JP2005333224A - Indoor power wiring, joint box for use therein, wiring adapter, switch member, table tap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide indoor power wiring capable of power line communication in which degradation in communication quality is suppressed by suppressing generation of common mode noise. <P>SOLUTION: In the indoor power wiring, a common mode choke is connected in the way of a power line. The common mode choke is set such that a common mode impedance has a sufficiently large value in carrier frequency band of power line communication utilizing that indoor power wiring. The common mode choke is provided at a branch for connecting a line on the power supply side with a plurality of lines being supplied with power, i.e. a joint box 91, 92, an outlet 2a, 3a, 3b, 3c, 3d, or the like. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an indoor power wiring used for power line carrier communication, a joint box used for indoor power wiring, a wiring adapter, a switch member, and a table tap.

  Power line carrier communication performs communication using a power line that supplies commercial power as a transmission line, and is usually performed by balanced transmission using two lines. In indoor power line communication, a communication device is connected via a modem to a power supply outlet to which two or three power wires are connected, and transmission / reception is performed between the communication devices connected to the outlet.

  In power line carrier communication, since the balance of the transmission path is not always sufficient, it is necessary to consider the occurrence of common mode noise. In other words, the power wiring that is wired indoors does not necessarily have a high degree of balance of the wiring itself, and the balance of the various electrical devices connected to the power wiring is reduced, so that the common mode noise is reduced. Will occur.

  Patent Document 1 discloses a technique using a common mode choke for reducing common mode noise in power line carrier communication. The inductor loading device for power line carrier communication described in Patent Literature 1 is inserted into each line connecting between the power line and the power supply end of the electric device, and the inductor is inserted in series with the line. In addition, a common mode choke coil for power supply that attenuates an unbalanced component in a specific frequency band is inserted between the lines.

  However, the inductor loading device for power line carrier communication described in Patent Document 1 is used by being inserted into a power supply outlet and is not convenient. Further, it is not possible to attenuate the unbalanced component of the transmission path caused by the electrical equipment directly connected to the power wiring.

JP 2003-283390 A

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an indoor power wiring that can perform power line carrier communication with less deterioration of communication quality and less occurrence of common mode noise.

  The indoor power wiring used for the power line carrier communication of the present invention has a common mode choke connected in the middle of the power wiring line. According to the present invention, by incorporating the common mode choke in the middle of the wiring, it is possible to increase the balance of the indoor wiring and suppress the generation of the common mode current, and to reduce the deterioration of the power line carrier communication.

  The indoor power wiring of the present invention includes a branch part that connects a power supply side line and a plurality of power supplied side lines, and the common mode choke is connected to each of the power supply side line and the power supplied side line of the branch part. Including those connected between.

  In the indoor power wiring of the present invention, the branch portion is connected to the power supply side line, the power supply side terminal connected to the power supply side line, the power supply side terminal, and the power supply side. Including a joint box having the common mode choke connected to a terminal. Thus, by incorporating the common mode yoke between the power supply side terminal of the joint box and the power supply side terminal to be branched, it is possible to provide indoor wiring with a good balance just by performing the first power supply work. it can.

  The indoor power wiring of the present invention includes one in which the common mode choke is provided in a power outlet and connected between a power feeding side terminal to which a power feeding side line of the power outlet is connected and a jack conductor of the outlet. .

  The indoor power wiring of the present invention includes a wiring adapter connected to a power supply side terminal of a power outlet, and the wiring adapter is connected to a power supply side terminal connected to a power supply side line and the power supply side terminal of the power outlet. The common mode choke includes one connected between the power supply side terminal and the outlet connection terminal. ADVANTAGE OF THE INVENTION According to this invention, the indoor wiring which can reduce a common mode noise is realizable by connecting a wiring adapter to the outlet for indoor wiring already wired.

  The indoor power wiring of the present invention has a switch member connected in two lines between the power supply side line and the power supply side line, and the common mode choke is between the power supply side terminal and the power supply side terminal of the switch member. The switch element of the switch member includes one provided between the common mode choke and the power-supplied terminal.

  The indoor power wiring of the present invention includes a table tap connected to a power outlet, and the common mode choke includes one connected between a power jack of the table tap and a power cord.

  The indoor power wiring of the present invention includes the common mode choke having a sufficiently large common mode impedance value in a carrier frequency band of power line carrier communication.

