WO2005112293A1

WO2005112293A1 - Indoor electric power wiring and joint box, wiring adapter, switch member, and table tap utilized for indoor electric power wiring

Info

Publication number: WO2005112293A1
Application number: PCT/JP2005/009309
Authority: WO
Inventors: Tsunehiro Hanada; Mutsuhiko Oishi; Fumio Ichihara; Akihiro Yamashita; Masahiro Maki; Toshiyuki Wakisaka
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2004-05-18
Filing date: 2005-05-17
Publication date: 2005-11-24

Abstract

In indoor electric power wiring, a common mode choke is connected to midstream of an electric power wiring line. A common mode choke, which is connected, is set up in such a manner that a common mode impedance value in a carrier frequency band of electric power line carrier communication which utilizes this indoor electric power wiring becomes a sufficiently large value. The common mode choke is disposed in joint boxes 91, 92, outlets 2a, 3a, 3b, 3c, 3d, and so on, which are branch sections for connecting a power supplying side line and a plurality of power supplied side lines.

Description

DESCRIPTION

INDOOR ELECTRIC POWER WIRING AND JOINT BOX, WIRING ADAPTER, SWITCH MEMBER, AND TABLE TAP UTILIZED FOR INDOOR ELECTRIC POWER WIRING

Technical Field This invention relates to indoor electric power wiring which is utilized for electric power line carrier communication, a joint box which is utilized for indoor electric power wiring, a wiring adapter, a switch member, and a table tap.

Background Art Electric power line carrier communication is one which carries out communication by using an electric power line which supplies commercial electric power, as a transmission line, and normally, it is carried out by balanced transmission which utilized two lines. In indoor electric power line communication, a communication device is connected through a modem to an outlet (receptacle) for supplying electric power, to which two or three electric power wiring lines are connected, and transmission and reception are carried out between communication devices which were connected to outlets. In electric power line carrier communication, balance of a transmission line is not necessary sufficient, and therefore, there is need to consider occurrence of common mode noises. That is, as to electric power wiring which is wired indoors, common node noises are generated even if balance is lowered, for the reason that balance of wiring itself is not necessarily high and also, balance of various electric devices which are connected to electric power wiring is bad, and so on. For the purpose of reduction of common mode noises in electric power line carrier communication, a technology utilizing a common mode choke is described in JP-A-2003-283390. An inductor loader for electric power line carrier communication, which is described in JP-A-2003-283390, is one which is inserted into each line connected between an electric power line and a power supplying end of an electric device, and is one in which an inductor is inserted in series with a line and a power common mode choke coil, which attenuates an unbalanced component in a specific frequency band, is inserted between lines. However, the inductor loader for electric power line carrier communication, which was described in JP-A-2003-283390, is one which is used to be inserted into a electric power supply outlet, and usability is not good. In addition, it is not possible to attenuate an unbalanced component of a transmission line which is brought about by an electric device which is connected in series with electric power wiring. In case that indoor electric power supply is carried out by use of a single-phase three-line system, a neutral line and one voltage line are connected to 100V electric devices and outlets, and both voltage lines are connected to 200V electric devices and outlets. There is also such a case that a neutral line is also connected to 200V electric devices and outlets, as a grounding line. Since 100 V electric power supply is carried out by one of two voltage lines (in case of sorting out them, described as "first voltage line", "second voltage line") and the neutral line, electric devices and outlets (described as "first outlet") to which the first voltage line is connected and electric devices and outlets (described as "second outlet") to which the second voltage line is connected are to be mixed. On that account, on the occasion of carrying out electric power line carrier communication in doors where single-phase three-line type electric power supply is carried out, there is such a case that communication quality is lowered. The reason thereof is that, in case of carrying out electric power line carrier communication between a communication device which was connected to the first voltage line and a communication device which was connected to the second voltage line, one line of a balanced transmission line is the neutral line, whereas the other line is the first voltage line and the second voltage line and they are not directly conductive-connected, and signal transmission is carried out by capacitance coupling between lines, and therefore, attenuation of signals is unavoidable. Since there is need to consider this attenuation of transmission signals due to capacitance coupling between lines, a large output modem becomes necessary. As a technology for improving a characteristic of a transmission line of indoor wiring in electric power line carrier communication, there are ones which were described JP-A-2003-283390 or JP-A-2003-218754. However, the technologies, which were described in these documents, do not refer to characteristic deterioration due to electric power supply in a single-phase three-line system, at all.

