JPS6373821A - Insulating spacer - Google Patents
Insulating spacerInfo
- Publication number
- JPS6373821A JPS6373821A JP21265286A JP21265286A JPS6373821A JP S6373821 A JPS6373821 A JP S6373821A JP 21265286 A JP21265286 A JP 21265286A JP 21265286 A JP21265286 A JP 21265286A JP S6373821 A JPS6373821 A JP S6373821A
- Authority
- JP
- Japan
- Prior art keywords
- insulating spacer
- insulating
- main body
- connecting flange
- metal container
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 125000006850 spacer group Chemical group 0.000 title claims description 77
- 239000002184 metal Substances 0.000 claims description 42
- 239000004020 conductor Substances 0.000 claims description 10
- 238000012856 packing Methods 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000005266 casting Methods 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Landscapes
- Installation Of Bus-Bars (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は絶縁スペーサに係り、特にＳＦｒ、ガスのよう
な絶縁ガスを絶縁媒体とするガス絶縁開閉装置や管路気
中送電装置等に使用される絶縁スペーサの改良に関する
。[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to an insulating spacer, and particularly to gas insulated switchgear and pipelines in which an insulating gas such as SFr or gas is used as an insulating medium. This invention relates to improvements in insulating spacers used in power transmission equipment, etc.
（従来の技術）
ガス絶縁開閉装置や管路気中送電装置では、高電圧導体
を接地された金属容器内に絶縁支持して収納するため、
絶縁スペーサが数多く使用される。(Prior art) In gas-insulated switchgear and pipeline air power transmission equipment, high-voltage conductors are insulated and supported in a grounded metal container.
Many insulating spacers are used.
この絶縁スペーサは例えば特公昭５４−４４１０６号公
報及び特開昭５５−１５５５１２号公報に示すようにエ
ポキシ樹脂などの熱硬化性合成樹脂からなる絶縁スペー
サ本体で高電圧導体を支持し、この絶縁スペーサのフラ
ンジ部に取付ボルト用の埋金が埋めこまれている。さら
にＳＦ６ガスは不平等電界で絶縁性能が低下する傾向に
あるため、この対策とじて高電圧導体の周りに接地シー
ルドが一体に埋めこまれ、この電位は取付ボルト孔を兼
用する接地用金具を介して確保しているのが、普通であ
る。This insulating spacer supports a high voltage conductor with an insulating spacer body made of thermosetting synthetic resin such as epoxy resin, as shown in Japanese Patent Publication No. 54-44106 and Japanese Patent Application Laid-open No. 55-155512. A filler metal for the mounting bolt is embedded in the flange. Furthermore, since SF6 gas tends to have poor insulation performance due to unequal electric fields, as a countermeasure to this, a grounding shield is integrally embedded around the high voltage conductor, and this potential is connected to a grounding fitting that also serves as the mounting bolt hole. Normally, this is secured through
従来の絶縁スペーサは第５図及び第６図に示すように、
接地された金属容器３内に絶縁スペーサ４０で絶縁支持
された高電圧導体１を収納し、金属容器３内にＳＦＧガ
スのような絶縁ガス２を封入している。高電圧導体１相
互を接合する通電部材４１は絶縁スペーサ本体４と一体
に注形されている。As shown in FIGS. 5 and 6, the conventional insulating spacer is
A high voltage conductor 1 insulated and supported by an insulating spacer 40 is housed in a grounded metal container 3, and an insulating gas 2 such as SFG gas is sealed in the metal container 3. The current-carrying member 41 that connects the high voltage conductors 1 to each other is cast integrally with the insulating spacer body 4.
