{"id":1761,"date":"2026-01-22T18:26:59","date_gmt":"2026-01-22T18:26:59","guid":{"rendered":"https:\/\/www.lichtgitter.cz\/en\/?post_type=produkty&#038;p=1761"},"modified":"2026-02-24T17:25:48","modified_gmt":"2026-02-24T17:25:48","slug":"zakryti-transformatorovych-jimek-typ-bn-of","status":"publish","type":"produkty","link":"https:\/\/www.lichtgitter.cz\/en\/blog\/produkty\/transformer-pit-covers\/zakryti-transformatorovych-jimek-typ-bn-of\/","title":{"rendered":"BP-H"},"content":{"rendered":" <div class=\"wp-block-uagb-advanced-heading uagb-block-35c0f027\"><h2 class=\"uagb-heading-text\"><strong>Covers for BP-H Type Transformer Pits<\/strong><\/h2><\/div>   <p>For the <strong>covering of transformer pits<\/strong>, the <strong>BP-H sheet metal profile<\/strong> is advantageously used. It consists of a welded wire mesh filled with foam glass granulate. In the event of a fire, this granulate prevents the fire from spreading into the containment basin beneath the transformer and at the same time restricts the access of air to the pit.<br><\/p>   <p><\/p>   <div class=\"wp-block-uagb-advanced-heading uagb-block-e308260b\"><h3 class=\"uagb-heading-text\">Basic properties of foam glass granulate:<\/h3><\/div>   <ul class=\"wp-block-list\"> <li>non-combustibility<\/li>   <li>environmental friendliness<\/li>   <li>chemical resistance<\/li>   <li>resistance to weather conditions<\/li>   <li>very low bulk density<\/li>   <li>long service life and thus stable value<\/li> <\/ul>   <p><br><\/p>   <figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td colspan=\"2\"><strong>BP-H Sheet Metal Profile<\/strong><\/td><\/tr><tr><td>material<\/td><td>steel, hot-dip galvanized<\/td><\/tr><tr><td>length L<\/td><td>up to approx. 2500 mm<\/td><\/tr><tr><td>sheet thickness<\/td><td>2 mm<\/td><\/tr><tr><td>module R<\/td><td>preferably n x 125 mm<\/td><\/tr><tr><td>width B<\/td><td>150, 200, 300 mm<\/td><\/tr><tr><td>height H<\/td><td>75 mm<\/td><\/tr><tr><td>edge fold T<\/td><td>approx. 10 mm<\/td><\/tr><\/tbody><\/table><\/figure>   <p><br><\/p>   <figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"960\" height=\"540\" sizes=\"auto, (max-width: 526px) 100vw, 526px\" src=\"https:\/\/www.lichtgitter.cz\/en\/wp-content\/uploads\/sites\/4\/2026\/01\/BP-H.jpg\" alt=\"\" class=\"wp-image-1762\" style=\"width:526px;height:auto\" srcset=\"https:\/\/www.lichtgitter.cz\/en\/wp-content\/uploads\/sites\/4\/2026\/01\/BP-H.jpg 960w, https:\/\/www.lichtgitter.cz\/en\/wp-content\/uploads\/sites\/4\/2026\/01\/BP-H-300x169.jpg 300w, https:\/\/www.lichtgitter.cz\/en\/wp-content\/uploads\/sites\/4\/2026\/01\/BP-H-768x432.jpg 768w\" \/><\/figure>   <h3 class=\"wp-block-heading\">&nbsp;<\/h3>   <div class=\"wp-block-uagb-advanced-heading uagb-block-b11cceaf\"><h3 class=\"uagb-heading-text\">Simple rules for designing transformer pit covers using BP-H fire-extinguishing profiles<\/h3><\/div>   <p><strong>BP-H profiles<\/strong> require support on only two sides, always at the ends. However, it is recommended that the bearing for <strong>BP-H profiles<\/strong> be provided around the entire perimeter of the pit to ensure better sealing of the basin. When designing the bearing width for BP-H profiles, the required clearances must be taken into account.<br><br>The clearance between the profile and the pit wall in the load-bearing direction should be at least 15 mm on each side; in the non-load-bearing direction, approx. 10 mm per each meter of width. The size of the clearances depends on the basin dimensions, the selected profile arrangement, and their length.