Disclosure of Invention The invention is one which was made in view of the above-described circumstances, and aims to provide indoor electric power wiring which is capable of electric power line carrier communication with less deterioration of communication quality and less common mode noise occurrence. Indoor electric power wiring of the invention, which is utilized for electric power line carrier communication, is one having a common mode choke which is connected to midstream of an electric power wiring line. According to the invention, the common mode choke is incorporated in wiring midstream, and thereby, it is possible to suppress occurrence of common mode currents by raising balance of indoor wiring, and it is possible to reduce deterioration of electric power line carrier communication. Further, a power line carrier communication adapter device of the invention is one which is utilized for electric power line carrier communication utilizing single-phase three-line type indoor electric power wiring and is inserted into a high voltage outlet to which a first voltage line and a second voltage line of the electric power wiring are connected, and one which has a first conductor which is connected to one of the first voltage line and the second voltage line, a second conductor which is connected to the other of the first voltage line and the second voltage line, and an impedance element which was connected between the first conductor and the second conductor. According to the invention, it is possible to strengthen coupling between the first voltage line and the second voltage line by the impedance element, and it is possible to improve an attenuation characteristic of a transmission line. Therefore, on the occasion of carrying out electric power line carrier communication utilizing single-phase three-line type indoor electric power wiring, it is possible to lessen a transmission output of a modem, and it is possible to realize high quality communication with less impact to other devices, by a simple configuration.

