{"id":17949,"date":"2026-10-09T09:00:00","date_gmt":"2026-10-09T07:00:00","guid":{"rendered":"https:\/\/tps-elektronik.com\/?p=17949"},"modified":"2026-09-16T03:24:10","modified_gmt":"2026-09-16T01:24:10","slug":"how-to-protect-outdoor-equipment-from-lightning-and-surge-damage-with-tps-iec-61643-certified-outdoor-server-rack-cabinet","status":"publish","type":"post","link":"https:\/\/tps-elektronik.com\/en\/how-to-protect-outdoor-equipment-from-lightning-and-surge-damage-with-tps-iec-61643-certified-outdoor-server-rack-cabinet\/","title":{"rendered":"How to Protect Outdoor Equipment from Lightning and Surge Damage with TPS IEC 61643 Certified Outdoor Server Rack Cabinet?"},"content":{"rendered":"<article class=\"product-blog\" lang=\"en\"><header>\n<p>For system integrators, panel builders, and procurement teams deploying equipment in outdoor environments, lightning and surge damage is not a theoretical risk\u2014it is a leading cause of equipment failure, data loss, and costly downtime. A single lightning strike near an outdoor cabinet can induce surge voltages of several thousand volts on power and signal lines, destroying sensitive electronics in milliseconds.<\/p>\n<p>The <strong>TPS IEC 61643 certified outdoor server rack cabinet<\/strong> engineered to protect outdoor equipment from exactly these threats. With integrated surge protective devices (SPDs) compliant with <strong>IEC 61643-11<\/strong>, a robust grounding system, IP-rated enclosure construction, and thermal management for outdoor operation, this cabinet delivers the comprehensive protection that outdoor telecom, edge computing, and industrial installations demand.<\/p>\n<p><a class=\"cta-primary\" href=\"https:\/\/www.shop-tps.com\/shop\/category\/mechanical-products-19-cabinets-160\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">Shop TPS Outdoor Server Rack Cabinets \u2192<\/a><\/p>\n<\/header><nav class=\"toc\" aria-label=\"Table of Contents\">\n<h2 id=\"toc-en\">Table of Contents<\/h2>\n<ol>\n<li><a href=\"#en-lightning-threat\">The Lightning and Surge Threat to Outdoor Equipment<\/a><\/li>\n<li><a href=\"#en-iec-61643\">IEC 61643: The International Standard for Surge Protection<\/a><\/li>\n<li><a href=\"#en-cabinet-design\">Cabinet Design for Surge and Lightning Protection<\/a><\/li>\n<li><a href=\"#en-grounding\">Grounding Systems: The Foundation of Surge Protection<\/a><\/li>\n<li><a href=\"#en-thermal-management\">Thermal Management for Outdoor Cabinets<\/a><\/li>\n<li><a href=\"#en-tps-cabinets\">TPS Outdoor Server Rack Cabinet Configurations<\/a><\/li>\n<li><a href=\"#en-applications\">Applications and Selection Guidance<\/a><\/li>\n<li><a href=\"#en-faq\">FAQ<\/a><\/li>\n<\/ol>\n<\/nav>\n<section id=\"en-lightning-threat\">\n<h2>1. The Lightning and Surge Threat to Outdoor Equipment<\/h2>\n<p>Outdoor equipment\u2014telecom base stations, edge computing nodes, traffic control systems, security cameras, and industrial control cabinets\u2014is exposed to two primary electrical threats: direct lightning strikes and indirect surge events.<\/p>\n<p><strong>Direct lightning strikes<\/strong> inject enormous currents\u2014typically 20kA to 200kA\u2014into the structure or nearby ground. Even if the strike does not directly hit the cabinet, the electromagnetic field generated by the strike induces surge voltages on power and signal cables. A strike 100 meters away can still induce thousands of volts on unshielded cables.<\/p>\n<p><strong>Indirect surge events<\/strong> include switching transients from the power grid, electrostatic discharge, and electromagnetic pulses from nearby equipment. These events are less dramatic than lightning but occur far more frequently, gradually degrading equipment and causing intermittent failures.