{"id":50307,"date":"2026-03-23T05:45:11","date_gmt":"2026-03-23T05:45:11","guid":{"rendered":"https:\/\/www.kdmsteel.com\/?p=50307"},"modified":"2026-03-23T05:45:11","modified_gmt":"2026-03-23T05:45:11","slug":"top-electrical-junction-box-rules","status":"publish","type":"post","link":"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/","title":{"rendered":"\u5b89\u5168\u3068\u6cd5\u4ee4\u9075\u5b88\u306e\u305f\u3081\u306b\u5fc5\u305a\u5b88\u308b\u3079\u304d\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306b\u95a2\u3059\u308b\u91cd\u8981\u306a\u898f\u5247"},"content":{"rendered":"<p>\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u4e9b\u7d30\u306a\u30df\u30b9\u304c\u539f\u56e0\u3067\u96fb\u6c17\u8a66\u9a13\u306b\u4e0d\u5408\u683c\u306b\u306a\u3063\u305f\u7d4c\u9a13\u306f\u3042\u308a\u307e\u305b\u3093\u304b\uff1f\u305d\u3093\u306a\u7d4c\u9a13\u306f\u3042\u306a\u305f\u3060\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u7c73\u56fd\u96fb\u6c17\u5de5\u4e8b\u898f\u7a0b\uff08NEC\uff09\u3092\u7406\u89e3\u3059\u308b\u306e\u306f\u96e3\u3057\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u898f\u5247\u306b\u5f93\u3046\u3053\u3068\u306f\u5b89\u5168\u3068\u6cd5\u4ee4\u9075\u5b88\u306e\u305f\u3081\u306b\u4e0d\u53ef\u6b20\u3067\u3059\u3002\u3053\u306e\u30ac\u30a4\u30c9\u3067\u306f\u3001\u96fb\u6c17\u306b\u95a2\u3059\u308bNEC\u306e\u898f\u5247\u3092\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002 <a href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/\"><strong><b>\u30b8\u30e5<\/b><b>\u8a8d\u8a3c\u30dc\u30c3\u30af\u30b9 NEC\u30b3\u30fc\u30c9\u898f\u683c<\/b><\/strong><\/a>\u00a0\u4ed5\u4e8b\u3092\u6b63\u3057\u304f\u9042\u884c\u3057\u3001\u30c1\u30fc\u30e0\u306e\u5b89\u5168\u3092\u78ba\u4fdd\u3057\u3001\u3059\u3079\u3066\u306e\u30c6\u30b9\u30c8\u306b\u697d\u3005\u3068\u5408\u683c\u3059\u308b\u305f\u3081\u306b\u3001\u5f93\u3046\u3079\u304d\u624b\u9806\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u76ee\u6b21<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"\u76ee\u6b21\u3092\u5207\u308a\u66ff\u3048\u308b\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">\u30c8\u30b0\u30eb<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#What_Is_an_Electrical_Junction_Box\" >\u96fb\u6c17\u63a5\u7d9a\u7bb1\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Top_12_Electrical_Junction_Box_Rules_You_Must_Follow\" >\u5fc5\u305a\u5b88\u308b\u3079\u304d\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30eb\u30fc\u30eb \u30c8\u30c3\u30d712<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Always_Use_a_Junction_Box_for_Wire_Splices\" >\u96fb\u7dda\u63a5\u7d9a\u306b\u306f\u5fc5\u305a\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Ensure_Proper_Box_Sizing_Box_Fill_Capacity_Rule\" >\u9069\u5207\u306a\u7bb1\u306e\u30b5\u30a4\u30ba\u3092\u78ba\u4fdd\u3059\u308b\uff08\u7bb1\u306e\u5145\u586b\u5bb9\u91cf\u30eb\u30fc\u30eb\uff09<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Maintain_Minimum_Free_Conductor_Length\" >\u81ea\u7531\u5c0e\u4f53\u306e\u6700\u5c0f\u9577\u3055\u3092\u7dad\u6301\u3059\u308b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Always_Keep_Junction_Boxes_Accessible\" >\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306f\u5e38\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3084\u3059\u3044\u5834\u6240\u306b\u7f6e\u3044\u3066\u304a\u304f\u3053\u3068<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Install_Proper_Covers_on_All_Junction_Boxes\" >\u3059\u3079\u3066\u306e\u63a5\u7d9a\u7bb1\u306b\u9069\u5207\u306a\u30ab\u30d0\u30fc\u3092\u53d6\u308a\u4ed8\u3051\u3066\u304f\u3060\u3055\u3044\u3002<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Ensure_Proper_Grounding\" >\u9069\u5207\u306a\u63a5\u5730\u3092\u78ba\u4fdd\u3059\u308b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Use_the_Right_Type_of_Junction_Box\" >\u9069\u5207\u306a\u30bf\u30a4\u30d7\u306e\u63a5\u7d9a\u7bb1\u3092\u4f7f\u7528\u3059\u308b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Follow_Clearance_and_Working_Space_Requirements\" >\u30af\u30ea\u30a2\u30e9\u30f3\u30b9\u3068\u4f5c\u696d\u30b9\u30da\u30fc\u30b9\u306e\u8981\u4ef6\u306b\u5f93\u3063\u3066\u304f\u3060\u3055\u3044<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Secure_and_Properly_Mount_the_Junction_Box\" >\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u3092\u3057\u3063\u304b\u308a\u3068\u56fa\u5b9a\u3057\u3001\u9069\u5207\u306b\u53d6\u308a\u4ed8\u3051\u308b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Use_Approved_Connectors_and_Fittings\" >\u627f\u8a8d\u6e08\u307f\u306e\u30b3\u30cd\u30af\u30bf\u3068\u7d99\u624b\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Protect_Junction_Boxes_in_Damp_or_Hazardous_Locations\" >\u6e7f\u6c17\u306e\u591a\u3044\u5834\u6240\u3084\u5371\u967a\u306a\u5834\u6240\u306b\u3042\u308b\u63a5\u7d9a\u7bb1\u306f\u4fdd\u8b77\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Do_Not_Compromise_Fire_Safety_Requirements\" >\u706b\u707d\u5b89\u5168\u8981\u4ef6\u3092\u6c7a\u3057\u3066\u59a5\u5354\u3057\u306a\u3044\u3067\u304f\u3060\u3055\u3044<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Common_Electrical_Junction_Box_Mistakes_to_Avoid\" >\u96fb\u6c17\u63a5\u7d9a\u7bb1\u3067\u3088\u304f\u3042\u308b\u9593\u9055\u3044\u3092\u907f\u3051\u308b\u65b9\u6cd5<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Overcrowding_Wires\" >\u914d\u7dda\u306e\u904e\u5bc6\u72b6\u614b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Hidden_or_Buried_Boxes\" >\u96a0\u3055\u308c\u305f\u7bb1\u307e\u305f\u306f\u57cb\u3082\u308c\u305f\u7bb1<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Missing_Covers\" >\u8868\u7d19\u304c\u6b20\u843d\u3057\u3066\u3044\u308b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Poor_Grounding\" >\u63a5\u5730\u4e0d\u826f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Using_Wrong_Box_Type\" >\u9593\u9055\u3063\u305f\u30dc\u30c3\u30af\u30b9\u30bf\u30a4\u30d7\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Loose_Mounting\" >\u7de9\u3044\u53d6\u308a\u4ed8\u3051<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Electrical_Junction_Box_Installation_Best_Practices\" >\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u8a2d\u7f6e\u306b\u95a2\u3059\u308b\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Plan_Box_Placement_before_Wiring\" >\u914d\u7dda\u524d\u306b\u30dc\u30c3\u30af\u30b9\u306e\u914d\u7f6e\u3092\u8a08\u753b\u3059\u308b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Label_Circuits_Clearly\" >\u56de\u8def\u306b\u306f\u660e\u78ba\u306a\u30e9\u30d9\u30eb\u3092\u8cbc\u308b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Leave