{"id":7947,"date":"2017-09-15T09:10:50","date_gmt":"2017-09-15T07:10:50","guid":{"rendered":"https:\/\/blog.wika.com\/en\/?p=7947"},"modified":"2021-10-07T14:21:07","modified_gmt":"2021-10-07T12:21:07","slug":"ul-recognized-ul-listing-whats-the-difference","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/en\/knowhow\/ul-recognized-ul-listing-whats-the-difference\/","title":{"rendered":"\u201cUL Recognized\u201d, \u201cUL Listing\u201d \u2013 What’s the difference?"},"content":{"rendered":"

The \u201cUL approval\u201d is an important and well-known product approval. That there are different approvals for \u201cUL\u201d (\u201cUnderwriters Laboratories\u201d) is, however, less known.<\/strong><\/p>\n\n

\"Ul

Fig. left: \u201cUL Listing\u201d marking for Canada and the USA Fig. right: \u201cUL Recognized Component\u201d marking for Canada and the USA<\/p><\/div>\n \n

When one talks in general about \u201cUL approval\u201d, in most cases \u201cUL Listing\u201d is meant. In addition to \u201cUL Listing\u201d, however, the approval \u201cUL Recognized Component\u201d can also be obtained for specific products. Depending on which approval is needed for an instrument, an individual marking is required (see figure).<\/p>\n

But where does the difference in the two \u201cUL approvals\u201d lie?<\/h2>\n

Products with \u201cUL Listing\u201d correspond to a final product (end product) or a component for installations in the field. These products have been tested accordingly and can be installed, taking the applicable local installation guidelines into account, e.g. ANSI\/NFPA 70, \u201cNational Electrical Code\u201d (NEC).<\/p>\n

Whereas a product with \u201cUL Recognized Component\u201d is not directly intended for exclusive or direct installation in the field. Rather, as the name of the approval implies, these products are intended as a component of a system for which a \u201cUL Listing\u201d should be obtained. The installation of such components is typically carried out in a factory and not in the field. The product (which is to be considered as a component in the sense of \u201cUL approval\u201d) has passed through certain tests and evaluations for the specific system during the approval as a \u201cUL Recognized Component\u201d, thereby simplifying the \u201cUL Listing\u201d of the complete system.<\/p>\n

The WIKA model R-1<\/a> pressure sensor for the HVAC +R (heating, ventilation, air-conditioning and refrigeration) industry can be taken as an example. For these instruments, an approval<\/a> as \u201cUL Recognized Component\u201d for the cooling industry \u201cComponent \u2013 Controllers, Refrigeration\u201d was obtained. This simplifies the work for manufacturers of refrigeration systems and plants in obtaining the \u201cUL Listing\u201d for the complete unit.<\/p>\n","protected":false},"excerpt":{"rendered":"

The \u201cUL approval\u201d is an important and well-known product approval. That there are different approvals for \u201cUL\u201d (\u201cUnderwriters Laboratories\u201d) is, however, less known. When one talks in general about \u201cUL approval\u201d, in most cases \u201cUL Listing\u201d is meant. In addition to \u201cUL Listing\u201d, however, the approval \u201cUL Recognized Component\u201d can also be obtained for specific […]<\/p>\n","protected":false},"author":161,"featured_media":7946,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[5],"tags":[77,251],"class_list":["post-7947","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowhow","tag-pressure-sensor","tag-standards-approvals-directive"],"acf":[],"yoast_head":"\nDifference between "UL Recognized" and "UL Listing"<\/title>\n<meta name=\"description\" content=\"The \u201cUL approval\u201d is an important and well-known product approval. That there are different approvals for \u201cUL\u201d is, however, less known.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.wika.com\/en\/knowhow\/ul-recognized-ul-listing-whats-the-difference\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Difference between "UL Recognized" and "UL Listing"\" \/>\n<meta property=\"og:description\" content=\"The \u201cUL approval\u201d is an important and well-known product approval. That there are different approvals for \u201cUL\u201d is, however, less known.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.wika.com\/en\/knowhow\/ul-recognized-ul-listing-whats-the-difference\/\" \/>\n<meta property=\"og:site_name\" content=\"WIKA blog\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blog.wika.com\/en\/files\/2017\/06\/ul-recognised_vs_ul-listed.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"838\" \/>\n\t<meta property=\"og:image:height\" content=\"471\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Jens Bargon\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jens Bargon\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/blog.wika.com\/en\/knowhow\/ul-recognized-ul-listing-whats-the-difference\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/blog.wika.com\/en\/knowhow\/ul-recognized-ul-listing-whats-the-difference\/\"},\"author\":{\"name\":\"Jens Bargon\",\"@id\":\"https:\/\/blog.wika.com\/en\/#\/schema\/person\/8d21ce320046fce88a41e943fd8e9ae7\"},\"headline\":\"\u201cUL Recognized\u201d, \u201cUL Listing\u201d \u2013 What’s the difference?\",\"datePublished\":\"2017-09-15T07:10:50+00:00\",\"dateModified\":\"2021-10-07T12:21:07+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/blog.wika.com\/en\/knowhow\/ul-recognized-ul-listing-whats-the-difference\/\"},\"wordCount\":330,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/blog.wika.com\/en\/knowhow\/ul-recognized-ul-listing-whats-the-difference\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blog.wika.com\/en\/files\/2017\/06\/ul-recognised_vs_ul-listed.jpg\",\"keywords\":[\"Pressure sensor\",\"Standards\/approvals\/directives\"],\"articleSection\":[\"Know-how\"],\"inLanguage\":\"en-GB\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blog.wika.com\/en\/knowhow\/ul-recognized-ul-listing-whats-the-difference\/\",\"url\":\"https:\/\/blog.wika.com\/en\/knowhow\/ul-recognized-ul-listing-whats-the-difference\/\",\"name\":\"Difference between \\\"UL Recognized\\\" and \\\"UL Listing\\\"\",\"isPartOf\":{\"@id\":\"https:\/\/blog.wika.com\/en\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blog.wika.com\/en\/knowhow\/ul-recognized-ul-listing-whats-the-difference\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blog.wika.com\/en\/knowhow\/ul-recognized-ul-listing-whats-the-difference\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blog.wika.com\/en\/files\/2017\/06\/ul-recognised_vs_ul-listed.jpg\",\"datePublished\":\"2017-09-15T07:10:50+00:00\",\"dateModified\":\"2021-10-07T12:21:07+00:00\",\"author\":{\"@id\":\"https:\/\/blog.wika.com\/en\/#\/schema\/person\/8d21ce320046fce88a41e943fd8e9ae7\"},\"description\":\"The \u201cUL approval\u201d is an important and well-known product approval. 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