{"id":1855,"date":"2023-02-22T11:41:34","date_gmt":"2023-02-22T10:41:34","guid":{"rendered":"https:\/\/www.gt-engineering.it\/approfondimenti\/%tipologia_approfondimento%\/rcd-and-type-g-protection\/"},"modified":"2023-05-10T10:33:52","modified_gmt":"2023-05-10T09:33:52","slug":"rcd-and-type-g-protection","status":"publish","type":"approfondimento","link":"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/","title":{"rendered":"Type G and residual current devices: what are the differences?"},"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 style=\"text-align: justify;\">&nbsp;<\/p>\n<p style=\"text-align: justify;\"><strong>THE DOUBT<\/strong><br \/>What are the differences between <strong>RCDs<\/strong> and <strong>Type G <\/strong>Ground Fault Protections?<\/p>\n<p style=\"text-align: justify;\">&nbsp;<\/p>\n<p style=\"text-align: justify;\"><strong>CONSIDERATIONS<\/strong><br \/>Among possible causes of electric shock there are the Indirect Contacts: following a Ground Fault, for example caused by defective insulation, the current can flow through an exposed conductive part, and a person may die in case he touches it.<\/p>\n<p style=\"text-align: justify;\"><strong>Both type G and Residual Current Devices operate to protect against Indirect Contact (Fault Protection)<\/strong>&nbsp;and both act on the same principle. In a normal three-phase current distribution, the vector sum of the three phase currents (and of the neutral, if distributed) is zero. In the event of a ground fault, the phase involved in the failure undergoes a significant variation and we have a non-zero sum. <strong>Both types of protection act by keeping under control the vector sum of the Three phases<\/strong> (and the neutral, if distributed), interrupting the circuit when non-zero sum is occurs. So what&#39;s the difference?<br \/>&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\/schema-eng-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=\"143\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/schema-eng-300x143.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=\"365\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/schema-eng-768x365.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 846px)\"\r\n                                width=\"846\"\r\n                                height=\"402\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/schema-eng.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\/schema-eng.png.webp\"\r\n                                                        title=\"schema-eng\"\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;\"><strong>The switches with Curve G <\/strong>(as in Ground Fault) <strong>work with electronic control:<\/strong>&nbsp;Moulded Case Circuit Breakers use phase TA to monitor the&nbsp;current to guarantee protection against overcurrents; these same phase TA, detecting the current for each phase and, separately, the voltage, recreate the&nbsp; current vectors and then calculate the vector sum: if the sum is not zero, the switch triggers. The phase TA are not extremely precise, and the calculation error could trigger the switch frequently if calibrated to low current value; to prevent unnecessary switch triggers, <strong>the sensibility of the G curve can be calibrated&nbsp;to values equal or higher than 0.2 I<sub>n<\/sub><\/strong>. Being an electronic instrument, it is very versatile, the intervention current and any scheduled delay can be programmed as needed.<\/p>\n<p style=\"text-align: justify;\"><strong>Residual current devices, or RCDs, work through a physical measure of the 3 phases<\/strong>: the cables pass through a toroid, a not-zero sum&nbsp;triggers the switch and interrupts the circuit. This method of measurement is much more precise, and therefore allows you to rely on this type of protection for <strong>high sensibility applications, such as domestic use<\/strong>. Legislation imposes RCDs with sensibility of 30 mA for Europe, of 6 mA for North America. In this case too, manufacturers provide more complex models with changeable sensibility and activation times, to promote selectivity between plant protections, for example in the industrial sector.<\/p>\n<p style=\"text-align: justify;\">&nbsp;<\/p>\n<p style=\"text-align: justify;\"><strong>CONCLUSION<\/strong><br \/><strong>RCDs and switches with curve G have the same objective<\/strong>, Fault protection, <strong>and the same basic principle<\/strong>, activation according to the variation of the vector sum of the currents. <strong>The differences are on the way of measuring the sum of currents, and on the sensibility to which they can operate.<\/strong><br \/>&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>&nbsp;<\/p>\n<p>THE DOUBT<br \/>\nWhat are the differences between RCDs and Type G Ground Fault Protections?<\/p>\n<p>&nbsp;<\/p>\n<p>CONSIDERATIONS<br \/>\nAmong possible causes of electric shock the&#8230;<\/p>\n","protected":false},"author":1,"featured_media":1856,"parent":0,"menu_order":85,"template":"","meta":{"_acf_changed":false,"footnotes":""},"tipologia_approfondimento":[51],"class_list":["post-1855","approfondimento","type-approfondimento","status-publish","has-post-thumbnail","hentry","tipologia_approfondimento-electrical-hazard-and-arc-flash-mitigation"],"acf":{"sottotitolo":"","allegati":null},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>TYPE G AND RESIDUAL CURRENT DEVICES: WHAT ARE THE DIFFERENCES?<\/title>\n<meta name=\"description\" content=\"\u00a0 THE DOUBT What are the differences between RCDs&lt;\/stro...\" \/>\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\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"TYPE G AND RESIDUAL CURRENT DEVICES: WHAT ARE THE DIFFERENCES?\" \/>\n<meta property=\"og:description\" content=\"\u00a0 THE DOUBT What are the differences between RCDs&lt;\/stro...