<\/p>\n<p>For outdoor cabinets, the consequences of inadequate surge protection include:<\/p>\n<ul>\n<li><strong>Immediate equipment destruction:<\/strong> Power supplies, communication modules, and control boards can destroyed instantly<\/li>\n<li><strong>Latent damage:<\/strong> Components may survive a surge event but fail weeks or months later, leading to unpredictable field failures<\/li>\n<li><strong>Data loss and corruption:<\/strong> Surges can corrupt stored data and disrupt communication links<\/li>\n<li><strong>Safety hazards:<\/strong> Surge-induced arcing can create fire and shock hazards<\/li>\n<li><strong>Costly downtime:<\/strong> Replacing equipment and restoring service in remote outdoor locations is expensive<\/li>\n<\/ul>\n<p>TPS outdoor server rack cabinets address these threats through integrated surge protection, robust grounding, and environmental sealing\u2014delivering the protection that outdoor installations require.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-18094\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/09\/IEC-61643-Certified-Outdoor-Server-Rack-Cabinet-with-Surge-Protection-1.jpg\" alt=\"IEC 61643 Certified Outdoor Server Rack Cabinet with Surge Protection IEC-61643-zertifizierter Outdoor-Serverschrank mit \u00dcberspannungsschutz\" width=\"1920\" height=\"1079\" \/><\/p>\n<p><a class=\"cta-primary\" href=\"https:\/\/tps-elektronik.com\/en\/produkte\/19-inch-cabinets-chassis\/\">Learn more about TPS 19-inch cabinets \u2192<\/a><\/p>\n<\/section>\n<section id=\"en-iec-61643\">\n<h2>2. IEC 61643: The International Standard for Surge Protection<\/h2>\n<p>IEC 61643 is the international standard series for surge protective devices (SPDs) connected to low-voltage power distribution systems. It defines the performance requirements, testing methods, and classification of SPDs to ensure they provide reliable protection against surge events.<\/p>\n<p><strong>IEC 61643-11<\/strong> applies to SPDs connected to low-voltage power systems. It defines three types of SPDs based on their intended installation location and surge handling capability:<\/p>\n<ul>\n<li><strong>Type 1 SPD:<\/strong> Installed at the service entrance, designed to handle partial lightning currents (up to 25kA per pole for 10\/350 \u00b5s waveform). Used where direct lightning strikes are possible.<\/li>\n<li><strong>Type 2 SPD:<\/strong> Installed at distribution panels, designed to handle induced surges (up to 40kA for 8\/20 \u00b5s waveform). Used for general surge protection.<\/li>\n<li><strong>Type 3 SPD:<\/strong> Installed near sensitive equipment, designed to handle residual surges (up to 10kA for 8\/20 \u00b5s waveform). Used for final protection of sensitive electronics.<\/li>\n<\/ul>\n<p><strong>IEC 61643-12<\/strong> provides guidance on the selection and application of SPDs, including coordination between SPD types and protection of signal and communication lines.<\/p>\n<p><strong>IEC 61643-21<\/strong> applies to SPDs for telecommunications and signaling networks, covering the protection of data lines, telephone lines, and network connections.<\/p>\n<p>For outdoor server rack cabinets, compliance with IEC 61643 means that the integrated SPDs have been tested and certified to handle defined surge currents while maintaining safe voltage protection levels. The <strong>voltage protection level (Up)<\/strong>\u2014the maximum voltage that appears at the equipment terminals during a surge\u2014is a critical parameter. Lower Up values provide better protection for sensitive electronics.<\/p>\n<p>TPS outdoor cabinets integrate SPDs compliant with IEC 61643-11 for AC power lines and IEC 61643-21 for signal and data lines, providing comprehensive protection for all connected equipment.<\/p>\n<\/section>\n<section id=\"en-cabinet-design\">\n<h2>3. Cabinet Design for Surge and Lightning Protection<\/h2>\n<p>An outdoor cabinet that protects equipment from lightning and surge damage must designed as a complete protection system\u2014not just a box with an SPD inside. TPS outdoor server rack cabinets incorporate several design features that enhance surge protection.