JP4445186B2

JP4445186B2 - Distribution board extension structure of distribution board

Info

Publication number: JP4445186B2
Application number: JP2002223112A
Authority: JP
Inventors: 雅隆神田; 健井上; 広和進; 利勝畑中; 一志石原; 伸一端本; 利幸岡林
Original assignee: Kansai Electric Power Co Inc; Panasonic Corp; Matsushita Electric Works Ltd
Current assignee: Kansai Electric Power Co Inc; Panasonic Corp; Panasonic Electric Works Co Ltd
Priority date: 2002-07-31
Filing date: 2002-07-31
Publication date: 2010-04-07
Anticipated expiration: 2022-07-31
Also published as: JP2004064962A

Description

【０００１】
【発明の属する技術分野】
本発明は、分電盤の内部に配設された既設の分岐開閉器とは別に、分岐回路を増設するために増設用の分岐開閉器を主幹開閉器に接続する分電盤の分岐回路増設構造に関するものである。
【０００２】
【従来の技術】
近年、一般家庭において２００Ｖの家電製品が普及してきており、高出力を必要とする温水器や調理器具などの用途にもガスに代わって電気温水器やＩＨクッキングヒータなどの２００Ｖ家電が使用されている。
【０００３】
このような２００Ｖ家電を使用するには、住宅内の分電盤に２００Ｖ負荷用の分岐開閉器を設置する必要があり、住宅を新築する場合は、予め２００Ｖ負荷用の分岐開閉器を分電盤内の分岐開閉器配設位置に配設しておくことで、２００Ｖ負荷に対応することができる。また、既設の住宅にあっても、分電盤内の分岐開閉器配設位置に２００Ｖ負荷用の分岐開閉器を配設するスペースがあれば、そのスペースに２００Ｖ負荷用の分岐開閉器を増設して、２００Ｖ負荷に給電することが可能である。
【０００４】
しかしながら、既設の住宅では、分電盤内部の分岐開閉器配設位置に分岐開閉器を増設するスペースが無い場合が多く、２００Ｖ負荷用の分岐開閉器を増設する場合は、主幹開閉器の一次側又は二次側の電圧線（Ｌ１相，Ｌ２相）用の端子に、２本の分岐配線を介して、分電盤内の空きスペース或いは分電盤の外部に配設された分岐開閉器を接続し、この分岐開閉器を２００Ｖ負荷用として用いていた。
【０００５】
また、１００Ｖ負荷用の分岐開閉器を増設する場合でも、分電盤内の分岐開閉器配設位置に増設用の分岐開閉器を配設するスペースが無い場合は、主幹開閉器の一次側又は二次側の端子の内、何れか一方の電圧線（Ｌ１相又はＬ２相）が接続される端子と中性線（Ｎ相）が接続される端子とに、２本の分岐配線を介して、分電盤内の空きスペースに配設された１００Ｖ負荷用の分岐開閉器を接続し、１００Ｖ負荷に電源を供給していた（例えば特開平１０−１０８３１８号公報参照）。
【０００６】
【発明が解決しようとする課題】
ところで、分岐開閉器を増設する際に、１００Ｖ負荷用の分岐開閉器と２００Ｖ負荷用の分岐開閉器とを混在させた場合は、以下に述べるような問題がある。
【０００７】
主幹開閉器の一次側に１００Ｖ負荷用の分岐開閉器を増設する場合は、主幹開閉器の一次側の端子の内、何れか一方の電圧線（Ｌ１相又はＬ２相）用の端子と、中性線（Ｎ相）用の端子のみに分岐配線を接続し、この分岐配線を介して増設用の分岐開閉器を接続するので、増設した全ての分岐開閉器は一方の電圧線と中性線との間に接続されることになる。したがって、主幹開閉器が中性線欠相保護機能を備えていれば、中性線欠相が発生した場合、主幹開閉器の二次側の分岐回路と増設した分岐回路とは電気的に遮断されるので、増設した分岐回路には電圧が印加されず、全く問題はない。また、主幹開閉器の一次側の電圧線（Ｌ１相，Ｌ２相）用の端子に、分岐配線を介して分岐開閉器を接続し、２００Ｖ負荷に給電した場合、単相３線式配線路の中性線が欠相したとしても、負荷にかかる電圧は２００Ｖのままであり、全く問題はない。
【０００８】
一方、２００Ｖ負荷用の分岐開閉器に加えて、１００Ｖ負荷用の分岐開閉器を増設するために、主幹開閉器の一次側の電圧線（Ｌ１相，Ｌ２相）および中性線（Ｎ相）の３つの端子全てに分岐配線を接続し、Ｌ１相とＬ２相とＮ相の内の２つの相に分岐配線を介して分岐開閉器を接続する場合、作業者が接続を誤って、Ｌ１相とＮ相との間に１００Ｖ負荷用の分岐開閉器を接続するとともに、Ｌ２相とＮ相との間に１００Ｖ負荷用の分岐開閉器を接続してしまう可能性がある。このように接続すると、増設した分岐開閉器は主幹開閉器の一次側に接続されているので、中性線欠相が発生した場合に増設された分岐開閉器に接続されている負荷に過電圧が加わって、負荷が破損する可能性があった。
【０００９】
本発明は上記問題点に鑑みて為されたものであり、その目的とするところは、分岐開閉器を増設する際に１００Ｖ負荷用のものと２００Ｖ負荷用のものとを混在させたとしても、中性線欠相によって負荷に過電圧が印加されることのない分電盤の分岐回路増設構造に関するものである。
【００１０】
【課題を解決するための手段】
上記目的を達成するために、請求項１の発明では、２本の電圧線と中性線との３線で給電する単相３線式配線路に電気的に接続された主幹開閉器の一次側又は二次側の何れかに増設用分岐開閉器を電気的に接続して分岐回路を増設する分電盤の分岐回路増設構造であって、主幹開閉器の一次側又は二次側のうち何れかの側の３つの端子に分岐配線を介してそれぞれ電気的に接続され、互いに異なる高さに配置される３本の導電バーと、複数の増設用分岐開閉器とで構成され、３本の導電バーの内、一方の電圧線に電気的に接続される導電バーを第１の高さ位置に配置するとともに、他方の電圧線に接続される導電バー及び中性線に接続される導電バーを第２及び第３の高さ位置にそれぞれ配置し、各増設用分岐開閉器の器体の一側に、一方の電圧線に電気的に接続される導電バーが差込接続される第１の受刃を、第１の高さ位置に配置するとともに、他方の電圧線に接続される導電バー又は中性線に接続される導電バーのうちの何れか一方に差込接続される第２の受刃を、第２の高さ位置と第３の高さ位置との間で移動自在に配置したことを特徴とする。
【００１２】
【発明の実施の形態】
本発明の一実施形態を図１〜図８を参照して説明する。
【００１３】
図３に示すように、分電盤１０の外殻は合成樹脂成型品であって、前面が開口した箱状のボディ１１と、ボディ１１の開口を開閉自在に塞ぐカバー（図示せず）とで構成される。
【００１４】
ボディ１１の底壁には電線挿通用の窓孔１２が開口しており、窓孔１２の左右両側に設けた支持台（図示せず）に、主幹開閉器２０や複数の分岐開閉器３０を取り付けるための架台１３が取り付けられている。なお、複数の分岐開閉器３０は導電バー（図示せず）を挟んで上下２列に配置されている。
【００１５】
主幹開閉器２０は、器体２１の前面上部に一次側の３個の端子２２ａ〜２２ｃを、前面下部に二次側の３個の端子２３ａ〜２３ｃをそれぞれ配設してあり、一次側の端子２２ａ〜２２ｃには、２本の電圧線と中性線との３線で給電する単相３線式配線路（図示せず）がそれぞれ接続される。ここに、２本の電圧線を区別するために、２本の電圧線の各々をＬ１相、Ｌ２相と言い、中性線をＮ相と言う。そして、２本の電圧線の内、Ｌ１相は図中右側の端子２２ａに、Ｌ２相は左側の端子２２ｂに、中性線（Ｎ相）は中央の端子２２ｃにそれぞれ接続される。
【００１６】