  The joint box of the present invention branches indoor power wiring, and includes a power supply side terminal connected to a power supply side line, a power supply side terminal connected to a power supply side line, the power supply side terminal, and the power supply side terminal. It has a common mode choke for connecting a power-supplied terminal.

  The joint box of the present invention includes a joint box in which the common mode choke has a sufficiently large common mode impedance value in a carrier frequency band of power line carrier communication using the indoor wiring.

  The wiring adapter according to the present invention is a wiring adapter connected to a power supply side terminal of a power outlet of an indoor power wiring, and is connected to a power supply side terminal connected to a power supply side line and the power supply side terminal of the power outlet. An outlet connecting terminal, and a common mode choke connected between the power supply side terminal and the outlet connecting terminal.

  The wiring adapter of the present invention includes the common mode choke having a sufficiently large common mode impedance value in a carrier frequency band of power line carrier communication using the indoor wiring.

  The switch member of the present invention is connected in two lines to the indoor power wiring, and includes a power supply side terminal connected to the power supply side line, a power supply side terminal connected to the power supply side line, and the power supply side. A common mode choke connected between the terminal and the power-supplied terminal, and a switch element provided between the common mode choke and the power-supplied terminal.

  The switch member of the present invention includes a member in which the common mode choke has a sufficiently large common mode impedance value in a carrier frequency band of power line carrier communication using the indoor wiring.

  The table tap of the present invention comprises a power plug inserted into a power outlet of an indoor power wiring, a tap portion having a plurality of sets of power jacks, and a power cord connecting the power plug and the tap portion, The tap portion has a common mode choke connected between the power supply side conductor to which the power cord is connected and the power jack.

  The table tap of the present invention includes one in which the common mode choke has a sufficiently large common mode impedance value in a carrier frequency band of power line carrier communication using the indoor wiring.

  As is apparent from the above description, according to the present invention, it is possible to provide an indoor power wiring capable of power line carrier communication with little deterioration in communication quality and little common mode noise.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration of a main part of a single-phase three-wire indoor power wiring for explaining an embodiment of the present invention.

  The single-phase three-wire power wiring includes a first voltage line L1, a second voltage line L2, and a neutral line N, and is wired indoors through the main circuit breaker 1. An AC voltage of 100 V is supplied between the first voltage line L1 and the neutral line N, and between the second voltage line and the neutral line N, and the phase of each AC voltage is inverted. An AC voltage of 200V is applied between the line L1 and the second voltage line L2. When supplying 100V electric power to indoor electrical equipment, the first voltage line L1 and the neutral line N, or the second voltage line and the neutral line N, are installed at various locations in the room. This is done through an outlet or by direct connection. Moreover, when providing 200V high voltage electric power, it carries out by two lines, the 1st voltage line L1 and the 2nd voltage line L2. In addition, when providing 200V electric power, it is common to connect also a neutral wire for installation.

  In FIG. 1, a 100V outlet (hereinafter simply referred to as “100V outlet”) 2a is connected to the first voltage line L1 and the neutral line N, and the second voltage line. Outlets 3a, 3b, 3c, and 3d are connected to L2 and the neutral wire N. And 100V alternating voltage is supplied to the 100V electric equipments 52 and 53 from the outlets 3b and 3d, respectively. Communication devices 8a, 8b, and 8c are connected to the outlets 2a, 3a, and 3c via modems 7a, 7b, and 7c, respectively, and power line carrier communication is possible. In FIG. 1, the modems 7a, 7b, and 7c and the communication devices 8a, 8b, and 8c are illustrated as separate elements. However, the communication devices 8a, 8b, and 8c incorporate the modems 7a, 7b, and 7c, respectively. It may be. In addition, power supply to the communication devices 8a, 8b, and 8c is performed from the outlets 2a, 3a, and 3c or other outlets, although not shown.

  Electric devices such as lighting devices are often supplied with power without going through an outlet, and the first voltage line L1 and the neutral line N or the second voltage line L2 and the neutral line N are directly connected. In FIG. 5, the 100 V electric device 51 is directly connected to the electric device 54 via the switch unit 541.

  Three lines of the first voltage line L1, the second voltage line L2, and the neutral line N are connected to the 200V outlets 4a and 4b for supplying power to the 200V electric device. In FIG. 5, power is supplied to the 200V electric appliance 6 from the 200V outlet 4a.