<\/p>\n<p><strong>Metallic Enclosure as a Faraday Cage:<\/strong> The all-metal construction of TPS outdoor cabinets provides inherent shielding against radiated electromagnetic fields. When properly grounded, the enclosure acts as a Faraday cage, attenuating electromagnetic fields induced by nearby lightning strikes. This reduces the surge energy that reaches internal equipment.<\/p>\n<p><strong>Integrated SPD Mounting:<\/strong> TPS outdoor cabinets provide dedicated DIN rail or panel mounting for Type 1 and Type 2 SPDs, with pre-wired connections to the AC input and grounding system. This simplifies installation and ensures proper coordination between SPDs.<\/p>\n<p><strong>Separated Cable Routing:<\/strong> Power cables and signal cables routed in separate compartments or cable ducts to prevent surge coupling between power and data lines. This separation is critical for maintaining signal integrity during surge events.<\/p>\n<p><strong>Cable Entry Protection:<\/strong> Cable entries are designed with proper sealing and strain relief, and where cables enter the cabinet, surge protection devices can mounted directly at the entry point to minimize the length of unprotected cable inside the enclosure.<\/p>\n<p><strong>IP-Rated Sealing:<\/strong> TPS outdoor cabinets rated IP55 or higher, protecting internal equipment from water, dust, and humidity. Sealed enclosures also prevent contamination that could compromise insulation and surge protection.<\/p>\n<p>For system integrators designing outdoor installations, these design features simplify the implementation of a complete surge protection system and reduce the risk of protection gaps.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-18089\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/09\/Outdoor-Cabinet-SPD-Integration-and-Cable-Routing-for-Surge-Protection-2.jpg\" alt=\"Outdoor Cabinet SPD Integration and Cable Routing for Surge Protection Integration von \u00dcberspannungsschutzger\u00e4ten (SPD) und Kabelf\u00fchrung f\u00fcr den \u00dcberspannungsschutz in Au\u00dfenschr\u00e4nken\" width=\"1920\" height=\"1079\" \/><\/p>\n<\/section>\n<section id=\"en-grounding\">\n<h2>4. Grounding Systems: The Foundation of Surge Protection<\/h2>\n<p>Surge protection is only as effective as the grounding system it relies on. When an SPD diverts surge energy to ground, that energy must have a low-impedance path to earth. A poor grounding system causes voltage to rise at the equipment, defeating the purpose of the SPD.<\/p>\n<p>TPS outdoor server rack cabinets designed with comprehensive grounding provisions:<\/p>\n<ul>\n<li><strong>Main grounding busbar:<\/strong> A copper or tinned copper busbar provides a low-impedance common connection point for all grounding conductors, including the enclosure, SPD ground, equipment grounds, and cable shields.<\/li>\n<li><strong>Multiple grounding points:<\/strong> Provisions for connecting the cabinet to the site grounding system at multiple points reduce impedance and improve surge current distribution.<\/li>\n<li><strong>Bonding of metallic parts:<\/strong> All metallic components\u2014doors, panels, mounting rails\u2014bonded to the main grounding busbar to ensure equipotential bonding and prevent spark gaps.<\/li>\n<li><strong>Shield termination:<\/strong> Cable shields and armor are terminated at the cabinet entry to the grounding busbar, preventing surge currents from flowing through the cabinet on cable shields.<\/li>\n<\/ul>\n<p>For outdoor installations, the grounding system must designed to achieve a low ground resistance\u2014typically less than 10 ohms, and preferably less than 5 ohms for high-lightning areas. TPS provides guidance on grounding system design and can supply cabinets with pre-installed grounding busbars and bonding provisions.<\/p>\n<p>Compliance with <strong>IEC 62305<\/strong> (lightning protection) and <strong>IEC 60364<\/strong> (electrical installations) requires that the grounding system be coordinated with the building or structure lightning protection system. TPS outdoor cabinets designed to integrate seamlessly with site grounding systems.