図中上側に並設された複数個の分岐開閉器３０と、下側に並設された複数個の分岐開閉器３０との間には、主幹開閉器２０の二次側の端子２３ａ〜２３ｃにそれぞれ電気的に接続された３本の導電バー（図示せず）が異なる高さ位置に平行に配設されており、各分岐開閉器３０は３本の導電バーの内の２本にそれぞれ電気的に接続されている。
【００１７】
また、主幹開閉器２０の一次側の端子２２ａ〜２２ｃには、３本の分岐配線４９ａ〜４９ｃを介して分岐回路を増設するための分岐開閉器ブロック４０が電気的に接続されている。
【００１８】
分岐開閉器ブロック４０は、２個の増設用分岐開閉器５０ａ，５０ｂと、導電性の良好な金属板から形成された３本の導電バー６１〜６３を保持する端子台６０と、増設用分岐開閉器５０ａ，５０ｂ及び端子台６０が取り付けられるベース４１と、増設用分岐開閉器５０ａ，５０ｂ及び端子台６０を覆うようにしてベース４１に被着されるカバー４５とで構成される。
【００１９】
ベース４１は金属板を折曲することによって、矩形板状の載置片４２の長手方向における一端側の側縁から断面Ｌ形の脚片４３を延設すると共に、長手方向における他端側に一段低くなった段部４２ｂを形成して、段部４２ｂの先端縁から断面Ｌ形の脚片４３を延設してある。各脚片４３には、ねじ挿通孔４３ａが２個ずつ形成されており、ねじ挿通孔４３ａに挿通した固定ねじ（図示せず）を用いて壁面などに固定される。載置片４２の略中央には、並設される２個の増設用分岐開閉器５０ａ，５０ｂの外側面とそれぞれ当接する当接片４２ａ，４２ａが切り起こしによって形成されている。また、載置片４２の長手方向における一端側の側縁からは、ねじ孔４４ａを有する固定片４４が切り起こしによって形成されている。また、載置片４２に設けた段部４２ｂには樹脂製の留め具７２が取り付けられる２個の取付孔４２ｃが左右方向に並べて貫設してある。留め具７２は主部７２ａの裏面に、先端から上方に向かって抜け止めのかえしが突出する係止部７２ｂを突設してあり、この係止部７２ｂを取付孔４２ｃに圧入することで、留め具７２がベース４１に固定される。
【００２０】
カバー４５は絶縁性を有する合成樹脂により下面が開口した箱状に形成され、上面略中央には増設用分岐開閉器５０ａ，５０ｂのハンドル５３を露出させるための窓孔４５ａが貫設されている。また、カバー４５の長手方向に沿う両側面４６には、ベース４１の載置片４２の両側縁とそれぞれ係合する一対のリブ４６ａが内側面に突設されている。また、カバー４５の短幅方向に沿う両側面４７には、下端部の略中央にケーブル導入用のノックアウト部４７ａがそれぞれ形成されている。
【００２１】
端子台６０は、各増設用分岐開閉器５０ａ，５０ｂの一側に設けた差込部５２ａ〜５２ｃに一端部が挿入される３本の導電バー６１〜６３の他端部を合成樹脂成型品の基台６４に挿入保持し、各導電バー６１〜６３の他端部に端子ねじ７０ａ〜７０ｃをそれぞれ螺合させたものである。
【００２２】
導電バー６１は、２個の増設用分岐開閉器５０ａ，５０ｂの下段の差込部５２ａに一端部が挿入される主片６１ａと、主片６１ａの他端部左側縁から連続一体に延設された断面Ｌ形の端子片６１ｂとで構成され、端子片６１ｂには端子ねじ７０ａの螺合するねじ孔６１ｃが形成されている。導電バー６２は、２個の増設用分岐開閉器５０ａ，５０ｂの中段の差込部５２ｂに一端部が挿入される主片６２ａと、主片６２ａの他端部右側縁から連続一体に延設された端子片６２ｂとで構成され、端子片６２ｂには端子ねじ７０ｂの螺合するねじ孔６２ｃが形成されている。また導電バー６３は、２個の増設用分岐開閉器５０ａ，５０ｂの上段の差込部５２ｃに一端部が挿入される主片６３ａと、主片６３ａの他端部略中央から連続一体に延設された断面Ｌ形の端子片６３ｂとで構成され、端子片６３ｂには端子ねじ７０ｃの螺合するねじ孔６３ｃが形成されている。
【００２３】
基台６４は増設用分岐開閉器５０ａ，５０ｂとの対向面が開放された箱状に形成され、その内部は隔壁６５ａ，６５ｂによって上下方向に３つの収納室に分離され、各収納室に導電バー６１〜６３の他端部が挿入保持される。なお、基台６４の内面および隔壁６５ａ，６５ｂの上下面には導電バー６１〜６３を保持するための止め片６７が突設されており、止め片６７に設けた爪６７ａと各導電バー６１〜６３の主片６１ａ〜６３ａに設けた孔６１ｄ〜６３ｄとが係合することで、導電バー６１〜６３の抜けを防止している。
【００２４】
また基台６４における増設用分岐開閉器５０ａ，５０ｂと反対側の端部上面には、各導電バー６１，６２，６３の端子片６１ｂ，６２ｂ，６３ｂをそれぞれ載置する段部６６ａ，６６ｂ，６６ｃが形成されており、導電バー６１，６２，６３の他端部を基台６４の各収納室に挿入すると、各収納室の側壁に設けた挿通孔（図示せず）から端子片６１ｂ，６２ｂ，６３ｂが外側に突出し、段部６６ａ，６６ｂ，６６ｃ上にそれぞれ載置される。ここで、図３及び図４に示すように端子片６３ｂが中央に、端子片６１ｂが端子片６３ｂの左側に、端子片６２ｂが端子片６３ｂの右側にそれぞれ配置されており、各端子片６１ｂ，６２ｂ，６３ｂには、それぞれ、一端が主幹開閉器２０の一次側の電圧極（Ｌ１相、Ｌ２相）および中性極（Ｎ相）の端子２２ａ，２２ｂ，２２ｃに結線された分岐配線４９ａ，４９ｂ，４９ｃの他端が端子ねじ７０ａ，７０ｂ，７０ｃにより電気的且つ機械的に接続されるようになっている。すなわち、３本の導電バー６１，６２，６３の内、下段の導電バー６１はＬ１相、中段の導電バー６２はＬ２相、上段の導電バー６３はＮ相となっている。尚、中央の段部６６ｃは両側の段部６６ａ，６６ｂに比べて一段高くなっており、端子片６１ｂ，６２ｂ，６３ｂの取付高さが異なっているので、絶縁距離を十分に確保でき、また結線作業をやりやすくしている。
【００２５】
また基台６４には、ベース４１の固定片４４に対応する取付片６８が側方に突設され（図５参照）、取付片６８に貫設した挿通孔（図示せず）に取付ねじ６９を通して、固定片４４のねじ孔４４ａに螺合することで基台６４がベース４１に固定される。
【００２６】
次に増設用分岐開閉器５０ａ，５０ｂの構造について説明する。分岐開閉器５０ａ，５０ｂは同様の構造を有しており、その器体５１は、合成樹脂製の第１側ケース５１Ａと第２側ケース５１Ｂとを重ね合わせて結合することで構成され、器体５１の内部には固定接点と、固定接点に接離自在に接触する可動接点とでそれぞれ構成される２組の接点部（図示せず）と、各接点部を開閉させる開閉機構（図示せず）とを収納してあり、ハンドル５３のオンオフ操作によって開閉機構を介して接点部を開閉させる構成となっている。
【００２７】
器体５１の一端内部には、図１又は図２に示すように、異なる高さ位置（図では上下方向）に各々配設された３本の導電バー６１〜６３の内の下段のＬ１相の導電バー６１を差込接続する第１の受刃たる共通端子Ｔ１を収納配置する収納部５４ａと、中段及び上段のＬ２相、Ｎ相の導電バー６２，６３のうちの１本を選択して差込接続する第２の受刃たる選択端子Ｔ２を２本の導電バー６２，６３に対応した少なくとも２つの位置の間で移動自在に配設する内方収納部５４ｂを設けてある。
【００２８】
また器体５１の一端部には、両側ケース５１Ａ，５１Ｂの端壁と側壁にかけて形成したＬ字状の切欠溝を突き合わせることにより端面及び側面が開口した導電バー差込用の差込部５２ａ〜５２ｃを上、中、下の三段に配設された３本の導電バー６１〜６３に対応するように形成しており、上段、中段の差込部５２ａ，５２ｂは内方収納部５４ｂ内に、下段の差込部５２ｃは収納部５４ａ内に連通してある。
【００２９】
共通端子Ｔ１及び選択端子Ｔ２は共に略コ字状で、上下に並行する両側片の先部が互いに近接した後、先端にかけて拡開した刃受ばねから構成され、先端拡開により導電バー６１、６２又は６３の差込を容易とし、中央の近接部位で導電バー６１、６２又は６３を挟み込むようになっている。
【００３０】
内方収納部５４ｂには、残りの２本の導電バー６２，６３に各々対応する２つの位置で選択端子Ｔ２を位置決めする位置決め手段として、第１側ケース５１Ａの内方収納部５４ｂを構成する区画の端部壁面に断面略半円状の突起５５を第１側ケース５１Ａの幅方向に設けてある。
