{"id":4163,"date":"2023-01-05T14:16:33","date_gmt":"2023-01-05T13:16:33","guid":{"rendered":"https:\/\/www.gt-engineering.it\/normative-tecniche\/%tipologia_normativa%\/correnti-branch-circuit\/"},"modified":"2025-08-18T15:40:40","modified_gmt":"2025-08-18T14:40:40","slug":"branch-circuit-currents","status":"publish","type":"normativa_tecnica","link":"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/branch-circuit-currents\/","title":{"rendered":"UL 508A &#8211; Branch Circuit Currents"},"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                    <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\/2\"\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\/FLAFLC-150x150.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 300px)\"\r\n                                width=\"300\"\r\n                                height=\"220\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/FLAFLC-300x220.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 500px)\"\r\n                                width=\"500\"\r\n                                height=\"367\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/FLAFLC.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 500px)\"\r\n                                width=\"500\"\r\n                                height=\"367\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/FLAFLC.png.webp\"\r\n                                type=\"image\/webp\"\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\/FLAFLC.png.webp\"\r\n                                                        title=\"FLAFLC\"\r\n                                                        type=\"image\/webp\"\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=\"text-align: justify;\">Each motor has two&nbsp;current values:<\/p>\n<ul>\n<li style=\"text-align: justify;\"><strong>FLA<\/strong>: &quot;Full-Load Ampere&quot;, is the rated current of the motor, written as nameplate data and indicated in the NEC with the name &quot;Nameplate FLC&quot;.<\/li>\n<li style=\"text-align: justify;\"><strong>FLC<\/strong>:<strong> <\/strong>&quot;Full-Load motor-running Current&quot;, is a value of current chosen from table 50.1 of UL 508A. Given the motor power&nbsp;expressed in HP, the FLC represents the maximum current that can be absorbed by the motor in the&nbsp;worst case.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">Each&nbsp;component&nbsp;of the branch circuit (conductors, fuses, circuit breakers, etc.), except for&nbsp;overload relays, must be sized&nbsp;focusing on&nbsp;the FLC;&nbsp;the reason is that, once the motor power is fixed in HP, the FLC represents the highest current that the motor rated at that power can absorb. Therefore, if the motor is replaced by another motor of equal power, it is not necessary to replace the other elements of the branch circuit due to a possible higher current absorbed by the load.<\/p>\n<p>The overload relay,&nbsp;as its tripping characteristic is adjustable, must be sized focusing on the FLA .<\/p>\n<p>&nbsp;<\/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>Each motor has two current values:<br \/>\n-FLA<br \/>\n-FLC<\/p>\n","protected":false},"author":1,"featured_media":4164,"parent":4095,"menu_order":8,"template":"","meta":{"_acf_changed":false,"footnotes":""},"normative-tecniche":[59],"class_list":["post-4163","normativa_tecnica","type-normativa_tecnica","status-publish","has-post-thumbnail","hentry","tipologia_normativa-ul-and-nfpa-standards"],"acf":{"sottotitolo":"FLA and FLC as stated in UL508A","allegati":null},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>UL 508A - Branch Circuit Currents<\/title>\n<meta name=\"description\" content=\"...\" \/>\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\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/branch-circuit-currents\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"UL 508A - Branch Circuit Currents\" \/>\n<meta property=\"og:description\" content=\"...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/branch-circuit-currents\/\" \/>\n<meta property=\"og:site_name\" content=\"Gt-Engineering\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-18T14:40:40+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/FLAFLC.png\" \/>\n\t<meta property=\"og:image:width\" content=\"500\" \/>\n\t<meta property=\"og:image:height\" content=\"367\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"UL 508A - Branch Circuit Currents\" \/>\n<meta name=\"twitter:description\" content=\"...\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/branch-circuit-currents\/\",\"url\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/branch-circuit-currents\/\",\"name\":\"UL 508A - Branch Circuit Currents\",\"isPartOf\":{\"@id\":\"https:\/\/www.gt-engineering.it\/en\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/branch-circuit-currents\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/branch-circuit-currents\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/FLAFLC.png\",\"datePublished\":\"2023-01-05T13:16:33+00:00\",\"dateModified\":\"2025-08-18T14:40:40+00:00\",\"description\":\"...\",\"breadcrumb\":{\"@id\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/branch-circuit-currents\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/branch-circuit-currents\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/branch-circuit-currents\/#primaryimage\",\"url\":\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/FLAFLC.png\",\"contentUrl\":\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/FLAFLC.png\",\"width\":500,\"height\":367},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/branch-circuit-currents\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.gt-engineering.it\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Technical standards\",\"item\":\"https:\/\/www.gt-engineering.it\/en\/normative-tecniche\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"UL &amp; 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