{"id":50047,"date":"2023-02-22T11:40:56","date_gmt":"2023-02-22T10:40:56","guid":{"rendered":"https:\/\/www.gt-engineering.it\/?post_type=approfondimento&#038;p=50047"},"modified":"2025-08-25T08:43:16","modified_gmt":"2025-08-25T07:43:16","slug":"nfpa-70-2017-2020-edition","status":"publish","type":"approfondimento","link":"https:\/\/www.gt-engineering.it\/en\/insights\/ul-and-csa-conformity\/nfpa-70-2017-2020-edition\/","title":{"rendered":"NFPA 70 &#8211; 2017-2020 Edition"},"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        \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><span dir=\"auto\">The new edition of NFPA 70, or NEC 2017, was published in August 2016 and is valid for the 2017-2020 three-year period.<\/span><br \/>\n<span dir=\"auto\">This important document (over 800 pages) details the design and construction requirements for electrical systems in the United States.<\/span><br \/>\n<span dir=\"auto\">Several new articles are included in the 2017 edition of the NEC, including the following:<\/span><\/p>\n<ul>\n<li><span dir=\"auto\">Article 425 \u2013 Fixed Resistance and Electrode Industrial Process Heating Equipment<\/span><\/li>\n<li><span dir=\"auto\">Article 691 \u2013 Large-Scale Photovoltaic (PV) Electric Supply Stations<\/span><\/li>\n<li><span dir=\"auto\">Article 706 \u2013 Energy Storage Systems (ESS)<\/span><\/li>\n<li><span dir=\"auto\">Article 712 \u2013 Direct Current Microgrids<\/span><\/li>\n<\/ul>\n<p><span dir=\"auto\">The content of these articles is described below.<\/span><\/p>\n<\/div>            <\/div>\n        \n        \n                <div class=\"clear-both\"><\/div>\n        \n\n    <\/div>\n        <\/section>\n\n    \n\n\n\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<h2 class=\"a-heading text-primary font-heading text-2xl lg:text-3xl xl:text-4xl font-normal mt-2 first:mt-0\">\n                    Article 425 : Fixed Resistance and Electrode Industrial Process Heating Equipment    <\/h2>\n        <\/div>\n                <\/div>\n        \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    <section id=\"\" class=\"bow-gte-testo-media u-spacer-base\" data-name=\"Contenuto testuale con immagine\">\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<div class=\"relative w-full\">\n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n<p><span dir=\"auto\">Article\u00a0<\/span><strong><span dir=\"auto\">425<\/span><\/strong><span dir=\"auto\">\u00a0provides requirements for equipment for industrial heating processes involving the use of electric resistors and electrodes. Such equipment must be listed, and the\u00a0<\/span><a href=\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/ul-508a-definitions\/\"><span dir=\"auto\">branch circuit<\/span><\/a><span dir=\"auto\">\u00a0\u00a0into which it is installed must be appropriately sized. It also specifies the installation procedures for such equipment, such as location, operating space, and any protective measures to be adopted.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"clear-both\"><\/div>\n<\/div>\n<\/section>\n<section id=\"\" class=\"bow-gte-testo-media u-spacer-base\" data-name=\"Contenuto testuale con immagine\">\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<div class=\"mb-6 relative w-full md:mb-4 lg:mb-8 xl:mb-9\">\n<div class=\"m-headings\"><\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>            <\/div>\n        \n        \n                <div class=\"clear-both\"><\/div>\n        \n\n    <\/div>\n        <\/section>\n\n    \n\n\n\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<h2 class=\"a-heading text-primary font-heading text-2xl lg:text-3xl xl:text-4xl font-normal mt-2 first:mt-0\">\n                    Article 691: Large-Scale Photovoltaic (PV) Electric Supply Stations    <\/h2>\n        <\/div>\n                <\/div>\n        \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    <section id=\"\" class=\"bow-gte-testo-media u-spacer-base\" data-name=\"Contenuto testuale con immagine\">\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<div class=\"relative w-full\">\n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n<p><span dir=\"auto\">Article\u00a0<\/span><strong><span dir=\"auto\">691<\/span><\/strong><span dir=\"auto\">\u00a0concerns the installation of photovoltaic systems with a generation capacity exceeding 5000 kW, defining the requirements for the design, construction and commissioning of such systems.