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-18099\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/09\/RA1053-48U-Cabinet.png\" alt=\"outdoor server rack cabinet 48U Cabinet\" width=\"683\" height=\"1024\" \/><\/p>\n<\/section>\n<section id=\"en-thermal-management\">\n<h2>5. Thermal Management for Outdoor Cabinets<\/h2>\n<p>Outdoor cabinets must manage thermal loads without compromising sealing or surge protection. TPS outdoor server rack cabinets incorporate thermal management solutions designed for outdoor operation.<\/p>\n<p><strong>Options for outdoor thermal management include:<\/strong><\/p>\n<ul>\n<li><strong>Natural convection:<\/strong> For low-power installations, sealed cabinets with internal heat spreaders and external cooling fins provide passive thermal management without fans or openings.<\/li>\n<li><strong>Filtered fan cooling:<\/strong> For higher power, fan cooling with IP55-rated filters maintains sealing while providing forced airflow. Filters must be regularly maintained to prevent clogging.<\/li>\n<li><strong>Heat exchangers:<\/strong> Closed-loop air-to-air heat exchangers transfer heat from the sealed interior to the outside without allowing outside air to enter. Ideal for dusty or humid environments.<\/li>\n<li><strong>Air conditioning:<\/strong> For high-power installations or extreme ambient temperatures, cabinet air conditioners provide active cooling with precise temperature control.<\/li>\n<\/ul>\n<p>Thermal management components are mounted to maintain the cabinet&#8217;s IP rating and bonded to the grounding system to prevent surge coupling. TPS provides cabinets configured with the appropriate thermal solution for each application&#8217;s power dissipation and ambient conditions.<\/p>\n<p>For more on TPS cabinet thermal design, see the <a href=\"https:\/\/tps-elektronik.com\/en\/news-insights\/\">TPS News &amp; Insights<\/a> section.<\/p>\n<\/section>\n<section id=\"en-tps-cabinets\">\n<h2>6. TPS Outdoor Server Rack Cabinet Configurations<\/h2>\n<p>TPS outdoor server rack cabinets are available in multiple sizes to accommodate different equipment densities and deployment scenarios. All models share the core surge protection, grounding, and environmental sealing features described above.<\/p>\n<p><strong>Available configurations:<\/strong><\/p>\n<ul>\n<li><a href=\"https:\/\/www.shop-tps.com\/shop\/15u-cabinet-27941?category=160#attr=29,31,49\" target=\"_blank\" rel=\"noopener noreferrer nofollow\"><strong>15U Outdoor Cabinet:<\/strong><\/a> Compact cabinet for edge computing, small telecom nodes, and remote monitoring equipment. Ideal where space is limited and power dissipation is moderate.<\/li>\n<li><a href=\"https:\/\/www.shop-tps.com\/shop\/24u-cabinet-27943?category=160#attr=42,45,47\" target=\"_blank\" rel=\"noopener noreferrer nofollow\"><strong>24U Outdoor Cabinet:<\/strong><\/a> Mid-size cabinet for larger edge deployments, traffic control systems, and industrial control applications. Provides more rack space for servers, switches, and power equipment.<\/li>\n<li><a href=\"https:\/\/www.shop-tps.com\/shop\/42u-cabinet-27944?category=160#attr=51,53\" target=\"_blank\" rel=\"noopener noreferrer nofollow\"><strong>42U Outdoor Cabinet:<\/strong><\/a> Full-size cabinet for telecom base stations, data center edge nodes, and high-density equipment. Supports larger power systems and more equipment.