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/\" \/>\n<meta property=\"og:site_name\" content=\"Gt-Engineering\" \/>\n<meta property=\"article:modified_time\" content=\"2023-05-10T09:33:52+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/copertina-21.jpg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"TYPE G AND RESIDUAL CURRENT DEVICES: WHAT ARE THE DIFFERENCES?\" \/>\n<meta name=\"twitter:description\" content=\"\u00a0 THE DOUBT What are the differences between RCDs&lt;\/stro...\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/copertina-21.jpg\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/\",\"url\":\"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/\",\"name\":\"TYPE G AND RESIDUAL CURRENT DEVICES: WHAT ARE THE DIFFERENCES?\",\"isPartOf\":{\"@id\":\"https:\/\/www.gt-engineering.it\/en\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/copertina-21.jpg\",\"datePublished\":\"2023-02-22T10:41:34+00:00\",\"dateModified\":\"2023-05-10T09:33:52+00:00\",\"description\":\"\u00a0 THE DOUBT What are the differences between RCDs&lt;\/stro...\",\"breadcrumb\":{\"@id\":\"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/#primaryimage\",\"url\":\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/copertina-21.jpg\",\"contentUrl\":\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/copertina-21.jpg\",\"width\":800,\"height\":800,\"caption\":\"TYPE G AND RESIDUAL CURRENT DEVICES: WHAT ARE THE DIFFERENCES?\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.gt-engineering.it\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Insights\",\"item\":\"https:\/\/www.gt-engineering.it\/en\/approfondimenti\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Electrical Safety and Arc Flash Mitigation\",\"item\":\"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/\"},{\"@type\":\"ListItem\",\"position\":4,\"name\":\"Type G and residual current devices: what are the differences?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.gt-engineering.it\/en\/#website\",\"url\":\"https:\/\/www.gt-engineering.it\/en\/\",\"name\":\"Gt-Engineering\",\"description\":\"bizonweb\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.gt-engineering.it\/en\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"TYPE G AND RESIDUAL CURRENT DEVICES: WHAT ARE THE DIFFERENCES?","description":"\u00a0 THE DOUBT What are the differences between RCDs&lt;\/stro...","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/","og_locale":"en_US","og_type":"article","og_title":"TYPE G AND RESIDUAL CURRENT DEVICES: WHAT ARE THE DIFFERENCES?","og_description":"\u00a0 THE DOUBT What are the differences between RCDs&lt;\/stro...","og_url":"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/","og_site_name":"Gt-Engineering","article_modified_time":"2023-05-10T09:33:52+00:00","og_image":[{"url":"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/copertina-21.jpg","type":"","width":"","height":""}],"twitter_card":"summary_large_image","twitter_title":"TYPE G AND RESIDUAL CURRENT DEVICES: WHAT ARE THE DIFFERENCES?","twitter_description":"\u00a0 THE DOUBT What are the differences between RCDs&lt;\/stro...","twitter_image":"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/copertina-21.jpg","schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/","url":"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/","name":"TYPE G AND RESIDUAL CURRENT DEVICES: WHAT ARE THE DIFFERENCES?","isPartOf":{"@id":"https:\/\/www.gt-engineering.it\/en\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/#primaryimage"},"image":{"@id":"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/#primaryimage"},"thumbnailUrl":"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/copertina-21.jpg","datePublished":"2023-02-22T10:41:34+00:00","dateModified":"2023-05-10T09:33:52+00:00","description":"\u00a0 THE DOUBT What are the differences between RCDs&lt;\/stro...","breadcrumb":{"@id":"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/#primaryimage","url":"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/copertina-21.jpg","contentUrl":"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/copertina-21.jpg","width":800,"height":800,"caption":"TYPE G AND RESIDUAL CURRENT DEVICES: WHAT ARE THE DIFFERENCES?"},{"@type":"BreadcrumbList","@id":"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/rcd-and-type-g-protection\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.gt-engineering.it\/en\/"},{"@type":"ListItem","position":2,"name":"Insights","item":"https:\/\/www.gt-engineering.it\/en\/approfondimenti\/"},{"@type":"ListItem","position":3,"name":"Electrical Safety and Arc Flash Mitigation","item":"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/"},{"@type":"ListItem","position":4,"name":"Type G and residual current devices: what are the differences?"}]},{"@type":"WebSite","@id":"https:\/\/www.gt-engineering.it\/en\/#website","url":"https:\/\/www.gt-engineering.it\/en\/","name":"Gt-Engineering","description":"bizonweb","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.gt-engineering.it\/en\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/www.gt-engineering.it\/en\/wp-json\/wp\/v2\/approfondimento\/1855","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gt-engineering.it\/en\/wp-json\/wp\/v2\/approfondimento"}],"about":[{"href":"https:\/\/www.gt-engineering.it\/en\/wp-json\/wp\/v2\/types\/approfondimento"}],"author":[{"embeddable":true,"href":"https:\/\/www.gt-engineering.it\/en\/wp-json\/wp\/v2\/users\/1"}],"version-history":[{"count":7,"href":"https:\/\/www.gt-engineering.it\/en\/wp-json\/wp\/v2\/approfondimento\/1855\/revisions"}],"predecessor-version":[{"id":33246,"href":"https:\/\/www.gt-engineering.it\/en\/wp-json\/wp\/v2\/approfondimento\/1855\/revisions\/33246"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gt-engineering.it\/en\/wp-json\/wp\/v2\/media\/1856"}],"wp:attachment":[{"href":"https:\/\/www.gt-engineering.it\/en\/wp-json\/wp\/v2\/media?parent=1855"}],"wp:term":[{"taxonomy":"tipologia_approfondimento","embeddable":true,"href":"https:\/\/www.gt-engineering.it\/en\/wp-json\/wp\/v2\/tipologia_approfondimento?post=1855"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}