  Since many indoor power wirings are connected to outlets and electrical equipment, joint boxes 91 and 92 are provided at various points in the track. The joint boxes 91 and 92 branch the power wiring, and connect a power supply line and a plurality of power supply lines. In the following description, the power feeding side means a side close to the circuit breaker 1 and distribution board (not shown) connected to the outdoor wiring, and the power supplied side is the circuit breaker 1 and distribution board (see FIG. (Not shown) means a side far from an electric device to which power is supplied or a communication device performing power line communication.

  In FIG. 1, the joint box 91 branches the power supply side line 91 a on the main circuit breaker 1 side into a line 91 b connected to the outlet 3 a and a line 91 c connected to the joint box 92. Further, the joint box 92 branches the power supply side line 91c on the joint box 91 side into a line 92a connected to the 100V electric device 54, a line 92b connected to the 100V electric device 51, and a line 92c connected to the outlet 3b. .

  Communication between the communication devices 8a, 8b, and 8c is performed using two power lines, for example, by the OFDM method. As is clear from FIG. 1, the communication devices 8b and 8c are directly connected by the second voltage line L2 and the neutral line N, but the communication device 8a is connected to the first voltage line L2 and the neutral line N. The communication devices 8b and 8c and the communication device 8a are not directly connected. In order to reduce the influence of not being directly connected, the adapter device 10 is connected to the 200V outlet 4b. The adapter device 10 will be described later.

  In the indoor power wiring of FIG. 1, a common mode choke is connected in the middle of the power wiring line. The connected common mode choke is set so that the common mode impedance value in the carrier frequency band of the power line carrier communication using the indoor power wiring is sufficiently large. The carrier frequency band of the power line carrier communication used here is, for example, 2 MHz to 30 MHz, and the impedance value is, for example, 1 kΩ or more. When such a common mode choke is inserted, the common mode current generated in the transmission line can be consumed as heat, and the generation of high frequency noise can be suppressed.

  In addition, the impedance value in the differential mode in the carrier frequency band of the common mode choke is set to a sufficiently small value, for example, several tens of Ω or less.

  The common mode choke described above can be provided in the joint boxes 91 and 92 in the branch portion that connects the power supply side line and the plurality of power supply side lines, in the indoor wiring of FIG.

  FIG. 2 shows a schematic configuration of an example of a joint box provided with a common mode choke. The joint box of FIG. 2 includes power supply side terminals 902a and 902b, power supplied side terminals 903a and 903b, and a common mode choke 910, which are housed in a case 901 schematically shown. The power supply side terminals 902a and 902b are connected to the power supply side line 920, and the power supplied side terminals 903a and 903b are connected to the power supplied side lines 931 and 932. The common mode choke 910 is connected between the power supply side terminals 902a and 902b and the power supply side terminals 903a and 903b. In the example of FIG. 2, the power-supplied terminals 903a and 903b are connected to two sets of power-supplied lines, but three or more sets may be used.

  FIG. 3 shows a schematic configuration of another example of the joint box provided with the common mode choke. The joint box in FIG. 3 is the same as the joint box in FIG. 2 except that the common mode choke and the power-supplied terminal are provided corresponding to the number of branches. The joint box in FIG. 3 is provided with power-supplied terminals 904 a and 904 b connected to the power-supplied line 931 and power-supplied terminals 905 a and 905 b connected to the power-supplied line 932. A common mode choke 911 is connected between the power supply side terminals 902a and 902b and the power supplied side terminals 904a and 904b, and the common mode choke 912 is connected between the power supply side terminals 902a and 902b and the power supplied side terminals 905a and 905b. Is connected. Thus, by providing the common mode choke for each branch line, it is possible to suppress the common mode noise of one branch path from being transmitted to the other branch path.

  The common mode choke can also be provided at the power outlet. FIG. 4 shows a schematic configuration of an example of a power outlet provided with a common mode choke. The power outlet of FIG. 4 includes power supply side terminals 302a and 302b, power jacks 303a, 303b, 304a and 304b, and a common mode choke 310, which are housed in a case 301 schematically shown. The power supply side terminals 302a and 302b are connected to power supply side lines (not shown) inserted through the power cable holes 305a and 305b. The common mode choke 310 is connected between the power supply side terminals 302a and 302b and the power jacks 303a, 303b, 304a, and 304b.