また絶縁スペーサ４０は！＠縁ススペーサ本体４フラン
ジ部分にネジ付き金具６が一体に注形されている。さら
に、絶縁スペーサ本体４に一体に注形された導電性リン
グ７１が埋設されている。この導電リング７１は常時接
地され、金属容器３と絶縁スペーサ本体４０との結合部
の電界を緩和し、絶縁性能の向上に寄与している。そし
て、金属容器３に設けられた連結フランジ５に絶縁スペ
ーサのフランジ部分すなわちネジ付き金具６と両連結フ
ランジ５を貫通するようにスタッド８の両端側をナツト
８ａによってボルト締めのようにして締付け、また絶縁
スペーサ本体４に設けたパツキン溝に０リングのような
パッキング３１を収めて、連結フランジ５間の気密を保
持している。Also, the insulating spacer 40! @A threaded metal fitting 6 is integrally cast on the flange portion of the edge spacer main body 4. Further, a conductive ring 71 integrally cast into the insulating spacer body 4 is embedded therein. This conductive ring 71 is always grounded, relieves the electric field at the joint between the metal container 3 and the insulating spacer body 40, and contributes to improving insulation performance. Then, both ends of the stud 8 are tightened like bolts with nuts 8a so as to pass through the flange portion of the insulating spacer, that is, the threaded metal fitting 6, and both connecting flanges 5 on the connecting flange 5 provided on the metal container 3. Further, a packing 31 such as an O-ring is housed in a packing groove provided in the insulating spacer body 4 to maintain airtightness between the connecting flanges 5.
しかしながら、このような従来の絶縁スペーサ４０にお
いて、次のような不都合な点がある。すなわち、絶縁ス
ペーサ本体内にネジ付金具を一体に注形する必要があり
、注形時に注形工数がががることからコスト高になる。However, such a conventional insulating spacer 40 has the following disadvantages. That is, it is necessary to integrally cast the threaded fitting inside the insulating spacer main body, which increases the number of steps required during casting, resulting in higher costs.
また、絶縁部材内に金属を一体に注形することは機構的
、特に熱応力的にも好ましくなく、クラック割れ発生の
原因にもなる。従って、絶縁部材内に一体注形されるネ
ジ付金具を省略することもしくは削減することが要望さ
れていた。Furthermore, integrally casting metal into an insulating member is not preferable from a mechanical standpoint, especially from the standpoint of thermal stress, and may cause cracks to occur. Therefore, it has been desired to omit or reduce the threaded fittings integrally cast within the insulating member.
更に、従来の絶縁スペーサ４ｏにおいては、屋外用ガス
絶縁開閉装置や管路気中送電装置として適用する場合、
ネジ付き金具内部に水分が侵入する恐れがあり何らかの
対策が必要であった。Furthermore, when the conventional insulating spacer 4o is applied as an outdoor gas insulated switchgear or a conduit aerial power transmission device,
There was a risk of moisture intruding into the threaded metal fittings, so some kind of countermeasure was needed.
（発明が解決しようとする問題点）
上記のように、従来の絶縁スペーサにおいては、機械的
強度が低下する問題及び屋外用としての水分の侵入の問
題が存在していた。(Problems to be Solved by the Invention) As described above, conventional insulating spacers have problems of reduced mechanical strength and moisture intrusion when used outdoors.
本発明は、この様な問題点を解決するために提案された
ものであり、その目的は、構造に簡単な改良を施すこと
により、製作作業の容易化を図り且つ機械応力的にも優
れ、且つ、屋外用としても適用可能な絶縁スペーサを提
供することである。The present invention was proposed in order to solve these problems, and its purpose is to simplify the manufacturing work by making simple improvements to the structure, and to achieve excellent mechanical stress. Another object of the present invention is to provide an insulating spacer that can be used outdoors.
（問題点を解決するための手段）
本発明は、絶縁スペーサ本体の外周面まで金属容器の連
結フランジを設け、絶縁スペーサ本体をお互いの連結フ
ランジ同志で挟持し密封する構造にしたことを特徴とし
ている。(Means for Solving the Problems) The present invention is characterized in that a connecting flange of the metal container is provided up to the outer peripheral surface of the insulating spacer body, and the insulating spacer body is sandwiched and sealed between the connecting flanges. There is.