【００３１】
器体５１の内方収納部５４ｂの天井部に当たる壁には、選択端子Ｔ２が２本の導電バー６２，６３の内のどちらに対応する位置にあるのか表示する表示手段として、内方収納部５４ｂ内に連通する通孔５６を設け、この通孔５６から選択端子Ｔ２を収納したスライド部材５７の上部に形成せる円柱状の表示部５７ａが通孔５６に臨んで外部から視認できるか、通孔５６から離れた位置にあって外部から視認できないかにより選択端子Ｔ２の位置を知ることができるようになっている。また通孔５６を介してスライド部材５７を外部から押し操作して下方移動させることも可能としている。この通孔５６は両側ケース５１Ａ、５１Ｂの上面側壁に設けた半円の切欠孔５６ａが突き合わせられて形成される円形の孔からなる。
【００３２】
スライド部材５７は合成樹脂成形品からなり、図７及び図８に示すように、器体５１の両端方向に対応する両端面が開口した枠体状に形成されたもので、選択端子Ｔ２を構成する刃受ばねを一端開口から挿入して、他端開口より刃受ばねの先端部を突出させるようにして保持しており、選択端子Ｔ２はこのスライド部材５７と共に内方収納部５４ｂ内を図１及び図２において上下方向に移動自在に配置される。尚、図７中の７１は選択端子Ｔ２と接点部との間を電気的に接続する編組線である。
【００３３】
内方収納部５４ｂの両側壁を構成する両側ケース５１Ａ，５１Ｂの側壁の内面にはスライド部材５７の両側部に形成したスライド突起５７ｂを上下移動自在に係合してスライドさせる上下方向のガイド溝５８を２条の並行する突起５９間に形成しており、内方収納部５４ｂはこの両側壁のガイド溝５８にスライド部材５７の両側のスライド突起５７ｂを係合した状態でスライド部材５７とともに選択端子Ｔ２を上下方向にスライド移動自在に収納保持している。尚、内方収納部５４ｂ側にスライド突起を、ガイド溝をスライド部材５７側に設けても良い。
【００３４】
スライド部材５７は、第１側ケース５１Ａの側部より図７及び図８に示すように図において下方に延びた脚片５７ｃを一体に延長形成するとともに、脚片５７ｃの下端部には外向きに突出した突出部５７ｄを形成してある。そして、この突出部５７ｄは、内方収納部５４ｂの側壁を構成する第１側ケース５１Ａの側壁の外側に第１側ケース５１Ａの底面から上方向に形成されたスライド溝５１ａの上端底部に内方収納部５４ｂと連通するように開口した挿通孔５１ｃから、スライド溝５１ａ内に挿入されて、脚片５７ｃとともにスライド溝５１ａ内を上下方向にスライド自在に位置される。
【００３５】
ここに、スライド溝５１ａと挿通孔５１ｃとは選択端子Ｔ２を装着したスライド部材５７を上下移動させるためのガイド部を構成しており、スライド溝５１ａの底部は内方収納部５４ｂ内に突出するように形成され、スライド溝５１ａの上端底部に形成された挿通孔５１ｃを介してスライド溝５１ａ内に上方挿入される脚片５７ｃの裏面がスライド溝５１ａの底部に摺接可能なようになっている。またスライド溝５１ａの最上方には突出部５７ｄがスライド溝５１ａの上端部へ移動したときに衝合する突出部５１ｂを設けてある。
【００３６】
而して、突出部５７ｄが内方収納部５４ｂ内の選択端子Ｔ２の上下移動させる操作部を構成し、器体５１外部からこの表示部５７ａを持って或いはドライバ等で押し上げたり、押し下げることによってスライド溝５１ａ内をスライド移動させれば、このスライド移動に伴い内方収納部５４ｂ内のスライド部材５７が選択端子Ｔ２と共にスライド突起５７ｂとガイド溝５８とによるガイドによって上又は下へ移動することになる。また、上記の操作によってスライド部材５７が移動する際、スライド部材５７の先端上部或いは先端下部がその弾性と位置決め突起５５のアール面とにより位置決め突起５５を乗り越え、移動後は位置決め突起５５にスライド部材５７の枠部の先端下部或いは先端上部が当たって、選択端子Ｔ２の位置を保持するようになっている。
【００３７】
ここで、突出部５７ｄがスライド溝５１ａの下端部にある位置が、図２に示すように中段の導電バー６２に選択端子Ｔ２が対応する位置で、突出部５７ｄがスライド溝５１ａの上端部にある位置が、図１に示すように上段の導電バー６１に選択端子Ｔ２が対応する位置となるように、脚片５７ｃの長さ及びガイド部を構成しており、上記突出部５７ｄの操作により選択端子Ｔ２の位置を上段のＮ相の導電バー６３或いは中段のＬ２相の導電バー６２に対応させることができるのである。そして、選択端子Ｔ２の位置を中段のＬ２相の導電バー６２に対応させた場合は、共通端子Ｔ１がＬ１相、選択端子Ｔ２がＬ２相にそれぞれ接続されるので、分岐開閉器には２００Ｖが印加される。また、選択端子Ｔ２の位置を上段のＮ相の導電バー６３に対応させた場合は、共通端子Ｔ１がＬ１相、選択端子Ｔ２がＮ相にそれぞれ接続されるので、分岐開閉器には１００Ｖが印加される。
【００３８】
本実施形態では図４に示すように、一方の増設用分岐開閉器５０ａでは、表示部５７ａが通孔５６に臨んで外部から視認可能となっているので、選択端子Ｔ２が上段の導電バー６３に対応する位置に移動しており、１００Ｖ負荷用として用いられている。また他方の増設用分岐開閉器５０ｂでは、表示部５７ａが外部から視認できないので、選択端子Ｔ２が中段の導電バー６２に対応する位置に移動しており、２００Ｖ負荷用として用いられている。尚、図３では２個の選択端子Ｔ２が図示されているが、２個の選択端子Ｔ２の内、上段の導電バー６３に対応する高さ位置に配置された選択端子Ｔ２が増設用分岐開閉器５０ａの端子であり、中段の導電バー６２に対応する高さ位置に配置された選択端子Ｔ２は増設用分岐開閉器５０ａに並置された増設用分岐開閉器５０ｂの端子を示している。
【００３９】
ところで、共通端子Ｔ１及び選択端子Ｔ２は、２つの接点部の可動接点に電気的に接続されている。また器体５１の他端部には、斜め上向きに開口した一対の電線挿入孔５１ｅが並行形成されており、各電線挿入孔５１ｅから挿入された電線は器体５１内に収納された速結端子構造の接続端子（図示せず）に接続され、接続端子を介して２つの接点部の固定接点に電気的に接続されている。
【００４０】
而して各電線挿入孔５１ｅに夫々負荷側の電線を挿入して各接続端子に接続し、導電バー６１を差込部５２ａを介して共通端子Ｔ１に差込接続し、導電バー６２又は６３を差込部５２ｂ又は５２ｃを介して選択端子Ｔ２に差込接続すれば主幹開閉器２０の一次側から分岐した電路に増設用分岐開閉器５０ａ，５０ｂを挿入することができるようになっている。
【００４１】
この分岐開閉器ブロック４０を組み立てる際には、一対の留め具７２をベース４１の載置片４２に設けた取付孔４２ｃにそれぞれ圧入して、固定した後、載置片４２における両当接片４２ａ，４２ａの間の部位に２個の増設用分岐開閉器５０ａ，５０ｂを並べて配置し、留め具７２に設けた係止片７２ｃを器体５１の一側面に設けた係止溝５１ｄに挿入して、器体５１の一側を固定する。次に、基台６４の各収納室に導電バー６１〜６３を挿入して保持させた状態で、導電バー６１〜６３の一端部を増設用分岐開閉器５０ａ，５０ｂの差込部５２ａ〜５２ｃに挿入して、各増設用分岐開閉器５０ａ，５０ｂの共通端子Ｔ１及び選択端子Ｔ２を対応する導電バー６１〜６３に差込接続した後、取付ねじ６９を基台６４の取付片６８に設けた挿通孔に通して、ベース４１の固定片４４に設けたねじ孔４４ａに螺合することにより、端子台６０と２個の増設用分岐開閉器５０ａ，５０ｂとがベース４１に固定される。そして、ベース４１の上側から、端子台６０と２個の増設用分岐開閉器５０ａ，５０ｂとを覆うようにしてカバー４５を被せると、カバー４５の両側面４６の弾性によってリブ４６ａがベース４１の載置片４２を乗り越え、載置片４２の端縁と係合することで、カバー４５とベース４１とが結合され、組立作業が完了する。
【００４２】