_Extra_Wire_Length\" >\u4f59\u5206\u306a\u9577\u3055\u306e\u30ef\u30a4\u30e4\u30fc\u3092\u6b8b\u3057\u3066\u304a\u304f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Use_High-Quality_Enclosures\" >\u9ad8\u54c1\u8cea\u306e\u7b50\u4f53\u3092\u4f7f\u7528\u3059\u308b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Follow_Manufacturer_Instructions\" >\u88fd\u9020\u5143\u306e\u6307\u793a\u306b\u5f93\u3063\u3066\u304f\u3060\u3055\u3044<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Conclusion\" >\u7d50\u8ad6<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#FAQs\" >\u3088\u304f\u3042\u308b\u8cea\u554f<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Can_you_legally_hide_a_junction_box_behind_drywall_or_ceiling\" >\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u3092\u77f3\u818f\u30dc\u30fc\u30c9\u3084\u5929\u4e95\u306e\u88cf\u306b\u96a0\u3059\u3053\u3068\u306f\u5408\u6cd5\u3067\u3059\u304b\uff1f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#How_many_wires_are_allowed_inside_a_junction_box\" >\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u5185\u306b\u306f\u4f55\u672c\u306e\u96fb\u7dda\u3092\u53ce\u5bb9\u3067\u304d\u307e\u3059\u304b\uff1f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Do_all_junction_boxes_need_a_cover\" >\u3059\u3079\u3066\u306e\u63a5\u7d9a\u7bb1\u306b\u30ab\u30d0\u30fc\u304c\u5fc5\u8981\u3067\u3059\u304b\uff1f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Are_plastic_junction_boxes_safer_than_metal_ones\" >\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u88fd\u306e\u63a5\u7d9a\u7bb1\u306f\u91d1\u5c5e\u88fd\u306e\u3082\u306e\u3088\u308a\u5b89\u5168\u306a\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#What_are_the_clearance_requirements_around_junction_boxes\" >\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u5468\u8fba\u306e\u30af\u30ea\u30a2\u30e9\u30f3\u30b9\u8981\u4ef6\u306f\u4f55\u3067\u3059\u304b\uff1f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Is_labeling_required_inside_junction_boxes\" >\u63a5\u7d9a\u7bb1\u5185\u90e8\u3078\u306e\u30e9\u30d9\u30eb\u8cbc\u4ed8\u306f\u5fc5\u8981\u3067\u3059\u304b\uff1f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#What_is_the_difference_between_a_junction_box_and_an_outlet_box\" >\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u3068\u30a2\u30a6\u30c8\u30ec\u30c3\u30c8\u30dc\u30c3\u30af\u30b9\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Can_you_reuse_an_old_junction_box_during_renovations\" >\u6539\u4fee\u5de5\u4e8b\u306e\u969b\u306b\u3001\u53e4\u3044\u63a5\u7d9a\u7bb1\u3092\u518d\u5229\u7528\u3067\u304d\u307e\u3059\u304b\uff1f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/#Are_junction_boxes_required_in_industrial_installations\" >\u7523\u696d\u8a2d\u5099\u306b\u304a\u3044\u3066\u3001\u63a5\u7d9a\u7bb1\u306f\u5fc5\u8981\u3067\u3059\u304b\uff1f<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_an_Electrical_Junction_Box\"><\/span><strong><b>\u96fb\u6c17\u63a5\u7d9a\u7bb1\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u96fb\u6c17\u306b\u3064\u3044\u3066\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046 <a href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u3068\u306f\u4f55\u3067\u3059\u304b\/\"><strong><b>\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9<\/b><\/strong><\/a>\u00a0\u3042\u3089\u3086\u308b\u914d\u7dda\u30b7\u30b9\u30c6\u30e0\u306e\u4e3b\u5f79\u3068\u306a\u308b\u5b58\u5728\u3067\u3059\u3002\u3059\u3079\u3066\u306e\u914d\u7dda\u63a5\u7d9a\u90e8\u3084\u63a5\u5408\u90e8\u306f\u3001\u901a\u5e38\u91d1\u5c5e\u307e\u305f\u306f\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u88fd\u306e\u3053\u306e\u30dc\u30c3\u30af\u30b9\u306b\u5b89\u5168\u306b\u4fdd\u7ba1\u3055\u308c\u307e\u3059\u3002\u9632\u706b\u5bfe\u7b56\u3068\u3057\u3066\u3001\u305d\u306e\u4e3b\u306a\u5f79\u5272\u306f\u3001\u706b\u82b1\u3001\u71b1\u3001\u77ed\u7d61\u306b\u3088\u308b\u5efa\u7269\u706b\u707d\u306e\u767a\u751f\u3092\u9632\u3050\u3053\u3068\u3067\u3059\u3002\u4f4f\u5b85\u3067\u3082\u5de5\u5834\u3067\u3082\u3001\u96fb\u6c17\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u5b89\u5168\u304b\u3064\u6574\u7406\u3055\u308c\u305f\u72b6\u614b\u306b\u4fdd\u3064\u305f\u3081\u306b\u306f\u3001\u3053\u308c\u3089\u306e\u30dc\u30c3\u30af\u30b9\u304c\u4e0d\u53ef\u6b20\u3067\u3059\u3002.<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-49441\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-2.jpg\" alt=\"\u96fb\u6c17\u63a5\u7d9a\u7bb1\uff08\uff12\uff09\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-2.jpg 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-2-150x84.jpg 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-2-768x432.jpg 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-2-18x10.jpg 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Top_12_Electrical_Junction_Box_Rules_You_Must_Follow\"><\/span><strong><b>\u5fc5\u305a\u5b88\u308b\u3079\u304d\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30eb\u30fc\u30eb \u30c8\u30c3\u30d712<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Always_Use_a_Junction_Box_for_Wire_Splices\"><\/span><strong><b>\u96fb\u7dda\u63a5\u7d9a\u306b\u306f\u5fc5\u305a\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>NEC 300.15\u306e\u898f\u5b9a\u306b\u3088\u308c\u3070\u3001\u3059\u3079\u3066\u306e\u96fb\u7dda\u63a5\u7d9a\u90e8\u306f\u9069\u5207\u306a\u30dc\u30c3\u30af\u30b9\u306b\u53ce\u3081\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u9732\u51fa\u3057\u305f\u63a5\u7d9a\u90e8\u306e\u7de9\u3093\u3060\u7aef\u5b50\u306f\u706b\u82b1\u3092\u767a\u751f\u3055\u305b\u3001\u8fd1\u304f\u306e\u7269\u306b\u5f15\u706b\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u3001\u91cd\u5927\u306a\u706b\u707d\u30ea\u30b9\u30af\u3068\u306a\u308a\u307e\u3059\u3002\u3053\u3046\u3057\u305f\u6f5c\u5728\u7684\u306a\u4e0d\u5177\u5408\u306f\u3001\u9069\u5207\u306b\u8a2d\u7f6e\u3055\u308c\u305f\u63a5\u7d9a\u7bb1\u5185\u306b\u53ce\u3081\u3089\u308c\u3066\u304a\u308a\u3001\u5efa\u7269\u306e\u69cb\u9020\u3068\u305d\u3053\u306b\u5c45\u4f4f\u307e\u305f\u306f\u52e4\u52d9\u3059\u308b\u4eba\u3005\u3092\u4fdd\u8b77\u3057\u307e\u3059\u3002\u3053\u306e\u57fa\u672c\u30eb\u30fc\u30eb\u306b\u4f8b\u5916\u306f\u3042\u308a\u307e\u305b\u3093\u30022\u672c\u306e\u96fb\u7dda\u3092\u63a5\u7d9a\u3059\u308b\u969b\u306f\u3001\u5fc5\u305a\u627f\u8a8d\u3055\u308c\u305f\u63a5\u7d9a\u7bb1\u3092\u4f7f\u7528\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Ensure_Proper_Box_Sizing_Box_Fill_Capacity_Rule\"><\/span><strong><b>\u9069\u5207\u306a\u7bb1\u306e\u30b5\u30a4\u30ba\u3092\u78ba\u4fdd\u3059\u308b\uff08\u7bb1\u306e\u5145\u586b\u5bb9\u91cf\u30eb\u30fc\u30eb\uff09<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>NEC 