Brief Description of Drawings Fig.1 is a view which shows a relevant part schematic configuration of single-phase three-line type indoor electric power wiring for explaining embodiments of the invention; Fig.2 is a view which shows a schematic configuration of one example of a joint box which is disposed in indoor electric power wiring of an embodiment of the invention; Fig.3 is a view which shows a schematic configuration of another example of a joint box which is disposed in indoor electric power wiring of an embodiment of the invention; Fig.4 is a view which shows a schematic configuration of one example of a power outlet which is disposed in indoor electric power wiring of an embodiment of the invention; Fig.5 is a view which shows a schematic configuration of another example of a power outlet which is disposed in indoor electric power wiring of an embodiment of the invention; Fig.6 is a view which shows a schematic configuration of one example of a wiring adapter which is disposed in indoor electric power wiring of an embodiment of the invention; Fig.7 is a view which shows a partial configuration of indoor electric power wiring for explaining an embodiment of the invention; Fig.8 is a view which shows a schematic configuration of one example of a switch member which is disposed in indoor electric power wiring of an embodiment of the invention; Fig.9 is a view which shows a schematic configuration of one example of a table tap which is utilized as indoor electric power wiring of an embodiment of the invention; Fig.10 is a view which shows a schematic configuration of one example of an adapter device which is utilized for indoor electric power wiring of an embodiment of the invention; Fig.11 is a view which shows a schematic configuration of an embodiment of an electric power line carrier communication adapter device of the invention; Fig. 12 is a view which shows a schematic configuration of an embodiment of an electric power line carrier communication adapter device of the invention; and Fig. 13 is a view which shows a schematic configuration of an embodiment of an electric power line carrier communication adapter device of the invention Best Mode for Carrying Out the Invention Hereinafter, embodiments of the invention will be described by use of drawings. Fig.l shows a relevant part schematic configuration of single-phase three-line type indoor electric power wiring for explaining embodiments of the invention. The single-phase three-line type electric power wiring is composed of a first voltage line Ll, a second voltage line L2, and a neutral line N, and wired indoors through a main blocking unit 1. An alternating voltage of 100V is supplied between the first voltage line Ll and the neutral line N, and between the second voltage line and the neutral line N, and phases of respective alternating voltages are inverted, and therefore, a voltage between the first voltage line Ll and the second voltage line L2 becomes an alternating voltage of 200V In case of providing electric power of 100V to an indoor electric device, it is provided to two lines of the first voltage line Ll and the neutral line N, or two lines of the second voltage line and the neutral line N, through an outlet which was disposed at each indoor place, or by connecting them directly. In addition, in case of providing high voltage electric power of 200V, it is provided by two lines of the first voltage line Ll and the second voltage line L2. Meanwhile, in case of providing electric power of 200 V, it is common to connect them including the neutral line for the purpose of installation. In Fig.1, an 100 V outlet (hereinafter, in case of describing simply as "outlet", it points out "100V outlet") 2a is connected to the first voltage line Ll and the neutral line N, and outlets 3a, 3b, 3c, 3d are connected to the second voltage line L2 and the neutral line N. Then, an 100V alternating voltage is supplied from the outlets 3b, 3d to 100V electric devices 52, 53, respectively. Communication devices 8a, 8b, 8c are connected to the outlets 2a, 3 a, 3 c, through modems 7a, 7b, 7c, respectively, which enables electric power line carrier communication. Meanwhile, in Fig.1, the modems 7a, 7b, 7c and the communication devices 8a, 8b, 8c are described as separate elements, but it is all right even if the communication devices 8a, 8b, 8c incorporate respective modems 7a, 7b, 7c therein. In addition, power supply to the communication devices 8a, 8b, 8c is carried out from the outlets 2a, 3a, 3c or other outlets, although a graphic representation was omitted. There are many cases in which electric power is supplied to electric devices such as illuminating devices, without passing through outlets, and the first voltage line Ll and the neutral line N, or the second voltage line L2 and the neutral line N are connected directly. In Fig.l, an 100V electric device 51 is connected directly, and an electric device 54 is connected through a switch section 541. To 200V outlets 4a, 4b for supplying electric power to 200V electric devices, three-lines of the first voltage line Ll, the second voltage line L2 and the neutral line N are connected. In Fig.1, electric power is supplied from the 200V outlet 4a to a 200V electric device 6. In indoor electric power wiring, in order to be connected to many outlets and electric devices, joint boxes 91, 92 are disposed at each place of a line. The joint boxes 91, 92 are ones which carry out branching of electric power wiring, and connect a power supplying side line and a plurality of power supplied side lines. Meanwhile, in the following explanation, the power supplying side means a side which is close to the blocking unit 1 and a distribution board (not shown in the figure) which were connected to outdoor wiring, and the power supplied side means a side which is distant from the blocking unit 1 and the distribution board (not shown in the figure), i.e., a