3 and V on the connection and on the end cap A
Adhesive insulating tape is wrapped over the insulation gap of the V cable b to complete the drop-in line connection.

During this connection work, even if the branch insulated core wire 16 is bent for construction reasons, there is play between the cap A and the insulated core wire 16 due to the presence of the enlarged diameter portion 2, so no stress is generated between them. , the insulated core wire 16 runs smoothly along the inner surface of the camp A.

Although the lead-in wire a in the above embodiment is a C■ cable, it goes without saying that a cross-linked polyethylene insulated vinyl sheathed cable, a polyethylene insulated vinyl sheathed cable, a cable with a supporting wire, etc. can be used as appropriate.

In addition, in the above embodiment, conductor connections are made using crimp terminals, bolts, and nuts, but compression sleeves,
This can be done by using a crimp sleeve or the like.

Furthermore, for the insulation treatment of the connection part, a better connection part can be obtained by using a heat shrink tube having an adhesive layer inside instead of the tape wrapping process.

Further, if a heat shrink tube having an adhesive layer is also applied between the C■ cable sheath and the sheath fitting portion 1 of the end cap A, an even better connection can be obtained.

〔Effect of the invention〕

As can be understood from the above explanation, the terminal connection method according to the present invention can easily uniformize the terminal branching process of the low-voltage drop-in line, and can provide good weather resistance and aging resistance. , connection work time can also be shortened.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of an embodiment of the terminal connection method according to the present invention, FIGS. 2 and 3 are perspective views for explaining the connection method, and FIG. 4 is a perspective view of the terminal cap shown in FIG. 1. be. A...Terminal cap, a...Publication 1 included line (
CV cable), b... Cable, 1...
... Fitted part, 2... Expanded diameter part, 3...
・Branch pipe, 11... High voltage overhead insulation - 8 = Electric wire, 12... High voltage transformer, 13...
・Low voltage transformer, 15...Sheath, 16...
... Insulated core wire, 17 ... Jute interposition, 18
...Insulation (insulating layer), 19...Conductor,
20...Crimp terminal.

Claims (3)

[Claims] (1) Stripping off the outer sheath of the cable terminal, removing the intervention between the insulated core wires, untwisting the twisted insulated core wires and branching them, and stripping off the terminal insulation of the insulated core wires to expose the conductor. After that, the cable terminal includes a portion that fits into the sheath end of the cable, and an enlarged diameter portion that continuously extends from the fitted portion.
A branch pipe extending from around the obstructed front surface of the enlarged diameter portion,
The fitting part is fitted to the end of the outer sheath, and the insulated core wire is inserted into the branch pipe through the enlarged diameter part, and the exposed conductor protruding from the branch pipe and the indoor wiring cable are 1. A method for connecting an end of a low-voltage drop-in line, the method comprising: connecting an insulated conductor to an insulated conductor; and insulating the connecting portion. (2) A method for connecting an end of a low-voltage drop-in line according to claim (1), characterized in that the connecting portion of the conductor is insulated with a heat-shrinkable tube having an adhesive layer inside. (3) Claim (1) or (2) is characterized in that a weather-resistant heat-shrinkable pipe having an adhesive layer is placed between the sheath end and the sheath-fitting portion of the end cap. How to connect the terminal of a low voltage service line.