314.16\u3067\u306f\u3001\u5371\u967a\u306a\u904e\u5bc6\u72b6\u614b\u3092\u907f\u3051\u308b\u305f\u3081\u3001\u30dc\u30c3\u30af\u30b9\u5185\u306e\u5145\u586b\u7387\u3092\u5177\u4f53\u7684\u306b\u898b\u7a4d\u3082\u308b\u3053\u3068\u3092\u7fa9\u52d9\u4ed8\u3051\u3066\u3044\u307e\u3059\u3002\u5c0e\u4f53\u304c\u591a\u3059\u304e\u308b\u3068\u71b1\u304c\u767a\u751f\u3057\u3001\u6a5f\u5668\u306e\u8a2d\u7f6e\u304c\u56f0\u96e3\u306b\u306a\u308a\u3001\u96fb\u7dda\u306e\u7d76\u7e01\u304c\u640d\u50b7\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u30dc\u30c3\u30af\u30b9\u306e\u5bb9\u7a4d\uff08\u7acb\u65b9\u30a4\u30f3\u30c1\uff09\u3092\u8a08\u7b97\u3057\u3001\u3059\u3079\u3066\u306e\u96fb\u7dda\u3001\u6a5f\u5668\u3001\u304a\u3088\u3073\u4ed8\u5c5e\u54c1\u3092\u542b\u3081\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30e1\u30fc\u30ab\u30fc\u306f\u5404\u30dc\u30c3\u30af\u30b9\u306e\u5185\u5074\u306b\u5bb9\u91cf\u3092\u8a18\u8f09\u3057\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u5fc5\u305a\u3053\u308c\u3089\u306e\u6570\u5024\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u898b\u7a4d\u91cf\u304c\u6700\u5927\u5bb9\u91cf\u306b\u8fd1\u3065\u304f\u5834\u5408\u306f\u3001\u3088\u308a\u5927\u304d\u306a\u7b50\u4f53\u3092\u9078\u629e\u3059\u308b\u306e\u304c\u8ce2\u660e\u3067\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Maintain_Minimum_Free_Conductor_Length\"><\/span><strong><b>\u81ea\u7531\u5c0e\u4f53\u306e\u6700\u5c0f\u9577\u3055\u3092\u7dad\u6301\u3059\u308b<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u81ea\u7531\u914d\u7dda\u306f\u3001\u30dc\u30c3\u30af\u30b9\u306e\u958b\u53e3\u90e8\u304b\u3089\u5c11\u306a\u304f\u3068\u30826\u30a4\u30f3\u30c1\u4f38\u3073\u3066\u3044\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002 <a href=\"https:\/\/allstarce.com\/wp-content\/uploads\/2016\/12\/2017-NEC-Code-Ch-3-Article-300-2.pdf\"><strong><b>NEC 300.14<\/b><\/strong><\/a>. \u3053\u306e\u898f\u683c\u306f\u3001\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u63a5\u7d9a\u3001\u826f\u597d\u306a\u63a5\u7d9a\u3001\u305d\u3057\u3066\u5c06\u6765\u7684\u306a\u5909\u66f4\u306b\u5bfe\u5fdc\u3067\u304d\u308b\u5341\u5206\u306a\u30b9\u30da\u30fc\u30b9\u3092\u78ba\u4fdd\u3059\u308b\u3053\u3068\u3092\u76ee\u7684\u3068\u3057\u3066\u3044\u307e\u3059\u3002\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6642\u306b\u306f\u3001\u7279\u306b\u4f01\u696d\u88fd\u306e\u5927\u578b\u7b50\u4f53\u3092\u4f7f\u7528\u3059\u308b\u7523\u696d\u7528\u9014\u306b\u304a\u3044\u3066\u3001\u3053\u306e\u8981\u4ef6\u304c\u975e\u5e38\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002\u914d\u7dda\u5de5\u4e8b\u6bb5\u968e\u3067\u6b63\u78ba\u306a\u5bf8\u6cd5\u3092\u6e2c\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u5f8c\u3005\u4f5c\u696d\u30a8\u30ea\u30a2\u304c\u7169\u96d1\u3067\u5371\u967a\u306a\u72b6\u614b\u306b\u306a\u308b\u306e\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Always_Keep_Junction_Boxes_Accessible\"><\/span><strong><b>\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306f\u5e38\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3084\u3059\u3044\u5834\u6240\u306b\u7f6e\u3044\u3066\u304a\u304f\u3053\u3068<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>NEC 314.29 \u306b\u5f93\u3044\u3001\u3059\u3079\u3066\u306e\u30b9\u30a4\u30c3\u30c1\u30dc\u30c3\u30af\u30b9\u306f\u3001\u5efa\u7269\u306e\u90e8\u6750\u3092\u53d6\u308a\u5916\u3059\u3053\u3068\u306a\u304f\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u5834\u6240\u306b\u8a2d\u7f6e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30dc\u30c3\u30af\u30b9\u3092\u4e7e\u5f0f\u58c1\u3001\u56fa\u5b9a\u30d1\u30cd\u30eb\u3001\u307e\u305f\u306f\u5929\u4e95\u69cb\u9020\u7269\u306e\u88cf\u306b\u96a0\u3059\u3053\u3068\u306f\u898f\u5247\u9055\u53cd\u3067\u3059\u3002\u5c06\u6765\u306e\u4fee\u7406\u3001\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u3001\u304a\u3088\u3073\u30b7\u30b9\u30c6\u30e0\u5909\u66f4\u306b\u5099\u3048\u3001\u3059\u3079\u3066\u306e\u63a5\u7d9a\u90e8\u3068\u30ea\u30f3\u30af\u90e8\u306f\u5bb9\u6613\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u5834\u6240\u306b\u8a2d\u7f6e\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30dc\u30c3\u30af\u30b9\u306f\u3001\u30ab\u30d0\u30fc\u306b\u7c21\u5358\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u5834\u6240\u306b\u8a2d\u7f6e\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u5c06\u6765\u306e\u96fb\u6c17\u5de5\u4e8b\u306b\u3082\u5bfe\u5fdc\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Install_Proper_Covers_on_All_Junction_Boxes\"><\/span><strong><b>\u3059\u3079\u3066\u306e\u63a5\u7d9a\u7bb1\u306b\u9069\u5207\u306a\u30ab\u30d0\u30fc\u3092\u53d6\u308a\u4ed8\u3051\u3066\u304f\u3060\u3055\u3044\u3002<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u4f5c\u696d\u304c\u5b8c\u4e86\u3057\u305f\u3089\u3001\u305d\u308c\u305e\u308c<strong><b>\u00a0<\/b><\/strong><a href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u7a2e\u985e\/\"><strong><b>\u3055\u307e\u3056\u307e\u306a\u7a2e\u985e\u306e\u63a5\u7d9a\u7bb1<\/b><\/strong><\/a>\u00a0NEC 314.25 \u306b\u5f93\u3063\u3066\u3001\u9069\u5207\u306a\u30ab\u30d0\u30fc\u3001\u30d5\u30a7\u30fc\u30b9\u30d7\u30ec\u30fc\u30c8\u3001\u307e\u305f\u306f\u8986\u3044\u3092\u53d6\u308a\u4ed8\u3051\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30ab\u30d0\u30fc\u306f\u3001\u30a2\u30fc\u30af\u653e\u96fb\u306e\u62e1\u6563\u3092\u9632\u304e\u3001\u4eba\u304c\u8aa4\u3063\u3066\u6d3b\u96fb\u90e8\u306b\u89e6\u308c\u308b\u306e\u3092\u9632\u304e\u3001\u7570\u7269\u306e\u4fb5\u5165\u3092\u9632\u304e\u307e\u3059\u3002\u30cd\u30b8\u306e\u9078\u629e\u306b\u306f\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002\u77f3\u818f\u30dc\u30fc\u30c9\u7528\u30cd\u30b8\u306f\u4f7f\u7528\u3067\u304d\u307e\u305b\u3093\u3002\u30ab\u30d0\u30fc\u306f\u3001\u30dc\u30c3\u30af\u30b9\u306e\u306d\u3058\u5c71\u30b2\u30fc\u30b8\u306b\u9069\u5408\u3059\u308b\u6a5f\u68b0\u306d\u3058\u3001\u307e\u305f\u306f\u30e1\u30fc\u30ab\u30fc\u304b\u3089\u63d0\u4f9b\u3055\u308c\u305f\u30d5\u30a1\u30b9\u30ca\u30fc\u306e\u307f\u3092\u4f7f\u7528\u3057\u3066\u53d6\u308a\u4ed8\u3051\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u9069\u5207\u306a\u30b5\u30dd\u30fc\u30c8\u3068\u9577\u671f\u7684\u306a\u4fe1\u983c\u6027\u304c\u78ba\u4fdd\u3055\u308c\u307e\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Ensure_Proper_Grounding\"><\/span><strong><b>\u9069\u5207\u306a\u63a5\u5730\u3092\u78ba\u4fdd\u3059\u308b<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>NEC 250.148 \u306e\u898f\u5b9a\u306b\u5f93\u3044\u3001\u3059\u3079\u3066\u306e\u6a5f\u5668\u306e\u63a5\u5730\u5c0e\u4f53\u306f\u91d1\u5c5e\u88fd\u306e\u63a5\u7d9a\u7bb1\u81ea\u4f53\u306b\u63a5\u7d9a\u3055\u308c\u3001\u30dc\u30f3\u30c7\u30a3\u30f3\u30b0\u3055\u308c\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u6545\u969c\u96fb\u6d41\u7d4c\u8def\u304c\u5730\u9762\u307e\u3067\u4f38\u3073\u3001\u5371\u967a\u306a\u30a8\u30cd\u30eb\u30ae\u30fc\u3092\u5b89\u5168\u306b\u5730\u9762\u306b\u6d41\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u63a5\u7d9a\u306b\u306f\u3001\u3053\u306e\u76ee\u7684\u306e\u305f\u3081\u306b\u4f5c\u3089\u308c\u305f\u7dd1\u8272\u306e\u63a5\u5730\u30cd\u30b8\u3001\u30ea\u30b9\u30c8\u306b\u8a18\u8f09\u3055\u308c\u3066\u3044\u308b\u63a5\u5730\u30af\u30ea\u30c3\u30d7\u3001\u307e\u305f\u306f\u305d\u306e\u4ed6\u306e\u8a31\u53ef\u3055\u308c\u305f\u63a5\u5730\u88c5\u7f6e\u304c\u5fc5\u8981\u3067\u3059\u3002\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u88fd\u306e\u7bb1\u306f\u5c0e\u96fb\u6027\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u305d\u306e\u4e2d\u306b\u8a2d\u7f6e\u3055\u308c\u305f\u96fb\u5b50\u6a5f\u5668\u306f\u3001\u63a5\u5730\u7dda\u3067\u3042\u308b\u56de\u8def\u3092\u901a\u3057\u3066\u63a5\u5730\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Use_the_Right_Type_of_Junction_Box\"><\/span><strong><b>\u9069\u5207\u306a\u30bf\u30a4\u30d7\u306e\u63a5\u7d9a\u7bb1\u3092\u4f7f\u7528\u3059\u308b<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>NEC 314.15\u304a\u3088\u3073\u95a2\u9023\u6761\u9805\u306b\u5f93\u3044\u3001\u30a8\u30f3\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u306f\u7528\u9014\u306b\u9069\u5408\u3057\u3001\u305d\u306e\u4ed5\u69d8\u3092\u660e\u8a18\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u6a19\u6e96\u7684\u306a\u30b3\u30f3\u30bb\u30f3\u30c8\u30dc\u30c3\u30af\u30b9\u306f\u632f\u52d5\u3084\u52d5\u8377\u91cd\u306b\u5bfe\u5fdc\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u5929\u4e95\u6247\u98a8\u6a5f\u306e\u8a2d\u7f6e\u306b\u306f\u300c\u5929\u4e95\u6247\u98a8\u6a5f\u652f\u6301\u7528\u300d\u3068\u8a18\u8f09\u3055\u308c\u305f\u30dc\u30c3\u30af\u30b9\u3092\u4f7f\u7528\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u96e8\u306e\u591a\u3044\u5730\u57df\u3067\u306f\u3001\u6c34\u306e\u4fb5\u5165\u3092\u9632\u3050\u8010\u5019\u6027\u306e\u3042\u308b\u30b7\u30a7\u30eb\u30bf\u30fc\u304c\u5fc5\u8981\u3067\u3059\u3002\u4e0d\u9069\u5207\u306a\u30dc\u30c3\u30af\u30b9\u3092\u9078\u629e\u3059\u308b\u3068\u3001\u5de5\u5177\u304c\u7834\u640d\u3057\u305f\u308a\u3001\u91d1\u5c5e\u304c\u9306\u3073\u305f\u308a\u3001\u691c\u67fb\u6642\u306b\u78ba\u5b9f\u306b\u898f\u5247\u9055\u53cd\u3068\u306a\u308a\u307e\u3059\u3002.<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-49444\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-5.jpg\" alt=\"\u96fb\u6c17\u63a5\u7d9a\u7bb1\uff08\uff15\uff09\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-5.jpg 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-5-150x84.jpg 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-5-768x432.jpg 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-5-18x10.jpg 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Follow_Clearance_and_Working_Space_Requirements\"><\/span><strong><b>\u30af\u30ea\u30a2\u30e9\u30f3\u30b9\u3068\u4f5c\u696d\u30b9\u30da\u30fc\u30b9\u306e\u8981\u4ef6\u306b\u5f93\u3063\u3066\u304f\u3060\u3055\u3044<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>NEC 314.29\u3067\u306f\u63a5\u7d9a\u30dc\u30c3\u30af\u30b9\u3078\u306e\u30a2\u30af\u30bb\u30b9\u304c\u5bb9\u6613\u3067\u3042\u308b\u3053\u3068\u304c\u3001NEC 110.26\u3067\u306f\u5927\u578b\u6a5f\u5668\u306e\u8a66\u9a13\u304c\u7fa9\u52d9\u4ed8\u3051\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u4fdd\u7ba1\u5834\u6240\u3001\u30d1\u30cd\u30eb\u3001\u307e\u305f\u306f\u6052\u4e45\u7684\u306a\u8a2d\u7f6e\u7269\u306f\u3001\u30ab\u30d0\u30fc\u306e\u53d6\u308a\u5916\u3057\u3084\u4fee\u7406\u306e\u59a8\u3052\u306b\u306a\u3063\u3066\u306f\u306a\u308a\u307e\u305b\u3093\u3002KDM Steel\u306e\u9811\u4e08\u306a\u7b50\u4f53\u3092\u7523\u696d\u74b0\u5883\u3067\u4f7f\u7528\u3059\u308b\u5834\u5408\u3001\u4fee\u7406\u4f5c\u696d\u54e1\u304c\u8fc5\u901f\u306b\u554f\u984c\u3092\u89e3\u6c7a\u3067\u304d\u308b\u3088\u3046\u3001\u4f5c\u696d\u30b9\u30da\u30fc\u30b9\u3092\u8a08\u753b\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u30ab\u30d0\u30fc\u306e\u64cd\u4f5c\u304c\u59a8\u3052\u3089\u308c\u308b\u3068\u3001\u4ed6\u306e\u9069\u5408\u63aa\u7f6e\u304c\u8b1b\u3058\u3089\u308c\u3066\u3044\u3066\u3082\u3001\u8a2d\u7f6e\u306f\u898f\u5b9a\u306e\u8981\u4ef6\u3092\u6e80\u305f\u3057\u307e\u305b\u3093\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Secure_and_Properly_Mount_the_Junction_Box\"><\/span><strong><b>\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u3092\u3057\u3063\u304b\u308a\u3068\u56fa\u5b9a\u3057\u3001\u9069\u5207\u306b\u53d6\u308a\u4ed8\u3051\u308b<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>NEC 314.23\u306b\u3088\u308b\u3068\u3001\u3059\u3079\u3066\u306e\u30dc\u30c3\u30af\u30b9\u306f\u5efa\u7269\u306e\u57fa\u790e\u306b\u3057\u3063\u304b\u308a\u3068\u500b\u5225\u306b\u56fa\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u77f3\u818f\u30dc\u30fc\u30c9\u3060\u3051\u3067\u306f\u5341\u5206\u306a\u652f\u6301\u304c\u5f97\u3089\u308c\u305a\u3001\u898f\u5b9a\u9055\u53cd\u3068\u306a\u308a\u307e\u3059\u3002\u65b0\u7bc9\u306e\u5834\u5408\u306f\u3001\u5de5\u5834\u51fa\u8377\u6642\u306e\u53d6\u308a\u4ed8\u3051\u30d6\u30e9\u30b1\u30c3\u30c8\u3092\u4f7f\u7528\u3057\u3066\u3001\u9593\u67f1\u307e\u305f\u306f\u6839\u592a\u306b\u307e\u3063\u3059\u3050\u56fa\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u6539\u4fee\u5de5\u4e8b\u306e\u5834\u5408\u306f\u3001\u9069\u5207\u306a\u30af\u30e9\u30f3\u30d7\u3092\u5099\u3048\u305f\u9069\u5207\u306a\u30ea\u30d5\u30a9\u30fc\u30e0\u7528\u30dc\u30c3\u30af\u30b9\u304c\u5fc5\u8981\u3067\u3059\u3002\u5de5\u696d\u7528\u74b0\u5883\u3067\u306f\u3001\u92f3\u9244\u88fd\u306e\u30dc\u30c3\u30af\u30b9\u306f\u30e9\u30b0\u30dc\u30eb\u30c8\u307e\u305f\u306f\u8cab\u901a\u30dc\u30eb\u30c8\u3092\u4f7f\u7528\u3057\u3066\u9811\u4e08\u306a\u92fc\u6750\u306b\u53d6\u308a\u4ed8\u3051\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30dc\u30c3\u30af\u30b9\u304c\u9577\u671f\u9593\u5b89\u5b9a\u3057\u3001\u5c0e\u4f53\u304c\u4fdd\u8b77\u3055\u308c\u307e\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Use_Approved_Connectors_and_Fittings\"><\/span><strong><b>\u627f\u8a8d\u6e08\u307f\u306e\u30b3\u30cd\u30af\u30bf\u3068\u7d99\u624b\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306b\u5165\u308b\u3059\u3079\u3066\u306e\u96fb\u7dda\u306b\u306f\u3001\u9069\u5207\u306a\u7d99\u624b\u307e\u305f\u306f\u30b3\u30cd\u30af\u30bf\u304c\u5fc5\u8981\u3067\u3059\u3002\u91d1\u5c5e\u30b1\u30fc\u30d6\u30eb\u3092\u91d1\u5c5e\u88fd\u306e\u30dc\u30c3\u30af\u30b9\u306b\u5165\u308c\u308b\u5834\u5408\u3001\u30ce\u30c3\u30af\u30a2\u30a6\u30c8\u306e\u7e01\u304c\u92ed\u5229\u3067\u7d76\u7e01\u4f53\u3092\u640d\u50b7\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u30b3\u30cd\u30af\u30bf\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u958b\u53e3\u90e8\u304c\u6ed1\u3089\u304b\u306b\u306a\u308a\u3001\u30b1\u30fc\u30d6\u30eb\u3092\u6240\u5b9a\u306e\u4f4d\u7f6e\u306b\u4fdd\u6301\u3067\u304d\u307e\u3059\u3002\u975e\u91d1\u5c5e\u88ab\u8986\u30b1\u30fc\u30d6\u30eb\u306b\u306f\u3001\u88ab\u8986\u3092\u640d\u50b7\u3059\u308b\u3053\u3068\u306a\u304f\u4fdd\u6301\u3067\u304d\u308b\u30af\u30e9\u30f3\u30d7\u304c\u5fc5\u8981\u3067\u3059\u3002NEC 