Surge protectors can fail during a lightning strike because they have a limited capacity to absorb extreme electrical energy.

A direct or nearby lightning strike can overwhelm a surge protector, causing it to burn out or even catch fire.

TL;DR:

• Surge protectors sacrifice themselves to protect electronics from power surges.
• Lightning strikes generate far more energy than most surge protectors can handle.
• When overwhelmed, a surge protector can fail catastrophically, causing further damage.
• Even if it “works,” a damaged surge protector may no longer offer protection.
• Professional inspection is vital after a lightning event to assess all damage.

How Do Surge Protectors Fail During a Lightning Strike?

Lightning is an incredibly powerful force of nature. When it strikes near your home, it can send massive amounts of electricity surging through your electrical system. While surge protectors are designed to divert this excess energy, they have their limits. Sometimes, the sheer power of a lightning strike is simply too much for them to handle, leading to their failure.

The Role of Surge Protectors

Think of a surge protector as a gatekeeper for your electronics. Its main job is to watch for sudden spikes in voltage. When it detects a surge, it diverts that extra electricity away from your sensitive devices. This usually happens through a component called a Metal Oxide Varistor (MOV). MOVs are designed to absorb excess voltage and send it to the ground wire. This action protects your appliances from damage.

Why Lightning Overwhelms Surge Protectors

Lightning strikes are not just “spikes”; they are colossal bursts of energy. We found that a lightning bolt can carry over 100 million joules of energy. Most standard surge protectors are rated to handle surges of a few hundred to a couple of thousand joules. When a lightning strike occurs, the energy level can be thousands, even millions, of times higher than what the surge protector is designed for. It’s like trying to stop a tsunami with a garden hose.

The Breaking Point of MOVs

The MOVs inside a surge protector have a finite lifespan. Each time they divert a surge, they degrade slightly. A small surge might cause minimal wear. A large surge, like one from a nearby lightning strike, can cause the MOV to fail instantly. It might burn out, melt, or even explode. This failure means the surge protector can no longer do its job. It also means the surge can now pass through to your connected devices.

Catastrophic Failure Modes

When a surge protector fails due to a lightning strike, it doesn’t always just stop working. Sometimes, the failure is quite dramatic. We’ve seen cases where the internal components overheat rapidly. This can lead to smoke, sparks, or even a fire. The plastic casing can melt, and the device can become a fire hazard. This is why it’s essential to understand the risks involved and to act before it gets worse.

What Happens to Your Electronics?

If the surge protector fails, the full force of the electrical surge can travel to the devices plugged into it. This can fry circuit boards, damage power supplies, and render electronics useless. Sometimes, the damage isn’t immediate. Devices might seem to work, but internal components could be weakened, leading to failure days or weeks later. This is a common concern for homeowners after a severe storm.

The Aftermath: When is Protection Gone?

A common misconception is that if a surge protector still has lights on, it’s still protecting your devices. This is not true. Many surge protectors have an indicator light that shows they are receiving power. However, the internal components that provide surge protection might have already been destroyed by a previous surge. If a lightning strike has occurred, even if the surge protector appears functional, it’s wise to assume it’s no longer providing protection. You might need to consider scheduling a free inspection to be certain.

Visible Signs of Failure

Sometimes, the failure of a surge protector is obvious. You might see scorch marks, melted plastic, or smell a burning odor. Other times, the failure is internal and not visible. The only sign might be that the devices plugged into it have stopped working. Regardless of visible damage, if a significant electrical event like a lightning strike has occurred, it’s best to replace the surge protector. We found that it’s better to be safe than sorry.

What About Indirect Strikes?

You don’t need a direct lightning strike to your home for surge protectors to be overwhelmed. A strike to a nearby utility pole, a tree in your yard, or even the ground nearby can induce massive surges into your home’s wiring. These induced surges can travel through your electrical system just as easily. This can still be enough to cause storm related exterior damage and overwhelm your surge protectors. Understanding how does lightning damage a home it doesn’t directly strike is key to prevention.

