Hey there! If you’re working with loadbreak switches—whether you’re a line tech, a project manager, or someone who just needs to make sure your gear is up to code—you’ve probably wondered about grounding requirements. As a supplier that’s been in this game for almost 15 years, I’ve seen firsthand how skipping or messing up grounding on these switches can lead to way bigger problems than just a bad day. Let’s break this down like we talk to our customers on the phone—no stuffy industry jargon, just real stuff that matters. Loadbreak Switch
First off, let’s keep it simple: a loadbreak switch is that device you use to open and close a circuit under load (aka when power’s flowing, not just when it’s dead). Grounding is all about creating a safe path for electricity to escape if something goes wrong—like a fault in the switch, or a line that gets damaged. But it’s not just “attach a wire to the metal part.” There are specific rules that tie to voltage class, installation environment, and even how the switch is mounted. Let’s dive into the key stuff you need to know.
First, voltage class is non-negotiable. If you’re working with a low-voltage system (usually under 1kV) vs. medium-voltage (1kV to 69kV), the grounding requirements shift hard. For example, our low-voltage loadbreak switches—we call ‘em the LVS series for short—needs a solid grounding conductor that’s rated for at least the fault current for the time the switch is supposed to clear a fault. Wait, fault current? That’s the big surge of electricity when a circuit shorts out. If you use a too-thin ground wire, it’ll melt like a popsicle on a hot asphalt road. We always recommend following NEC (National Electrical Code) 250 for low-voltage, but for medium-voltage, it’s more about ANSI standards—like ANSI C37.32, which covers switchgear grounding. I’ve seen a customer skip that once because they thought “bigger wire is better” but they used a stranded copper wire that wasn’t tinned, and after a few fault events, the strands broke. Big mistake. Now we tell every medium-voltage customer to use solid, tinned copper ground conductors because they’re way better at resisting corrosion and breaking under tension.
Next, installation environment. If your switch is going in a substation, outdoor pole, or underground vault, the grounding needs change. Outdoor pole-mounted switches—super common for distribution lines—need a ground rod or a ground ring around the pole, right? But here’s a pro tip from our install team: don’t just drive one 8-foot ground rod and call it done. If you’re in rocky soil or high-resistance ground (like sandy areas), you might need two rods bonded together, spaced 6 feet apart. I had a customer out in Arizona last year who tried one rod, and during a storm, a line fault arced to the pole, and the ground rod’s resistance was too high—so the current bounced back, almost zapping a lineman. Now they use two rods, and we throw in a ground clamp that’s rated for outdoor use, not the cheapo ones you get at a hardware store. Indoor switches, like in a vault, still need grounding but it’s usually bonded to the building’s main ground bus instead of a separate rod. No more guessing—our sales team always asks where the switch is going before we ship, so we can suggest the right grounding parts.
Then there’s the switch’s own grounding provisions. Loadbreak switches aren’t just a box you bolt to a pole; they have specific points designed for grounding. Most of our switches have a dedicated grounding lug—look for that, not just any metal part. If you attach a ground wire to a paint-covered surface, the paint will insulate it, so the ground does nothing. I’ve had a customer who skipped sanding the lug before attaching the wire, and the ground connection was only 20% effective. Now we send a little sandpaper packet with every medium-voltage switch for exactly that reason. Also, some newer loadbreak switches have integrated grounding switches—we call them “E-ground” for our E-series. Those aren’t just extra; they’re a requirement in many codes now because they let you ground the circuit without messing with the main switch. If you’re working on a line, you flip the E-ground switch first, and that creates a safe path before you touch any parts. No more trying to ground with a separate wire, which is a fall hazard.
Wait, let’s talk about common mistakes we see all the time. One big one is forgetting to ground both the source and load sides? No, actually—for most loadbreak switches, you need to ground the frame of the switch, not the circuits. But I’ve seen some guys ground the live parts by accident, which is a disaster. Another mistake is using a ground wire that’s too short. If the wire is tight between the switch and ground rod, when the pole moves in wind, the wire gets stretched, and eventually breaks. We suggest leaving a foot or two of slack for outdoor installs. And don’t forget corrosion! If you’re in a coastal area with salt air, you need to use galvanized steel ground rods and corrosion-resistant clamps. We make our coastal-specific loadbreak switches with all-316 stainless steel grounding parts, and those customers never have issues with rust.
Also, code updates matter. A few years back, NEC changed some rules for medium-voltage distribution equipment—now, for switches over 5kV, the grounding conductor has to be able to handle 100% of the fault current for at least 3 cycles. That’s not a lot of time, but it’s enough to trip a breaker. A customer in Texas didn’t update their specs, and their old ground wire couldn’t handle it—they had a switch fail during a fault, which shut down a whole neighborhood for 6 hours. That’s why we keep our customers in the loop on code changes—we send a quarterly email with updates, and our tech support team will jump on a call for free if you have questions about your specific setup.
Let’s circle back to why all this matters for you. If your grounding is wrong, it’s not just a code violation—it’s a safety hazard. Linemen deal with enough risks every day, don’t make grounding one of ’em. And for your business, a bad ground can lead to equipment damage, downtime, or even insurance issues. We’ve had a few customers come to us after having a grounding-related failure, and they tell us they wish they’d asked us earlier. As a loadbreak switch supplier, we don’t just sell you a switch and walk away—we’re here to help with the grounding stuff too.
So, what should you do next? If you’re planning a new install, upgrading existing gear, or just want to make sure your current loadbreak switch meets all grounding requirements, reach out to our team. We can talk through your voltage class, installation location, and any code rules you need to follow. No sales pitch, just real advice from people who’ve installed these switches a thousand times. We’ll even send you a free grounding spec sheet tailored to your project.
Wait, let’s make sure I didn’t miss anything. Oh—testing! After you install the ground, test it. Use a ground resistance tester to make sure it’s under 25 ohms for most applications, but check your local code. That lineman in Arizona I mentioned earlier? He tested the first ground and it was 40 ohms, but he thought “close enough”—never again. Our team always reminds customers to test after installation, not just before.
At the end of the day, loadbreak switches are only as safe as their grounding. Don’t cut corners here. As someone who’s been supplying these for years, I’ve seen too many avoidable issues from bad grounding. Let’s get it right the first time.
If you’re ready to chat through your loadbreak switch needs and get all the grounding details sorted, feel free to connect with our procurement team. We’re here to make this process smooth, no stress.
MV Switchgear References:
- National Electrical Code (NEC) Article 250: Grounding and Bonding
- ANSI C37.32: American National Standard for Switchgear – High-Voltage Air Switches, Busbars, and Switch Accessories
- IEEE Std 141: IEEE Recommended Practice for Electric Power Distribution for Industrial Plants
Wenzhou Shuowei Electric Co., Ltd.
Wenzhou Shuowei Electric Co., Ltd. is one of the most professional loadbreak switch manufacturers and suppliers in China, specialized in providing high quality customized service. We warmly welcome you to wholesale bulk loadbreak switch in stock here from our factory. Contact us for quotation.
Address: No.208 Wei 12 Rd, Yueqing Economic Development Zone, Wenzhou, China
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