{"id":47499,"date":"2025-12-25T08:20:18","date_gmt":"2025-12-25T08:20:18","guid":{"rendered":"https:\/\/www.kdmsteel.com\/?p=47499"},"modified":"2025-12-25T08:20:18","modified_gmt":"2025-12-25T08:20:18","slug":"junction-box-nec-code-standards","status":"publish","type":"post","link":"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/","title":{"rendered":"\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306eNEC\u898f\u683c"},"content":{"rendered":"<p>\u7c73\u56fd\u306b\u304a\u3051\u308b\u96fb\u6c17\u8a2d\u5099\u306e\u6700\u4f4e\u9650\u306e\u5b89\u5168\u57fa\u6e96\u3067\u3042\u308bNEC\uff08\u7c73\u56fd\u96fb\u6c17\u5de5\u4e8b\u898f\u7a0b\uff09\u306f\u3001\u3042\u3089\u3086\u308b\u7523\u696d\u306b\u5bfe\u3057\u3066\u5305\u62ec\u7684\u306a\u6307\u91dd\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002NEC\u3067\u306f\u5177\u4f53\u7684\u306b\u3069\u306e\u3088\u3046\u306a\u96fb\u6c17\u898f\u683c\u304c\u898f\u5b9a\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u3092\u4f7f\u7528\u3057\u3066\u5efa\u7269\u306b\u96fb\u6c17\u914d\u7dda\u30b7\u30b9\u30c6\u30e0\u3092\u8a2d\u7f6e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u3053\u306e\u8a18\u4e8b\u3067\u9075\u5b88\u3059\u3079\u304dNEC\u306e\u8981\u4ef6\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\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\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#What_is_the_NEC_Code\" >NEC\u30b3\u30fc\u30c9\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\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#How_NEC_is_Updated_and_Maintained\" >NEC\u306e\u66f4\u65b0\u3068\u4fdd\u5b88\u65b9\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#NEC_Requirements_for_Junction_Boxes_and_Enclosures\" >\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u304a\u3088\u3073\u30a8\u30f3\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u306b\u95a2\u3059\u308bNEC\uff08\u7c73\u56fd\u96fb\u6c17\u5de5\u4e8b\u898f\u7a0b\uff09\u306e\u8981\u4ef6<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#NEC_31428%E2%80%94Junction_Box_Material\" >NEC 314.28\u2014\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u6750\u6599<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#Material_Requirements\" >\u6750\u6599\u8981\u4ef6<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#IP_Rating_Requirements\" >IP\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u8981\u4ef6<\/a><\/li><\/ul><\/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\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#NEC_31416%E2%80%94Volume_Size_of_the_Junction_Box\" >NEC 314.16\u2014\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u5bb9\u7a4d<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#Method_of_Determining_the_Correct_Volume\" >\u6b63\u3057\u3044\u4f53\u7a4d\u3092\u6c7a\u5b9a\u3059\u308b\u65b9\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#Box_Fill_Requirements\" >\u7bb1\u8a70\u3081\u8981\u4ef6<\/a><\/li><\/ul><\/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\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#NEC_370-29%E2%80%94Junction_Boxes_in_Hazardous_Locations\" >NEC 370-29\u2014\u5371\u967a\u5834\u6240\u306b\u304a\u3051\u308b\u63a5\u7d9a\u7bb1<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#Special_Requirements_for_Hazardous_Areas\" >\u5371\u967a\u533a\u57df\u306b\u304a\u3051\u308b\u7279\u5225\u306a\u8981\u4ef6<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#Installation_Restrictions\" >\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u306b\u95a2\u3059\u308b\u5236\u9650\u4e8b\u9805<\/a><\/li><\/ul><\/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\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#NEC_31429%E2%80%94Junction_Box_in_Non-Hazardous_Locations\" >NEC 314.29\u2014\u975e\u5371\u967a\u5834\u6240\u306b\u304a\u3051\u308b\u63a5\u7d9a\u7bb1<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#NEC_Requirements\" >NEC\u306e\u8981\u4ef6<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#Cover_Requirements\" >\u30ab\u30d0\u30fc\u8981\u4ef6<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#NEC_250110%E2%80%94Grounding_Requirements\" >NEC 250.110\u2014\u63a5\u5730\u8981\u4ef6<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#Grounding_for_Metal_Junction_Boxes\" >\u91d1\u5c5e\u88fd\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u63a5\u5730<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#Grounding_for_Non-Metallic_Junction_Boxes\" >\u975e\u91d1\u5c5e\u88fd\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u63a5\u5730<\/a><\/li><\/ul><\/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\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#NEC_11026-Clearance_Requirements\" >NEC 110.26 - \u30af\u30ea\u30a2\u30e9\u30f3\u30b9\u8981\u4ef6<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#Clearance_Operation_Requirements\" >\u30af\u30ea\u30a2\u30e9\u30f3\u30b9\u4f5c\u696d\u8981\u4ef6<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#Accessibility_Rules\" >\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u30eb\u30fc\u30eb<\/a><\/li><\/ul><\/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\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#How_to_Avoid_Common_NEC_Violations\" >\u3088\u304f\u3042\u308bNEC\u9055\u53cd\u3092\u56de\u907f\u3059\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-23\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#Junction_Box_Overload\" >\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u904e\u8ca0\u8377<\/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\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#Improper_Equipment_Wiring\" >\u4e0d\u9069\u5207\u306a\u6a5f\u5668\u914d\u7dda<\/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\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#Using_the_Incorrect_Type_of_Junction_Box\" >\u4e0d\u9069\u5207\u306a\u30bf\u30a4\u30d7\u306e\u63a5\u7d9a\u7bb1\u306e\u4f7f\u7528<\/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\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#Excessive_Filling_of_Conduit_or_Cable_Trays\" >\u96fb\u7dda\u7ba1\u307e\u305f\u306f\u30b1\u30fc\u30d6\u30eb\u30c8\u30ec\u30a4\u3078\u306e\u904e\u5270\u306a\u5145\u586b<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#FAQ\" >\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-28\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#What_Are_the_Differences_for_Enclosures_Between_NEMA_and_NEC\" >NEMA\u3068NEC\u306e\u7b50\u4f53\u306b\u95a2\u3059\u308b\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-29\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#How_to_Choose_a_Junction_Box_of_the_Appropriate_Volume\" >\u9069\u5207\u306a\u5bb9\u91cf\u306e\u63a5\u7d9a\u7bb1\u306e\u9078\u3073\u65b9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#Is_the_Covering_Junction_Box_Safe_and_Complies_with_NEC_Regulations\" >\u30ab\u30d0\u30fc\u4ed8\u304d\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306f\u5b89\u5168\u3067\u3001NEC\u898f\u683c\u306b\u6e96\u62e0\u3057\u3066\u3044\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-31\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#What_Consequences_can_be_Caused_by_Incorrect_Grounding_of_the_Junction_Box\" >\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u63a5\u5730\u304c\u4e0d\u9069\u5207\u3060\u3068\u3001\u3069\u306e\u3088\u3046\u306a\u5f71\u97ff\u304c\u751f\u3058\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u304b\uff1f<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/#Final_Thought\" >\u6700\u5f8c\u306b<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_is_the_NEC_Code\"><\/span>NEC\u30b3\u30fc\u30c9\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-47504\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/NEC-Code.jpg\" alt=\"NEC\u30b3\u30fc\u30c9\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/NEC-Code.jpg 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/NEC-Code-150x84.jpg 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/NEC-Code-768x432.jpg 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/NEC-Code-18x10.jpg 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u7c73\u56fd\u96fb\u6c17\u5de5\u4e8b\u898f\u7a0b\uff08NEC\uff09\u306f\u3001\u975e\u653f\u5e9c\u7d44\u7e54\u306b\u3088\u3063\u3066\u7b56\u5b9a\u3055\u308c\u305f\u30e2\u30c7\u30eb\u898f\u5236\u6587\u66f8\u3067\u3042\u308a\u3001\u4eba\u547d\u3068\u8ca1\u7523\u306e\u5b89\u5168\u3092\u4fdd\u8a3c\u3059\u308b\u305f\u3081\u306e\u6700\u4f4e\u9650\u306e\u5b89\u5168\u8981\u4ef6\u3092\u5b9a\u3081\u3066\u3044\u307e\u3059\u3002NEC\u306f\u3001\u9069\u5207\u306a\u96fb\u6c17\u914d\u7dda\u306e\u666e\u53ca\u3092\u76ee\u6307\u3057\u3001\u96fb\u6c17\u8a2d\u5099\u304a\u3088\u3073\u6a5f\u5668\u306b\u95a2\u3059\u308b\u5305\u62ec\u7684\u306a\u6307\u91dd\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002NEC\u306f\u3001\u96fb\u6c17\u30b7\u30b9\u30c6\u30e0\u306e\u8a2d\u7f6e\u306b\u304a\u3051\u308b\u5b89\u5168\u5bfe\u7b56\u3092\u8a73\u7d30\u306b\u898f\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u3055\u3089\u306b\u3001\u5b89\u5168\u4e0a\u306e\u6ce8\u610f\u4e8b\u9805\u306b\u3064\u3044\u3066\u3082\u5305\u62ec\u7684\u306a\u30ac\u30a4\u30c0\u30f3\u30b9\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002\u30ac\u30a4\u30c0\u30f3\u30b9\u306e\u5185\u5bb9\u306b\u5f93\u3063\u3066\u6b63\u3057\u304f\u8a2d\u7f6e\u3059\u308b\u3053\u3068\u3067\u3001\u706b\u707d\u3001\u611f\u96fb\u3001\u6545\u969c\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_NEC_is_Updated_and_Maintained\"><\/span>NEC\u306e\u66f4\u65b0\u3068\u4fdd\u5b88\u65b9\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NEC\u30b3\u30fc\u30c9<a href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u30a8\u30f3\u30af\u30ed\u30fc\u30b8\u30e3\/\">\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9<\/a>\u00a0NEC\u81ea\u4f53\u306b\u306f\u6cd5\u7684\u52b9\u529b\u306f\u306a\u3044\u3082\u306e\u306e\u3001\u7c73\u56fd\u306e\u307b\u3068\u3093\u3069\u306e\u5dde\u306f\u3001\u7ba1\u8f44\u533a\u57df\u5185\u306e\u96fb\u6c17\u898f\u5247\u3068\u3057\u3066NEC\u3092\u6cd5\u7684\u6587\u66f8\u3068\u3057\u3066\u63a1\u7528\u3057\u3066\u3044\u308b\u3002NEC\u306e\u53b3\u683c\u306a\u8a18\u8ff0\u3068\u5e45\u5e83\u3044\u9069\u7528\u7bc4\u56f2\u306b\u3088\u308a\u3001NEC\u306f\u56fd\u969b\u7684\u306b\u6700\u3082\u5f71\u97ff\u529b\u306e\u3042\u308b\u96fb\u6c17\u898f\u683c\u3068\u306a\u3063\u3066\u3044\u308b\u3002\u3059\u3067\u306b\u4fdd\u967a\u3084\u53f8\u6cd5\u306e\u57fa\u76e4\u3068\u306a\u3063\u3066\u3044\u308b\u306e\u3082NEC\u3067\u3042\u308b\u3002.