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"clear-both\"><\/div>\n<\/div>\n<\/section>\n<section id=\"\" class=\"bow-gte-testo-media u-spacer-base\" data-name=\"Contenuto testuale con immagine\">\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<div class=\"mb-6 relative w-full md:mb-4 lg:mb-8 xl:mb-9\">\n<div class=\"m-headings\"><\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>            <\/div>\n        \n        \n                <div class=\"clear-both\"><\/div>\n        \n\n    <\/div>\n        <\/section>\n\n    \n\n\n\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<h2 class=\"a-heading text-primary font-heading text-2xl lg:text-3xl xl:text-4xl font-normal mt-2 first:mt-0\">\n                    Article 706: Energy Storage Systems (ESS)    <\/h2>\n        <\/div>\n                <\/div>\n        \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    <section id=\"\" class=\"bow-gte-testo-media u-spacer-base\" data-name=\"Contenuto testuale con immagine\">\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<div 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\/2\"><picture class=\"\"><img class=\"a-image transparent border-image h-auto w-full\" title=\"energy storage\" srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/energy-storage.png.webp\" \/><\/picture><\/div>\n<div class=\"clear-both\"><\/div>\n<\/div>\n<\/section>\n<section id=\"\" class=\"bow-gte-testo-media u-spacer-base\" data-name=\"Contenuto testuale con immagine\">\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<div class=\"relative w-full\">\n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n<p><span dir=\"auto\">Of particular note is Article\u00a0<\/span><strong><span dir=\"auto\">706<\/span><\/strong><span dir=\"auto\">\u00a0\u00a0, which concerns Energy Storage Systems (ESS). It covers all permanently installed systems, including devices with electrochemical (e.g., batteries), electrolytic (e.g., capacitor banks), and devices that store kinetic energy (e.g., compressed air).<\/span><br \/>\n<span dir=\"auto\">Part\u00a0<\/span><strong><span dir=\"auto\">1<\/span><\/strong><span dir=\"auto\">\u00a0of the Article provides general requirements, such as the scope and various definitions. In particular, it establishes that all equipment for such storage systems must be &#8220;listed.&#8221; Details are provided on the switching devices (switches, disconnectors, etc.) to be used, particularly which system conductors must be capable of being equipped with a switching device.<\/span><br \/>\n<span dir=\"auto\">Part\u00a0<\/span><strong><span dir=\"auto\">2<\/span><\/strong><span dir=\"auto\">\u00a0specifically addresses the circuits of energy storage systems, particularly their sizing (conductor capacity, overcurrent protection, and sizing of conductors to the loads powered by these systems) and the maximum current that can flow.<\/span><br \/>\n<span dir=\"auto\">Parts\u00a0<\/span><strong><span dir=\"auto\">3, 4<\/span><\/strong><span dir=\"auto\">\u00a0and\u00a0<\/span><strong><span dir=\"auto\">5<\/span><\/strong><span dir=\"auto\">\u00a0are specific for electrochemical (which can cause problems due to the corrosive acid contained within them), electrolytic and kinetic storage systems respectively.