  FIG. 5 shows a schematic configuration of another example of a power outlet provided with a common mode choke. The power outlet in FIG. 5 is the same as the power outlet in FIG. 4 except that connection to the power-supplied side line is possible. The power outlet of FIG. 5 includes power jacks 306a and 306b to which a power cable (not shown) serving as a power supply side line can be connected. The common mode choke 310 is connected between the power supply side terminals 302a and 302b and the power supply jacks 306a and 306b. The power cable serving as the power-supplied side line is inserted through the power cable holes 305a and 305b. The power outlet shown in FIG. 5 is used as, for example, the power outlet 3c in FIG.

  The common mode choke can also be provided in a wiring adapter connected to the power supply side terminal of the power outlet. FIG. 6 shows a schematic configuration of an example of a wiring adapter provided with a common mode choke. The wiring adapter shown in FIG. 6 includes power supply side terminals 322a and 322b, power supplied side terminals 323a and 323b, outlet connection members 324a and 324b, and a common mode choke 320. Stored. The power supply side terminals 322a and 322b are connected to power supply side lines (not shown) inserted through the power cable holes 325a and 325b. The common mode choke 320 is connected between the power supply side terminals 322a and 322b and the power supply side terminals 323a and 323b. Outlet connection members 324a and 324b are connected to power-supplied terminals 323a and 323b, and are connected to power-supply terminals of the power outlet.

  Therefore, the wiring adapter shown in FIG. 6 is provided between the power supply side line and the power outlet, and the common mode choke can be connected to the power supply side line of the power outlet without replacing the power outlet. Since the power outlet for indoor wiring is usually structured so that it can be easily connected by stripping the cable sheath and inserting a copper wire into the hole in the outlet, the wiring adapter shown in FIG. By adopting such a shape that the outlet connecting members 324a and 324b can be inserted into the holes of the outlet, the wiring adapter can be easily added.

  The common mode choke can also be provided in a switch member that is connected in two lines between the power supply side line and the power supply side line. As shown in FIG. 7, the two-wire connected switch member is provided in the middle of a power feed line for 100 V electrical equipment such as lighting equipment. FIG. 7 shows an extracted line between the joint box 92 of the indoor power wiring shown in FIG. 1 and the 100V electric appliance 54.

  FIG. 8 shows a schematic configuration of an example of a switch member provided with a common mode choke. The switch member of FIG. 8 includes power supply side terminals 5422a and 5422b, power supplied side terminals 5423a and 5423b, a common mode choke 5420, and a switch element 5430, which are housed in a housing 5421 schematically shown. . The power supply side terminals 5422a and 5422b are connected to power supply side lines (not shown) inserted through the power cable holes 5424a and 5424b, and the power supplied side terminals 5423a and 5423b are connected to the power cable holes 5425a and 5425b. It is connected to a power-supplied side line (not shown) inserted through the cable. The common mode choke 5420 is connected between the power supply side terminals 5422a and 5422b and the power supplied side terminals 5423a and 5423b. The switch element 5430 is connected between the common mode choke 5420 and the power-supplied terminal 5423b. When the switch element has two contacts, the switch element is connected between the common mode choke 5420 and the power-supplied terminals 5423a and 5423b.

  When a switch element is inserted into one wiring, one line becomes longer and the balance of the line is lowered. However, when the switch member shown in FIG. 8 is used, the deterioration of the balance due to the presence of the switch element is reduced. Can do. Also, common mode noise can be reduced by the common mode choke.

  The common mode choke can also be provided on a table tap used as a part of the power wiring. FIG. 9 shows a schematic configuration of an example of a table tap provided with a common mode choke. 9 includes a power plug 16, a power cord 17, and a tap housing 18 that are inserted into a power jack (not shown) of a power outlet.

  The power plug 16 has power plug terminals 161a and 161b, and is inserted into a power jack (not shown) of a power outlet.

  In the tap housing 18 schematically shown, power supply side terminals 181a and 181b, power jacks 182a, 182b, 183a and 183b, and a common mode choke 180 are housed. The power supply side terminals 181a and 181b are connected to the power plug terminals 161a and 161b via the power cord 17. The common mode choke 180 is connected between the power supply side terminals 181a and 181b and the power jacks 182a, 182b, 183a and 183b.