上述のように構成された分岐開閉器ブロック４０では、各導電バー６１〜６３の端子片６１ｂ〜６３ｂに、一端が主幹開閉器２０の一次側の電圧極（Ｌ１相、Ｌ２相）および中性極（Ｎ相）の端子２２ａ〜２２ｃに結線された分岐配線４９ａ〜４９ｃの他端を端子ねじ７０ａ〜７０ｃにより電気的且つ機械的に接続しており、３本の導電バー６１〜６３の内、下段の導電バー６１はＬ１相、中段の導電バー６２はＬ２相、上段の導電バー６３はＮ相となっている。そして、一方の増設用分岐開閉器５０ａは、選択端子Ｔ２が上段の導電バー６３に対応する位置に移動しているので、共通端子Ｔ１及び選択端子Ｔ２にそれぞれ導電バー６１，６３が差込接続され、１００Ｖ負荷用として用いられる。また他方の増設用分岐開閉器５０ｂは、選択端子Ｔ２が中段の導電バー６２に対応する位置に移動しているので、共通端子Ｔ１及び選択端子Ｔ２にそれぞれ導電バー６１，６２が差込接続され、２００Ｖ負荷用として用いられる。
【００４３】
本実施形態の分岐開閉器ブロック４０は、１００Ｖ負荷用の分岐開閉器と２００Ｖ負荷用の分岐開閉器とを混在させて増設しているが、各増設用分岐開閉器５０ａ，５０ｂの共通端子Ｔ１はＬ１相の導電バー６１に対応する高さ位置に配置され、選択端子Ｔ２はＬ２相の導電バー６２に対応する高さ位置とＮ相の導電バー６３に対応する高さ位置との間で移動自在となっているので、一方の端子（共通端子Ｔ１）は必ずＬ１相の導電バー６１に接続され、他方の端子（選択端子Ｔ２）はＬ２相又はＮ相の導電バー６２，６３の何れかに接続されることになる。
【００４４】
したがって、増設用分岐開閉器５０ａ，５０ｂを１００Ｖ負荷用として用いる場合は、両端子Ｔ１，Ｔ２がＬ１相とＮ相に接続されることになり、増設用分岐開閉器５０ａ，５０ｂに接続される負荷はＬ１相とＮ相との間のみに接続され、Ｌ２相とＮ相との間には接続されないから、中性線欠相が発生して主幹開閉器２０の保護機能が作動した場合（主幹開閉器２０の一次側と二次側との間が遮断された場合）は増設用分岐開閉器５０ａ，５０ｂに接続される負荷に電圧が印加されなくなり、過電圧が加わることはないので負荷の破損を防止できる。
【００４５】
また、選択端子Ｔ２は第２の高さ位置と第３の高さ位置との間で移動自在となっているので、選択端子Ｔ２を移動させることで、Ｌ２相及びＮ相の導電バー６２，６３のうちの１本に選択的に接続できるから、１つの増設用分岐開閉器５０ａ，５０ｂを１００Ｖ負荷用又は２００Ｖ負荷用として用いることができ、したがって１００Ｖ負荷用のものと２００Ｖ負荷用のものを別々に製造する必要がないので、増設用分岐開閉器の種類を少なくして、量産効果によるコストダウンが図れる。
【００４６】
尚、本実施形態では、２個の増設用分岐開閉器５０ａ，５０ｂの内、一方の増設用分岐開閉器５０ａを１００Ｖ負荷用、他方の増設用分岐開閉器５０ｂを２００Ｖ負荷用として用いているが、両方の増設用分岐開閉器５０ａ，５０ｂの選択端子Ｔ２を上段の導電バー６３に対応する位置に移動させて、１００Ｖ負荷用として用いても良い。この場合、２個の増設用分岐開閉器５０ａ，５０ｂは共に１００Ｖ負荷用であるが、両方ともＬ１相とＮ相に接続されているので、上述のように中性線欠相が発生して主幹開閉器２０の保護機能が作動すると、２個の増設用分岐開閉器５０ａ，５０ｂには電圧が印加されなくなるから、増設用分岐開閉器５０ａ，５０ｂに接続された負荷に過電圧が加わることはなく、負荷の破損を防止できる。また、増設用分岐開閉器の個数が２個の場合を例に説明しているが、増設用分岐開閉器の個数を２個に限定する趣旨のものではなく、３個以上としても良い。
【００４７】
また、本実施形態では主幹開閉器２０の一次側から分岐配線４９ａ〜４９ｃを介して増設用分岐開閉器５０ａ，５０ｂに給電しているが、主幹開閉器２０の二次側から分岐配線４９ａ〜４９ｃを介して増設用分岐開閉器５０ａ，５０ｂに給電するようにしても良い。
【００４８】
【発明の効果】
上述のように、請求項１の発明は、２本の電圧線と中性線との３線で給電する単相３線式配線路に電気的に接続された主幹開閉器の一次側又は二次側の何れかに増設用分岐開閉器を電気的に接続して分岐回路を増設する分電盤の分岐回路増設構造であって、主幹開閉器の一次側又は二次側のうち何れかの側の３つの端子に分岐配線を介してそれぞれ電気的に接続され、互いに異なる高さに配置される３本の導電バーと、複数の増設用分岐開閉器とで構成され、３本の導電バーの内、一方の電圧線に電気的に接続される導電バーを第１の高さ位置に配置するとともに、他方の電圧線に接続される導電バー及び中性線に接続される導電バーを第２及び第３の高さ位置にそれぞれ配置し、各増設用分岐開閉器の器体の一側に、一方の電圧線に電気的に接続される導電バーが差込接続される第１の受刃を、第１の高さ位置に配置するとともに、他方の電圧線に接続される導電バー又は中性線に接続される導電バーのうちの何れか一方に差込接続される第２の受刃を、第２の高さ位置と第３の高さ位置との間で移動自在に配置したことを特徴とし、第１の受刃を第１の高さ位置に配置するとともに、第２の受刃を第２の高さ位置と第３の高さ位置との間で移動自在に配置しているので、第２の受刃を他方の電圧線に対応する高さ位置に配置した場合は２００Ｖ負荷用として、第２の受刃を中性線に対応する高さ位置に配置した場合は１００Ｖ負荷用として用いることができる。しかも、第１の受刃を一方の電圧相に対応する高さ位置に固定しているので、複数の増設用分岐開閉器を１００Ｖ負荷用として用いたとしても、全ての増設用分岐開閉器は一方の電圧線と中性線とに接続され、他方の電圧線に接続されることはないから、増設用分岐開閉器を介して給電される負荷は一方の電圧線と中性線との間のみに接続されることになり、したがって中性線欠相が発生した場合は、増設用分岐開閉器を介して接続された負荷に電圧が印加されなくなるので、中性線欠相によって負荷に過電圧が加わって、負荷が破損するのを防止できるという効果がある。
【００４９】
さらに、第２の受刃を移動させることで、第２の受刃を残りの２本の導電バーのうちの１本に選択的に接続できるから、１つの増設用分岐開閉器を１００Ｖ負荷用又は２００Ｖ負荷用として用いることができ、したがって１００Ｖ負荷用のものと２００Ｖ負荷用のものを別々に製造する必要がないので、増設用分岐開閉器の種類を少なくして、量産効果によるコストダウンが図れるという効果がある。
【図面の簡単な説明】
【図１】本実施形態に用いる増設用分岐開閉器を１００Ｖ用として使用する状態を示し、（ａ）は第１側ケースの一部省略せる一側面図、（ｂ）は第１側ケースの一部省略せる他側面図である。
【図２】同上の増設用分岐開閉器を２００Ｖ用として使用する状態を示し、（ａ）は第１側ケースの一部省略せる一側面図、（ｂ）は第１側ケースの一部省略せる他側面図である。
【図３】同上の全体構成を説明する説明図である。
【図４】同上の増設ブロックの分解斜視図である。
【図５】同上の増設ブロックのカバーを外した状態の側面図である。
【図６】同上の増設ブロックの外観斜視図である。
【図７】同上の増設用分岐開閉器に用いるスライド部材と選択端子との関係を示す分解斜視図である。
【図８】同上のスライド部材と、第１側ケース及び第２側ケースとの関係を示す一部省略せる分解斜視図である。
【符号の説明】
５１器体
Ｔ１共通端子
Ｔ２選択端子[0001]
BACKGROUND OF THE INVENTION
In addition to the existing branch switch provided inside the distribution board, the present invention adds a branch circuit for the distribution board to connect the extension branch switch to the main switch in order to add a branch circuit. Concerning structure.
