{"id":3551,"date":"2026-10-09T12:29:59","date_gmt":"2026-10-09T04:29:59","guid":{"rendered":"http:\/\/www.girlwithacurlingiron.com\/blog\/?p=3551"},"modified":"2026-10-09T12:29:59","modified_gmt":"2026-10-09T04:29:59","slug":"can-an-outdoor-rmu-resist-strong-winds-419a-778908","status":"publish","type":"post","link":"http:\/\/www.girlwithacurlingiron.com\/blog\/2026\/10\/09\/can-an-outdoor-rmu-resist-strong-winds-419a-778908\/","title":{"rendered":"Can an Outdoor RMU resist strong winds?"},"content":{"rendered":"

Hey there, Outdoor RMU<\/a><\/p>\n

<\/p>\n

If you\u2019ve ever stood outside during a really gnarly windstorm\u2014like that one a couple years back that knocked out power for three days in our region\u2014you\u2019ve probably glanced at the big, metal box sitting on a utility pole or pad-mounted on the side of the road and thought, \u201cIs that thing gonna hold up?\u201d As someone who\u2019s been selling outdoor RMUs for over 8 years now, that question is way more common than you\u2019d think, and it\u2019s one I get at least once a week from electric co-ops, industrial facilities, and solar farm developers. Today, let\u2019s cut through the vague specs and jargon, and actually answer: Can an outdoor RMU really resist strong winds? Spoiler alert\u2014no, not every RMU out there can. But the right one? It\u2019s built to handle way more than just a little breeze.<\/p>\n

First, let\u2019s start with what an outdoor RMU even is, for anyone who\u2019s not deep in the utility gear weeds. RMU stands for Ring Main Unit\u2014think of it as a compact, self-contained electrical switchgear box that lives outdoors, no fancy building or climate-controlled room required. It\u2019s what helps route power, protect circuits, and isolate problems before they turn into full-blown outages. We install them everywhere: city streets, rural substations, wind farms, even on offshore wind project access roads. And when those areas get hit with 70, 80, even 100+ mph winds? The RMU\u2019s got to stick around.<\/p>\n

Let\u2019s talk about the basics of wind resistance, because it\u2019s not just about the box being heavy. Wind affects outdoor gear two main ways: uplift and side loading. Uplift is when wind grabs the underside of something and tries to lift it off the ground (or off the pole, if it\u2019s pole-mounted). Side loading is when wind pushes against the flat sides of the unit, like how a sail catches wind. Most cheap RMUs you\u2019ll find online are light, thin-walled, and made for mild climates. Those? They fold like a soda can in 60+ mph winds. The RMUs we sell? We build \u2019em to account for both uplift and side load, and we don\u2019t just pull numbers out of thin air\u2014we test every single unit (or at least every production batch) to real-world wind speeds, not just the arbitrary \u201ctest speeds\u201d some brands slap on their spec sheets.<\/p>\n

Wait, let\u2019s get into that testing part, because that\u2019s where a lot of suppliers cut corners. There\u2019s a standard we follow, actually\u2014it\u2019s IEC 62271-200, for anyone who cares about the official stuff. But we don\u2019t just stop at that minimum. Let\u2019s say a utility is in a part of the country that sees Category 2 hurricanes, which can hit 96 to 110 mph sustained winds. The minimum spec might be 120 mph for 10 minutes, but we test our RMUs to 135 mph sustained for 24 hours straight. Why? Because a test of 10 minutes is easy to pass, but a real storm doesn\u2019t die down after 10 minutes. It howls for hours. That\u2019s the difference between a unit that passes a lab test and one that works when it matters.<\/p>\n

Now, what makes our RMU wind-resistant? Let\u2019s break down the build, no corporate fluff. First, the enclosure. We don\u2019t use thin, cold-rolled steel that bends if you poke it with a screwdriver. Our enclosure is 3mm thick hot-dip galvanized steel\u2014 that\u2019s almost twice as thick as the cheap stuff. Galvanized is key too, not just for rust (though that\u2019s a bonus) but because it\u2019s way stronger than plain steel. Then there\u2019s the mounting, which is huge. Pole-mounted RMUs get clamped down with heavy-duty, stainless steel brackets that are torqued to exact specs\u2014no wimpy plastic clips here. Pad-mounted ones? We pour reinforced concrete footings that are twice the size of the industry minimum, and we run steel anchor bolts 3 feet deep into the ground, not just sticking 6 inches in like some competitors do. I\u2019ve seen a competitor\u2019s RMU get blown over in a 85 mph wind because their anchor bolts were only 8 inches long. That\u2019s not a test failure\u2014that\u2019s a lazy installation setup on their end.<\/p>\n