また、連結フランジ部と接触する絶縁スペーサ本体にネ
ジ付き金具を絶縁スペーサの円周上に対向して２個一体
性形したことを特徴としている。Further, it is characterized in that two threaded metal fittings are integrally formed on the insulating spacer main body that contacts the connecting flange portion, facing each other on the circumference of the insulating spacer.
（作 用）
本発明によれば、絶縁スペーサ本体には金属容器の連結
フランジ部と接合するためのネジ付き金具はなく、絶縁
スペーサは絶縁スペーサ本体の外周面の連結フランジで
密封構造で挟持されるのみであるため１本構造は簡略で
製作作業が容易であり、その構造上、機械的特性に優れ
、クラックが発生したりすることもなく、且つ、屋外用
としても水分の侵入もなく十分使用に耐える。(Function) According to the present invention, the insulating spacer main body does not have a threaded metal fitting for joining to the connecting flange portion of the metal container, and the insulating spacer is sandwiched in a sealed structure by the connecting flange on the outer peripheral surface of the insulating spacer main body. Since the single-piece structure is simple and easy to manufacture, its structure has excellent mechanical properties, does not cause cracks, and is suitable for outdoor use without moisture intrusion. Durable to use.
また、絶縁スペーサの金属容器への組立作業において、
絶縁スペーサ本体に一体に注形された２個のネジ付き金
具にて作業性が損われることがない。なお、最終的な絶
縁スペーサ取付形態はネジ付き金具にスタッドまたは通
しボルトで締め付ける必要がなく、それによる締め付は
応力はネジ付き金具に加わらないため、その構造上クラ
ックが発生する心配がないことは言うまでもない。In addition, when assembling the insulating spacer to the metal container,
Two threaded metal fittings integrally cast into the insulating spacer body do not impair workability. In addition, the final installation form of the insulating spacer does not require tightening with studs or through bolts to the threaded metal fittings, and since no stress is applied to the threaded metal fittings, there is no risk of cracks occurring due to its structure. Needless to say.
（実施例）
■ 第１実施例
以下、本発明による絶縁スペーサの一実施例を第１図を
参照して説明する。(Embodiments) (1) First Embodiment An embodiment of the insulating spacer according to the present invention will be described below with reference to FIG.
率 実施例の構成
第１図において、第５図と同一部分及び同一機能を有す
る部分は同一符号を付しである。Structure of the Embodiment In FIG. 1, the same parts and parts having the same functions as those in FIG. 5 are given the same reference numerals.
即ち高電圧導体１は、絶縁ガス２を封入され、接地され
た金属容器３内に絶縁スペーサ４０を介して絶縁支持し
て収納されている。That is, the high voltage conductor 1 is housed in a grounded metal container 3 which is filled with an insulating gas 2 and is insulated and supported via an insulating spacer 40 .
絶縁スペーサ４０は高電圧導体１相互を接合する通電部
材４１を絶縁スペーサ本体４に一体注形しである。また
、絶縁スペーサ本体４のフランジ部分の内部には導電性
リングが一体に注形されている。The insulating spacer 40 is made by integrally casting a current-carrying member 41 that connects the high voltage conductors 1 to the insulating spacer body 4. Further, a conductive ring is integrally cast inside the flange portion of the insulating spacer body 4.
絶縁スペーサ本体４の外周面には金属容器３端部に設け
られた連結フランジ５により絶縁スペーサ本体は挟持さ
れ、連結フランジ５の両者はボルト９とナツト８ａによ
って締め付けられている。また、連結フランジ５がお互
いに接触する面の片側にはパッキング５１によって気密
が保持されている。The insulating spacer main body 4 is held between a connecting flange 5 provided at the end of the metal container 3 on the outer peripheral surface of the insulating spacer main body 4, and both of the connecting flanges 5 are tightened with bolts 9 and nuts 8a. Furthermore, airtightness is maintained by a packing 51 on one side of the surfaces where the connecting flanges 5 come into contact with each other.