[0002]
[Prior art]
In recent years, 200V home appliances have become widespread in ordinary households, and 200V home appliances such as electric water heaters and IH cooking heaters are used in place of gas in applications such as water heaters and cooking utensils that require high output. .
[0003]
In order to use such 200V home appliances, it is necessary to install a branch switch for 200V load on the distribution board in the house, and when building a new house, the branch switch for 200V load is distributed in advance. By arranging it at the branch switch arrangement position in the panel, it is possible to cope with 200V load. In addition, even in existing houses, if there is a space to install a branch switch for 200V load at the branch switch installation position in the distribution board, a branch switch for 200V load will be added to that space. Thus, it is possible to supply power to a 200V load.
[0004]
However, in existing houses, there is often no space for adding a branch switch at the position where the branch switch is installed in the distribution board. When a branch switch for a 200V load is added, the primary switch is the primary switch. Branch switch installed on the terminal for the voltage line (L1 phase, L2 phase) on the side or secondary side, via two branch wirings, in an empty space in the distribution board or outside the distribution board This branch switch was used for a 200V load.
[0005]
Even when a branch switch for 100V load is added, if there is no space for installing the additional branch switch at the branch switch installation position in the distribution board, the primary side of the main switch or Among the terminals on the secondary side, one of the voltage lines (L1 phase or L2 phase) is connected to the terminal to which the neutral line (N phase) is connected via two branch wires. A branch switch for 100V load disposed in an empty space in the distribution board is connected to supply power to the 100V load (see, for example, Japanese Patent Laid-Open No. 10-108318).
[0006]
[Problems to be solved by the invention]
By the way, when adding branch switches, if a branch switch for 100V load and a branch switch for 200V load are mixed, there are problems as described below.
[0007]
When adding a branch switch for a 100V load on the primary side of the main switch, one of the terminals on the primary side of the main switch is used for the voltage line (L1 phase or L2 phase), Since branch wiring is connected only to the terminal for the neutral wire (N-phase), and the additional branch switch is connected via this branch wiring, all the additional branch switches are connected to one voltage line and neutral line. Will be connected between. Therefore, if the trunk switch has a neutral wire phase loss protection function, when a neutral wire phase failure occurs, the secondary branch circuit of the trunk switch is electrically disconnected from the added branch circuit. Therefore, no voltage is applied to the added branch circuit, and there is no problem at all. In addition, when a branch switch is connected to the primary voltage line (L1 phase, L2 phase) terminal of the main switch via a branch line and power is supplied to a 200 V load, the single-phase three-wire wiring path Even if the neutral wire is out of phase, the voltage applied to the load remains at 200 V, and there is no problem at all.
[0008]
On the other hand, in order to add a branch switch for a 100V load in addition to a branch switch for a 200V load, primary voltage lines (L1 phase, L2 phase) and a neutral line (N phase) for the main switch When branch wiring is connected to all three terminals, and a branch switch is connected to two of the L1, L2, and N phases via the branch wiring, the operator incorrectly connects the L1 phase. There is a possibility that a branch switch for 100 V load is connected between the N phase and the N phase, and a branch switch for 100 V load is connected between the L2 phase and the N phase. When connected in this way, the added branch switch is connected to the primary side of the main switch, so if a neutral wire phase failure occurs, an overvoltage is applied to the load connected to the added branch switch. In addition, the load could be damaged.
[0009]
The present invention has been made in view of the above problems, and the purpose of the present invention is that even when a switch for a 100V load and a load for a 200V load are mixed when adding a branch switch, The present invention relates to a branch circuit extension structure of a distribution board in which an overvoltage is not applied to a load due to a phase failure of a neutral wire.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, in the first aspect of the present invention, a primary switch primary connected to a single-phase three-wire wiring line that is fed by three wires of two voltage lines and a neutral wire. A branch circuit expansion structure of a distribution board in which an extension branch switch is electrically connected to either the secondary side or the secondary side to increase the branch circuit, and is either the primary side or the secondary side of the main switch It is composed of three conductive bars that are electrically connected to three terminals on either side via branch wires and arranged at different heights, and a plurality of branch switches for expansion. A conductive bar electrically connected to one of the voltage lines is disposed at the first height position, and Connected to conductive bar and neutral wire connected to the other voltage line Conductive bars are arranged at the second and third height positions, respectively, and a conductive bar electrically connected to one voltage line is plugged into one side of the body of each additional branch switch. While arranging the first receiving blade at the first height position, Of the conductive bar connected to the other voltage line or the conductive bar connected to the neutral line The second receiving blade that is plugged and connected to either one is arranged to be movable between the second height position and the third height position.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
[0013]
As shown in FIG. 3, the outer shell of the distribution board 10 is a synthetic resin molded product, and a box-shaped body 11 having an open front surface, and a cover (not shown) that covers the opening of the body 11 so as to be freely opened and closed. Consists of.
[0014]
A window hole 12 for inserting an electric wire is opened in the bottom wall of the body 11, and the main switch 20 and a plurality of branch switches 30 are mounted on support bases (not shown) provided on the left and right sides of the window hole 12. A mount 13 for attachment is attached. Note that the plurality of branch switches 30 are arranged in two upper and lower rows across a conductive bar (not shown).
[0015]
The main switch 20 is provided with three primary terminals 22a to 22c at the front upper part of the body 21 and three secondary terminals 23a to 23c at the lower front part. A single-phase three-wire wiring path (not shown) that feeds power through three lines of two voltage lines and a neutral line is connected to each of the terminals 22a to 22c. Here, in order to distinguish the two voltage lines, the two voltage lines are referred to as the L1 phase and the L2 phase, respectively, and the neutral line is referred to as the N phase. Of the two voltage lines, the L1 phase is connected to the right terminal 22a, the L2 phase is connected to the left terminal 22b, and the neutral line (N phase) is connected to the center terminal 22c.
[0016]
Between the plurality of branch switches 30 arranged side by side in the figure and the plurality of branch switches 30 arranged side by side on the lower side, terminals 23a to 23c on the secondary side of the main switch 20 are provided. Three electrically conductive bars (not shown) electrically connected to each other are arranged in parallel at different height positions, and each branch switch 30 is connected to each of two of the three electrically conductive bars. Electrically connected.