300.12\u304a\u3088\u3073\u540c\u69d8\u306e\u6761\u9805\u306b\u3088\u308c\u3070\u3001\u9069\u5207\u306a\u7d99\u624b\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u5c0e\u4f53\u3092\u5b89\u5168\u306b\u4fdd\u3061\u3001\u8a2d\u7f6e\u671f\u9593\u5168\u4f53\u306b\u308f\u305f\u3063\u3066\u5f15\u304d\u629c\u304d\u5fdc\u529b\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Protect_Junction_Boxes_in_Damp_or_Hazardous_Locations\"><\/span><strong><b>\u6e7f\u6c17\u306e\u591a\u3044\u5834\u6240\u3084\u5371\u967a\u306a\u5834\u6240\u306b\u3042\u308b\u63a5\u7d9a\u7bb1\u306f\u4fdd\u8b77\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>NEC 314.15\u306b\u3088\u308b\u3068\u3001\u8a2d\u7f6e\u5834\u6240\u306b\u3088\u3063\u3066\u4f7f\u7528\u3059\u308b\u30b1\u30fc\u30b8\u306e\u7a2e\u985e\u304c\u6c7a\u307e\u308a\u307e\u3059\u3002\u6e7f\u6c17\u306e\u591a\u3044\u5834\u6240\u3067\u306f\u3001\u6c34\u306e\u4fb5\u5165\u3092\u9632\u3050\u305f\u3081\u306b\u30ac\u30b9\u30b1\u30c3\u30c8\u4ed8\u304d\u306e\u84cb\u304c\u4ed8\u3044\u305f\u8010\u5019\u6027\u30dc\u30c3\u30af\u30b9\u304c\u5fc5\u8981\u3067\u3059\u3002NEC\u306e\u7b2c500\u6761\u304a\u3088\u3073\u7b2c516\u6761<strong><b>\u00a0<\/b><\/strong>\u5316\u5b66\u5de5\u5834\u3001\u7a40\u7269\u30b5\u30a4\u30ed\u3001\u5857\u88c5\u5de5\u5834\u306a\u3069\u306e\u5371\u967a\u306a\u5834\u6240\u3092\u8986\u3046\u5fc5\u8981\u304c\u3042\u308b\u3002\u3053\u308c\u3089\u306e\u5834\u6240\u3067\u306f\u901a\u5e38\u3001\u5185\u90e8\u306b\u767a\u706b\u6e90\u3092\u5099\u3048\u305f\u9632\u7206\u69cb\u9020\u306e\u7b50\u4f53\u304c\u5fc5\u8981\u3068\u306a\u308b\u3002\u3053\u306e\u3088\u3046\u306a\u72b6\u6cc1\u3067\u306f\u3001\u6a19\u6e96\u7684\u306a\u5c4b\u5185\u7528\u7b50\u4f53\u306f\u3059\u3050\u306b\u6545\u969c\u3057\u3001\u5b89\u5168\u4e0a\u306e\u30ea\u30b9\u30af\u304c\u5927\u304d\u3059\u304e\u308b\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Do_Not_Compromise_Fire_Safety_Requirements\"><\/span><strong><b>\u706b\u707d\u5b89\u5168\u8981\u4ef6\u3092\u6c7a\u3057\u3066\u59a5\u5354\u3057\u306a\u3044\u3067\u304f\u3060\u3055\u3044<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306f\u3001\u9069\u5207\u306b\u8a2d\u7f6e\u3059\u308c\u3070\u30a2\u30fc\u30af\u653e\u96fb\u3084\u706b\u82b1\u3092\u767a\u751f\u3055\u305b\u3001\u53ef\u71c3\u6027\u7269\u8cea\u306e\u706b\u707d\u3092\u9632\u304e\u307e\u3059\u3002\u8cab\u901a\u3059\u308b\u8010\u706b\u6027\u90e8\u54c1\u306b\u306f\u3001\u7279\u5225\u306a\u914d\u616e\u304c\u5fc5\u8981\u3067\u3059\u3002\u8010\u706b\u6027\u306e\u58c1\u3084\u5929\u4e95\u306b\u306f\u3001\u30d1\u30c6\u30d1\u30c3\u30c9\u3084\u30b7\u30fc\u30e9\u30f3\u30c8\u304c\u5fc5\u8981\u306b\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u7269\u8cea\u306f\u3001\u30dc\u30c3\u30af\u30b9\u5316\u5f8c\u306b\u30a2\u30bb\u30f3\u30d6\u30ea\u306e\u8010\u706b\u6027\u3092\u56de\u5fa9\u3055\u305b\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u8981\u4ef6\u3092\u6c7a\u3057\u3066\u5fd8\u308c\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3002\u706b\u707d\u5b89\u5168\u5bfe\u7b56\u306f\u3001\u691c\u67fb\u5f8c\u3082\u9577\u671f\u9593\u306b\u308f\u305f\u3063\u3066\u4eba\u547d\u3068\u8ca1\u7523\u3092\u5b88\u308a\u307e\u3059\u3002.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Common_Electrical_Junction_Box_Mistakes_to_Avoid\"><\/span><strong><b>\u96fb\u6c17\u63a5\u7d9a\u7bb1\u3067\u3088\u304f\u3042\u308b\u9593\u9055\u3044\u3092\u907f\u3051\u308b\u65b9\u6cd5<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Overcrowding_Wires\"><\/span><strong><b>\u914d\u7dda\u306e\u904e\u5bc6\u72b6\u614b<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u914d\u7dda\u30dc\u30c3\u30af\u30b9\u306b\u914d\u7dda\u3092\u8a70\u3081\u8fbc\u307f\u3059\u304e\u308b\u3068\u554f\u984c\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u71b1\u304c\u767a\u751f\u3057\u3001\u8a2d\u7f6e\u4e2d\u306b\u7d76\u7e01\u6750\u304c\u640d\u50b7\u3059\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u5c06\u6765\u7684\u306b\u554f\u984c\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306e\u4fee\u7406\u3082\u975e\u5e38\u306b\u56f0\u96e3\u306b\u306a\u308a\u307e\u3059\u3002\u914d\u7dda\u4f5c\u696d\u3092\u958b\u59cb\u3059\u308b\u524d\u306b\u3001\u5fc5\u305a\u30dc\u30c3\u30af\u30b9\u306e\u5145\u586b\u91cf\u3092\u898b\u7a4d\u3082\u3063\u3066\u304f\u3060\u3055\u3044\u3002\u30dc\u30c3\u30af\u30b9\u304c\u5c0f\u3055\u3059\u304e\u308b\u5834\u5408\u306f\u3001\u30ef\u30f3\u30b5\u30a4\u30ba\u4e0a\u306e\u30dc\u30c3\u30af\u30b9\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-46545\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/03\/Junction-Box-Used-for-Electrical-Safety.jpg\" alt=\"\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/03\/Junction-Box-Used-for-Electrical-Safety.jpg 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/03\/Junction-Box-Used-for-Electrical-Safety-150x84.jpg 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/03\/Junction-Box-Used-for-Electrical-Safety-768x432.jpg 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/03\/Junction-Box-Used-for-Electrical-Safety-18x10.jpg 