side which is close to an electric device to which electric power is supplied or a communication device which carries out electric power line carrier communication. In Fig.l, the joint box 91 branches a power supplying side line 91a of the main blocking unit 1 side into a line 91b which is connected to the outlet 3 a and a line 91c which is connected to the joint box 92. In addition, the joint box 92 branches the power supplying side line 91c of the joint box 91 side into a line 92a which is connected to the 100V electric device 64, a line 92b which is connected to the 100V electric device 51, and a line 92c which is connected to the outlet 3b. Communication among the communication devices 8a, 8b, 8c is carried out through the use of two lines of electric power line, and for example, carried out by an OFDM system. As apparent 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 Ll and the neutral line N, and the communication devices 8b and 8c are not directly connected. In order to reduce the impact due to such a fact that they are not directly connected, an adapter device 10 is connected to the 200V outlet 4b. The adapter device 10 will be described later. In indoor electric power wiring of Fig.1, a common mode choke is connected to midstream of an electric power wiring line. The common mode choke to be connected is set up in such a manner that a common mode impedance value in a carrier frequency band of electric power line carrier communication which utilizes this indoor electric power wiring becomes a sufficiently large value. A carrier frequency band of electric power line carrier communication, which is utilized here, is of, for example, 2MHz through 30MHz, and an impedance value is, for example, lkΩ or more. When the suchlike common mode choke is inserted, it is possible to consume common mode currents, which were generated in a transmission line, as heat, and it is possible to suppress occurrence of high frequency noises. In addition, an impedance value of the common mode choke in a differential mode in the carrier frequency band is set up to be a sufficiently small value, for example, several dozen Ω or less. It is possible to dispose the common mode choke which was described above, in a branch section which connects a power supplying side line and a plurality of power supplied side lines, in the joint boxes 91, 92 in case of indoor wiring of Fig.1. Fig.2 shows a schematic configuration of one example of a joint box in which a common mode choke was disposed. A joint box of Fig.2 is configured by including power supplying side terminals 902a, 902b, power supplied side terminals 903a, 903b, and a common mode choke 910, and these are placed in a housing 901 which is shown schematically. The power supplying side terminals 902a, 902b are connected to a power supplying side line 920, and the power supplied side terminals 903 a, 903 b are connected to power supplied side lines 931, 932. The common mode choke is connected between the power supplying side terminals 902a, 902b and the power supplied side terminals 903 a, 903b. In an example of Fig.2, the power supplied side terminals 903a, 903b are connected to two sets of power supplied side lines, but they may be three sets or more. Fig.3 shows a schematic configuration of another example of a joint box in which a common mode choke was disposed. The joint box of Fig.3 is the same as the joint box of Fig.2, except for such a point that a common mode choke and a power supplied side terminal are disposed so as to correspond to the number of branches. In the joint box of Fig.3, disposed are power supplied side terminals 904a, 904b which are connected to the power supplied side line 931, and power supplied side terminals 905a, 905b which are connected to the power supplied side line 932. Then, a common mode choke 911 is connected between the power supplying side terminals 902a, 902b and the power supplied side terminals 904a, 904b, and a common mode choke 912 is connected between the power supplying side terminals 902a, 902b and the power supplied side terminals 905a, 905b. In this manner, a common mode choke is disposed with respect to each branch line, and thereby, it is possible to suppress such a matter that common node noises at one branch line come over to the other branch line. It is also possible to dispose a common mode choke in a power outlet. Fig.4 shows a schematic configuration of one example of a power outlet in which a common mode choke was disposed. The power outlet of Fig.4 is configured by including power supplying side terminals 302a, 302b, power jacks 303a, 303b, 304a, 304b, and a common mode choke 310, and these are placed in a housing 301 which is shown schematically. The power supplying side terminals 302a, 302b are connected to power supplying side lines (not shown in the figure) which are inserted through power cable holes 305a, 305b. The common mode choke 310 is connected between the power supplying side terminals 302a, 302b and the power jacks 303a, 303b, 304a, 304b. Fig.5 shows a schematic configuration of another example of a power outlet in which a common mode choke was disposed. The power outlet of Fig.5 is the same as the power outlet of Fig.4, except for such a point that connection to a power supplied side line becomes possible. The power outlet of Fig.5 has power jacks 306a, 306b to which power cables (not shown in the figure), which become power supplied side lines, can be connected. Then, the common mode choke 310 is connected between the power supplying side terminals 302a, 302b and the power jacks 306a, 306b. Meanwhile, the power cables, which become power supplied side lines, are inserted through power cable holes 305a, 305b. The power outlet of Fig.5 is utilized as, for example, the power outlet 3c of Fig.l. It is also possible to dispose a common mode choke in a wiring adapter which is connected to a power supplying side terminal of a power