[0017]
A branch switch block 40 for adding a branch circuit is electrically connected to the primary side terminals 22a to 22c of the main switch 20 via three branch wires 49a to 49c.
[0018]
The branch switch block 40 includes two extension branch switches 50a and 50b, a terminal block 60 that holds three conductive bars 61 to 63 formed of a metal plate having good conductivity, and an extension branch. It comprises a base 41 to which the switches 50a and 50b and the terminal block 60 are attached, and a cover 45 which is attached to the base 41 so as to cover the extension branch switches 50a and 50b and the terminal block 60.
[0019]
The base 41 is formed by bending a metal plate to extend a leg piece 43 having an L-shaped cross section from the side edge on one end side in the longitudinal direction of the rectangular plate-like mounting piece 42 and on the other end side in the longitudinal direction. A step portion 42b that is lowered by one step is formed, and a leg piece 43 having an L-shaped cross section is extended from the leading edge of the step portion 42b. Each leg piece 43 is formed with two screw insertion holes 43a, and is fixed to a wall surface or the like using a fixing screw (not shown) inserted into the screw insertion hole 43a. At approximately the center of the mounting piece 42, contact pieces 42a and 42a that respectively contact the outer surfaces of the two additional branch switches 50a and 50b provided side by side are formed by cutting and raising. Further, a fixing piece 44 having a screw hole 44a is formed by cutting and raising from a side edge on one end side in the longitudinal direction of the mounting piece 42. In addition, two mounting holes 42c to which resin-made fasteners 72 are attached are arranged side by side in the left-right direction in the step portion 42b provided in the mounting piece 42. The fastener 72 is provided with a locking portion 72b protruding from the tip toward the upper side on the back surface of the main portion 72a, and by pressing the locking portion 72b into the mounting hole 42c, A fastener 72 is fixed to the base 41.
[0020]
The cover 45 is formed in a box-like shape with an opening on the lower surface made of an insulating synthetic resin, and a window hole 45a for exposing the handle 53 of the extension branch switches 50a and 50b is provided through substantially the center of the upper surface. . In addition, a pair of ribs 46 a that engage with both side edges of the mounting piece 42 of the base 41 are provided on both side surfaces 46 along the longitudinal direction of the cover 45. Further, on both side surfaces 47 along the short width direction of the cover 45, a knockout portion 47a for introducing a cable is formed in the approximate center of the lower end portion.
[0021]
The terminal block 60 is a synthetic resin molded product in which the other end portions of the three conductive bars 61 to 63 are inserted into the insertion portions 52a to 52c provided on one side of the branch switches 50a and 50b for expansion. The terminal screws 70a to 70c are screwed into the other ends of the conductive bars 61 to 63, respectively.
[0022]
The conductive bar 61 extends continuously and integrally from the main piece 61a, one end of which is inserted into the lower insertion portion 52a of the two additional branch switches 50a, 50b, and the left edge of the other end of the main piece 61a. The terminal piece 61b is formed with a screw hole 61c into which the terminal screw 70a is screwed. The conductive bar 62 extends continuously and integrally from the main piece 62a, one end of which is inserted into the middle insertion portion 52b of the two additional branch switches 50a, 50b, and the right edge of the other end of the main piece 62a. The terminal piece 62b is formed with a screw hole 62c into which the terminal screw 70b is screwed. The conductive bar 63 extends continuously and integrally from the main piece 63a, one end of which is inserted into the upper insertion portion 52c of the two additional branch switches 50a, 50b, and the other end of the main piece 63a. The terminal piece 63b is provided with a screw hole 63c into which the terminal screw 70c is screwed.
[0023]
The base 64 is formed in a box shape in which the surface facing the extension branch switches 50a and 50b is opened, and the inside is separated into three storage chambers in the vertical direction by the partition walls 65a and 65b, and is electrically connected to each storage chamber. The other ends of the bars 61 to 63 are inserted and held. Stop pieces 67 for holding the conductive bars 61 to 63 protrude from the inner surface of the base 64 and the upper and lower surfaces of the partition walls 65a and 65b. The claws 67a provided on the stop pieces 67 and the respective conductive bars 61 are provided. The holes 61d to 63d provided in the main pieces 61a to 63a of the? 63 are engaged with each other, thereby preventing the conductive bars 61 to 63 from coming off.
[0024]
Further, on the upper surface of the end portion of the base 64 opposite to the extension branch switches 50a, 50b, step portions 66a, 66b, on which the terminal pieces 61b, 62b, 63b of the respective conductive bars 61, 62, 63 are placed, respectively. 66c is formed, and when the other ends of the conductive bars 61, 62, 63 are inserted into the storage chambers of the base 64, the terminal pieces 61b, 61b are inserted through insertion holes (not shown) provided in the side walls of the storage chambers. 62b and 63b protrude outward and are placed on the step portions 66a, 66b and 66c, respectively. Here, as shown in FIGS. 3 and 4, the terminal piece 63b is arranged in the center, the terminal piece 61b is arranged on the left side of the terminal piece 63b, and the terminal piece 62b is arranged on the right side of the terminal piece 63b. , 62b, 63b, branch wiring 49a having one end connected to terminals 22a, 22b, 22c of the primary voltage pole (L1 phase, L2 phase) and neutral pole (N phase) of the main switch 20 respectively. 49b, 49c are electrically and mechanically connected by terminal screws 70a, 70b, 70c. That is, of the three conductive bars 61, 62, 63, the lower conductive bar 61 is in the L1 phase, the middle conductive bar 62 is in the L2 phase, and the upper conductive bar 63 is in the N phase. The central step 66c is one step higher than the steps 66a and 66b on both sides, and the mounting heights of the terminal pieces 61b, 62b and 63b are different, so that a sufficient insulation distance can be secured. It makes it easy to do the wiring work.
[0025]
Further, a mounting piece 68 corresponding to the fixed piece 44 of the base 41 protrudes laterally from the base 64 (see FIG. 5), and a mounting screw 69 is inserted into an insertion hole (not shown) penetrating the mounting piece 68. Then, the base 64 is fixed to the base 41 by being screwed into the screw hole 44 a of the fixing piece 44.
[0026]
Next, the structure of the extension branch switches 50a and 50b will be described. The branch switches 50a and 50b have the same structure, and the container body 51 is configured by overlapping and connecting a first side case 51A and a second side case 51B made of synthetic resin. Inside the body 51, there are two sets of contact portions (not shown) each comprising a fixed contact and a movable contact that comes in contact with and away from the fixed contact, and an open / close mechanism (not shown) for opening and closing each contact portion. And the contact portion is opened / closed via an opening / closing mechanism by an on / off operation of the handle 53.
[0027]
As shown in FIG. 1 or 2, the lower end L1 phase of the three conductive bars 61 to 63 disposed at different height positions (in the vertical direction in the drawing) is disposed inside one end of the vessel 51. Select one of the storage portion 54a for storing and arranging the common terminal T1 serving as the first receiving blade for inserting and connecting the conductive bar 61, and the middle and upper L2 phase and N phase conductive bars 62 and 63. An inner storage portion 54b is provided in which a selection terminal T2 serving as a second receiving blade to be plugged in is movably disposed between at least two positions corresponding to the two conductive bars 62 and 63.
[0028]
Also, at one end portion of the container body 51, an insertion portion 52a for inserting a conductive bar whose end surface and side surfaces are opened by abutting L-shaped notch grooves formed between the end walls and the side walls of both side cases 51A, 51B. To 52c are formed so as to correspond to the three conductive bars 61 to 63 arranged in the upper, middle, and lower three stages, and the upper and middle insertion parts 52a and 52b are the inner storage parts 54b. The lower insertion portion 52c communicates with the storage portion 54a.
[0029]
The common terminal T1 and the selection terminal T2 are both substantially U-shaped, and are configured by blade receiving springs that expand toward the tip after the tips of both side-by-side pieces that are parallel to each other are close to each other. The insertion of 62 or 63 is facilitated, and the conductive bar 61, 62 or 63 is sandwiched at the central proximity.