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Hidden_or_Buried_Boxes\"><\/span><strong><b>\u96a0\u3055\u308c\u305f\u7bb1\u307e\u305f\u306f\u57cb\u3082\u308c\u305f\u7bb1<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u63a5\u7d9a\u7bb1\u3092\u77f3\u818f\u30dc\u30fc\u30c9\u3001\u6728\u6750\u3001\u30bf\u30a4\u30eb\u306a\u3069\u3067\u8986\u3046\u306e\u306f\u7d76\u5bfe\u306b\u907f\u3051\u308b\u3079\u304d\u3067\u3059\u3002\u58c1\u304c\u5b8c\u6210\u3057\u3066\u3057\u307e\u3046\u3068\u3001\u305d\u306e\u63a5\u7d9a\u7bb1\u306f\u4e8c\u5ea6\u3068\u5229\u7528\u3067\u304d\u306a\u304f\u306a\u308a\u307e\u3059\u3002\u5c06\u6765\u3001\u5bb6\u3092\u8cfc\u5165\u3059\u308b\u4eba\u3084\u96fb\u6c17\u5de5\u4e8b\u58eb\u3068\u3057\u3066\u50cd\u304f\u4eba\u306f\u3001\u63a5\u7d9a\u7b87\u6240\u304c\u898b\u3064\u304b\u3089\u306a\u304b\u3063\u305f\u308a\u3001\u624b\u304c\u5c4a\u304b\u306a\u304b\u3063\u305f\u308a\u3059\u308b\u3068\u3001\u304d\u3063\u3068\u3042\u306a\u305f\u306b\u8179\u3092\u7acb\u3066\u308b\u3067\u3057\u3087\u3046\u3002\u63a5\u7d9a\u7bb1\u306f\u5e38\u306b\u7c21\u5358\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u5834\u6240\u306b\u8a2d\u7f6e\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Missing_Covers\"><\/span><strong><b>\u8868\u7d19\u304c\u6b20\u843d\u3057\u3066\u3044\u308b<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u4f5c\u696d\u73fe\u5834\u306b\u30dc\u30c3\u30af\u30b9\u3092\u958b\u3051\u305f\u307e\u307e\u653e\u7f6e\u3059\u308b\u306e\u306f\u5371\u967a\u3067\u3042\u308a\u3001\u30d7\u30ed\u610f\u8b58\u306b\u6b20\u3051\u308b\u884c\u70ba\u3067\u3059\u3002\u901a\u96fb\u4e2d\u306e\u7aef\u5b50\u306b\u8aa4\u3063\u3066\u89e6\u308c\u3066\u3057\u307e\u3046\u5371\u967a\u6027\u304c\u3042\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u63a5\u7d9a\u90e8\u306b\u57c3\u3084\u866b\u3001\u305d\u306e\u4ed6\u306e\u30b4\u30df\u304c\u5165\u308a\u8fbc\u307f\u3001\u6c5a\u308c\u306e\u539f\u56e0\u3068\u306a\u308a\u307e\u3059\u3002\u4f5c\u696d\u7d42\u4e86\u5f8c\u306f\u5fc5\u305a\u30ab\u30d0\u30fc\u3092\u9589\u3081\u308b\u3088\u3046\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Poor_Grounding\"><\/span><strong><b>\u63a5\u5730\u4e0d\u826f<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u91d1\u5c5e\u88fd\u306e\u7bb1\u3092\u63a5\u5730\u3057\u5fd8\u308c\u308b\u3068\u3001\u767a\u706b\u306e\u5371\u967a\u6027\u304c\u9ad8\u307e\u308a\u307e\u3059\u3002\u6d3b\u7dda\u304c\u7bb1\u306b\u30b7\u30e7\u30fc\u30c8\u3059\u308b\u3068\u3001\u7bb1\u5168\u4f53\u304c\u5e2f\u96fb\u3057\u3001\u63a5\u5730\u3067\u304d\u306a\u304f\u306a\u308a\u307e\u3059\u3002\u7dd1\u8272\u306e\u63a5\u5730\u30af\u30ea\u30c3\u30d7\u307e\u305f\u306f\u30cd\u30b8\u3092\u6240\u5b9a\u306e\u4f4d\u7f6e\u306b\u53d6\u308a\u4ed8\u3051\u308b\u306e\u306b\u3001\u5c11\u3057\u6642\u9593\u3092\u304b\u3051\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Using_Wrong_Box_Type\"><\/span><strong><b>\u9593\u9055\u3063\u305f\u30dc\u30c3\u30af\u30b9\u30bf\u30a4\u30d7\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u5929\u4e95\u6247\u98a8\u6a5f\u7528\u306e\u6a19\u6e96\u7684\u306a\u30dc\u30c3\u30af\u30b9\u3092\u53d6\u308a\u4ed8\u3051\u305f\u308a\u3001\u5c4b\u5185\u7528\u306e\u30dc\u30c3\u30af\u30b9\u3092\u5c4b\u5916\u306b\u4f7f\u7528\u3057\u305f\u308a\u3059\u308b\u306e\u306f\u3001\u521d\u5fc3\u8005\u304c\u3088\u304f\u72af\u3059\u9593\u9055\u3044\u3067\u3059\u3002\u9593\u9055\u3063\u305f\u30dc\u30c3\u30af\u30b9\u3092\u9078\u3076\u3068\u3001\u81ea\u52d5\u7684\u306b\u7834\u640d\u3057\u305f\u308a\u3001\u6c34\u304c\u6d78\u5165\u3057\u305f\u308a\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u8a2d\u7f6e\u3059\u308b\u524d\u306b\u3001\u5fc5\u305a\u30dc\u30c3\u30af\u30b9\u304c\u6b63\u3057\u3044\u7528\u9014\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Loose_Mounting\"><\/span><strong><b>\u7de9\u3044\u53d6\u308a\u4ed8\u3051<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u30b3\u30fc\u30c9\u3092\u5dee\u3057\u8fbc\u3093\u3060\u308a\u84cb\u3092\u958b\u3051\u305f\u308a\u3057\u305f\u969b\u306b\u52d5\u304f\u30dc\u30c3\u30af\u30b9\u306f\u3001\u4f5c\u308a\u304c\u826f\u304f\u3042\u308a\u307e\u305b\u3093\u3002\u52d5\u304d\u56de\u308b\u3068\u3001\u96fb\u7dda\u306e\u88ab\u8986\u304c\u640d\u50b7\u3057\u305f\u308a\u3001\u63a5\u7d9a\u304c\u5207\u308c\u305f\u308a\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u30dc\u30c3\u30af\u30b9\u306f\u5efa\u7269\u306b\u3057\u3063\u304b\u308a\u3068\u56fa\u5b9a\u3057\u3001\u4f55\u5341\u5e74\u3082\u305d\u306e\u5834\u6240\u306b\u7559\u307e\u308b\u3088\u3046\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Electrical_Junction_Box_Installation_Best_Practices\"><\/span><strong><b>\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u8a2d\u7f6e\u306b\u95a2\u3059\u308b\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-49443\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-4.jpg\" alt=\"\u96fb\u6c17\u63a5\u7d9a\u7bb1\uff084\uff09\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-4.jpg 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-4-150x84.jpg 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-4-768x432.jpg 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-4-18x10.jpg 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Plan_Box_Placement_before_Wiring\"><\/span><strong><b>\u914d\u7dda\u524d\u306b\u30dc\u30c3\u30af\u30b9\u306e\u914d\u7f6e\u3092\u8a08\u753b\u3059\u308b<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u30b9\u30a4\u30c3\u30c1\u3001\u30b3\u30f3\u30bb\u30f3\u30c8\u3001\u63a5\u7d9a\u7b87\u6240\u3092\u3069\u3053\u306b\u8a2d\u7f6e\u3059\u308b\u304b\u3001\u4e8b\u524d\u306b\u8a08\u753b\u3092\u7acb\u3066\u307e\u3057\u3087\u3046\u3002\u914d\u7dda\u4f5c\u696d\u3092\u59cb\u3081\u308b\u524d\u306b\u3001\u9593\u67f1\u306e\u4f4d\u7f6e\u3068\u30dc\u30c3\u30af\u30b9\u306e\u9ad8\u3055\u3092\u30de\u30fc\u30af\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002\u5c11\u3057\u8a08\u753b\u3092\u7acb\u3066\u308b\u3060\u3051\u3067\u3001\u6642\u9593\u3068\u624b\u9593\u3092\u5927\u5e45\u306b\u7bc0\u7d04\u3067\u304d\u3001\u30dc\u30c3\u30af\u30b9\u3092\u5fc5\u8981\u306a\u5834\u6240\u306b\u8a2d\u7f6e\u3067\u304d\u307e\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Label_Circuits_Clearly\"><\/span><strong><b>\u56de\u8def\u306b\u306f\u660e\u78ba\u306a\u30e9\u30d9\u30eb\u3092\u8cbc\u308b<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u63a5\u7d9a\u7bb1\u306e\u30ab\u30d0\u30fc\u306e\u5185\u5074\u306b\u30e9\u30d9\u30eb\u3092\u8cbc\u308b\u3053\u3068\u306f\u3001\u305f\u3068\u3048\u898f\u5b9a\u3067\u7fa9\u52d9\u4ed8\u3051\u3089\u308c\u3066\u3044\u306a\u304f\u3066\u3082\u3001\u9577\u671f\u7684\u306b\u306f\u826f\u3044\u30a2\u30a4\u30c7\u30a2\u3067\u3059\u3002\u3069\u306e\u56de\u8def\u306b\u63a5\u7d9a\u3055\u308c\u3066\u3044\u308b\u304b\u3001\u3042\u308b\u3044\u306f\u4f55\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u793a\u3059\u7c21\u5358\u306a\u30e1\u30e2\u304c\u3042\u308c\u3070\u3001\u65b0\u4eba\u4f5c\u696d\u54e1\u304c\u63a8\u6e2c\u3059\u308b\u3053\u3068\u306a\u304f\u3001\u554f\u984c\u3092\u3088\u308a\u8fc5\u901f\u306b\u89e3\u6c7a\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Leave_Extra_Wire_Length\"><\/span><strong><b>\u4f59\u5206\u306a\u9577\u3055\u306e\u30ef\u30a4\u30e4\u30fc\u3092\u6b8b\u3057\u3066\u304a\u304f<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