outlet. Fig.6 shows a schematic configuration of one example of a wiring adapter in which a common mode choke was disposed. The wiring adapter of Fig.6 is configured by including power supplying side terminals 322a, 322b, power supplied side terminals 323a, 323b, outlet connecting members 324a, 324b, and a common mode choke 320, and these are placed in a housing 321 which is shown schematically. The power supplying side terminals 322a, 322b are connected to power supplying side lines (not shown in the figures) which are inserted through power cable holes 325a, 325b. The common mode choke 320 is connected between the power supplying side terminals 322a, 322b and the power supplied side terminals 323a, 323b. The outlet connecting members 324a, 324b are connected to the power supplied side terminals 323a, 323b, and connected to power supplying terminals of a power outlet. Therefore, the wiring adapter, which is shown in Fig.6, is to be disposed between a power supplying side line and a power outlet, and it is possible to connect a common mode choke to a power supplying side line of a power outlet, without exchanging a power outlet. Meanwhile, it is common that a power outlet for indoor wiring is of such a configuration that it can be easily connected by peeling off a coating of a cable and inserting copper lines into holes which exist in the outlet, and therefore, it is possible to add a wiring adapter easily, by shaping the outlet connecting members 324a, 324b of the wiring adapter shown in Fig.6, so as to be able to be inserted into holes of an outlet. It is also possible to dispose a common mode choke in a switch member which are two-line-connected between a power supplying side line and a power supplied side line. A switch member, which is two-line-connected, is disposed, as shown in Fig.7, in the way of a power supplying line to an 100 V electric device such as an illuminating device. Fig.7 extracts and shows a line between the joint box 92 of indoor electric power wiring and the 100V electric device 54. Fig.8 shows a schematic configuration of one example of a switch member in which a common mode choke was disposed. The switch member of Fig.8 is configured by including power supplying side terminals 5422a, 5422b, power supplied side terminals 5423a, 5423b, a common mode choke 5420, and a switch element 5430, and these are placed in a housing 5421 which is shown schematically. The power supplying side terminals 5422a, 5422b are connected to power supplying side lines (not shown in the figure) which are inserted through power cable holes 5424a, 5424b, and the power supplied side terminals 5423a, 5423b are connected to power supplied side lines (not shown in the figure) which are inserted through power cable holes 5425a, 5425b. The common mode choke 5420 is connected between the power supplying side terminals 5422a, 5422b and the power supplied side terminals 5423a, 5423b. In addition, the switch element 5430 is connected between the common mode choke 5420 and the power supplied side terminal 5423b. In case that the switch element is a thing having two contacts, it is connected between the common mode choke 5420 and the power supplied side terminals 5423a, 5423b. In case that the switch element is inserted into one wiring, one line is lengthened so that balance of the line is lowered, but when the switch member of Fig.8 is utilized, it is possible to reduce deterioration of balance due to existence of the switch element. In addition, it is also possible to reduce common mode noises by the common mode choke. It is also possible to dispose a common mode choke in a table tap which is utilized as a part of electric power wiring. Fig.9 shows a schematic configuration of one example of a table tap in which a common mode choke was disposed. The table tap of Fig.9 is configured by including a power plug 16 which is inserted into a power jack (not shown in the figure) of a power outlet, a power cord 17, and a tap housing 18. The power plug 16 has power plug terminals 161a, 161b and is inserted into a power jack (not shown in the figure) of a power outlet. In the tap housing 18 shown schematically, placed are power supplying side terminals 181a, 181b, power jacks 182a, 182b, 183a, 183b, and a common mode choke 180. The power supplying side terminals 181a, 181b are connected to the power plug terminals 161a, 161b through the power cord 17. In addition, the common mode choke 180 is connected between the power supplying side terminals 181a, 181b and the power jacks 182a, 182b, 183a, 183b. Next, an adapter device 10, which is inserted into the 200V outlet 4a, will be described. Fig.10 shows a schematic configuration of one example of the adapter device 10. The adapter device 10 of Fig.10 is one which is used by being connected to the 200V outlet, and includes power plug terminals 111, 112, UN, a capacitor 12, and power jacks 131, 132, 13N, and is placed in an adapter housing which is shown schematically. The power plug terminals 111, 112 are inserted into a power jack (not shown in the figure) of the 200V outlet, and connected to the first voltage line Ll or the second voltage line L2. In addition, the power plug terminal 1 IN is inserted into the power jack (not shown in the figure) of the 200 V outlet, in the same manner, and is connected to the neutral line N. The capacitor 12 is an impedance element which is connected between the power plug terminals 111, 112, and an absolute value of impedance thereof is set up to a value of such a level that it is substantially negligible in a carrier frequency band of electric power line carrier communication. Here, The value of such a level that it is substantially negligible in a carrier frequency band of electric power line carrier communication means a value of such a level that an absolute value of impedance in carrier frequency of electric power line carrier communication is substantially negligible, in