<\/p>\n<p>NEC\u306e\u6a29\u5a01\u306e\u5927\u304d\u306a\u5074\u9762\u306e\u4e00\u3064\u306f\u3001\u305d\u306e\u9ad8\u5ea6\u306a\u6280\u8853\u3068\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306b\u3042\u308b\u3002NEC\u306f3\u5e74\u3054\u3068\u306b\u66f4\u65b0\u30fb\u6539\u8a02\u3055\u308c\u3001\u5c02\u9580\u5bb6\u30d1\u30cd\u30eb\u306b\u3088\u308b\u5be9\u67fb\u3092\u7d4c\u3066\u3001\u96fb\u6c17\u8a2d\u5099\u306e\u5b89\u5168\u6027\u3068\u52b9\u7387\u6027\u3092\u5411\u4e0a\u3055\u305b\u3066\u3044\u308b\u3002.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"NEC_Requirements_for_Junction_Boxes_and_Enclosures\"><\/span>\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u304a\u3088\u3073\u30a8\u30f3\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u306b\u95a2\u3059\u308bNEC\uff08\u7c73\u56fd\u96fb\u6c17\u5de5\u4e8b\u898f\u7a0b\uff09\u306e\u8981\u4ef6<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NEC\uff08\u7c73\u56fd\u96fb\u6c17\u5de5\u4e8b\u898f\u7a0b\uff09\u306f\u3001\u9069\u5207\u306a\u96fb\u6c17\u914d\u7dda\u3068\u5b89\u5168\u6027\u3092\u4fdd\u8a3c\u3059\u308b\u305f\u3081\u306b\u3001\u63a5\u7d9a\u7bb1\u306e\u3042\u3089\u3086\u308b\u5074\u9762\u306b\u3064\u3044\u3066\u5177\u4f53\u7684\u306a\u8981\u4ef6\u3092\u5b9a\u3081\u3066\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u3001\u63a5\u7d9a\u7bb1\u306b\u95a2\u3059\u308bNEC\u306e\u5177\u4f53\u7684\u306a\u8981\u4ef6\u306e\u4e00\u90e8\u3067\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"NEC_31428%E2%80%94Junction_Box_Material\"><\/span>NEC 314.28\u2014\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u6750\u6599<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u7b2c314.28\u9805\u3067\u306f\u3001\u63a5\u7d9a\u7bb1\u306e\u6750\u8cea\u9078\u5b9a\u306b\u3064\u3044\u3066\u898f\u5b9a\u3057\u3066\u304a\u308a\u3001\u901a\u5e38\u306f\u91d1\u5c5e\u307e\u305f\u306f\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u88fd\u3067\u3059\u3002\u8a2d\u7f6e\u74b0\u5883\u306b\u57fa\u3065\u3044\u3066\u9069\u5207\u306a\u63a5\u7d9a\u7bb1\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Material_Requirements\"><\/span>\u6750\u6599\u8981\u4ef6<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u88fd\u9020\u306b\u306f\u3001\u901a\u5e38\u3001\u30b9\u30c6\u30f3\u30ec\u30b9\u92fc\u3084PVC\u306a\u3069\u306e\u4e0d\u71c3\u6027\u6750\u6599\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3082\u3061\u308d\u3093\u3001\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u6750\u6599\u3092\u9078\u3076\u969b\u306b\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u4f7f\u7528\u74b0\u5883\u3082\u8003\u616e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u8a2d\u7f6e\u74b0\u5883\u304c\u6e7f\u6c17\u306e\u591a\u3044\u5834\u5408\u3001\u6e7f\u6c17\u304c\u63a5\u7d9a\u7bb1\u306b\u5bb9\u6613\u306b\u6d78\u5165\u3057\u3001\u96fb\u6c17\u7684\u306a\u5b89\u5168\u6027\u3092\u640d\u306a\u3046\u6050\u308c\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u9069\u5207\u306a\u9632\u6e7f\u7b49\u7d1a\u306e\u63a5\u7d9a\u7bb1\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n<p>\u8150\u98df\u6027\u306e\u74b0\u5883\u306b\u8a2d\u7f6e\u3059\u308b\u5834\u5408\u306f\u3001\u91d1\u5c5e\u88fd\u306e\u63a5\u7d9a\u30dc\u30c3\u30af\u30b9\u3092\u9078\u629e\u3067\u304d\u307e\u3059\u3002 <a href=\"https:\/\/www.kdmsteel.com\/ja\/\u96fb\u6c17\u7b50\u4f53\/\u30b9\u30c6\u30f3\u30ec\u30b9\u30b9\u30c1\u30fc\u30eb\u88fd\u96fb\u6c17\u7b50\u4f53\/\">\u30b9\u30c6\u30f3\u30ec\u30b9\u92fc<\/a>\u00a0\u305d\u3057\u3066 <a href=\"https:\/\/www.kdmsteel.com\/ja\/\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u7b50\u4f53\/\">\u30a2\u30eb\u30df\u30cb\u30a6\u30e0<\/a>. \u3053\u306e\u6750\u6599\u306f\u8150\u98df\u7387\u304c\u4f4e\u304f\u3001\u9306\u3073\u3084\u52a3\u5316\u3092\u9632\u304e\u3001\u3088\u308a\u9577\u3044\u8010\u7528\u5e74\u6570\u3092\u78ba\u4fdd\u3067\u304d\u307e\u3059\u3002.<\/p>\n<p>\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u88fd\u306e\u96fb\u6c17\u30dc\u30c3\u30af\u30b9\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u306f\u3001\u7d2b\u5916\u7dda\u3084\u6e7f\u6c17\u306a\u3069\u306e\u904e\u9177\u306a\u74b0\u5883\u6761\u4ef6\u306b\u8010\u3048\u3089\u308c\u308b\u3082\u306e\u3067\u306a\u3051\u308c\u3070\u306a\u3089\u305a\u3001\u96fb\u6c17\u74b0\u5883\u306b\u5408\u308f\u305b\u3066\u53b3\u5bc6\u306b\u8a2d\u8a08\u3055\u308c\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002.<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-47380\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/2_3_4-Gang-Junction-Box.jpg\" alt=\"2_3_4\u9023\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/2_3_4-Gang-Junction-Box.jpg 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/2_3_4-Gang-Junction-Box-150x84.jpg 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/2_3_4-Gang-Junction-Box-768x432.jpg 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/2_3_4-Gang-Junction-Box-18x10.jpg 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<h4><span class=\"ez-toc-section\" id=\"IP_Rating_Requirements\"><\/span>IP\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u8981\u4ef6<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>\u63a5\u7d9a\u7bb1\u306e\u6750\u8cea\u306b\u95a2\u308f\u3089\u305a\u3001NEC\u3067\u306f\u4e00\u5b9a\u306e\u30ec\u30d9\u30eb\u306e <a href=\"https:\/\/www.kdmsteel.com\/ja\/ip-\u30a8\u30f3\u30af\u30ed\u30fc\u30b8\u30e3\/\">\u4fb5\u5165\u4fdd\u8b77\u7b49\u7d1a\uff08IP\uff09<\/a>. IP\u7b49\u7d1a\u306f\u3001\u6e7f\u6c17\u3084\u7c89\u5875\u306b\u5bfe\u3059\u308b\u8010\u6027\u3092\u793a\u3059\u6307\u6a19\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u5c4b\u5916\u3001\u5de5\u5834\u3001\u6e7f\u5ea6\u306e\u9ad8\u3044\u751f\u7523\u74b0\u5883\u306b\u304a\u3051\u308b\u96fb\u6c17\u5b89\u5168\u306b\u3068\u3063\u3066\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"NEC_31416%E2%80%94Volume_Size_of_the_Junction_Box\"><\/span>NEC 