u898f\u5b9a\u3067\u306f6\u30a4\u30f3\u30c1\uff08\u7d0415cm\uff09\u306e\u4f59\u88d5\u3092\u6301\u305f\u305b\u308b\u3088\u3046\u306b\u3068\u3042\u308a\u307e\u3059\u304c\u3001\u5c11\u3057\u9577\u3081\u306b\u6b8b\u3057\u3066\u304a\u304f\u306e\u304c\u8ce2\u660e\u3067\u3059\u3002\u9577\u3044\u96fb\u7dda\u306e\u65b9\u304c\u63a5\u7d9a\u4f5c\u696d\u304c\u3057\u3084\u3059\u304f\u3001\u5f8c\u3067\u7834\u640d\u3057\u305f\u7d76\u7e01\u4f53\u3092\u53d6\u308a\u9664\u304f\u5fc5\u8981\u304c\u751f\u3058\u305f\u5834\u5408\u3067\u3082\u4f5c\u696d\u30b9\u30da\u30fc\u30b9\u3092\u78ba\u4fdd\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u30dc\u30c3\u30af\u30b9\u304c\u3044\u3063\u3071\u3044\u306b\u306a\u308a\u3059\u304e\u306a\u3044\u3088\u3046\u306b\u3001\u9577\u3081\u306b\u6b8b\u3057\u3059\u304e\u306a\u3044\u3088\u3046\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Use_High-Quality_Enclosures\"><\/span><strong><b>\u9ad8\u54c1\u8cea\u306e\u7b50\u4f53\u3092\u4f7f\u7528\u3059\u308b<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u5b89\u4fa1\u306a\u7bb1\u306f\u3001\u66f2\u304c\u3063\u305f\u308a\u3001\u58ca\u308c\u305f\u308a\u3001\u30cd\u30b8\u7a74\u304c\u304d\u3061\u3093\u3068\u5408\u308f\u306a\u304b\u3063\u305f\u308a\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002KDM Steel\u306e\u3088\u3046\u306a\u8a55\u5224\u306e\u826f\u3044\u4f1a\u793e\u304b\u3089\u826f\u8cea\u306a\u30b3\u30f3\u30c6\u30ca\u3092\u8cfc\u5165\u3059\u308c\u3070\u3001\u8a2d\u7f6e\u6642\u306f\u3082\u3061\u308d\u3093\u3001\u5efa\u7269\u304c\u5b58\u7d9a\u3059\u308b\u9650\u308a\u3001\u7bb1\u306f\u9577\u6301\u3061\u3057\u307e\u3059\u3002\u54c1\u8cea\u306f\u91cd\u8981\u3067\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Follow_Manufacturer_Instructions\"><\/span><strong><b>\u88fd\u9020\u5143\u306e\u6307\u793a\u306b\u5f93\u3063\u3066\u304f\u3060\u3055\u3044<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u3059\u3079\u3066\u306e\u63a5\u7d9a\u7bb1\u306b\u306f\u3001\u30e1\u30fc\u30ab\u30fc\u304b\u3089\u306e\u53d6\u308a\u4ed8\u3051\u65b9\u6cd5\u3001\u5bb9\u91cf\uff08\u7acb\u65b9\u30a4\u30f3\u30c1\uff09\u3001\u7528\u9014\u306a\u3069\u304c\u8a18\u8f09\u3055\u308c\u305f\u8aac\u660e\u66f8\u304c\u4ed8\u5c5e\u3057\u3066\u3044\u307e\u3059\u3002\u5fc5\u305a\u304a\u8aad\u307f\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u3089\u306e\u624b\u9806\u306b\u5f93\u3046\u3053\u3068\u3067\u3001\u898f\u5b9a\u3092\u9075\u5b88\u3057\u3001\u63a5\u7d9a\u7bb1\u304c\u6b63\u3057\u304f\u6a5f\u80fd\u3059\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><strong><b>\u7d50\u8ad6<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u719f\u7df4\u3057\u305f\u8a2d\u7f6e\u696d\u8005\u3067\u3042\u308c\u3070\u3001\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306b\u95a2\u3059\u308b\u898f\u5247\u3092\u719f\u77e5\u3057\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002NEC\uff08\u7c73\u56fd\u96fb\u6c17\u5de5\u4e8b\u898f\u7a0b\uff09\u306e\u898f\u5247\u306b\u5f93\u3044\u3001KDM Steel\u306e\u3088\u3046\u306a\u4fe1\u983c\u3067\u304d\u308b\u4f01\u696d\u304b\u3089\u826f\u8cea\u306a\u7b50\u4f53\u3092\u8cfc\u5165\u3059\u308b\u3053\u3068\u3067\u3001\u30b7\u30b9\u30c6\u30e0\u306e\u5b89\u5168\u6027\u3001\u6cd5\u4ee4\u9075\u5b88\u3001\u305d\u3057\u3066\u8010\u4e45\u6027\u3092\u78ba\u4fdd\u3067\u304d\u307e\u3059\u3002. <a href=\"https:\/\/www.kdmsteel.com\/ja\/\">KDM\u30b9\u30c1\u30fc\u30eb<\/a>\u00a0\u9811\u4e08\u306a\u7523\u696d\u7528\u30dc\u30c3\u30af\u30b9\u304b\u3089\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u30d3\u30b8\u30cd\u30b9\u7528\u7b50\u4f53\u307e\u3067\u3001\u304a\u5ba2\u69d8\u304c\u5fc5\u8981\u3068\u3059\u308b\u3042\u3089\u3086\u308b\u30cb\u30fc\u30ba\u306b\u5bfe\u5fdc\u3059\u308b\u3001\u8010\u4e45\u6027\u3068\u898f\u683c\u306b\u6e96\u62e0\u3057\u305f\u8a2d\u8a08\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002. <a href=\"https:\/\/www.kdmsteel.com\/ja\/\u63a5\u89e6\/\"><strong><b>\u304a\u554f\u3044\u5408\u308f\u305b<\/b><\/strong><\/a>\u00a0\u4eca\u3059\u3050\u3042\u306a\u305f\u3060\u3051\u306e\u898b\u7a4d\u3082\u308a\u3092\u624b\u306b\u5165\u308c\u307e\u3057\u3087\u3046\u3002.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQs\"><\/span><strong><b>\u3088\u304f\u3042\u308b\u8cea\u554f<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-50318\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-1.jpg\" alt=\"\u96fb\u6c17\u63a5\u7d9a\u7bb1\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-1.jpg 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-1-150x84.jpg 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-1-768x432.jpg 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/03\/Electrical-Junction-Box-1-18x10.jpg 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Can_you_legally_hide_a_junction_box_behind_drywall_or_ceiling\"><\/span><strong><b>\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u3092\u77f3\u818f\u30dc\u30fc\u30c9\u3084\u5929\u4e95\u306e\u88cf\u306b\u96a0\u3059\u3053\u3068\u306f\u5408\u6cd5\u3067\u3059\u304b\uff1f<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u7d76\u5bfe\u306b\u30c0\u30e1\u3067\u3059\u3002NEC 314.29\u306b\u3088\u308b\u3068\u3001\u3059\u3079\u3066\u306e\u63a5\u7d9a\u7bb1\u306f\u3001\u5efa\u7269\u306e\u69cb\u9020\u3092\u89e3\u4f53\u3059\u308b\u3053\u3068\u306a\u304f\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u5834\u6240\u306b\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_many_wires_are_allowed_inside_a_junction_box\"><\/span><strong><b>\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u5185\u306b\u306f\u4f55\u672c\u306e\u96fb\u7dda\u3092\u53ce\u5bb9\u3067\u304d\u307e\u3059\u304b\uff1f<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>NEC 314.16\u306e\u8a08\u7b97\u306b\u3088\u308b\u3068\u3001\u5fc5\u8981\u306a\u5bb9\u91cf\u306f\u30dc\u30c3\u30af\u30b9\u306e\u5bb9\u7a4d\uff08\u7acb\u65b9\u30a4\u30f3\u30c1\uff09\u3068\u96fb\u7dda\u306e\u592a\u3055\u306b\u3088\u3063\u3066\u7570\u306a\u308a\u307e\u3059\u3002\u30dc\u30c3\u30af\u30b9\u306e\u523b\u5370\u30b5\u30a4\u30ba\u3068\u3001\u5404\u5c0e\u4f53\u3001\u6a5f\u5668\u3001\u304a\u3088\u3073\u7d99\u624b\u306e\u30b5\u30a4\u30ba\u3092\u6bd4\u8f03\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Do_all_junction_boxes_need_a_cover\"><\/span><strong><b>\u3059\u3079\u3066\u306e\u63a5\u7d9a\u7bb1\u306b\u30ab\u30d0\u30fc\u304c\u5fc5\u8981\u3067\u3059\u304b\uff1f<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>NEC 