{"id":4149,"date":"2023-01-05T14:16:20","date_gmt":"2023-01-05T13:16:20","guid":{"rendered":"https:\/\/www.gt-engineering.it\/normative-tecniche\/%tipologia_normativa%\/cable-ampacity-ul-508a\/"},"modified":"2025-08-18T15:33:53","modified_gmt":"2025-08-18T14:33:53","slug":"cable-ampacity-ul-508a","status":"publish","type":"normativa_tecnica","link":"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/cable-ampacity-ul-508a\/","title":{"rendered":"UL 508A &#8211; Ampacities of Conductors"},"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\/3\"\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\/UL-508A-Ampacities-150x150.jpg.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 300px)\"\r\n                                width=\"300\"\r\n                                height=\"225\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/UL-508A-Ampacities-300x225.jpg.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 768px)\"\r\n                                width=\"768\"\r\n                                height=\"576\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/UL-508A-Ampacities-768x576.jpg.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 1024px)\"\r\n                                width=\"1024\"\r\n                                height=\"768\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/UL-508A-Ampacities-1024x768.jpg.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\/UL-508A-Ampacities.jpg.webp\"\r\n                                                        title=\"UL 508A &#8211; Ampacities\"\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>The size of <strong>insulated conductors<\/strong> inside an industrial control panel cannot be smaller than <strong>14 AWG<\/strong>. Actually, for Industrial Machineries, for low rated power motors,&nbsp;conductors smaller than AWG 14 can be used inside the control panel: please refer to&nbsp;Table 66.2.<\/p>\n<p>In order to calculate a&nbsp;conductor size,&nbsp;inside control panels, the motor FLC must be&nbsp;increased by 25%: that&nbsp;becomes&nbsp;the minimum ampacity&nbsp;the conductor must have.<\/p>\n<p>In general, conductor ampacities of power circuits,&nbsp;inside control panels, are stated in Table 28.1 of UL 508A, while for c<strong>ontrol circuits&nbsp;<\/strong>the table to be used is&nbsp;<strong>Table 38.1<\/strong>.<\/p>\n<p>Going back to the power circuits, it&nbsp;is also mandatory to use conductors that can withstand 90&deg;C, <strong>but they cannot exceed 75&deg;C in temperatura<\/strong>: that means their ampacity will be lower, since we cannot bring them up to 90&deg;C, like we do in Europe or, in general, following for example IEC 60204-1. But when table 28.1 is consulted you may have a doubt about which column to choose: the 60&deg;C or the 75&deg;C column.<\/p>\n<p><strong>For example,<\/strong> if a motor has an FLC of 50 A, I have to use a cable with an ampacity of at least 62,5&nbsp;A. Shall I than use an AWG 4 (@60&deg;C the ampacity is 70 A) or an AWG 6 (@75&deg;C the ampacity is 65&nbsp;A). That has always been implicit, since it is clearly explained in the NEC. However that has often generated doubts and confusion.<\/p>\n<p><strong>In the 2022 update of the standard,<\/strong> it is explained when to use the 60&deg;C colum and when the 75&deg;C can be used. Hereafter the key language.<\/p>\n<blockquote>\n<p>[UL 508A: 2022] 29.6 Sizing<br \/>[&hellip;]<br \/>The wire temperature rating(s) marked on the component or in the instructions shall be used to select the appropriate column(s) from Table 28.1 as follows :<br \/>1)&nbsp;&nbsp; &nbsp;[&hellip;]<br \/>4)&nbsp;&nbsp; &nbsp;If the component markings or instructions <strong>do not specify a wire temperature rating<\/strong>, the conductor size shall be determined <strong>using the ampacities in the 60&deg;C column in Table 28.1<\/strong> when the component is rated 100 amps or less, and the 75&deg;C column in Table 28.1 when the component is rated greater than 100 amps.<\/p>\n<\/blockquote>\n<p>Going back to our example, let&#39;s assume to use a SIEMENS <strong>3RV2042-4JA10<\/strong> with setting 45-63A. Since nothing is indicated on its E47705 certificate on the maximum temperature of its terminals, since the component has a nominal current of less than 100 A, we must take the 60&deg;C column&nbsp;and therefore&nbsp;select&nbsp;an <strong>AWG 4 cable.<\/strong><\/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\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        \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\/Table-28.12-150x150.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 252px)\"\r\n                                width=\"252\"\r\n                                height=\"300\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/Table-28.12-252x300.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 696px)\"\r\n                                width=\"696\"\r\n                                height=\"829\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/Table-28.12.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 696px)\"\r\n                                width=\"696\"\r\n                                height=\"829\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/Table-28.12.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\/Table-28.12.png.webp\"\r\n                                                        title=\"Table-28.12\"\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        \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        \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\/Table-38.11-150x150.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=\"163\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/Table-38.11-300x163.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 768px)\"\r\n                                width=\"768\"\r\n                                height=\"416\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/Table-38.11-768x416.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 779px)\"\r\n                                width=\"779\"\r\n                                height=\"422\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/Table-38.11.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\/Table-38.11.png.webp\"\r\n                                                        title=\"Table-38.11\"\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        \n        \n                <div class=\"clear-both\"><\/div>\n        \n\n    <\/div>\n        <\/section>\n\n    \n","protected":false},"excerpt":{"rendered":"<p>The size of insulated conductors inside an industrial control panel cannot be smaller than 14 AWG. Actually, for Industrial Machineries, for low rated power motors,\u00a0conductors smaller than AWG 14 can be used inside the control panel<\/p>\n","protected":false},"author":1,"featured_media":4150,"parent":4095,"menu_order":6,"template":"","meta":{"_acf_changed":false,"footnotes":""},"normative-tecniche":[59],"class_list":["post-4149","normativa_tecnica","type-normativa_tecnica","status-publish","has-post-thumbnail","hentry","tipologia_normativa-ul-and-nfpa-standards"],"acf":{"sottotitolo":"Ampacity of Power conductors and control circuit conductors according to UL 508A","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 - Ampacities of Conductors<\/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\/cable-ampacity-ul-508a\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"UL 508A - Ampacities of Conductors\" \/>\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\/cable-ampacity-ul-508a\/\" \/>\n<meta property=\"og:site_name\" content=\"Gt-Engineering\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-18T14:33:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/UL-508A-Ampacity-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1920\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"UL 508A - Ampacities of Conductors\" \/>\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\/cable-ampacity-ul-508a\/\",\"url\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/cable-ampacity-ul-508a\/\",\"name\":\"UL 508A - Ampacities of Conductors\",\"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\/cable-ampacity-ul-508a\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/cable-ampacity-ul-508a\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/UL-508A-Ampacity-scaled.jpg\",\"datePublished\":\"2023-01-05T13:16:20+00:00\",\"dateModified\":\"2025-08-18T14:33:53+00:00\",\"description\":\"...\",\"breadcrumb\":{\"@id\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/cable-ampacity-ul-508a\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/cable-ampacity-ul-508a\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/cable-ampacity-ul-508a\/#primaryimage\",\"url\":\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/UL-508A-Ampacity-scaled.jpg\",\"contentUrl\":\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/UL-508A-Ampacity-scaled.jpg\",\"width\":2560,\"height\":1920,\"caption\":\"UL 508A - Ampacities of Conductors\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/ul-and-nfpa-standards\/ul-508a\/cable-ampacity-ul-508a\/#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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