314.16\u2014\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u5bb9\u7a4d<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>NEC 314.16\u3067\u306f\u3001\u7570\u306a\u308b\u7a2e\u985e\u306e\u96fb\u7dda\u306e\u63a5\u7d9a\u7bb1\u306b\u5fc5\u8981\u306a\u6700\u5c0f\u5bb9\u7a4d\u306b\u95a2\u3059\u308b\u8a73\u7d30\u306a\u898f\u5247\u304c\u5b9a\u3081\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u6838\u5fc3\u306f\u3001\u904e\u71b1\u3001\u7d76\u7e01\u640d\u50b7\u3001\u307e\u305f\u306f\u904e\u5bc6\u306b\u3088\u308b\u63a5\u7d9a\u4e0d\u826f\u3092\u9632\u3050\u305f\u3081\u306b\u3001\u96fb\u7dda\u3001\u30b3\u30cd\u30af\u30bf\u3001\u304a\u3088\u3073\u6a5f\u5668\u3092\u53ce\u5bb9\u3059\u308b\u306e\u306b\u5341\u5206\u306a\u30b9\u30da\u30fc\u30b9\u3092\u30dc\u30c3\u30af\u30b9\u5185\u306b\u78ba\u4fdd\u3059\u308b\u3053\u3068\u3067\u3059\u3002.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Method_of_Determining_the_Correct_Volume\"><\/span>\u6b63\u3057\u3044\u4f53\u7a4d\u3092\u6c7a\u5b9a\u3059\u308b\u65b9\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>NEC\uff08\u7c73\u56fd\u96fb\u6c17\u5de5\u4e8b\u898f\u7a0b\uff09\u3067\u306f\u3001\u4f53\u7a4d\u306e\u6e2c\u5b9a\u5358\u4f4d\u3068\u3057\u3066\u7acb\u65b9\u30a4\u30f3\u30c1\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u898f\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u901a\u5e38\u3001\u5fc5\u8981\u306a\u4f53\u7a4d\u306f\u3001\u63a5\u7d9a\u7bb1\u5185\u306b\u53ce\u5bb9\u3059\u308b\u5fc5\u8981\u306e\u3042\u308b\u96fb\u7dda\u306e\u6570\u3068\u30b5\u30a4\u30ba\u3001\u304a\u3088\u3073\u63a5\u7d9a\u7bb1\u5185\u306b\u8a2d\u7f6e\u3055\u308c\u308b\u7d99\u624b\u3001\u30b9\u30a4\u30c3\u30c1\u3001\u30b3\u30f3\u30bb\u30f3\u30c8\u306a\u3069\u306e\u6a5f\u5668\u306b\u57fa\u3065\u3044\u3066\u6c7a\u5b9a\u3055\u308c\u307e\u3059\u3002.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Box_Fill_Requirements\"><\/span>\u7bb1\u8a70\u3081\u8981\u4ef6<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>\u9069\u5207\u306a\u914d\u7dda\u30ec\u30a4\u30a2\u30a6\u30c8\u3068\u96fb\u6c17\u7684\u306a\u5b89\u5168\u6027\u3092\u78ba\u4fdd\u3059\u308b\u305f\u3081\u3001NEC\u898f\u683c\u3067\u306f\u3001\u96fb\u7dda\u306e\u30b5\u30a4\u30ba\u3084\u672c\u6570\u306b\u5fdc\u3058\u3066\u5fc5\u8981\u306a\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u6700\u5c0f\u30b5\u30a4\u30ba\u3068\u5bb9\u7a4d\u304c\u660e\u78ba\u306b\u898f\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4f8b\u3048\u3070\u300118\u7acb\u65b9\u30a4\u30f3\u30c1\u306e\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306b\u306f\u6700\u59273\uff5e6\u672c\u306e\u96fb\u7dda\u3092\u53ce\u5bb9\u3067\u304d\u300120\u7acb\u65b9\u30a4\u30f3\u30c1\u306e\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306b\u306f\u6700\u59277\uff5e8\u672c\u306e\u96fb\u7dda\u3092\u53ce\u5bb9\u3067\u304d\u307e\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"NEC_370-29%E2%80%94Junction_Boxes_in_Hazardous_Locations\"><\/span>NEC 370-29\u2014\u5371\u967a\u5834\u6240\u306b\u304a\u3051\u308b\u63a5\u7d9a\u7bb1<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-47373\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Plastic-Junction-Box-2.jpg\" alt=\"\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u88fd\u63a5\u7d9a\u7bb1\uff082\u500b\uff09\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Plastic-Junction-Box-2.jpg 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Plastic-Junction-Box-2-150x84.jpg 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Plastic-Junction-Box-2-768x432.jpg 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Plastic-Junction-Box-2-18x10.jpg 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u5371\u967a\u5834\u6240\u3067\u4f7f\u7528\u3055\u308c\u308b\u63a5\u7d9a\u7bb1\u306e\u88fd\u9020\u306b\u306f\u3001\u9069\u5207\u306a\u6750\u6599\u306e\u9078\u5b9a\u304c\u4e0d\u53ef\u6b20\u3067\u3059\u3002\u3053\u306e\u7a2e\u306e\u63a5\u7d9a\u7bb1\u306f\u901a\u5e38\u3001\u53ef\u71c3\u6027\u30ac\u30b9\u3084\u7c89\u5875\u304c\u5b58\u5728\u3059\u308b\u74b0\u5883\u3067\u4f7f\u7528\u3055\u308c\u308b\u305f\u3081\u3001\u5927\u898f\u6a21\u306a\u7206\u767a\u4e8b\u6545\u3092\u9632\u3050\u305f\u3081\u306b\u3001\u7279\u5b9a\u306e\u5b89\u5168\u57fa\u6e96\u306b\u6e96\u62e0\u3057\u305f\u88fd\u9020\u304c\u6c42\u3081\u3089\u308c\u307e\u3059\u3002.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Special_Requirements_for_Hazardous_Areas\"><\/span>\u5371\u967a\u533a\u57df\u306b\u304a\u3051\u308b\u7279\u5225\u306a\u8981\u4ef6<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>\u5371\u967a\u533a\u57df\u5185\u306e\u63a5\u7d9a\u7bb1\u306f\u3001\u53ef\u71c3\u6027\u30ac\u30b9\u304c\u6f0f\u308c\u51fa\u306a\u3044\u3088\u3046\u306b\u53b3\u91cd\u306b\u5bc6\u9589\u3055\u308c\u3066\u3044\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u307e\u305f\u3001\u9632\u7206\u69cb\u9020\u3067\u3042\u308b\u3053\u3068\u3082\u5fc5\u9808\u3067\u3059\u3002\u5185\u90e8\u3067\u7206\u767a\u304c\u8d77\u304d\u305f\u5834\u5408\u3067\u3082\u3001\u63a5\u7d9a\u7bb1\u304c\u640d\u50b7\u3057\u3066\u5927\u898f\u6a21\u306a\u7206\u767a\u3084\u706b\u707d\u3092\u5f15\u304d\u8d77\u3053\u3055\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n<p>\u3055\u3089\u306b\u3001\u9759\u96fb\u6c17\u306b\u3088\u308b\u767a\u706b\u3092\u9632\u3050\u5fc5\u8981\u3082\u3042\u308a\u307e\u3059\u3002\u9759\u96fb\u6c17\u9664\u53bb\u306f\u3001\u305d\u306e\u91cd\u8981\u306a\u6a5f\u80fd\u306e\u4e00\u3064\u3067\u3059\u3002\u5404\u7a2e\u63a5\u7d9a\u7bb1\u306b\u306f\u3001\u5371\u967a\u8868\u793a\u3084\u6700\u9ad8\u4f7f\u7528\u6e29\u5ea6\u7b49\u7d1a\u306a\u3069\u3001\u660e\u78ba\u306a\u30e9\u30d9\u30eb\u8868\u793a\u304c\u5fc5\u8981\u3067\u3059\u3002.