傘 実施例の作用
この様に構成された絶縁スペーサ４０においては、従来
の様に絶縁スペーサ本体４にネジ付き金具を円周上に一
体に注形することが無いため、注形時の熱的残留応力お
よび金属容器３の連結フランジ５との締付けおよび絶縁
ガス２の圧力差による機械応力を極力小さくすることが
できるため、従来の様に機械的強度を損うことなく、絶
縁スペーサとしての性能が維持できる。Function of the Umbrella Embodiment In the insulating spacer 40 configured in this way, since the threaded metal fittings are not integrally cast on the circumference of the insulating spacer main body 4 as in the conventional case, thermal effects during casting are reduced. Residual stress and mechanical stress caused by the tightening of the metal container 3 with the connecting flange 5 and the pressure difference of the insulating gas 2 can be minimized, so the performance as an insulating spacer can be improved without sacrificing mechanical strength like in the past. can be maintained.
また、本発明の絶縁スペーサを屋外で適用しても、絶縁
スペーサ本体４に水分の侵入が無く、屋外用の仕様に十
分供することができる。Further, even when the insulating spacer of the present invention is applied outdoors, moisture does not enter the insulating spacer main body 4, and it can fully meet the specifications for outdoor use.
傘 他の実施例
なお、上記実施例では単相の絶縁スペーサについてのみ
述べたが、三相絶縁スペーサにも本発明を適用できるこ
とはもちろんである。Umbrella Other Embodiments In the above embodiments, only a single-phase insulating spacer was described, but it goes without saying that the present invention can also be applied to a three-phase insulating spacer.
本発明による絶縁スペーサの一実施例を第２図を参照し
て説明する。An embodiment of the insulating spacer according to the present invention will be described with reference to FIG.
申 実施例の構成
第２図は第１図のＮ Ａ ＩＩ ｌ（Ａ ７＋断面相
当図を示す。1. Structure of the Example FIG. 2 shows a view corresponding to the N A II l (A 7+ cross section) of FIG. 1.
基本的な構成は第１図に示した実施例と同一であるため
、同一部分に同符号を付し、説明を省略する。Since the basic configuration is the same as that of the embodiment shown in FIG. 1, the same parts are given the same reference numerals and the explanation will be omitted.
そして、実施例においては、絶縁スペーサ本体４にネジ
付き金具６が絶縁スペーサ本体４の円周に対して２個一
体性形されている。In the embodiment, two threaded metal fittings 6 are integrally formed on the insulating spacer body 4 around the circumference of the insulating spacer body 4.
また、本発明に設けられるネジ付き金具６は絶縁スペー
サ本体４内に一体注形され、ネジ付き金具６の両端面は
絶縁スペーサ本体４の表面に露出しないように形成さ才
ｔている。Further, the threaded metal fitting 6 provided in the present invention is integrally cast within the insulating spacer main body 4, and both end surfaces of the threaded metal fitting 6 are formed so as not to be exposed on the surface of the insulating spacer main body 4.
本 実施例の作用
以上の様な構成を有する本実施例の作用は次の通りであ
る。Functions of this embodiment The functions of this embodiment having the above-described configuration are as follows.
従来のように絶縁スペーサ本体４にネジ付き金具６が円
周上にあり、スタッドがないこと、絶縁スペーサ４０を
金属容器３に順次設置していく場合、作業性が損われる
恐れがある。If the insulating spacer main body 4 has threaded metal fittings 6 on the circumference and no studs as in the conventional case, and if the insulating spacers 40 are successively installed in the metal container 3, workability may be impaired.