  Next, the adapter device 10 inserted into the 200V outlet 4a will be described. FIG. 10 shows a schematic configuration of an example of the adapter device 10. The adapter device 10 shown in FIG. 10 is used by connecting to a 200V outlet, and includes a power plug terminal 111, 112, 11N, a capacitor 12, and power jacks 131, 132, 13N. It is stored in.

  The power plug terminals 111 and 112 are inserted into a power jack (not shown) of a 200V outlet and connected to the first voltage line L1 or the second voltage line L2. Similarly, the power plug terminal 11N is inserted into a power jack (not shown) of a 200V outlet and connected to the neutral wire N. The capacitor 12 is an impedance element connected between the power plug terminals 111 and 112, and the absolute value of the impedance is set to a value that can be substantially ignored in the carrier frequency band of the power line carrier communication. Here, the value that can be substantially ignored in the carrier frequency band of the power line carrier communication is the power line carrier communication from the first voltage line L1 to the second voltage line L2 or from the second voltage line L2 to the first voltage line L1. This means that the absolute value of the impedance at the carrier frequency of the power line carrier communication is a value that can be substantially ignored so that the above signal is transmitted without being greatly attenuated. As a result, the capacitor 12 functions as a bypass element between the first voltage line L1 and the second voltage line L2. Here, the carrier frequency band of the power line carrier communication used is 2 MHz to 30 MHz, and the absolute value of the impedance in that band is, for example, 10Ω.

  The power jacks 131, 132, and 13N are connected to the power plug terminals 111, 112, and 11N, respectively, and other power plugs can be inserted. Therefore, even if the adapter device 10 of FIG. 1 is inserted into a 200 V outlet, a 200 V AC power supply can be supplied from the outlet to other electrical devices. In addition, when it is not necessary to supply power from the outlet into which the adapter device 10 is inserted, the power jacks 131, 132, and 13N are unnecessary. Further, the power plug terminal 11N and the power plug terminal 11N can be omitted.

  INDUSTRIAL APPLICABILITY The present invention is useful as an indoor power wiring used for power line carrier communication, a joint box, a wiring adapter, a switch member, a table tap, and the like used for such indoor power wiring.

The figure which shows the principal part schematic structure of the single phase three-wire type indoor power wiring for demonstrating embodiment of this invention The figure which shows schematic structure of an example of the joint box provided in the indoor electric power wiring of embodiment of this invention. The figure which shows schematic structure of the other example of the joint box provided in the indoor electric power wiring of embodiment of this invention. The figure which shows schematic structure of an example of the power outlet provided in the indoor electric power wiring of embodiment of this invention The figure which shows schematic structure of the other example of the power outlet provided in the indoor power wiring of embodiment of this invention The figure which shows schematic structure of an example of the wiring adapter provided in the indoor electric power wiring of embodiment of this invention The figure which shows the partial structure of the indoor power wiring for demonstrating embodiment of this invention The figure which shows schematic structure of an example of the switch member provided in the indoor electric power wiring of embodiment of this invention. The figure which shows schematic structure of an example of the table tap utilized as indoor electric power wiring of embodiment of this invention The figure which shows schematic structure of an example of the adapter apparatus utilized for the indoor electric power wiring of embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Main circuit breaker 2a, 3a, 3b, 3c, 3d ... Outlet for 100V 4a, 4b ... Outlet for 200V 51, 52, 53, 54 ... 100V electrical equipment 6 ... 200V electricity Equipment 7a, 7b, 7c ... Modem 8a, 8b, 8c ... Communication equipment 91, 92 ... Joint box 91a-91c, 92a-92c ... Line 10 ... Adapter device 541, 542 ... Switch unit 301 ... Power outlet housing 302a, 302b ... Power outlet terminal 303a, 303b, 304a, 304b, 306a, 306b ... Power outlet power jack 305a, 305b, 325a, 325b, 5424a, 5424b, 5425a, 5425b... Power cable hole 310, 320.. Common mode choke 321 ... Wiring adapter housing 322a, 322b ... Power supply side terminal of wiring adapter 323a, 323b ... Power supply side terminal of wiring adapter 324a, 324b ... Outlet connection member of wiring adapter 901 ..Joint box housings 902a, 902b: Joint box power supply side terminals 903a, 903b, 904a, 904b, 905a, 905b ... Joint box power supplied side terminals 910, 911, 912 ... Common mode chokes 920... Power supply side lines to the joint box 931, 932... Power supplied side lines from the joint box 5421... Switch member housing 5422 a, 5422 b... Switch member power supply side terminals 5423 a, 5423 b. switch Power-supplied terminal 5420 ... Common mode choke 5430 ... Switch element 16 ... Power plug 161a, 161b ... Power plug terminal 17 ... Power cord 18 ... Tap housing 181a, 181b ... Power supply side terminals 182a, 182b, 183a, 183b ... Power jack 180 ... Common mode choke 100 ... Adapter casing 111, 112, 11N ... Power plug terminal 12 ... Capacitor 131, 132, 13N: Power jack