<\/li>\n<\/ul>\n<p>All cabinets are designed for 19-inch rack mounting and include:<\/p>\n<ul>\n<li><strong>IP55 or higher sealing<\/strong> for outdoor protection<\/li>\n<li><strong>IEC 61643-11 compliant SPD mounting<\/strong> for AC power<\/li>\n<li><strong>IEC 61643-21 compliant SPD mounting<\/strong> for signal and data lines<\/li>\n<li><strong>Copper grounding busbar<\/strong> with multiple connection points<\/li>\n<li><strong>Thermal management options<\/strong> including fans, heat exchangers, and air conditioning<\/li>\n<li><strong>Locking doors<\/strong> for security and access control<\/li>\n<\/ul>\n<p>TPS outdoor cabinets are also available with custom configurations for specialized requirements, including:<\/p>\n<ul>\n<li><strong>Custom sizes<\/strong> to match specific equipment footprints<\/li>\n<li><strong>Integrated power distribution<\/strong> with PDU and UPS options<\/li>\n<li><strong>Redundant power feeds<\/strong> for critical installations<\/li>\n<li><strong>Battery backup<\/strong> for telecom and edge applications<\/li>\n<li><strong>Remote monitoring<\/strong> for temperature, humidity, door status, and SPD status<\/li>\n<\/ul>\n<p><a class=\"cta-primary\" href=\"https:\/\/www.shop-tps.com\/shop\/category\/mechanical-products-19-cabinets-160\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">Configure Your TPS Outdoor Cabinet \u2192<\/a><\/p>\n<\/section>\n<section id=\"en-applications\">\n<h2>7. Applications and Selection Guidance<\/h2>\n<p>TPS IEC 61643 certified outdoor server rack cabinets are designed for a wide range of outdoor installations where equipment protection is critical.<\/p>\n<p><strong>Typical applications:<\/strong><\/p>\n<ul>\n<li><strong>Telecom base stations:<\/strong> Protecting radio equipment, power systems, and transmission gear from lightning and surge events<\/li>\n<li><strong>Edge computing nodes:<\/strong> Housing servers, switches, and storage in outdoor locations close to end users<\/li>\n<li><strong>Traffic control systems:<\/strong> Protecting controllers, communication modules, and sensors at intersections and highways<\/li>\n<li><strong>Security and surveillance:<\/strong> Housing NVRs, switches, and power supplies for outdoor camera systems<\/li>\n<li><strong>Industrial control:<\/strong> Protecting PLCs, I\/O modules, and communication equipment in outdoor industrial environments<\/li>\n<li><strong>Renewable energy:<\/strong> Housing inverters, controllers, and monitoring equipment at solar and wind installations<\/li>\n<li><strong>Oil and gas:<\/strong> Protecting SCADA and communication equipment at remote wellheads and pipeline sites<\/li>\n<\/ul>\n<p><strong>Selection considerations:<\/strong><\/p>\n<p>When selecting an outdoor cabinet for surge-prone environments, consider:<\/p>\n<ul>\n<li><strong>Lightning exposure:<\/strong> High-lightning areas require Type 1 SPDs and enhanced grounding<\/li>\n<li><strong>Equipment power:<\/strong> Determines thermal management requirements and cabinet size<\/li>\n<li><strong>Environmental conditions:<\/strong> Ambient temperature, humidity, dust, and corrosive atmosphere affect material and sealing choices<\/li>\n<li><strong>Grounding system:<\/strong> Site grounding resistance and available grounding connections<\/li>\n<li><strong>Access requirements:<\/strong> Frequency of maintenance and need for remote monitoring<\/li>\n<\/ul>\n<p>TPS provides application engineering support to help system integrators select the right outdoor cabinet and surge protection configuration for their specific deployment. For assistance, see the <a href=\"https:\/\/www.shop-tps.com\/shop\/category\/mechanical-products-19-cabinets-160\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">TPS Outdoor Cabinet product page<\/a>.<\/p>\n<p><a class=\"cta-primary\" href=\"https:\/\/www.shop-tps.com\/shop\/category\/mechanical-products-19-cabinets-160\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">Shop TPS Outdoor Server Rack Cabinets \u2192<\/a><\/p>\n<\/section>\n<section id=\"en-faq\">\n<h2>8. FAQ<\/h2>\n<div>\n<div>\n<h3>What is IEC 61643 and why is it important for outdoor cabinets?<\/h3>\n<div>\n<div>IEC 61643 is the international standard for surge protective devices (SPDs). It defines performance requirements, testing methods, and classification for SPDs used in low-voltage power and signal systems. For outdoor cabinets, IEC 61643 compliance ensures that integrated SPDs provide tested, reliable protection against lightning and surge events.