{"id":4127,"date":"2023-01-05T14:05:29","date_gmt":"2023-01-05T13:05:29","guid":{"rendered":"https:\/\/www.gt-engineering.it\/normative-tecniche\/%tipologia_normativa%\/nfpa-79-2021-chapter-6-protection-from-electrical-hazards\/"},"modified":"2024-01-05T13:00:53","modified_gmt":"2024-01-05T12:00:53","slug":"nfpa-79-2021-chapter-6-protection-from-electrical-hazards","status":"publish","type":"normativa_tecnica","link":"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/industrial-machinery\/nfpa-79-2021-chapter-6-protection-from-electrical-hazards\/","title":{"rendered":"NFPA 79 &#8211; 2024, Chapter 6: Protection from Electrical Hazards"},"content":{"rendered":"\n\n    \n        <section\n            data-name=\"Contenuto testuale con immagine\"\n            class=\"bow-gte-testo-media u-spacer-base\"\n            id=\"\"\n        >\n            \n<div class=\"o-text-media px-side-spacer sm:px-side-spacer-sm lg:px-side-spacer-tablet 2xl:px-side-spacer-desktop flex flex-wrap items-start md:block\">\n\n    \n                    <div class=\"mb-6 relative w-full md:mb-4 lg:mb-8 xl:mb-9\">\n                \n        <div                class=\"m-headings\"\n            >\n    \n    \n<h4 class=\"a-heading text-left text-primary font-heading text-2xl lg:text-3xl xl:text-4xl font-normal mt-2 first:mt-0\">\n                    6.2.3.1\u00a0 Enclosure Access    <\/h4>\n        <\/div>\n                <\/div>\n        \n                    <div\n                class=\"h-auto mb-6 md:mb-4 lg:mb-8 xl:mb-9 float-left mr-6 md:mr-4 lg:mr-8 xl:mr-9  overflow-hidden shadow-content-image w-full md:w-1\/4\"\n            >\n                \r\n\r\n    \r\n        \r\n            \r\n                \r\n                    <picture\r\n                        class=\"\"\r\n                                            >\r\n                                                                                                        <source\r\n                                media=\"(max-width: 150px)\"\r\n                                width=\"150\"\r\n                                height=\"150\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/NFPA-79-2021-Chapter-6-150x150.jpg\"\r\n                                type=\"image\/jpeg\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 225px)\"\r\n                                width=\"225\"\r\n                                height=\"300\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/NFPA-79-2021-Chapter-6-225x300.jpg\"\r\n                                type=\"image\/jpeg\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 768px)\"\r\n                                width=\"768\"\r\n                                height=\"1024\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/NFPA-79-2021-Chapter-6-768x1024.jpg\"\r\n                                type=\"image\/jpeg\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 768px)\"\r\n                                width=\"768\"\r\n                                height=\"1024\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/NFPA-79-2021-Chapter-6-768x1024.jpg\"\r\n                                type=\"image\/jpeg\"\r\n                            \/>\r\n                                                                            <img\r\n                            class=\"a-image transparent border-image h-auto  w-full\"\r\n                                                        srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/NFPA-79-2021-Chapter-6-scaled.jpg\"\r\n                                                        title=\"NFPA 79 &#8211; 2021, Chapter 6\"\r\n                                                        type=\"image\/jpeg\"\r\n                        \/>\r\n                    <\/picture>\r\n\r\n                \r\n\r\n                    \r\n    \r\n            <\/div>\n        \n                    <div class=\"relative w-full\">\n                \n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n    <p style=\"margin: 0cm 0cm 8pt; text-align: justify;\"><span style=\"margin: 0cm 0cm 8pt;\">This is the chapter that was most changed in the 2021 Edition, compared with the 2018 edition.\u00a0<\/span><\/p>\n<p><span style=\"margin: 0cm 0cm 8pt;\">Here the language from the 2018 edition\u00a0<\/span><\/p>\n<blockquote><p><em>[NFPA 79: 2018] <strong>6.2.3.1 Enclosure Interlocking. <\/strong><\/em><\/p>\n<p><em>When required by 5.3.1.4, each disconnecting means mounted within or adjacent to a control enclosure that contains live parts operating at 50 volts ac (rms value) or 60 volts dc or more shall be mechanically or electrically interlocked, or both, with the control enclosure doors so that none of the doors open unless the power is disconnected. Interlocking shall be reactivated automatically when all the doors are closed.<\/em><\/p><\/blockquote>\n<p><span style=\"margin: 0cm 0cm 8pt;\">Here the new language:<br \/>\n<\/span><\/p>\n<blockquote><p><strong><em>[NFPA 79: 2021] 6.2.3.1\u00a0 Enclosure Access.<\/em><\/strong><br \/>\n<em>Opening an enclosure (e.g.\u00a0 doors, lid, cover) that contains\u00a0 live parts operating at or above 50 volts rms\u00a0ac or 60 volts dc shall be permitted only under one or more of the following conditions:<\/em><\/p>\n<p><em>The use of a key or tool is necessary for access to live parts operating at or above 50 volts rms ac or 60 volts dc. AII live\u00a0 parts mounted on the inside of doors or covers that are operating at or above 50 volts rms ac or 60 volts dc shall be protected from unintentional direct contact by the inherent design of components or the application of barriers or obstacles such that a 50 mm (2 in.) sphere cannot contact any live parts. A safety sign shall be provided in accordance with\u00a0 16.2.4.<\/em><br \/>\n<em>The disconnecting means supplying the enclosure is interlocked with the enclosure door(s) in accordance with 6.2.3.2.<\/em><br \/>\n<em>Opening without the use of a key or a tool and without disconnection of live parts shall be permitted only when all live parts inside that are operating at or above\u00a0 50 volts rms ac or 60 volts dc are separately enclosed or guarded such that there cannot be any contact with live parts. A safety sign shall be provided in accordance with 16.2.4.<\/em><\/p><\/blockquote>\n<p><span style=\"margin: 0cm 0cm 8pt;\">\u00a0<\/span><\/p>\n<p style=\"margin: 0cm 0cm 8pt; text-align: justify;\"><span style=\"margin: 0cm 0cm 8pt;\">In essence, the inside of a control panel does not required any type of protection from direct contacts (IP 0 in IEC terminology). If IP 1 is present for components mounted on the inside of the doors, than <strong>a key is enough to guarantee protection<\/strong>; otherwise, all the doors need to be interlocked. <\/span><\/p>\n<p><span style=\"margin: 0cm 0cm 8pt;\">That means, from 2021, that\u00a0<strong>no door interlocks will be required anymore<\/strong> for most of the industrial control panels with destination USA or Canada.<\/span><\/p>\n<\/div>            <\/div>\n        \n        \n                <div class=\"clear-both\"><\/div>\n        \n\n    <\/div>\n        <\/section>\n\n    \n","protected":false},"excerpt":{"rendered":"<p>&#8230;<\/p>\n","protected":false},"author":1,"featured_media":4128,"parent":4100,"menu_order":1,"template":"","meta":{"_acf_changed":false,"footnotes":""},"normative-tecniche":[59],"class_list":["post-4127","normativa_tecnica","type-normativa_tecnica","status-publish","has-post-thumbnail","hentry","tipologia_normativa-ul-and-nfpa-standards"],"acf":{"sottotitolo":"","allegati":null},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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