[0030]
The inner storage portion 54b constitutes the inner storage portion 54b of the first side case 51A as positioning means for positioning the selection terminal T2 at two positions respectively corresponding to the remaining two conductive bars 62 and 63. A protrusion 55 having a substantially semicircular cross section is provided on the end wall surface of the partition in the width direction of the first side case 51A.
[0031]
As a display means for displaying which of the two conductive bars 62 and 63 is located on the wall corresponding to the ceiling of the inner storage portion 54b of the container 51, the inner storage portion A through hole 56 communicating with the inside of 54 b is provided, and a columnar display portion 57 a formed on the upper portion of the slide member 57 accommodating the selection terminal T <b> 2 from the through hole 56 faces the through hole 56 and is visible from the outside. The position of the selection terminal T2 can be known depending on whether it is located away from the hole 56 and cannot be visually recognized from the outside. Further, the slide member 57 can be pushed downward from the outside through the through hole 56 to be moved downward. The through hole 56 is a circular hole formed by abutting a semicircular cutout hole 56a provided on the side walls of the upper and lower cases 51A and 51B.
[0032]
As shown in FIGS. 7 and 8, the slide member 57 is formed of a synthetic resin molded product and is formed in a frame shape with both end faces corresponding to the both end directions of the container body 51, and constitutes the selection terminal T2. The blade receiving spring is inserted from one end opening and held so that the tip of the blade receiving spring protrudes from the other end opening. The selection terminal T2 together with the slide member 57 is shown inside the inner storage portion 54b. In FIG. 1 and FIG. 2, it is arranged so as to be movable in the vertical direction. Note that reference numeral 71 in FIG. 7 denotes a braided wire that electrically connects the selection terminal T2 and the contact portion.
[0033]
A guide groove in the vertical direction in which slide projections 57b formed on both sides of the slide member 57 are slidably engaged and slid on the inner surfaces of the side walls of both side cases 51A and 51B constituting both side walls of the inner storage portion 54b. 58 is formed between two parallel protrusions 59, and the inner storage portion 54b is selected together with the slide member 57 in a state where the slide protrusions 57b on both sides of the slide member 57 are engaged with the guide grooves 58 on both side walls. The terminal T2 is stored and held so as to be slidable in the vertical direction. A slide protrusion may be provided on the inner storage portion 54b side, and a guide groove may be provided on the slide member 57 side.
[0034]
As shown in FIGS. 7 and 8, the slide member 57 is integrally formed with a leg piece 57c extending downward from the side of the first side case 51A, and outwardly at the lower end of the leg piece 57c. A projecting portion 57d projecting is formed. The projecting portion 57d is formed on the bottom of the upper end of the slide groove 51a formed upward from the bottom surface of the first side case 51A outside the side wall of the first side case 51A constituting the side wall of the inner storage portion 54b. It is inserted into the slide groove 51a from the insertion hole 51c opened so as to communicate with the side storage portion 54b, and is slidable in the slide groove 51a together with the leg piece 57c in the vertical direction.
[0035]
Here, the slide groove 51a and the insertion hole 51c constitute a guide part for vertically moving the slide member 57 to which the selection terminal T2 is attached, and the bottom part of the slide groove 51a projects into the inner storage part 54b. The back surface of the leg piece 57c inserted upward into the slide groove 51a through the insertion hole 51c formed in the upper end bottom portion of the slide groove 51a can be brought into sliding contact with the bottom portion of the slide groove 51a. Yes. In addition, a protrusion 51b that abuts when the protrusion 57d moves to the upper end of the slide groove 51a is provided on the uppermost side of the slide groove 51a.
[0036]
Thus, the projecting portion 57d constitutes an operation portion for moving the selection terminal T2 in the inner storage portion 54b up and down, and the display portion 57a is held from the outside of the body 51 or pushed up or down by a driver or the like. If the slide movement in the slide groove 51a is made, the slide member 57 in the inner storage portion 54b is moved up or down by the guide by the slide protrusion 57b and the guide groove 58 together with the selection terminal T2 along with the slide movement. Become. Further, when the slide member 57 is moved by the above operation, the upper end or the lower end of the slide member 57 gets over the positioning projection 55 by its elasticity and the rounded surface of the positioning projection 55, and after the movement, the slide member 57 moves to the positioning projection 55 The lower end or the upper end of the frame portion 57 hits to hold the position of the selection terminal T2.
[0037]
Here, the position where the protrusion 57d is at the lower end of the slide groove 51a is the position where the selection terminal T2 corresponds to the middle conductive bar 62 as shown in FIG. 2, and the protrusion 57d is at the upper end of the slide groove 51a. As shown in FIG. 1, the length of the leg piece 57c and the guide portion are configured so that the selection terminal T2 corresponds to the upper conductive bar 61 as shown in FIG. The position of the selection terminal T2 can correspond to the upper N-phase conductive bar 63 or the middle L2-phase conductive bar 62. When the position of the selection terminal T2 is made to correspond to the middle L2 phase conductive bar 62, the common terminal T1 is connected to the L1 phase, and the selection terminal T2 is connected to the L2 phase. Applied. Further, when the position of the selection terminal T2 is made to correspond to the upper N-phase conductive bar 63, the common terminal T1 is connected to the L1 phase and the selection terminal T2 is connected to the N phase, so that the branch switch has 100V. Applied.
[0038]
In the present embodiment, as shown in FIG. 4, in one extension branch switch 50 a, the display portion 57 a faces the through hole 56 and is visible from the outside, so that the selection terminal T <b> 2 is the upper conductive bar 63. Is used for 100V load. Further, in the other extension branch switch 50b, since the display unit 57a cannot be visually recognized from the outside, the selection terminal T2 is moved to a position corresponding to the middle conductive bar 62 and is used for a 200V load. In FIG. 3, two selection terminals T2 are shown. Of the two selection terminals T2, the selection terminal T2 arranged at a height position corresponding to the upper conductive bar 63 is connected to an extension branch opening / closing. The selection terminal T2 which is a terminal of the device 50a and is arranged at a height corresponding to the middle conductive bar 62 indicates a terminal of the extension branch switch 50b juxtaposed to the extension branch switch 50a.
[0039]
By the way, the common terminal T1 and the selection terminal T2 are electrically connected to the movable contacts of the two contact portions. In addition, a pair of wire insertion holes 51e opened obliquely upward are formed in parallel at the other end portion of the vessel body 51, and the wires inserted from the wire insertion holes 51e are fast-coupled stored in the vessel body 51. It is connected to a connection terminal (not shown) having a terminal structure, and is electrically connected to the fixed contacts of the two contact portions via the connection terminals.
[0040]
Thus, a load-side electric wire is inserted into each electric wire insertion hole 51e and connected to each connection terminal, and the conductive bar 61 is inserted and connected to the common terminal T1 via the insertion portion 52a. Are inserted and connected to the selection terminal T2 via the insertion portion 52b or 52c, the extension branch switches 50a and 50b can be inserted into the electric circuit branched from the primary side of the main switch 20. .
[0041]
When assembling the branch switch block 40, the pair of fasteners 72 are respectively press-fitted into the mounting holes 42 c provided in the mounting piece 42 of the base 41 and fixed, and then both contact pieces on the mounting piece 42. Two extension branch switches 50a and 50b are arranged side by side in a region between 42a and 42a, and a locking piece 72c provided on the fastener 72 is inserted into a locking groove 51d provided on one side of the body 51. Then, one side of the container body 51 is fixed. Next, in a state where the conductive bars 61 to 63 are inserted and held in the respective storage chambers of the base 64, the one end portions of the conductive bars 61 to 63 are inserted into the insertion portions 52a to 52c of the extension branch switches 50a and 50b. After inserting and connecting the common terminal T1 and selection terminal T2 of each extension branch switch 50a, 50b to the corresponding conductive bar 61-63, the mounting screw 69 is provided on the mounting piece 68 of the base 64 The terminal block 60 and the two additional branch switches 50 a and 50 b are fixed to the base 41 by being screwed into the screw holes 44 a provided in the fixing piece 44 of the base 41 through the insertion holes. When the cover 45 is covered from the upper side of the base 41 so as to cover the terminal block 60 and the two additional branch switches 50a and 50b, the ribs 46a are formed on the base 41 by the elasticity of both side surfaces 46 of the cover 45. By overcoming the mounting piece 42 and engaging with the end edge of the mounting piece 42, the cover 45 and the base 41 are coupled, and the assembly work is completed.