<\/div>\n<\/div>\n<\/div>\n<div>\n<h3>What type of SPD is required for outdoor cabinet protection?<\/h3>\n<div>\n<div>Outdoor cabinets typically require Type 1 SPDs at the AC power entry (to handle partial lightning currents) and Type 2 SPDs at distribution points. Signal and data lines require SPDs compliant with IEC 61643-21. TPS outdoor cabinets provide mounting for both types.<\/div>\n<\/div>\n<\/div>\n<div>\n<h3>How important is grounding for surge protection in outdoor cabinets?<\/h3>\n<div>\n<div>Grounding is critical. Surge protection diverts surge energy to ground, and that energy needs a low-impedance path to earth. A poor grounding system causes voltage to rise at the equipment, defeating the SPD. TPS outdoor cabinets include a copper grounding busbar and multiple bonding points for effective grounding.<\/div>\n<\/div>\n<\/div>\n<div>\n<h3>What IP rating is required for outdoor server rack cabinets?<\/h3>\n<div>\n<div>Outdoor cabinets typically require IP55 or higher to protect against water and dust ingress. TPS outdoor cabinets are rated IP55 or better, ensuring reliable operation in rain, snow, and dusty environments.<\/div>\n<\/div>\n<\/div>\n<div>\n<h3>How does TPS handle thermal management in sealed outdoor cabinets?<\/h3>\n<div>\n<div>TPS offers multiple thermal management options: natural convection for low power, filtered fan cooling with IP55 filters, closed-loop heat exchangers for dusty or humid environments, and air conditioning for high-power or extreme-temperature installations.<\/div>\n<\/div>\n<\/div>\n<div>\n<h3>Can TPS provide custom outdoor cabinet configurations?<\/h3>\n<div>\n<div>Yes. TPS outdoor cabinets can be customized with special sizes, integrated power distribution, redundant power feeds, battery backup, and remote monitoring. Contact TPS for application engineering support.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<footer style=\"background: #2d5797; padding: 30px; border-radius: 14px; margin-top: 40px;\">\n<p style=\"color: #ffffff; font-size: 16px; line-height: 1.6; margin: 0;\"><strong>Ready to protect your outdoor equipment from lightning and surge damage?<\/strong><br \/>Contact TPS Elektronik for engineering consultation, outdoor cabinet selection, and custom configuration\u2014from IEC 61643 certified surge protection to integrated thermal management.<br \/><a style=\"color: #ffffff; font-weight: 600; text-decoration: underline;\" href=\"https:\/\/www.shop-tps.com\/shop\/category\/mechanical-products-19-cabinets-160\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">Shop TPS Outdoor Server Rack Cabinets \u2192<\/a><\/p>\n<\/footer><\/article>\n\n<style 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A single lightning strike near an outdoor cabinet can induce surge voltages of several thousand volts on power and signal lines,\u2026 <a href=\"https:\/\/tps-elektronik.com\/en\/how-to-protect-outdoor-equipment-from-lightning-and-surge-damage-with-tps-iec-61643-certified-outdoor-server-rack-cabinet\/\">Read More &raquo;<\/a><\/p>\n","protected":false},"author":9,"featured_media":18099,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[53],"tags":[],"class_list":["post-17949","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-production"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>TPS Outdoor Server Rack Cabinet - TPS<\/title>\n<meta name=\"description\" content=\"Outdoor server rack cabinet with IEC 61643 surge protection, IP55 sealing, and grounding system for lightning protection.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/tps-elektronik.com\/en\/how-to-protect-outdoor-equipment-from-lightning-and-surge-damage-with-tps-iec-61643-certified-outdoor-server-rack-cabinet\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"TPS Outdoor Server Rack Cabinet - 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