Then there\u2019s the internal components, which people forget matter for wind resistance too. If the internal switches, bus bars, or fuses aren\u2019t secured tight, wind vibration will shake them loose over time. We weld every internal part mount, not just bolt them on with tiny bolts that can vibrate loose. And we balance the weight of the RMU so it\u2019s not top-heavy. A lot of brands stuff extra components on the top to save space below, making the unit tip easier. Our RMUs have a center of gravity 2 feet lower than the industry average, so even if wind hits them at a bad angle, they stay stable.<\/p>\n

Now, let\u2019s talk about real-world examples, not just test numbers. Last year, we had a client in western Florida\u2014they installed 12 of our pad-mounted RMUs right before Hurricane Ian hit. That storm was clocked at 150 mph sustained, with gusts over 170. When the storm passed, they went out to check, and every single RMU was still standing, no damage. A neighboring solar farm had 8 different brand RMUs\u2014three of them were blown over, two had their enclosures bent so bad they couldn\u2019t open the doors, and the rest had loose internal parts. We got a call from that solar farm\u2019s manager the next day asking if they could swap out their bad ones for ours. That\u2019s the kind of proof that doesn\u2019t lie.<\/p>\n

Wait, but let\u2019s be real\u2014no RMU is invincible. If you stick a lightweight, cheap RMU on a rickety wooden pole in a tornado? Yeah, it might not make it. But that\u2019s not the RMU\u2019s fault\u2014that\u2019s a bad installation and wrong product choice. Here\u2019s the thing we tell every client: wind resistance isn\u2019t a one-size-fits-all thing. If you\u2019re in a mild climate where winds top out at 50 mph? Our base model works, and we sell that at a lower price. If you\u2019re in a hurricane zone, or mountainous area where wind can hit 100 mph regularly? We have heavy-duty, wind-rated RMUs designed specifically for those conditions. We don\u2019t push a single product on everyone because we know that\u2019s not how this works. A good RMU supplier listens to your location, your typical weather, and your needs, then recommends the right unit\u2014not the most expensive one.<\/p>\n

A common mistake we see clients make is only looking at IP ratings (that\u2019s the ingress protection, how dust\/water tight the unit is) and ignoring wind specs. IP67 is great for rain, but if wind blows the unit over, the IP rating doesn\u2019t matter anymore. I\u2019ve had clients say, \u201cBut this RMU has IP67, it\u2019s perfect!\u201d Then I ask, \u201cWhat\u2019s its wind rating?\u201d And they have no clue. That\u2019s a huge mistake. Wind is a structural load, not just an environmental factor. So always ask your supplier for the wind speed rating\u2014sustained, not just gusts\u2014and how they tested it. Any reputable RMU maker will have that number on their spec sheet, and if they don\u2019t? Run, don\u2019t walk, away from them.<\/p>\n

Another thing: wind resistance isn\u2019t just about the unit itself, it\u2019s about installation. We offer free site assessments for clients in high-wind areas. We\u2019ll come out, check the soil type (sandy soil needs bigger footings than clay), the pole strength (wood poles aren\u2019t as strong as steel, so we recommend extra brackets if you\u2019re using wood), and even the surrounding obstacles that might change wind flow (like nearby trees or buildings that can create wind tunnels). We don\u2019t just ship the RMU and say \u201cgood luck.\u201d We\u2019re there to make sure it\u2019s installed right, because a poorly installed top-tier RMU will fail in wind, and a well-installed basic RMU might hold up.<\/p>\n

Let\u2019s also touch on maintenance, because wind resistance isn\u2019t a set-it-and-forget-it thing. A lot of people think once the RMU is up, you never touch it. But we tell our clients to do a visual check once a year, especially before wind season. Look for loose brackets, rust on the anchors, or any dents in the enclosure that might weaken it. I had a client in Wyoming skip a check for two years, and a windstorm came and blew their RMU over\u2014turns out a bracket had rusted through from road salt. That\u2019s preventable. We even send our clients a free maintenance checklist with every RMU we sell, so they don\u2019t have to guess what to look for.<\/p>\n