[0042]
In the branch switch block 40 configured as described above, the terminal pieces 61b to 63b of the respective conductive bars 61 to 63 have one end at the primary side voltage pole (L1 phase, L2 phase) and neutrality of the main switch 20. The other ends of the branch wirings 49a to 49c connected to the pole (N-phase) terminals 22a to 22c are electrically and mechanically connected by terminal screws 70a to 70c. The lower conductive bar 61 is in the L1 phase, the middle conductive bar 62 is in the L2 phase, and the upper conductive bar 63 is in the N phase. In one branching switch 50a for extension, the selection terminal T2 is moved to a position corresponding to the upper conductive bar 63, so that the conductive bars 61 and 63 are connected to the common terminal T1 and the selection terminal T2, respectively. And used for 100V load. In the other extension branch switch 50b, since the selection terminal T2 is moved to a position corresponding to the middle conductive bar 62, the conductive bars 61 and 62 are inserted and connected to the common terminal T1 and the selection terminal T2, respectively. Used for 200V load.
[0043]
The branch switch block 40 of this embodiment is expanded by mixing a branch switch for a 100V load and a branch switch for a 200V load, but the common terminal T1 of each of the branch switches 50a and 50b for expansion. Is arranged at a height position corresponding to the L1 phase conductive bar 61, and the selection terminal T2 is located between a height position corresponding to the L2 phase conductive bar 62 and a height position corresponding to the N phase conductive bar 63. Since it is movable, one terminal (common terminal T1) is always connected to the L1 phase conductive bar 61, and the other terminal (selection terminal T2) is either the L2 phase or N phase conductive bar 62, 63. Will be connected.
[0044]
Therefore, when the extension branch switches 50a and 50b are used for a 100V load, both terminals T1 and T2 are connected to the L1 phase and the N phase, and are connected to the extension branch switches 50a and 50b. Since the load is connected only between the L1 phase and the N phase, and not connected between the L2 phase and the N phase, a neutral wire missing phase occurs and the protection function of the main switch 20 is activated ( In the case where the primary side and the secondary side of the main switch 20 are interrupted), no voltage is applied to the load connected to the extension branch switches 50a and 50b, and no overvoltage is applied. Damage can be prevented.
[0045]
Further, since the selection terminal T2 is movable between the second height position and the third height position, by moving the selection terminal T2, the L2 phase and N phase conductive bars 62, One additional branch switch 50a, 50b can be used for a 100V load or a 200V load, and therefore one for a 100V load and one for a 200V load. Since it is not necessary to manufacture the switch separately, the number of branch switches for expansion can be reduced, and the cost can be reduced by the mass production effect.
[0046]
In this embodiment, of the two extension branch switches 50a and 50b, one extension branch switch 50a is used for a 100V load, and the other extension branch switch 50b is used for a 200V load. However, the selection terminals T2 of both the extension branch switches 50a and 50b may be moved to a position corresponding to the upper conductive bar 63 and used for a 100V load. In this case, the two extension branch switches 50a and 50b are both for 100V load, but since both are connected to the L1 phase and the N phase, the neutral wire missing phase occurs as described above. When the protection function of the main switch 20 is activated, no voltage is applied to the two additional branch switches 50a and 50b, so that an overvoltage is applied to the load connected to the additional branch switches 50a and 50b. In addition, damage to the load can be prevented. Further, although the case where the number of extension branch switches is two has been described as an example, the number of extension branch switches is not limited to two, and may be three or more.
[0047]
In this embodiment, power is supplied to the extension branch switches 50a and 50b from the primary side of the main switch 20 via the branch lines 49a to 49c. Power may be supplied to the extension branch switches 50a and 50b via 49c.
[0048]
【The invention's effect】
As described above, the invention of claim 1 is the primary side or the main side of the main switch that is electrically connected to the single-phase three-wire wiring line that feeds power by three wires of two voltage lines and a neutral wire. A branch circuit expansion structure of a distribution board in which an extension branch switch is electrically connected to any of the secondary sides to add a branch circuit, and either the primary side or the secondary side of the main switch The three conductive bars are electrically connected to the three terminals on the side through branch wires, and are composed of three conductive bars arranged at different heights and a plurality of branch switches for expansion. A conductive bar electrically connected to one of the voltage lines is disposed at the first height position, Connected to conductive bar and neutral wire connected to the other voltage line Conductive bars are arranged at the second and third height positions, respectively, and a conductive bar electrically connected to one voltage line is plugged into one side of the body of each additional branch switch. While arranging the first receiving blade at the first height position, Of the conductive bar connected to the other voltage line or the conductive bar connected to the neutral line The second receiving blade inserted and connected to either one of the two receiving blades is movably disposed between the second height position and the third height position. Since the second receiving blade is movably disposed between the second height position and the third height position, the second receiving blade is disposed at the other height position. When arranged at a height position corresponding to the voltage line, it can be used for a 200V load, and when the second receiving blade is arranged at a height position corresponding to the neutral line, it can be used for a 100V load. Moreover, since the first receiving blade is fixed at a height position corresponding to one voltage phase, even if a plurality of extension branch switches are used for a 100V load, all the extension branch switches are Since it is connected to one voltage line and neutral line and not to the other voltage line, the load fed via the extension branch switch is between one voltage line and neutral line. Therefore, if a neutral wire phase loss occurs, the voltage is not applied to the load connected via the extension branch switch, so the neutral wire phase loss causes an overvoltage to the load. As a result, the load can be prevented from being damaged.
[0049]
further, Since the second receiving blade can be selectively connected to one of the remaining two conductive bars by moving the second receiving blade, one additional branch switch is used for 100V load or 200V. It can be used as a load, so there is no need to manufacture a 100V load and a 200V load separately. Therefore, the number of branch switches for expansion can be reduced, and the cost can be reduced by mass production. effective.
[Brief description of the drawings]
FIG. 1 shows a state in which an extension branch switch used in this embodiment is used for 100 V, (a) is a side view in which a part of a first side case is omitted, and (b) is a side view of a first side case. It is the other side view which can be partially omitted.
FIGS. 2A and 2B show a state in which the extension branch switch for extension is used for 200V, in which FIG. 2A is a side view in which a part of the first side case can be omitted, and FIG. FIG.
FIG. 3 is an explanatory diagram for explaining the overall configuration of the above.
FIG. 4 is an exploded perspective view of the extension block of the above.
FIG. 5 is a side view showing a state in which the cover of the extension block is removed.
FIG. 6 is an external perspective view of the additional block same as above.
FIG. 7 is an exploded perspective view showing the relationship between a slide member and a selection terminal used in the extension branch switch of the above.
FIG. 8 is an exploded perspective view showing a relationship between the slide member, the first side case, and the second side case, partly omitted.
[Explanation of symbols]
51 body
T1 common terminal
T2 selection terminal

Claims

A branch switch for expansion is installed on either the primary side or the secondary side of the main switch that is electrically connected to a single-phase three-wire wiring line that feeds power with three wires, two voltage wires and a neutral wire. A branch circuit expansion structure for a distribution board that is electrically connected to increase the branch circuit,
Three conductive bars electrically connected to three terminals on either the primary side or the secondary side of the main switch via branch wirings and arranged at different heights, and a plurality of bars This is composed of a branch switch for expansion, and a conductive bar electrically connected to one of the three conductive bars is arranged at the first height position and connected to the other voltage line The conductive bar connected to the neutral line and the conductive bar connected to the neutral line are arranged at the second and third height positions, respectively, and the one voltage line is electrically connected to one side of each extension branch switch. The first receiving blade to which the conductive bar to be connected is inserted and connected is arranged at the first height position, and the conductive bar connected to the other voltage line or the conductive line connected to the neutral line a second receiving blades which are plugged either one of the bar, the second height position and the third height position Branch circuit expansion structure panelboard, characterized in that the freely arranged mobile between.