しかし、本実施例では、第２図に示す２個のネジ付き金
具６を利用して、第３図に示すようにボルト１０で一方
の金属容器３に取付けることができる。この作業工程で
は、絶縁スペーサ４０を金属容器に固定するのみである
ためネジ付き金具６が２個で機械強度的に十分である。However, in this embodiment, the two threaded metal fittings 6 shown in FIG. 2 can be used to attach to one metal container 3 with bolts 10 as shown in FIG. 3. In this work step, since the insulating spacer 40 is only fixed to the metal container, two threaded metal fittings 6 are sufficient in terms of mechanical strength.
且つ、最終的組立形態では、第４図に示すように、ネジ
付き金具６の部分の連結フランジのネジ穴１１を利用し
てパッキング付ボルト１２により気密を保つ構造になっ
ているため、第１の発明の屋外使用に何ら支障をきたさ
ない。In addition, in the final assembled form, as shown in FIG. 4, the screw hole 11 of the connection flange of the threaded metal fitting 6 is used to maintain airtightness with the packing bolt 12, so that the first There is no problem in using the invention outdoors.
このように、本実施例では、絶縁スペーサ４０と連結フ
ランジ５との接合に関してネジ付き金具６は使用してい
ないため、従来のように機械的強度を損うことなく絶縁
スペーサとしての性能が維持できる。In this way, in this embodiment, since the threaded metal fitting 6 is not used for joining the insulating spacer 40 and the connecting flange 5, the performance as an insulating spacer is maintained without compromising mechanical strength as in the conventional case. can.
以上説明したように、本発明によれば、絶縁スペーサ本
体の外周面に設けた両連結フランジ同志を通しボルトで
締付は気密を施すことのみで絶縁スペーサを金属容器に
支持固定するため構成の簡略化、製作作業の容易化、及
び機械的強度の向上を実現し、且つ屋外使用に酎える絶
縁スペーサを得られる。As explained above, according to the present invention, the insulating spacer is supported and fixed to the metal container by simply tightening the bolts through both connecting flanges provided on the outer peripheral surface of the insulating spacer body to provide airtightness. It is possible to obtain an insulating spacer that achieves simplification, facilitates manufacturing work, and improves mechanical strength, and can be used outdoors.
また、ネジ付き金具を利用できるため絶縁スペーサの組
立作業性を損うことがない。また、絶縁スペーサの最終
組立形態では、金属容器への絶縁スペーサ取付けに関し
てネジ付き金具を使用していないため、機械的特性の優
れた絶縁スペーサを提供できる。Furthermore, since threaded metal fittings can be used, the workability of assembling the insulating spacer is not impaired. Further, in the final assembled form of the insulating spacer, no threaded metal fittings are used for attaching the insulating spacer to the metal container, so it is possible to provide an insulating spacer with excellent mechanical properties.
第１図は本発明による絶縁スペーサの一実施例を示す中
心線片側縦断面図、第２図は第２の実施例を示す第１図
の１１ Ａ ７１ Ｉｔ Ａ Ｉ＋断面相当図、第３
図は本発明の絶縁スペーサを金属容器に固定する方法を
示した中心線片側縦断面図、第４図は本発明の気密を施
す方法を示した絶縁スペーサの一実施例を示す中心線片
側縦断面図、第５図は従来の絶縁スペーサを示す中心線
片側縦断面図、第６図は第５図のＩＩ Ａ ＩＩ Ｉ
Ｚ Ａ Ｉ＋断面図である。
１・・・高電圧導体、 ２・・・絶縁ガス３・・・金
属容器、 ４・・・絶縁スペーサ本体５・・・連結
フランジ、 ６・・・ネジ付き金具８・・・スタッド、
８ａ・・・ナツト９・・・通しボルト、 １０
・・・ボルト３１・・・パッキング、 ４ｏ・・・絶
縁スペーサ４１・・・通電部材、 ５１・・・パッ
キング７１・・・導電性リング、 １１・・・ネジ穴１
２パッキング付ボルト
代理人 弁理士 則 近 憲 佑
同 三俣弘文
°Ａ″
第１図
第２図
第３図
第４図
Ａ
第５図FIG. 1 is a vertical cross-sectional view of one side along the center line showing an embodiment of the insulating spacer according to the present invention, FIG. 2 is a view corresponding to the 11 A 71 It A I+ section of FIG.