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Installation_Restrictions\"><\/span>\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u306b\u95a2\u3059\u308b\u5236\u9650\u4e8b\u9805<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>\u63a5\u7d9a\u7bb1\u306f\u3001\u5929\u4e95\u3001\u58c1\u3001\u307e\u305f\u306f\u5c4b\u6839\u88cf\u3084\u5e8a\u4e0b\u306a\u3069\u306e\u624b\u306e\u5c4a\u304b\u306a\u3044\u5834\u6240\u306b\u96a0\u3057\u3066\u8a2d\u7f6e\u3057\u3066\u306f\u306a\u3089\u306a\u3044\u3002.<\/p>\n<p>\u53ef\u71c3\u6027\u30ac\u30b9\u3084\u7c89\u5875\u304c\u767a\u751f\u3057\u3001\u706b\u707d\u3084\u7206\u767a\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u306e\u3042\u308b\u5834\u6240\u306b\u306f\u8a2d\u7f6e\u3057\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"NEC_31429%E2%80%94Junction_Box_in_Non-Hazardous_Locations\"><\/span>NEC 314.29\u2014\u975e\u5371\u967a\u5834\u6240\u306b\u304a\u3051\u308b\u63a5\u7d9a\u7bb1<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4><span class=\"ez-toc-section\" id=\"NEC_Requirements\"><\/span>NEC\u306e\u8981\u4ef6<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>\u975e\u5371\u967a\u533a\u57df\u306b\u304a\u3051\u308b\u63a5\u7d9a\u7bb1\u306b\u3064\u3044\u3066\u306f\u3001NEC\uff08\u7c73\u56fd\u96fb\u6c17\u5de5\u4e8b\u898f\u7a0b\uff09\u306f\u3001\u4fdd\u5b88\u70b9\u691c\u3092\u5bb9\u6613\u306b\u3059\u308b\u305f\u3081\u3001\u30a2\u30af\u30bb\u30b9\u3057\u3084\u3059\u3044\u5834\u6240\u306b\u8a2d\u7f6e\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3068\u660e\u78ba\u306b\u898f\u5b9a\u3057\u3066\u3044\u308b\u3002\u8a2d\u7f6e\u5834\u6240\u306e\u5468\u56f2\u306b\u306f\u969c\u5bb3\u7269\u304c\u3042\u3063\u3066\u306f\u306a\u3089\u305a\u3001\u5b89\u5168\u306a\u64cd\u4f5c\u3068\u4fdd\u5b88\u304c\u53ef\u80fd\u3067\u3042\u308b\u3002\u3055\u3089\u306b\u3001\u63a5\u7d9a\u7bb1\u306f\u9577\u671f\u4f7f\u7528\u306b\u3088\u308b\u305a\u308c\u3084\u7de9\u307f\u3092\u9632\u3050\u305f\u3081\u3001\u3057\u3063\u304b\u308a\u3068\u652f\u6301\u3055\u308c\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Cover_Requirements\"><\/span>\u30ab\u30d0\u30fc\u8981\u4ef6<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>\u30ab\u30d0\u30fc\u306f\u3057\u3063\u304b\u308a\u3068\u56fa\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u3001\u901a\u5e38\u306f\u30cd\u30b8\u3067\u7de0\u3081\u4ed8\u3051\u307e\u3059\u3002\u30ab\u30d0\u30fc\u306f\u7aef\u304b\u3089\u6700\u5927\u3067\u30821\/8\u30a4\u30f3\u30c1\uff08\u7d043mm\uff09\u4ee5\u4e0a\u306f\u307f\u51fa\u3055\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u3067\u3001\u5076\u767a\u7684\u306a\u611f\u96fb\u4e8b\u6545\u3092\u52b9\u679c\u7684\u306b\u9632\u6b62\u3067\u304d\u307e\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"NEC_250110%E2%80%94Grounding_Requirements\"><\/span>NEC 250.110\u2014\u63a5\u5730\u8981\u4ef6<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-47502\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Junction-Box-Grounding-Requirements.jpg\" alt=\"\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u63a5\u5730\u8981\u4ef6\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Junction-Box-Grounding-Requirements.jpg 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Junction-Box-Grounding-Requirements-150x84.jpg 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Junction-Box-Grounding-Requirements-768x432.jpg 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Junction-Box-Grounding-Requirements-18x10.jpg 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u7b2c250.110\u6761\u3067\u306f\u3001\u96fb\u6c17\u6a5f\u5668\u306e\u63a5\u5730\u57fa\u6e96\u3092\u898f\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u63a5\u7d9a\u7bb1\u3092\u63a5\u5730\u3059\u308b\u3053\u3068\u3067\u611f\u96fb\u3084\u706b\u707d\u3092\u9632\u6b62\u3057\u3001\u6545\u969c\u96fb\u6d41\u306e\u5b89\u5168\u306a\u5e30\u9084\u7d4c\u8def\u3092\u78ba\u4fdd\u3059\u308b\u52b9\u679c\u7684\u306a\u5bfe\u7b56\u3067\u3059\u3002\u3053\u306e\u5bfe\u7b56\u306f\u4e3b\u306b\u3001\u63a5\u5730\u5c0e\u4f53\u3092\u63a5\u7d9a\u7bb1\u306b\u63a5\u7d9a\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u884c\u308f\u308c\u307e\u3059\u3002.