order for signals of electric power line carrier communication to be conveyed from the first voltage line Ll to the second voltage line L2 or from the second voltage line L2 to the first voltage line Ll without large attenuation. As a result of that, the capacitor 12 functions as a bypass element between the first voltage line Ll and the second voltage line L2. Here, a carrier frequency band of electric power line carrier communication which is used is of 2MHz through 30MHz, and an absolute value of impedance in that band is, for example, 10Ω. The power jacks 131, 132, 13N are connected to the power plug terminals 111, 112, UN, respectively, and configured in such a manner that another power plug can be inserted. Therefore, even if the adapter device 10 of Fig.l is inserted into a 200V outlet, it is possible to supply alternating electric power of 200V from that outlet to a 200V outlet. Meanwhile, in case that there is no need to supply electric power from an outlet into which the adapter device 10 was inserted, the power jacks 131, 132, 13N are unnecessary. In addition, it is also possible to "omit the power plug terminal UN. Fig.11 shows a schematic configuration of a second example of an electric power line carrier communication adapter device. An adapter device 10 of Fig.11 is one which is used by being inserted into a power jack (not shown in the figure) of a 200 V outlet, in the same manner as one in Fig.10. A point which is different from one in Fig.10 is on such a point that choke coils 141, 142, 14N were connected respectively between the power plug terminals 111, 112, UN and the power jacks 131, 132, 13N. Other elements are identical to those in Fig.10 and identical numbers are given thereto, and therefore, explanations thereof will be omitted. An absolute value of impedance of the choke coils 141, 142, 14N is set up to a sufficiently large value in a carrier frequency band of electric power line carrier communication. Here, the sufficiently large value in a carrier frequency band of electric power line carrier communication is a value with such a level that, even in case that a high voltage electric device was connected to the power jacks 131, 132, 13N, it is possible to suppress impedance fluctuation (including fluctuation due to presence or absence of an electric device) of that electric device, and an absolute value of impedance in a frequency band of for example, 2MHz through 30MHz is, for example, 100Ω or more. Fig. 12 shows a schematic configuration of a third example of an electric power line carrier communication adapter device. An adapter device 10 of Fig. 12 is one which is used by being inserted into a power jack (not shown in the figure) of a 200V outlet, in the same manner as ones in Figs. 10 and 11. A point which is different from one in Fig. 11 is on such a point that a filter circuit 15 was connected between choke coils 141, 142 and power jacks 131, 132. Other elements are identical to those in Figs. 10 and 11 and identical numbers are given thereto, and therefore, explanations thereof will be omitted. The filter circuit 15 is one for attenuating normal mode noises from a high voltage electric device which was connected to the power jacks 131, 132, 13N. There is also a filter circuit 15 which has a shock absorber function. In Fig. 12, a π type filter was shown as one example, but filter circuits, which are shown in Figures. 6 through 8 of JP-A-2003-218754, may be used. Fig. 13 shows a schematic configuration of a fourth example of an electric power line carrier communication adapter device. An adapter device 10 of Fig. 13 is one which is utilized as a table tap, and is configured by including a power plug 16 which is inserted into a power jack (not shown in the figure) of a 200V power outlet, a power cord 17, and a tap housing 18 which contains an impedance element etc. in an inside thereof. The power plug 16 has power plug terminals 161, 162 and 16N, and is inserted into a power jack (not shown in the figure) of a 200 V power outlet. The power plug terminals 161, 162 are ones which are connected to the first voltage line Ll or the second voltage line L2, and the power plug terminal 16N is one which is connected to the neutral line N. In the tap housing 18 shown schematically, placed are tap connection terminals 181, 182, 18N, a capacitor 12, power jacks 131a through 131c, 132a through 132c, 13Na through 13Nc. The tap connection terminals 181, 182 are connected to the first voltage line Ll or the second voltage line L2, through the power cord 17, the power plug terminals 161, 162, or a power jack (not shown in the figure) of a 200V outlet. In addition, the tap connection terminal 18N is inserted into a power jack (not shown in the figure) of a 200V outlet, and connected to the neutral line N, in the same manner. The capacitor 12 is an impedance element which is connected between the tap connection terminals 181, 182, and is one which is the same as the capacitor in the adapter device in Figs.10 through 12. The tap connection terminals 181, 182, 18N are connected to the power jacks 13 la through 131c, 132a through 132c, and 13Na through 13Nc, respectively, and are configured in such a manner that another power plug can be inserted therein. In an example of Fig. 13, three pieces of other power plugs can be connected, but the number thereof is arbitrary. In Fig. 13, the tap connection terminals 181, 182 are directly connected to the power jacks 131a through 131c, 132a through 132c, respectively, but it is also all right even if a choke coil, which has the same function as one in Fig. 11, is connected between the tap connection terminals 181, 182, 18N and the power jacks 131a through 131c, 132a through 132c, 13Na through 13Nc. An absolute value of impedance of this choke coil is set up to a value which is the same as one in Fig. 11. This application is based upon and claims the benefit of priorities of Japanese