The figure is a vertical cross-sectional view of one side along the center line showing a method for fixing the insulating spacer of the present invention to a metal container, and FIG. A top view, FIG. 5 is a vertical cross-sectional view of one side along the center line showing a conventional insulating spacer, and FIG.
It is a Z A I+ sectional view. DESCRIPTION OF SYMBOLS 1...High voltage conductor, 2...Insulating gas 3...Metal container, 4...Insulating spacer body 5...Connecting flange, 6...Threaded fitting 8...Stud,
8a...Nut 9...Through bolt, 10
... Bolt 31 ... Packing, 4o ... Insulating spacer 41 ... Current-carrying member, 51 ... Packing 71 ... Conductive ring, 11 ... Screw hole 1
2 Bolt with packing agent Patent attorney Nori Ken Chika Yudo Hirofumi Mitsumata °A'' Figure 1 Figure 2 Figure 3 Figure 4 A Figure 5
Claims (4)
持する絶縁スペーサ本体を備え、この絶縁スペーサ本体
には高電圧導体を相互に接合する通電部材が一体に注形
され、絶縁スペーサ本体の外周面には金属容器に取付け
た連結フランジが覆い、前記連結フランジにて絶縁スペ
ーサを挟持することを特徴とする絶縁スペーサ。(1) An insulating spacer body that supports a high-voltage conductor is provided in a metal container filled with insulating gas, and a current-carrying member that connects the high-voltage conductors to each other is integrally cast into the insulating spacer body. An insulating spacer characterized in that an outer peripheral surface of the insulating spacer is covered with a connecting flange attached to a metal container, and the insulating spacer is sandwiched between the connecting flange.
キング溝を施してあることを特徴とする特許請求の範囲
第１項記載の絶縁スペーサ。(2) The insulating spacer according to claim 1, characterized in that a packing groove is formed in the connecting flange on the outer peripheral surface of the insulating spacer main body.
金具を円周上に対向して２個のみ絶縁スペーサ本体に一
体注形したことを特徴とする特許請求の範囲第１項記載
の絶縁スペーサ。(3) The insulating spacer according to claim 1, characterized in that only two threaded fittings are integrally cast on the insulating spacer main body, facing each other on the circumference, at the connecting flange portion of the insulating spacer main body.
穴を設け、前記ネジ穴にパッキング付ボルトを施すこと
により気密を保つことを特徴とする特許請求の範囲第１
項記載の絶縁スペーサ。(4) A screw hole is provided in the connection flange facing the threaded metal fitting, and airtightness is maintained by providing a bolt with a packing in the screw hole.
Insulating spacer as described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21265286A JPS6373821A (en) | 1986-09-11 | 1986-09-11 | Insulating spacer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21265286A JPS6373821A (en) | 1986-09-11 | 1986-09-11 | Insulating spacer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6373821A true JPS6373821A (en) | 1988-04-04 |
Family
ID=16626172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21265286A Pending JPS6373821A (en) | 1986-09-11 | 1986-09-11 | Insulating spacer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6373821A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003333727A (en) * | 2002-05-16 | 2003-11-21 | Matsushita Electric Works Ltd | Wiring duct system, wiring duct, and plug |
| JP2003333725A (en) * | 2002-05-16 | 2003-11-21 | Matsushita Electric Works Ltd | Wiring duct |
-
1986
- 1986-09-11 JP JP21265286A patent/JPS6373821A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003333727A (en) * | 2002-05-16 | 2003-11-21 | Matsushita Electric Works Ltd | Wiring duct system, wiring duct, and plug |
| JP2003333725A (en) * | 2002-05-16 | 2003-11-21 | Matsushita Electric Works Ltd | Wiring duct |
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