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Grounding_for_Metal_Junction_Boxes\"><\/span>\u91d1\u5c5e\u88fd\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u63a5\u5730<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u5185\u90e8\u306e\u91d1\u5c5e\u90e8\u54c1\u306f\u3001\u63a5\u5730\u30b7\u30b9\u30c6\u30e0\u306b\u63a5\u7d9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u63a5\u5730\u7dda\u306f\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u30b5\u30a4\u30ba\u306b\u5408\u308f\u305b\u308b\u5fc5\u8981\u304c\u3042\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u91d1\u5c5e\u88fd\u306e\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306f\u3001\u306d\u3058\u7a74\u306b\u63a5\u5730\u30cd\u30b8\u3092\u53d6\u308a\u4ed8\u3051\u3066\u63a5\u5730\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Grounding_for_Non-Metallic_Junction_Boxes\"><\/span>\u975e\u91d1\u5c5e\u88fd\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u63a5\u5730<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u306a\u3069\u306e\u975e\u91d1\u5c5e\u88fd\u306e\u63a5\u7d9a\u7bb1\u306e\u5834\u5408\u3067\u3082\u3001\u9069\u5207\u306a\u4f4d\u7f6e\u306b\u3001\u898f\u683c\u306b\u9069\u5408\u3057\u305f\u63a5\u5730\u30af\u30ea\u30c3\u30d7\u307e\u305f\u306f\u63a5\u5730\u5c0e\u4f53\u3092\u4f7f\u7528\u3057\u3066\u8a2d\u7f6e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001NEC\uff08\u7c73\u56fd\u96fb\u6c17\u5de5\u4e8b\u898f\u7a0b\uff09\u306b\u6e96\u62e0\u3057\u305f\u63a5\u5730\u65b9\u6cd5\u306b\u5f93\u3063\u3066\u63a5\u5730\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"NEC_11026-Clearance_Requirements\"><\/span>NEC 110.26 - \u30af\u30ea\u30a2\u30e9\u30f3\u30b9\u8981\u4ef6<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u7b2c110.26\u6761\u306f\u4e3b\u306b\u3001\u63a5\u7d9a\u7bb1\u3068\u305d\u306e\u4ed6\u306e\u96fb\u6c17\u6a5f\u5668\u3068\u306e\u9593\u306e\u5b89\u5168\u8ddd\u96e2\u3092\u898f\u5b9a\u3057\u3001\u96fb\u6c17\u6280\u5e2b\u306e\u4f5c\u696d\u306e\u305f\u3081\u306b\u5408\u7406\u7684\u304b\u3064\u5b89\u5168\u306a\u7a7a\u9593\u3092\u78ba\u4fdd\u3059\u308b\u3082\u306e\u3067\u3059\u3002.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Clearance_Operation_Requirements\"><\/span>\u30af\u30ea\u30a2\u30e9\u30f3\u30b9\u4f5c\u696d\u8981\u4ef6<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>\u96fb\u6c17\u30dc\u30c3\u30af\u30b9\u524d\u9762\u306e\u6700\u5c0f\u4f5c\u696d\u30b9\u30da\u30fc\u30b9\u306f\u5965\u884c\u304d36\u30a4\u30f3\u30c1\u3067\u3059\u3002\u70b9\u691c\u3084\u4f5c\u696d\u5de5\u5177\u306e\u4f7f\u7528\u306b\u5fc5\u8981\u306a\u5965\u884c\u304d\u30b9\u30da\u30fc\u30b9\u306f30\u30a4\u30f3\u30c1\u3067\u3059\u3002\u5b89\u5168\u304a\u3088\u3073\u4fdd\u5b88\u4e0a\u306e\u7406\u7531\u304b\u3089\u3001NEC\uff08\u7c73\u56fd\u96fb\u6c17\u5de5\u4e8b\u898f\u7a0b\uff09\u3067\u306f\u3001\u8a2d\u7f6e\u6a5f\u5668\u306e\u96fb\u5727\u306b\u57fa\u3065\u3044\u3066\u6c7a\u5b9a\u3055\u308c\u308b\u6700\u4f4e6\u30d5\u30a3\u30fc\u30c8\u306e\u30d8\u30c3\u30c9\u30eb\u30fc\u30e0\u3092\u78ba\u4fdd\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3068\u898f\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Accessibility_Rules\"><\/span>\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u30eb\u30fc\u30eb<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>\u90e8\u54c1\u3084\u56de\u8def\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092\u5bb9\u6613\u306b\u3059\u308b\u305f\u3081\u3001\u30c7\u30d0\u30a4\u30b9\u306e\u30c9\u30a2\u306f\u5c11\u306a\u304f\u3068\u308290\u5ea6\u307e\u3067\u958b\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4f5c\u696d\u30b9\u30da\u30fc\u30b9\u306f\u6e05\u6f54\u306b\u4fdd\u3061\u3001\u901a\u8def\u3092\u585e\u3050\u969c\u5bb3\u7269\u304c\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Avoid_Common_NEC_Violations\"><\/span>\u3088\u304f\u3042\u308bNEC\u9055\u53cd\u3092\u56de\u907f\u3059\u308b\u65b9\u6cd5<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-47503\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Junction-Box.jpg\" alt=\"\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Junction-Box.jpg 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Junction-Box-150x84.jpg 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Junction-Box-768x432.jpg 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Junction-Box-18x10.jpg 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Junction_Box_Overload\"><\/span>\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u904e\u8ca0\u8377<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u5185\u90e8\u306b\u914d\u7dda\u3001\u30b3\u30cd\u30af\u30bf\u3001\u6a5f\u5668\u304c\u591a\u3059\u304e\u3066\u3001\u30dc\u30c3\u30af\u30b9\u306e\u8868\u793a\u5bb9\u91cf\u3092\u8d85\u3048\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u6a5f\u5668\u306e\u71b1\u84c4\u7a4d\u3092\u5f15\u304d\u8d77\u3053\u3057\u3001\u7d76\u7e01\u4f53\u306e\u52a3\u5316\u3084\u6eb6\u878d\u3001\u3055\u3089\u306b\u306f\u77ed\u7d61\u3084\u706b\u707d\u306e\u539f\u56e0\u3068\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u914d\u7dda\u306e\u672c\u6570\u306b\u57fa\u3065\u3044\u3066\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u5fc5\u8981\u5bb9\u91cf\u3092\u8a08\u7b97\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u5bb9\u91cf\u304c\u4e0d\u660e\u306a\u5834\u5408\u306f\u3001\u5bb9\u91cf\u306e\u5927\u304d\u3044\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Improper_Equipment_Wiring\"><\/span>\u4e0d\u9069\u5207\u306a\u6a5f\u5668\u914d\u7dda<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u91d1\u5c5e\u88fd\u306e\u7b50\u4f53\u3084\u30c1\u30e5\u30fc\u30d6\u6e9d\u306e\u6a5f\u5668\u63a5\u5730\u7dda\u304c\u63a5\u7d9a\u3055\u308c\u3066\u3044\u306a\u3044\u304b\u3001\u9069\u5207\u306a\u7aef\u5b50\u3092\u4f7f\u7528\u305b\u305a\u306b\u63a5\u5730\u30cd\u30b8\u306b\u5dfb\u304d\u4ed8\u3051\u3089\u308c\u3066\u3044\u308b\u3060\u3051\u306e\u5834\u5408\u3001\u63a5\u5730\u4e0d\u826f\u304c\u767a\u751f\u3059\u308b\u3068\u6df1\u523b\u306a\u611f\u96fb\u4e8b\u6545\u306b\u3064\u306a\u304c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