Patent Application No. 2004-147709 and 2004-147716 both filed on May 18, 2004, the contents of which are incorporated herein by reference in its entirety.

Industrial Applicability As mentioned above, the invention is useful for indoor electric power wiring which is utilized for electric power line carrier communication, and as a joint box, a wiring adapter, a switch member, a table tap etc. which are utilized for the suchlike indoor electric power wiring.

Claims

1. An indoor electric power wiring which is used for electric power line carrier communication, comprising: a common mode choke which is connected to midstream of an electric power wiring line.

2. The indoor electric power wiring as set forth in Claim 1, further comprising a branch section which connects a power supplying side line and a plurality of power supplied side lines, wherein the common mode choke is connected between the power supplying side and each of the power supplied side lines of the branch section.

3. The indoor electric power wiring as set forth in Claim 2, wherein the branch section is configured by a joint box having a power supplying side terminal which is connected to the power supplying side line, a power supplied side terminal which his connected to the power supplied side line, and the common mode choke which is connected between the power supplying side terminal and the power supplied side terminal.

4. The indoor electric power wiring as set forth in Claim 1, wherein the common mode choke is disposed in a power outlet, and is connected between a power supplying side terminal to which a power supplying side line of the power outlet is connected, and a jack conductor of the outlet.

5. The indoor electric power wiring as set forth in Claim 1, further comprising a wiring adapter which is connected to a power supplying side terminal of a power outlet, wherein the wiring adapter has a power supplying side terminal which is connected to a power supplying side line, and an outlet connection terminal which is connected to a power supplying side terminal of the power outlet, and the common mode choke is connected between the power supplying side terminal and the outlet connection terminal.

6. The indoor electric power wiring as set forth in Claim 1, further comprising a switch member which is two-line-connected between a power supplying side line and a power supplied side line, wherein the common mode choke is connected between a power supplying side terminal and a power supplied side terminal of the switch member, and a switch element of the switch member is disposed between the common mode choke and the power supplied side terminal.

7. The indoor electric power wiring as set forth in Claim 1, further comprising a table tap which is connected to a power outlet, wherein the common mode choke is connected between a power jack and a power cord of the table tap.

8. The indoor electric power wiring as set forth in Claim 1, wherein the common mode choke is greater than lkΩ as a common mode impedance value in a carrier frequency band of electric power line carrier communication.