<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>            <\/div>\n        \n        \n                <div class=\"clear-both\"><\/div>\n        \n\n    <\/div>\n        <\/section>\n\n    \n\n\n\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<h2 class=\"a-heading text-primary font-heading text-2xl lg:text-3xl xl:text-4xl font-normal mt-2 first:mt-0\">\n                    Article 712: Direct Current Microgrids    <\/h2>\n        <\/div>\n                <\/div>\n        \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    <section id=\"\" class=\"bow-gte-testo-media u-spacer-base\" data-name=\"Contenuto testuale con immagine\">\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<div 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\/2\"><picture class=\"\"><img class=\"a-image transparent border-image h-auto w-full\" title=\"DC-Systems\" srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/DC-Systems.png.webp\" \/><\/picture><\/div>\n<div class=\"clear-both\"><\/div>\n<\/div>\n<\/section>\n<section id=\"\" class=\"bow-gte-testo-media u-spacer-base\" data-name=\"Contenuto testuale con immagine\">\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<div class=\"relative w-full\">\n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n<p><span dir=\"auto\">Article\u00a0<\/span><strong><span dir=\"auto\">712<\/span><\/strong><span dir=\"auto\">\u00a0, composed of 9 parts, deals with direct current (DC) distribution systems, including the DC power source, DC-to-DC converters, DC loads, and AC loads powered by DC-to-AC inverters.<\/span><br \/>\n<span dir=\"auto\">Part\u00a0<\/span><strong><span dir=\"auto\">1<\/span><\/strong><span dir=\"auto\">\u00a0, as always, contains general requirements and definitions. It also specifies that any devices and equipment used must be listed and approved for DC use.<\/span><br \/>\n<span dir=\"auto\">Part\u00a0<\/span><strong><span dir=\"auto\">2<\/span><\/strong><span dir=\"auto\">\u00a0\u00a0contains circuit requirements such as \u00a0\u00a0<\/span><a href=\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/ul-508a-definitions\/\"><span dir=\"auto\">feeder<\/span><\/a><span dir=\"auto\">\u00a0and branch circuit conductor sizing and system voltage ratings.<\/span><br \/>\n<span dir=\"auto\">Part\u00a0<\/span><strong><span dir=\"auto\">3\u00a0<\/span><\/strong><span dir=\"auto\">\u00a0deals with circuit breakers and their proper placement on the system conductors.<\/span><br \/>\n<span dir=\"auto\">Part\u00a0<\/span><strong><span dir=\"auto\">4\u00a0<\/span><\/strong><span dir=\"auto\">\u00a0details wiring methods and identification of live conductors, system earthing, and ground fault and arc flash protection for the entire DC system.<\/span><br \/>\n<span dir=\"auto\">Part\u00a0<\/span><strong><span dir=\"auto\">5\u00a0<\/span><\/strong><span dir=\"auto\">\u00a0concerns the plates to be affixed to the DC system.<\/span><br \/>\n<span dir=\"auto\">Part\u00a0\u00a0<\/span><strong><span dir=\"auto\">6<\/span><\/strong><span dir=\"auto\">\u00a0discusses protective devices and specifies the sizing of overcurrent protectors, interrupting capacities and Short Circuit Current Rating (SCCR).<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\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>The new edition of NFPA 70, or NEC 2017, was published in August 2016, valid for the three-year period 2017-2020. This important document (more than&#8230;<\/p>\n","protected":false},"author":2,"featured_media":50042,"parent":0,"menu_order":119,"template":"","meta":{"_acf_changed":false,"footnotes":""},"tipologia_approfondimento":[50],"class_list":["post-50047","approfondimento","type-approfondimento","status-publish","has-post-thumbnail","hentry","tipologia_approfondimento-ul-and-csa-conformity"],"acf":{"sottotitolo":"US Panel Design Regulations","allegati":null},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>NFPA 70 - 2017-2020 Edition - Gt-Engineering<\/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.gt-engineering.it\/en\/insights\/ul-and-csa-conformity\/nfpa-70-2017-2020-edition\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NFPA 70 - 2017-2020 Edition - Gt-Engineering\" \/>\n<meta property=\"og:description\" content=\"The new edition of NFPA 70, or NEC 2017, was published in August 2016, valid for the three-year period 2017-2020. 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