Claims (16)

Indoor power wiring used for power line carrier communication,
An indoor power wiring having a common mode choke connected in the middle of the power wiring line. The indoor power wiring according to claim 1,
A branching portion for connecting the power supply side line and the plurality of power supplied side lines is provided,
The common mode choke is an indoor power wiring connected between the power supply side line and the power supplied side line of the branch portion. The indoor power wiring according to claim 2,
The branch portion is connected between a power supply side terminal connected to the power supply side line, a power supply side terminal connected to the power supply side line, and the power supply side terminal and the power supply side terminal. Indoor power wiring constituted by a joint box having the common mode choke. The indoor power wiring according to any one of claims 1 to 3,
The common mode choke is provided in a power outlet, and is an indoor power wiring connected between a power feeding side terminal to which a power feeding side line of the power outlet is connected and a jack conductor of the outlet. The indoor power wiring according to any one of claims 1 to 3,
With a wiring adapter connected to the power supply terminal of the power outlet,
The wiring adapter has a power supply side terminal connected to the power supply side line, and an outlet connection terminal connected to the power supply side terminal of the power outlet,
The common mode choke is an indoor power wiring connected between the power supply side terminal and the outlet connection terminal. The indoor power wiring according to any one of claims 1 to 5,
Having a switch member connected in two lines between the power supply side line and the power supply side line,
The common mode choke is connected between a power supply side terminal and a power supply side terminal of the switch member,
The switch element of the switch member is an indoor power wiring provided between the common mode choke and the powered terminal. The indoor power wiring according to any one of claims 1 to 6,
Has a table tap connected to the power outlet,
The common mode choke is an indoor power wiring connected between a power jack of the table tap and a power cord. The indoor power wiring according to any one of claims 1 to 7,
The common mode choke is an indoor power wiring having a sufficiently large common mode impedance value in a carrier frequency band of power line carrier communication. A joint box for branching indoor power wiring,
A power supply side terminal connected to the power supply side line;
A fed-side terminal connected to the fed-side line;
A joint box having a common mode choke for connecting the power supply side terminal and the power supplied side terminal. The joint box according to claim 9,
The common mode choke is a joint box having a sufficiently large common mode impedance value in a carrier frequency band of power line carrier communication using the indoor wiring. A wiring adapter connected to the power supply side terminal of the power outlet of the indoor power wiring,
A power supply side terminal connected to the power supply side line;
An outlet connection terminal connected to the power supply side terminal of the power outlet;
A wiring adapter having a common mode choke connected between the power supply side terminal and the outlet connection terminal. The wiring adapter according to claim 11,
The common mode choke is a wiring adapter having a sufficiently large common mode impedance value in a carrier frequency band of power line carrier communication using the indoor wiring. A switch member connected to the indoor power wiring in two lines,
A power supply side terminal connected to the power supply side line;
A fed-side terminal connected to the fed-side line;
A common mode choke connected between the power supply side terminal and the power supplied side terminal;
A switch member having a switch element provided between the common mode choke and the power-supplied terminal. The switch member according to claim 13,
The common mode choke is a switch member having a sufficiently large common mode impedance value in a carrier frequency band of power line carrier communication using the indoor wiring. A power plug inserted into the power outlet of the indoor power wiring,
A tap portion having a plurality of sets of power jacks;
A power cord for connecting the power plug and the tap portion;
The tap section is a table tap having a common mode choke connected between a power supply side conductor to which the power cord is connected and the power jack. The switch member according to claim 15,
The common mode choke is a table tap having a sufficiently large common mode impedance value in a carrier frequency band of power line carrier communication using the indoor wiring.

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