{"id":5220,"date":"2025-06-09T07:55:13","date_gmt":"2025-06-09T07:55:13","guid":{"rendered":"https:\/\/www.caviterm.com\/temperatura-massima-cavi-elettrici\/"},"modified":"2026-04-27T08:55:16","modified_gmt":"2026-04-27T08:55:16","slug":"maximum-temperature-of-electrical-cables-regulatory-values-materials-and-current-carrying-capacity-tables","status":"publish","type":"post","link":"https:\/\/www.caviterm.com\/en\/maximum-temperature-of-electrical-cables-regulatory-values-materials-and-current-carrying-capacity-tables\/","title":{"rendered":"Maximum temperature of electrical cables: regulatory values, materials, and current-carrying capacity tables"},"content":{"rendered":"<p>Maximum electrical cable temperature: regulatory values, materials, and current-carrying capacity tables<\/p>\n<p>The selection and sizing of electrical cables is not based only on the current to be carried, but also on the maximum temperature the cable can withstand without compromising the safety or performance of the system. The <strong>maximum temperature of electrical cables<\/strong> is a crucial parameter to <strong>prevent overheating<\/strong>, <strong>premature aging<\/strong> of the insulation, and, in the most serious cases, short circuits.<\/p>\n<p>In this article we will analyze regulatory values, material behavior, current-carrying capacity tables, and selection criteria for correctly choosing cables based on temperature.<\/p>\n<h2>What is the maximum temperature of an electrical cable and why is it essential<\/h2>\n<p>The maximum temperature of an electrical cable is the <strong>value beyond which the insulation and conductive materials begin to deteriorate<\/strong> irreversibly. This limit varies depending on the type of insulating material used:<\/p>\n<table style=\"border: 1px solid black; border-collapse: collapse;\">\n<thead>\n<tr style=\"background-color: #7f7f7f; color: #fff; font-weight: bold;\">\n<th style=\"border: 1px solid black; padding: 5px; text-align: left;\">Insulation type<\/th>\n<th style=\"border: 1px solid black; padding: 5px;\">Maximum operating temperature<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"background-color: #d9d9d9; font-weight: bold; border: 1px solid black; padding: 5px;\">PVC<\/td>\n<td style=\"border: 1px solid black; padding: 5px;\">90\u00b0C and 105\u00b0C<\/td>\n<\/tr>\n<tr>\n<td style=\"background-color: #d9d9d9; font-weight: bold; border: 1px solid black; padding: 5px;\">Silicone<\/td>\n<td style=\"border: 1px solid black; padding: 5px;\">180\u00b0C<\/td>\n<\/tr>\n<tr>\n<td style=\"background-color: #d9d9d9; font-weight: bold; border: 1px solid black; padding: 5px;\">PTFE (Teflon)<\/td>\n<td style=\"border: 1px solid black; padding: 5px;\">250\u00b0C<\/td>\n<\/tr>\n<tr>\n<td style=\"background-color: #d9d9d9; font-weight: bold; border: 1px solid black; padding: 5px;\">Glass fiber<\/td>\n<td style=\"border: 1px solid black; padding: 5px;\">450\u00b0C<\/td>\n<\/tr>\n<tr>\n<td style=\"background-color: #d9d9d9; font-weight: bold; border: 1px solid black; padding: 5px;\">Special glass fiber<\/td>\n<td style=\"border: 1px solid black; padding: 5px;\">700\u00b0C<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Exceeding these limits can lead to <strong>loss of insulation<\/strong>, <strong>short circuits<\/strong>, or <strong>fire hazards<\/strong>. The <a href=\"https:\/\/www.ceinorme.it\/en\/standards\/\"><strong>CEI standards<\/strong><\/a> take these values into account to define test conditions and operating limits.<\/p>\n<h2>Factors influencing the maximum temperature of cables<\/h2>\n<p>The <strong>maximum temperature<\/strong> reached by a cable <strong>depends on several factors<\/strong>:<\/p>\n<ul>\n<li><strong>Electrical current<\/strong>: the higher the current, the greater the heat generation (Joule effect).<\/li>\n<li><strong>Installation method<\/strong>: buried, in air, in conduit, in trunking. It affects heat dissipation.