u9069\u5207\u306a\u7aef\u5b50\u53f0\u3001\u30af\u30ea\u30c3\u30d7\u3001\u307e\u305f\u306f\u30cd\u30b8\u3092\u4f7f\u7528\u3057\u3066\u3001\u78ba\u5b9f\u306a\u91d1\u5c5e\u63a5\u89e6\u3092\u78ba\u4fdd\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Using_the_Incorrect_Type_of_Junction_Box\"><\/span>\u4e0d\u9069\u5207\u306a\u30bf\u30a4\u30d7\u306e\u63a5\u7d9a\u7bb1\u306e\u4f7f\u7528<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u4f8b\u3048\u3070\u3001\u6e7f\u5ea6\u306e\u9ad8\u3044\u74b0\u5883\u3067\u306f\u3001\u4e7e\u71e5\u3057\u305f\u5834\u6240\u3067\u4e00\u822c\u7684\u306b\u4f7f\u7528\u3055\u308c\u308b\u63a5\u7d9a\u7bb1\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u4e0d\u9069\u5207\u306a\u63a5\u7d9a\u7bb1\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u5185\u90e8\u306b\u57c3\u3084\u6e7f\u6c17\u304c\u4fb5\u5165\u3057\u307e\u3059\u3002\u6e7f\u6c17\u306f\u8150\u98df\u3001\u77ed\u7d61\u3001\u611f\u96fb\u306e\u5371\u967a\u6027\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u30a2\u30af\u30bb\u30b5\u30ea\u3092\u63a5\u7d9a\u3059\u308b\u969b\u306f\u3001\u5fc5\u305aNEC\u898f\u683c\u306b\u6e96\u62e0\u3057\u305f\u5c02\u7528\u306e\u63a5\u7d9a\u7bb1\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Excessive_Filling_of_Conduit_or_Cable_Trays\"><\/span>\u96fb\u7dda\u7ba1\u307e\u305f\u306f\u30b1\u30fc\u30d6\u30eb\u30c8\u30ec\u30a4\u3078\u306e\u904e\u5270\u306a\u5145\u586b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u96fb\u7dda\u7ba1\u306b\u633f\u5165\u3055\u308c\u308b\u96fb\u7dda\u306e\u65ad\u9762\u7a4d\u304c\u8a31\u5bb9\u6700\u5927\u5145\u586b\u7387\u3092\u8d85\u3048\u308b\u3068\u3001\u653e\u71b1\u4e0d\u826f\u3001\u96fb\u7dda\u306e\u904e\u71b1\u3001\u7d76\u7e01\u4f53\u306e\u640d\u50b7\u306b\u3064\u306a\u304c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u96fb\u7dda\u7ba1\u306e\u9069\u5207\u306a\u5145\u586b\u7387\u3092\u8a08\u7b97\u3059\u308b\u304b\u3001\u3088\u308a\u5927\u304d\u306a\u96fb\u7dda\u7ba1\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u3067\u3001\u653e\u71b1\u6027\u3092\u5411\u4e0a\u3055\u305b\u3001\u5c06\u6765\u306e\u914d\u7dda\u62e1\u5f35\u306e\u305f\u3081\u306e\u5341\u5206\u306a\u30b9\u30da\u30fc\u30b9\u3092\u78ba\u4fdd\u3067\u304d\u307e\u3059\u3002.<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-47501\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Junction-Box-2.jpg\" alt=\"\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\uff082\uff09\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Junction-Box-2.jpg 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Junction-Box-2-150x84.jpg 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Junction-Box-2-768x432.jpg 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Junction-Box-2-18x10.jpg 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>\u3088\u304f\u3042\u308b\u8cea\u554f<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"What_Are_the_Differences_for_Enclosures_Between_NEMA_and_NEC\"><\/span>NEMA\u3068NEC\u306e\u7b50\u4f53\u306b\u95a2\u3059\u308b\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><a href=\"https:\/\/www.kdmsteel.com\/ja\/\u30cd\u30de\u30a8\u30f3\u30af\u30ed\u30fc\u30b8\u30e3\/\">\u30cd\u30de<\/a>\u00a0\u306f\u696d\u754c\u6a19\u6e96\u5316\u56e3\u4f53\u3067\u3059\u3002\u4e3b\u306b\u7b50\u4f53\u306e\u88fd\u54c1\u6027\u80fd\u57fa\u6e96\u3092\u5b9a\u3081\u3066\u304a\u308a\u3001\u9632\u5875\u6027\u3001\u9632\u6c34\u6027\u3001\u8010\u8150\u98df\u6027\u306a\u3069\u3001\u96fb\u6c17\u7b50\u4f53\u306e\u7269\u7406\u7684\u7279\u6027\u3092\u5206\u985e\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002NEC\u306f\u898f\u5236\u4e0a\u306e\u5b89\u5168\u8a2d\u7f6e\u4ed5\u69d8\u3067\u3042\u308a\u3001\u7279\u5b9a\u306e\u8a2d\u7f6e\u306b\u304a\u3044\u3066\u3001\u5bfe\u5fdc\u3059\u308bNEMA\u30b0\u30ec\u30fc\u30c9\u306b\u6e96\u62e0\u3057\u305f\u7b50\u4f53\u306e\u4f7f\u7528\u3092\u7fa9\u52d9\u4ed8\u3051\u3066\u3044\u307e\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_Choose_a_Junction_Box_of_the_Appropriate_Volume\"><\/span>\u9069\u5207\u306a\u5bb9\u91cf\u306e\u63a5\u7d9a\u7bb1\u306e\u9078\u3073\u65b9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>NEC 314.16\u306b\u3088\u308b\u3068\u3001\u30dc\u30c3\u30af\u30b9\u5185\u306e\u3059\u3079\u3066\u306e\u90e8\u54c1\u3092\u6570\u3048\u3001NEC\u898f\u683c\u306b\u5f93\u3063\u3066\u305d\u308c\u3089\u304c\u5360\u3081\u308b\u96fb\u7dda\u306e\u6570\u3092\u8a08\u7b97\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u6b21\u306b\u3001\u6700\u5927\u96fb\u7dda\u4ed5\u69d8\u306b\u57fa\u3065\u3044\u3066\u3001\u96fb\u7dda\u5358\u4f4d\u91cf\u3042\u305f\u308a\u306e\u4f53\u7a4d\u3092\u6c7a\u5b9a\u3057\u307e\u3059\u3002\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u4f53\u7a4d\u306f\u3001\u5fc5\u8981\u306a\u4f53\u7a4d\u3088\u308a\u3082\u5927\u304d\u3044\u65b9\u304c\u671b\u307e\u3057\u3044\u3067\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_the_Covering_Junction_Box_Safe_and_Complies_with_NEC_Regulations\"><\/span>\u30ab\u30d0\u30fc\u4ed8\u304d\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306f\u5b89\u5168\u3067\u3001NEC\u898f\u683c\u306b\u6e96\u62e0\u3057\u3066\u3044\u307e\u3059\u304b\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u306f\u3044\u3001\u30ab\u30d0\u30fc\u4ed8\u304d\u306e\u63a5\u7d9a\u7bb1\u306f\u5b89\u5168\u3067\u3042\u308b\u3060\u3051\u3067\u306a\u304f\u3001NEC\u898f\u683c