314.25\u306b\u3088\u308b\u3068\u3001\u3059\u3079\u3066\u306e\u56de\u8def\u30dc\u30c3\u30af\u30b9\u306b\u306f\u30ab\u30d0\u30fc\u304c\u5fc5\u8981\u3067\u3059\u3002\u30ab\u30d0\u30fc\u306f\u7570\u7269\u306e\u4fb5\u5165\u3092\u9632\u304e\u3001\u706b\u82b1\u306e\u767a\u751f\u3092\u6291\u5236\u3057\u3001\u5076\u767a\u7684\u306a\u63a5\u89e6\u3092\u9632\u304e\u307e\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Are_plastic_junction_boxes_safer_than_metal_ones\"><\/span><strong><b>\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u88fd\u306e\u63a5\u7d9a\u7bb1\u306f\u91d1\u5c5e\u88fd\u306e\u3082\u306e\u3088\u308a\u5b89\u5168\u306a\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u3069\u3061\u3089\u304c\u5fc5\u305a\u3057\u3082\u5b89\u5168\u3068\u3044\u3046\u308f\u3051\u3067\u306f\u306a\u304f\u3001\u7528\u9014\u304c\u7570\u306a\u308b\u3060\u3051\u3067\u3059\u3002\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u88fd\u306e\u30dc\u30c3\u30af\u30b9\u306f\u96fb\u6c17\u3092\u901a\u3055\u306a\u3044\u305f\u3081\u3001\u5bb6\u5ead\u3067\u306e\u4f7f\u7528\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002\u4e00\u65b9\u3001\u91d1\u5c5e\u88fd\u306e\u30dc\u30c3\u30af\u30b9\u306f\u5f37\u5ea6\u304c\u9ad8\u304f\u3001\u30d3\u30b8\u30cd\u30b9\u3084\u7523\u696d\u7528\u9014\u306b\u304a\u3051\u308b\u63a5\u5730\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_are_the_clearance_requirements_around_junction_boxes\"><\/span><strong><b>\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u5468\u8fba\u306e\u30af\u30ea\u30a2\u30e9\u30f3\u30b9\u8981\u4ef6\u306f\u4f55\u3067\u3059\u304b\uff1f<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>NEC 314.29\u3067\u306f\u3001\u30a2\u30af\u30bb\u30b9\u6027\u304c\u6700\u3082\u91cd\u8981\u3067\u3042\u308b\u3068\u898f\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30ab\u30d0\u30fc\u306f\u4fee\u7406\u3092\u5fc5\u8981\u3068\u305b\u305a\u306b\u958b\u3051\u3089\u308c\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002NEC 110.26\u306b\u306f\u3001\u5927\u578b\u7b50\u4f53\u5185\u306e\u4f5c\u696d\u30a8\u30ea\u30a2\u306b\u95a2\u3059\u308b\u5177\u4f53\u7684\u306a\u5bfe\u7b56\u304c\u5b9a\u3081\u3089\u308c\u3066\u3044\u307e\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_labeling_required_inside_junction_boxes\"><\/span><strong><b>\u63a5\u7d9a\u7bb1\u5185\u90e8\u3078\u306e\u30e9\u30d9\u30eb\u8cbc\u4ed8\u306f\u5fc5\u8981\u3067\u3059\u304b\uff1f<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u901a\u5e38\u306e\u63a5\u7d9a\u7bb1\u5185\u3067\u306f\u3001NEC\uff08\u7c73\u56fd\u96fb\u6c17\u5de5\u4e8b\u898f\u7a0b\uff09\u306f\u5fc5\u305a\u3057\u3082\u914d\u7dda\u306e\u30e9\u30d9\u30eb\u8868\u793a\u3092\u7fa9\u52d9\u4ed8\u3051\u3066\u3044\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001\u914d\u7dda\u306b\u30e9\u30d9\u30eb\u3092\u4ed8\u3051\u308b\u3053\u3068\u306f\u3001\u5c06\u6765\u306e\u96fb\u6c17\u5de5\u4e8b\u58eb\u306e\u6642\u9593\u3068\u52b4\u529b\u3092\u7bc0\u7d04\u3059\u308b\u4e0a\u3067\u975e\u5e38\u306b\u6709\u52b9\u306a\u65b9\u6cd5\u3067\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_is_the_difference_between_a_junction_box_and_an_outlet_box\"><\/span><strong><b>\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u3068\u30a2\u30a6\u30c8\u30ec\u30c3\u30c8\u30dc\u30c3\u30af\u30b9\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306f\u914d\u7dda\u3092\u63a5\u7d9a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u3001\u30a2\u30a6\u30c8\u30ec\u30c3\u30c8\u30dc\u30c3\u30af\u30b9\u306f\u30b9\u30a4\u30c3\u30c1\u3084\u30b3\u30f3\u30bb\u30f3\u30c8\u306a\u3069\u306e\u6a5f\u5668\u3092\u53ce\u7d0d\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u5b9f\u969b\u306b\u306f\u3001\u3053\u308c\u3089\u306e\u7528\u8a9e\u306f\u540c\u3058\u3082\u306e\u3092\u6307\u3059\u3053\u3068\u304c\u591a\u304f\u3001\u307b\u3068\u3093\u3069\u306e\u30dc\u30c3\u30af\u30b9\u306f\u4e21\u65b9\u306e\u6a5f\u80fd\u3092\u5099\u3048\u3066\u3044\u307e\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_you_reuse_an_old_junction_box_during_renovations\"><\/span><strong><b>\u6539\u4fee\u5de5\u4e8b\u306e\u969b\u306b\u3001\u53e4\u3044\u63a5\u7d9a\u7bb1\u3092\u518d\u5229\u7528\u3067\u304d\u307e\u3059\u304b\uff1f<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u306f\u3044\u3001\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u304c\u826f\u597d\u306a\u72b6\u614b\u3067\u3042\u308a\u3001\u3072\u3073\u5272\u308c\u3084\u305d\u306e\u4ed6\u306e\u640d\u50b7\u304c\u306a\u3044\u5834\u5408\u306f\u3001\u518d\u5229\u7528\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u65b0\u3057\u3044\u914d\u7dda\u306b\u5bfe\u5fdc\u3067\u304d\u308b\u3053\u3068\u3001\u304a\u3088\u3073\u3059\u3079\u3066\u306e\u63a5\u5730\u63a5\u7d9a\u304c\u6b63\u5e38\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Are_junction_boxes_required_in_industrial_installations\"><\/span><strong><b>\u7523\u696d\u8a2d\u5099\u306b\u304a\u3044\u3066\u3001\u63a5\u7d9a\u7bb1\u306f\u5fc5\u8981\u3067\u3059\u304b\uff1f<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u306f\u3044\u3001\u5b89\u5168\u898f\u5247\u3084\u74b0\u5883\u3078\u306e\u914d\u616e\u304b\u3089\u3001\u5de5\u696d\u7528\u5730\u3067\u306f\u3055\u3089\u306b\u53b3\u3057\u3044\u57fa\u6e96\u304c\u9069\u7528\u3055\u308c\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002\u4f5c\u696d\u5834\u306a\u3069\u306e\u904e\u9177\u306a\u74b0\u5883\u3067\u306f\u3001\u4f01\u696d\u88fd\u306e\u9811\u4e08\u306a\u7b50\u4f53\u304c\u3088\u304f\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002.<\/p>","protected":false},"excerpt":{"rendered":"<p>Have you ever had an electrical test fail because of a mistake in a junction box that did not seem important? You are not alone. It can be hard to find your way around the National Electrical Code (NEC), but following the rules for junction boxes is necessary for safety and compliance. This guide breaks [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":50318,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"disabled","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-50307","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Top Electrical Junction Box Rules You Must Follow for Safety &amp; Compliance - KDM Steel<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u63a5\u7d9a\u7bb1\u306e\u30c8\u30c3\u30d7\u30eb\u30fc\u30eb\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Top Electrical Junction Box Rules You Must Follow for Safety &amp; Compliance - KDM Steel\" \/>\n<meta property=\"og:description\" content=\"Have you ever had an electrical test fail because of a mistake in a junction box that did not seem important? You are not alone. It can be hard to find your way around the National Electrical Code (NEC), but following the rules for junction boxes is necessary for safety and compliance. 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