JPS6037768Y2 - cable line - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cable line of a low-voltage trunk line, and relates to a cable line provided with prefabricated branch lines for each customer.

BACKGROUND ART Conventionally, low-voltage main lines in high-rise apartment buildings and the like are provided with single-phase three-wire cable lines that are lowered through single-phase transformers.

FIG. 1 is a connection diagram between a high-voltage main line and a low-voltage main line.

The high-voltage trunk line 1 and the low-voltage trunk line 2 are connected via a single-phase transformer 2, and the voltage of the low-voltage trunk line 2 is lowered to 200 V AC.

In addition, the neutral wire 5 is connected to the center of the secondary coil of the single-phase transformer 2, and the voltage wires 4 and 6 are connected to both ends, so that between the neutral wire 5 and the voltage wire 4 or AC 100V is obtained between the neutral wire 5 and the voltage wire 6.

FIG. 2 is a line diagram showing a branching state of the low-voltage main line, and the same parts as in FIG. 1 are given the same reference numerals.

Since 200V power can be obtained between the lines branched from the voltage lines 4 and 6, it is connected to this when heating a water heater or the like with cheap late-night power, for example.

Moreover, between the neutral wire 5 and the voltage line 4 or the voltage line 6, 10
Since 0V power can be obtained, it is connected to general power lines, electric heaters, refrigerators, etc., and such a branch section is provided for each customer.

Since the conventional cable used for the low-voltage trunk line 3 is a stranded wire type in which all three cores have the same conductor cross-sectional area, the branch portions of the voltage wires 4, 6 and the neutral wire 5 tend to have large outer diameters. .

To improve this point, the cable of the low-voltage main line 3 may be made thinner by using a thin conductor for the neutral wire 5, which is not practically related to the 200V load, and the prefabricated branch portion may be formed into a smaller size. It is being done.

However, since such branch parts are insulated with vinyl molding, it is necessary to replace the molding die for branching 3-wire twisted cables of different cable sizes, the cable connection base, etc. depending on the branch point. However, there was also the drawback that prefabricated branching work was extremely inefficient.

The purpose of this invention is to provide a cable line that facilitates the prefabricated branching work of three insulated wire cores used for low-voltage main lines and can be manufactured efficiently. Two prefabricated branch lines are installed in each position close to each other, the voltage lines are twisted together, a wire core with a small conductor cross section is used for the twisted voltage lines, and one prefabricated branch line is installed in a position close to the branch part of the voltage line. A neutral line with a prefabricated branch line is attached vertically, and the neutral line and the voltage line are intermittently tied together.

FIG. 3 is a perspective view of a cable of a low-voltage trunk line according to an embodiment of the present invention, and FIG. 4 is a sectional view of the cable line of FIG. 3.

The voltage wires 4 and 6 are twisted wires, and a thin neutral wire 5 is attached vertically to the wires and bound together with tape 11 at an appropriate interval.

Two branch lines 7 are taken out from the branch part 10 of the voltage lines 4 and 6, and one branch line 7 is taken out from the branch part 10 of the neutral line 5.

FIG. 5 is a sectional view of the branch portion 10 of the voltage line 4.

A part of the insulation material of the voltage line 4 is removed and a branch line 7 is attached to the conductor.
The conductors are firmly fixed by a connector 8 in close contact with each other.

For this connecting portion, a vinyl mold portion 9 is formed using a metal mold, and a branch portion 10 is configured.

After such branch parts 10 are formed on other voltage lines 6 and neutral wires 5 at predetermined intervals, the wire stranding work is performed so that the branch parts 10 of voltage lines 4 and 6 are close to each other. .

Further, if the branch part 10 of the neutral wire 5 is brought close to the branch part 10 of the voltage line and the wires are tied together with the vertical splicing tape 11 at appropriate intervals, the state shown in FIG. 3 will be obtained.

This prefabricated cable line is installed in a high-rise apartment building, and each branch line 7 is connected to each customer's wiring.

The cable line prefabricated in this way is relatively thin and can be drum-wound.

In other words, since the power lines 4 and 6 are twisted together, there is no problem in drum winding, and if the vertically attached center line 5 is left with some slack between the bundles, even if some twisting occurs during winding, the voltage line will be fine. Since it is thinner than 4 and 6, it can be used adequately.

This branch line is located 100 minutes from a location close to the low-voltage main line 3.
Since it is possible to obtain a power source of 200 V and only need to provide such a branch point for each customer, the number of branch points is reduced and manufacturing can be done at low cost.

In addition, when producing prefabricated products, voltage wire 4,
Since it is only necessary to use a mold for the wire 6 and a mold for the neutral wire 5, the efficiency of branching work is significantly improved.

Furthermore, two types of connectors 8 may be used.

In the cable line of this example, a mold is prepared for each cable production line and the branch part is vinyl molded, so prefabricated branching work is easy. Since the wires can be attached vertically and bundled with each branch part close to each other, the cable line can be manufactured efficiently.

In the above embodiment, the low-voltage trunk line is bound with tape 11, but a string may be used instead of the tape.

Further, an adhesive tape or the like may be wound in a helical manner.

The cable line of the present invention has the effect that a branch line that can be easily prefabricated can be branched from a low-voltage main line.

[Brief explanation of the drawing]

Fig. 1 is a connection diagram of a high-voltage main line and a low-voltage main line, Fig. 2 is a line diagram showing a branching state of the low-voltage main line, and Fig. 3 is a perspective view of a low-voltage main line that is an embodiment of the present invention. 4 is a sectional view of the cable line of FIG. 3, and FIG. 5 is a sectional view of a branch portion of the voltage line of FIG. 3. 3...Low voltage main line, 4,6...Voltage line, 5...Neutral line, 7...Branch line,
...Connector, 9...Vinyl mold part,
10.10'... Branch, 11... Tape.

Claims (1)

[Scope of utility model registration request] A branch line is installed in each of the pair of voltage lines and one neutral line of the low-voltage main line, in which the voltage of the high-voltage main line is dropped via a single-phase transformer, and 100V and 200V AC power is supplied from the branch line. In a cable line configured to supply
(Two wires each placed close to the above pair of voltage wires)
A prefabricated branch line is provided, the pair of voltage lines are twisted together, a wire core with a small conductor cross section is used for the twisted voltage line, and one prefabricated branch line is provided at a position close to the branch of the voltage line. A cable line characterized in that a neutral wire is provided vertically, and the neutral wire and the voltage line are intermittently tied together.