\u3067\u7fa9\u52d9\u4ed8\u3051\u3089\u308c\u3066\u3044\u308b\u8981\u4ef6\u3067\u3082\u3042\u308a\u307e\u3059\u3002\u3059\u3079\u3066\u306e\u63a5\u7d9a\u7bb1\u306b\u306f\u5b8c\u5168\u306a\u30ab\u30d0\u30fc\u304c\u53d6\u308a\u4ed8\u3051\u3089\u308c\u3066\u3044\u306a\u3051\u308c\u3070\u306a\u3089\u305a\u3001\u3053\u308c\u306b\u3088\u308a\u611f\u96fb\u3092\u9632\u304e\u3001\u57c3\u3084\u6e7f\u6c17\u306e\u4fb5\u5165\u3092\u9632\u304e\u3001\u96fb\u6c17\u7b50\u4f53\u30b7\u30b9\u30c6\u30e0\u306e\u5b8c\u5168\u6027\u3092\u78ba\u4fdd\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/p>\n<p>\u9078\u629e\u3059\u308b\u30ab\u30d0\u30fc\u30d7\u30ec\u30fc\u30c8\u306f\u3001\u63a5\u7d9a\u7bb1\u306e\u7a2e\u985e\u306b\u9069\u5408\u3057\u3001\u8a2d\u7f6e\u74b0\u5883\u306b\u9069\u3057\u305f\u3082\u306e\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30ab\u30d0\u30fc\u306f\u3001\u63a5\u7d9a\u7bb1\u306e\u958b\u53e3\u90e8\u3092\u5b89\u5168\u306b\u8986\u3046\u3088\u3046\u306b\u3057\u3063\u304b\u308a\u3068\u53d6\u308a\u4ed8\u3051\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_Consequences_can_be_Caused_by_Incorrect_Grounding_of_the_Junction_Box\"><\/span>\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u306e\u63a5\u5730\u304c\u4e0d\u9069\u5207\u3060\u3068\u3001\u3069\u306e\u3088\u3046\u306a\u5f71\u97ff\u304c\u751f\u3058\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u304b\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u96fb\u7dda\u306e\u904e\u71b1\u306b\u3088\u308a\u3001\u611f\u96fb\u6b7b\u3084\u706b\u707d\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u6545\u969c\u96fb\u5727\u304c\u96fb\u6e90\u306b\u623b\u3089\u306a\u3044\u3068\u3001\u6a5f\u5668\u306e\u640d\u50b7\u306b\u3064\u306a\u304c\u308b\u6050\u308c\u304c\u3042\u308a\u307e\u3059\u3002\u6700\u3082\u91cd\u8981\u306a\u306e\u306f\u3001\u627f\u8a8d\u3055\u308c\u3066\u3044\u306a\u3044\u8a2d\u5099\u306f\u96fb\u6c17\u691c\u67fb\u306b\u5408\u683c\u3067\u304d\u305a\u3001\u7f70\u91d1\u3084\u6cd5\u7684\u8cac\u4efb\u3092\u554f\u308f\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3053\u3068\u3067\u3059\u3002.<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-47379\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Weatherproof-Junction-Box.jpg\" alt=\"\u8010\u5019\u6027\u63a5\u7d9a\u30dc\u30c3\u30af\u30b9\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Weatherproof-Junction-Box.jpg 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Weatherproof-Junction-Box-150x84.jpg 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Weatherproof-Junction-Box-768x432.jpg 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2025\/12\/Weatherproof-Junction-Box-18x10.jpg 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Final_Thought\"><\/span>\u6700\u5f8c\u306b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u5b89\u5168\u306a\u96fb\u6c17\u8a2d\u5099\u306b\u306f\u3001NEC\u898f\u683c\u306b\u5f93\u3046\u3060\u3051\u3067\u306a\u304f\u3001\u69d8\u3005\u306a\u72b6\u6cc1\u306b\u5bfe\u5fdc\u3057\u305f\u4ed5\u69d8\u3092\u6e80\u305f\u3059\u63a5\u7d9a\u7bb1\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3082\u5fc5\u8981\u3067\u3059\u3002. <a href=\"https:\/\/www.kdmsteel.com\/ja\/\">\u30b1\u30e0<\/a>\u00a0\u5f53\u793e\u306f\u3001\u7279\u6ce8\u96fb\u6c17\u7b50\u4f53\u306e\u5c02\u9580\u30e1\u30fc\u30ab\u30fc\u3067\u3059\u3002NEMA 1\u304b\u3089NEMA 13\u307e\u3067\u306e\u96fb\u6c17\u7b50\u4f53\u3092\u7279\u6ce8\u3067\u88fd\u9020\u3057\u3001\u304a\u5ba2\u69d8\u306e\u3042\u3089\u3086\u308b\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u30cb\u30fc\u30ba\u306b\u304a\u5fdc\u3048\u3057\u307e\u3059\u3002\u8fc5\u901f\u306a\u5bfe\u5fdc\u3068\u5305\u62ec\u7684\u306a\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u30b5\u30fc\u30d3\u30b9\u306f\u3001\u7279\u6ce8\u88fd\u9020\u306b\u304a\u3051\u308b\u5f53\u793e\u306e\u5927\u304d\u306a\u5f37\u307f\u3067\u3059\u3002\u304a\u5ba2\u69d8\u4e00\u4eba\u3072\u3068\u308a\u306b\u6700\u9069\u306a\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u3092\u3054\u63d0\u4f9b\u3044\u305f\u3057\u307e\u3059\u306e\u3067\u3001\u304a\u6c17\u8efd\u306b\u304a\u554f\u3044\u5408\u308f\u305b\u304f\u3060\u3055\u3044\u3002.<\/p>","protected":false},"excerpt":{"rendered":"<p>The NEC, as the minimum safety requirement for electrical installations in the United States, provides comprehensive guidance for all industries. What specific electrical standards does the NEC specify? If you need to install electrical wiring systems in buildings using junction boxes, this article will discuss the NEC requirements you need to follow. What is the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":47501,"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":"","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-47499","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 v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Junction Box NEC Code Standards - 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\/\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9-nec-\u30b3\u30fc\u30c9\u898f\u683c\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Junction Box NEC Code Standards - KDM Steel\" \/>\n<meta property=\"og:description\" content=\"The NEC, as the minimum safety requirement for electrical installations in the United States, provides comprehensive guidance for all industries. 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