<br><br>Regarding profile widths, it is advisable to cover the entire area using the standard production widths of 150, 200, and 300 mm, and to distribute any gaps evenly among the individual profiles. Regarding profile lengths, when designing a new transformer pit it is recommended to use a multiple of the grid module of 125 mm (this is the most cost-effective option). In the case of an already finished basin or during reconstruction, it is possible to add or subtract 1\/4 to 1\/2 of the grid module (a less advantageous option with additional costs). Non-standard lengths and widths can also be manufactured; however, this increases the price and extends the delivery time.<br><br><strong>The maximum production length of BP-H profiles is approx. 2500 mm<\/strong>. For pedestrian loading, the clear span between supports must not exceed 1900 mm; see the load capacity table.<br><\/p>   <p><\/p>   <div class=\"wp-block-uagb-advanced-heading uagb-block-7b954d27\"><h3 class=\"uagb-heading-text\">Attachments<\/h3><\/div>   <p><strong><a href=\"https:\/\/www.lichtgitter.cz\/en\/wp-content\/uploads\/sites\/4\/2026\/01\/nosnostni_tab.bp-h_v1_1441807917.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">Load capacity table for BP-H profiles<\/a><\/strong>&nbsp;(*.pdf )<\/p>   <p><strong><a href=\"https:\/\/www.lichtgitter.cz\/en\/wp-content\/uploads\/sites\/4\/2026\/01\/letak_bp-h_v1_1441807917.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">BP-H leaflet<\/a><\/strong>&nbsp;(*.pdf )<\/p>   <p><\/p> ","protected":false},"excerpt":{"rendered":"<p>Covers for BP-H Type Transformer Pits For the covering of transformer pits, the BP-H sheet metal profile is advantageously used. It consists of a welded wire mesh filled with foam glass granulate. In the event of a fire, this granulate prevents the fire from spreading into the containment basin beneath the transformer and at the [&hellip;]<\/p>\n","protected":false},"featured_media":1762,"parent":601,"menu_order":0,"template":"","categories":[],"tags":[103],"class_list":["post-1761","produkty","type-produkty","status-publish","has-post-thumbnail","hentry","tag-zakryti-trafojimek"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>BP-H - EN | lichtgitter.cz<\/title>\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.lichtgitter.cz\/en\/blog\/produkty\/transformer-pit-covers\/zakryti-transformatorovych-jimek-typ-bn-of\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"BP-H - EN | lichtgitter.cz\" \/>\n<meta property=\"og:description\" content=\"Covers for BP-H Type Transformer Pits For the covering of transformer pits, the BP-H sheet metal profile is advantageously used. 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In the event of a fire, this granulate prevents the fire from spreading into the containment basin beneath the transformer and at the [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.lichtgitter.cz\/en\/blog\/produkty\/transformer-pit-covers\/zakryti-transformatorovych-jimek-typ-bn-of\/\" \/>\n<meta property=\"og:site_name\" content=\"EN | lichtgitter.cz\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-24T17:25:48+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.lichtgitter.cz\/en\/wp-content\/uploads\/sites\/4\/2026\/01\/BP-H.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"960\" \/>\n\t<meta property=\"og:image:height\" content=\"540\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Odhadovan\u00e1 doba \u010dten\u00ed\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minuty\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.lichtgitter.cz\\\/en\\\/blog\\\/produkty\\\/transformer-pit-covers\\\/zakryti-transformatorovych-jimek-typ-bn-of\\\/\",\"url\":\"https:\\\/\\\/www.lichtgitter.cz\\\/en\\\/blog\\\/produkty\\\/transformer-pit-covers\\\/zakryti-transformatorovych-jimek-typ-bn-of\\\/\",\"name\":\"BP-H - 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for BP-H Type Transformer Pits For the covering of transformer pits, the BP-H sheet metal profile is advantageously used. 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