9. A joint box which branches indoor electric power wiring, comprising: a power supplying side terminal which is connected to a power supplying side line, a power supplied side terminal which is connected to a power supplied side line, and a common mode choke which connects the power supplying side terminal and the power supplied side terminal.

10. The joint box as set forth in Claim 9, wherein the common mode choke is greater than lkΩ as a common mode impedance value in a carrier frequency band of electric power line carrier communication which uses the indoor wiring.

11. A wiring adapter which is connected to a power supplying side terminal of a power outlet of indoor electric power wiring, comprising: a power supplying side terminal which is connected to a power supplying side line, an outlet connection terminal which is connected to a power supplying side terminal of the power outlet, and a common mode choke which is connected between the power supplying side terminal and the outlet connection terminal.

12. The wiring adapter as set forth in Claim 11, wherein the common mode choke is of greater than lkΩ as a common mode impedance value in a carrier frequency band of electric power line carrier communication which uses the indoor wiring.

13. A switch member which is two-line-connected to indoor electric power wiring, comprisiing: a power supplying side terminal which is connected to a power supplying side line, a power supplied side terminal which is connected to a power supplied side line, a common mode choke which is connected between the power supplying side terminal and the power supplied side terminal, and a switch element which is disposed between the common mode choke and the power supplied side terminal.

14. The switch member as set forth in Claim 13, wherein the common mode choke is greater than lkΩ as a common mode impedance value in a carrier frequency band of electric power line carrier communication which uses the indoor wiring.

15. A table tap comprising: a power plug which is inserted into a power outlet of indoor electric power wiring, a tap section which has plural sets of power jacks, and a power cord which is connected to the power plug and the tap section, wherein the tap section has a common mode choke which is connected between a power supplying side conductor to which the power cord is connected, and the power jack.

16. The switch member as set forth in Claim 15, wherein the common mode choke is greater than lkΩ as a common mode impedance value in a carrier frequency band of electric power line carrier communication which uses the indoor wiring.

17. A power line carrier communication adapter device which is utilized for electric power line carrier communication utilizing single-phase three-line type indoor electric power wiring and is inserted into a high voltage outlet to which a first voltage line and a second voltage line of the electric power wiring are connected, comprising a first conductor which is connected to one of the first voltage line and the second voltage line, a second conductor which is connected to the other of the first voltage line and the second voltage line, and an impedance element which was connected between the first conductor and the second conductor.

18. The electric power line carrier communication adapter device as set forth in Claim 17, wherein a carrier frequency band of the electric power line carrier communication is of 2MHz through 30MHz.

19. The electric power line carrier communication adapter device as set forth in Claim 17, wherein an absolute impedance of the impedance element is less than 10Ω in a carrier frequency band of electric power line caπier communication, in order for signals of electric power line carrier communication to be conveyed from the first voltage line to the second voltage line or from the second voltage line to the first voltage line.

20. The electric power line carrier communication adapter device as set forth in Claim 17, wherein the impedance element is a capacitor.

21. The electric power line carrier communication adapter device as set forth in Claim 17, wherein the first conductor and the second conductor are power plug terminals which are inserted into the high voltage outlet.

22. The electric power line carrier communication adapter device as set forth in Claim 21, wherein the power plug terminal is connected to a power jack into which another power plug can be inserted.

23. The electric power line carrier communication adapter device as set forth in Claim 22, further comprising a choke coil which is connected between the power plug terminal and the power jack, wherein an impedance value of the choke coil is greater than 100Ω in a carrier frequency band of electric power line carrier communication.

24. The electric power line carrier communication adapter device as set forth in Claim 17, further comprising a power plug which is inserted into the high voltage outlet, a power cord which is connected to the power plug, the first conductor and the second conductor, and a power jack which is connected to the first conductor and the second conductor, the electric power line carrier communication adapter device being utilized as a table tap.

25. The electric power line carrier communication adapter device as set forth in Claim 24, further comprising a choke coil which is connected between the first conductor, the second conductor and the power jack, wherein an impedance value of the choke coil is greater than 100Ω in a carrier frequency band of electric power line carrier communication.