<\/li>\n<li><strong>Ambient temperature<\/strong>: a hotter environment reduces the cable\u2019s cooling capacity.<\/li>\n<li><strong>Cable grouping<\/strong>: multiple cables close together generate additional heat.<\/li>\n<li><strong>Ventilation<\/strong>: the presence or absence of airflow improves or worsens heat dissipation.<\/li>\n<li><strong>Exposure duration<\/strong>: the time the cable is subjected to high temperatures matters as much as the peak value.<\/li>\n<\/ul>\n<h2>Current-carrying capacity tables and maximum temperature<\/h2>\n<p>The <strong>current-carrying capacity tables<\/strong> (<strong>CEI-UNEL<\/strong>) indicate the <strong>maximum allowable current<\/strong> for cables depending on operating temperature and installation conditions.<\/p>\n<table style=\"width: 100%; border-collapse: collapse; border: 1px solid black;\">\n<thead>\n<tr style=\"background-color: #7f7f7f; color: white; font-weight: bold;\">\n<th style=\"border: 1px solid black; padding: 8px; text-align: left;\">Nominal cross-section [mm\u00b2]<\/th>\n<th style=\"border: 1px solid black; padding: 8px; text-align: left;\">Current capacity in air [A]<\/th>\n<th style=\"border: 1px solid black; padding: 8px; text-align: left;\">Max temperature [\u00b0C]<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"background-color: #d3d3d3; border: 1px solid black; padding: 8px;\">1.5<\/td>\n<td style=\"border: 1px solid black; padding: 8px;\">25<\/td>\n<td style=\"border: 1px solid black; padding: 8px;\">90<\/td>\n<\/tr>\n<tr>\n<td style=\"background-color: #d3d3d3; border: 1px solid black; padding: 8px;\">2.5<\/td>\n<td style=\"border: 1px solid black; padding: 8px;\">33<\/td>\n<td style=\"border: 1px solid black; padding: 8px;\">90<\/td>\n<\/tr>\n<tr>\n<td style=\"background-color: #d3d3d3; border: 1px solid black; padding: 8px;\">4<\/td>\n<td style=\"border: 1px solid black; padding: 8px;\">46<\/td>\n<td style=\"border: 1px solid black; padding: 8px;\">90<\/td>\n<\/tr>\n<tr>\n<td style=\"background-color: #d3d3d3; border: 1px solid black; padding: 8px;\">6<\/td>\n<td style=\"border: 1px solid black; padding: 8px;\">60<\/td>\n<td style=\"border: 1px solid black; padding: 8px;\">90<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Behavior of materials at different temperatures<\/h2>\n<p><strong>Each material<\/strong> used in cables <strong>has a thermal limit<\/strong> beyond which chemical and mechanical degradation occurs. Below is a comparison of the most common materials:<\/p>\n<table style=\"width: 100%; border-collapse: collapse; border: 1px solid black;\">\n<thead>\n<tr style=\"background-color: #7f7f7f; color: white; font-weight: bold;\">\n<th style=\"border: 1px solid black; padding: 8px; text-align: left;\">Insulation material<\/th>\n<th style=\"border: 1px solid black; padding: 8px; text-align: left;\">Main advantages<\/th>\n<th style=\"border: 1px solid black; padding: 8px; text-align: left;\">Thermal limits<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"background-color: #d3d3d3; font-weight: bold; border: 1px solid black; padding: 8px;\">PVC<\/td>\n<td style=\"border: 1px solid black; padding: 8px;\">Economical, good dielectric properties<\/td>\n<td style=\"border: 1px solid black; padding: 8px;\">Becomes rigid above 70\u00b0C<\/td>\n<\/tr>\n<tr>\n<td style=\"background-color: #d3d3d3; font-weight: bold; border: 1px solid black; padding: 8px;\">Silicone<\/td>\n<td style=\"border: 1px solid black; padding: 8px;\">Excellent heat resistance and flexibility<\/td>\n<td style=\"border: 1px solid black; padding: 8px;\">Excellent up to 180\u00b0C<\/td>\n<\/tr>\n<tr>\n<td style=\"background-color: #d3d3d3; font-weight: bold; border: 1px solid black; padding: 8px;\">PTFE (Teflon)<\/td>\n<td style=\"border: 1px solid black; padding: 8px;\">Excellent dielectric properties<\/td>\n<td style=\"border: 1px solid black; padding: 8px;\">Resists up to 250\u00b0C<\/td>\n<\/tr>\n<tr>\n<td style=\"background-color: #d3d3d3; border: 1px solid black; padding: 8px;\">Glass fiber<\/td>\n<td style=\"border: 1px solid black; padding: 8px;\">High thermal stability, flame resistant<\/td>\n<td style=\"border: 1px solid black; padding: 8px;\">Resists up to 450\u00b0C<\/td>\n<\/tr>\n<tr>\n<td style=\"background-color: #d3d3d3; border: 1px solid black; padding: 8px;\">Special glass fiber<\/td>\n<td style=\"border: 1px solid black; padding: 8px;\">Extreme high-temperature resistance<\/td>\n<td style=\"border: 1px solid black; padding: 8px;\">Resists up to 700\u00b0C<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Regulations for maximum cable temperature<\/h2>\n<p>The main <strong>standards<\/strong> governing the selection and use of electrical cables based on maximum operating temperature are:<\/p>\n<ul>\n<li><a href=\"https:\/\/mycatalogo.ceinorme.it\/book\/item\/00M000253?sso=y&amp;lang=en\"><strong>CEI 64-8<\/strong><\/a>: defines criteria for sizing and protection against overheating.<\/li>\n<li><a href=\"https:\/\/mycatalogo.ceinorme.it\/cei\/item\/0000025321?sso=y&amp;lang=en\"><strong>CEI EN 60228<\/strong><\/a>: classifies conductors based on cross-section and resistance.<\/li>\n<li><a href=\"https:\/\/mycatalogo.ceinorme.it\/cei\/item\/0000017456?lang=en\"><strong>CEI UNEL 35024<\/strong><\/a>: current-carrying capacity tables for cables under different conditions.<\/li>\n<li><a href=\"https:\/\/mycatalogo.ceinorme.it\/cei\/item\/0000015056?lang=en\"><strong>CEI EN 50565<\/strong><\/a>: installation conditions and methods.<\/li>\n<\/ul>\n<p>Correct application of these standards is essential to ensure system safety.<\/p>\n<h2>How to choose the right cables based on maximum temperature<\/h2>\n<p>For a <strong>correct cable selection<\/strong> based on maximum temperature, follow these steps:<\/p>\n<ol>\n<li><strong>Define the nominal current<\/strong> of the system.<\/li>\n<li><strong>Evaluate ambient temperature<\/strong> and installation conditions.<\/li>\n<li><strong>Consult CEI-UNEL standards tables<\/strong> to determine the minimum cable cross-section.<\/li>\n<li><strong>Apply correction factors<\/strong> for temperature, grouping, or installation in critical environments.<\/li>\n<li><strong>Choose a suitable insulation material<\/strong> for the expected thermal conditions.<\/li>\n<li><strong>Check electromechanical compatibility<\/strong> with switchboards and protection devices.<\/li>\n<\/ol>\n<p>The maximum temperature of electrical cables is a <strong>fundamental parameter for designing safe and reliable installations<\/strong>. Knowing material limits, correctly interpreting regulatory tables, and assessing environmental conditions allows you to always choose the most suitable cable.<\/p>\n<h2>Caviterm support for high-temperature applications<\/h2>\n<p><strong>Caviterm<\/strong> supports industry professionals with <strong>high-temperature cables<\/strong> for every need, up-to-date tables, and <strong>custom solutions<\/strong>.<br \/>\n<strong>Contact us<\/strong> for more information.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Maximum electrical cable temperature: regulatory values, materials, and current-carrying capacity tables The selection and sizing of electrical cables is not based only on the current to be carried, but also on the maximum temperature the cable can withstand without compromising the safety or performance of the system. The maximum temperature of electrical cables is a [&hellip;]<\/p>\n","protected":false},"author":32,"featured_media":4543,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-5220","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-categorizzato"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Maximum temperature of electrical cables | Caviterm<\/title>\n<meta name=\"description\" content=\"Guide to the thermal limits of electrical cables: capacity tables, materials, and standards. 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