Now, let\u2019s address the elephant in the room: cost. A lot of people say, \u201cWhy pay more for a wind-rated RMU when the cheap one is half the price?\u201d Let\u2019s do the math. If a cheap RMU costs $2,000, and it blows over in a storm, that\u2019s not just the cost of the RMU\u2014its replacement, the downtime (which for a solar farm can be $10,000 a day), the labor to install it, and the fines if a client loses power. That\u2019s way more than the extra $1,500 you\u2019d pay for a wind-rated RMU. We\u2019ve had clients who switched to our RMUs save over $50,000 in one storm, because they didn\u2019t have to repair or replace gear. It\u2019s an investment, not an expense.<\/p>\n

At the end of the day, the answer to \u201cCan an outdoor RMU resist strong winds?\u201d is: Yes\u2014if you pick the right one, install it correctly, and maintain it. It\u2019s not magic, it\u2019s engineering and attention to detail. We\u2019ve built our business on that, because I\u2019ve seen what happens when power goes out during a storm. Homes get cold, businesses lose money, hospitals can\u2019t run life-saving equipment. Our RMUs are designed to reduce that risk.<\/p>\n

<\/p>\n

If you\u2019re a utility manager, solar developer, or industrial operator looking for an RMU that can stand up to whatever wind your area throws at it, we\u2019re here to help. Shoot us a note, tell us where you\u2019re located, what kind of setup you need, and we\u2019ll hook you up with the right unit, no pressure, no pushy sales talk. We\u2019ll even send you a free wind test report for our units, so you can see exactly what they\u2019re built to handle. At the end of the day, we don\u2019t just sell gear\u2014we help keep power on when the wind\u2019s howling.<\/p>\n

\n

Gas Insulated Switchgear<\/a> References
\nIEC 62271-200: High-voltage switchgear and controlgear – Part 200: AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV
\nNational Electrical Safety Code (NESC) 2023: Requirements for the installation and maintenance of electrical equipment<\/p>\n

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Deepwill International Technology Development (Jiangsu) Co., Ltd.<\/a>
Deepwill International Technology Development (Jiangsu) Co., Ltd. is one of the most professional outdoor rmu manufacturers and suppliers in China, featured by quality products and good price. Please rest assured to buy outdoor rmu for sale here from our factory. Contact us for OEM service.
Address: No. 3-3 muyang Road, Hanjiang Economic Development Zone, Yangzhou city, Jiangsu Province, China.
E-mail: deepwill@deep-will.com
WebSite: https:\/\/www.deyunelectric.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Hey there, Outdoor RMU If you\u2019ve ever stood outside during a really gnarly windstorm\u2014like that one … Can an Outdoor RMU resist strong winds?<\/span>Read more<\/a><\/p>\n","protected":false},"author":155,"featured_media":3551,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3514],"class_list":["post-3551","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-outdoor-rmu-4a38-77d5df"],"_links":{"self":[{"href":"http:\/\/www.girlwithacurlingiron.com\/blog\/wp-json\/wp\/v2\/posts\/3551","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.girlwithacurlingiron.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.girlwithacurlingiron.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.girlwithacurlingiron.com\/blog\/wp-json\/wp\/v2\/users\/155"}],"replies":[{"embeddable":true,"href":"http:\/\/www.girlwithacurlingiron.com\/blog\/wp-json\/wp\/v2\/comments?post=3551"}],"version-history":[{"count":0,"href":"http:\/\/www.girlwithacurlingiron.com\/blog\/wp-json\/wp\/v2\/posts\/3551\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.girlwithacurlingiron.com\/blog\/wp-json\/wp\/v2\/posts\/3551"}],"wp:attachment":[{"href":"http:\/\/www.girlwithacurlingiron.com\/blog\/wp-json\/wp\/v2\/media?parent=3551"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.girlwithacurlingiron.com\/blog\/wp-json\/wp\/v2\/categories?post=3551"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.girlwithacurlingiron.com\/blog\/wp-json\/wp\/v2\/tags?post=3551"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}