The Importance of a Whole-House Surge Protector

For the best protection against lightning-induced surges, many experts recommend a whole-house surge protector. This device is installed at your main electrical panel. It provides a first line of defense for your entire home’s electrical system. It can help absorb the brunt of a surge before it even enters your home, offering better protection than point-of-use surge protectors alone. This is a smart investment for any homeowner concerned about lightning.

When to Seek Professional Help

After a lightning event, especially if you suspect damage, it’s crucial to get professional help. Electrical systems can be complex and dangerous. A qualified electrician can assess your surge protectors and your entire electrical system for damage. They can identify issues you might not see. This is especially important if you notice any flickering lights, odd smells, or malfunctioning appliances. Addressing these issues promptly can prevent further damage or hazards, such as potential fire risks. You should call a professional right away if you suspect any electrical problems.

Documenting Damage for Insurance

If your surge protectors or electronics have been damaged, you might have insurance questions after damage. It’s important to document everything thoroughly for your insurance claim. Take photos of the damaged surge protectors and any affected electronics. Keep a detailed list of all items that were damaged or destroyed. This documentation will be essential when you are documenting damage for a claim. Understanding does homeowners insurance cover lightning damage is a good first step.

Hidden Dangers After a Strike

Beyond damaged electronics, lightning can cause other unseen problems. It can damage wiring within your walls, potentially creating fire hazards. It can also affect plumbing and gas lines. In some cases, lightning strikes can lead to roof leaks after severe weather if they damage the structure. It’s why a thorough inspection by professionals is always recommended after a significant storm event.

The Risk of Fire

A significant concern after a lightning strike is the risk of fire. Damaged wiring or faulty surge protectors can overheat, leading to ignition. This is why understanding how long after a lightning strike do fire risks exist is important. Even if there isn’t an immediate fire, damaged electrical components can smolder for hours. This is why smoke residue after a fire can sometimes be a sign of an electrical issue. You should always be aware of potential fire damage cleanup concerns.

What About Other Appliances?

It’s not just your TV or computer that’s at risk. A powerful surge can damage refrigerators, washing machines, HVAC systems, and even the electrical components in your car if it’s plugged in. While surge protectors are great for smaller electronics, larger appliances often require direct hardwiring or specialized protection. It’s important to remember that how does a lightning strike damage electrical systems affects everything connected.

Conclusion

Surge protectors are a vital part of protecting your electronics, but they are not invincible, especially against the immense power of a lightning strike. When lightning strikes, it can generate energy far beyond a surge protector’s capacity, leading to its failure. This failure can range from simple burnout to dangerous situations like fires. Even if a surge protector appears to still work, it may no longer offer protection after such an event. It’s wise to be vigilant, replace suspect surge protectors, and consider professional assessments of your home’s electrical system after a lightning event. If you’re in the Des Moines area and have experienced lightning damage, Des Moines Damage Mitigation Pros is a trusted resource for assessing and restoring your property.

What is the main component in a surge protector that fails?

The main component in most surge protectors that fails is the Metal Oxide Varistor (MOV). MOVs absorb excess voltage, but they degrade with each surge and can be destroyed by a powerful surge like a lightning strike.

Can a surge protector catch fire during a lightning strike?

Yes, a surge protector can catch fire during or after a lightning strike. The extreme energy can cause the internal components to overheat and ignite the plastic casing, creating a serious fire hazard.

How can I tell if my surge protector has failed?

Some surge protectors have an indicator light that shows they are still receiving power, but this doesn’t mean they are still protecting your devices. Look for visible signs like scorch marks, melted plastic, or a burning smell. If you suspect a lightning strike, it’s best to replace the surge protector even if it looks fine.

Should I replace all my surge protectors after a lightning storm?

If there was a very close or direct lightning strike, it’s a good idea to replace all surge protectors that were in use or plugged in at the time. Even if they show no visible damage, their protective components may have degraded or been destroyed.

What is the difference between a surge protector and a lightning arrestor?

A surge protector is typically a plug-in device designed for electronics. A lightning arrestor is a more robust device, often installed at the main electrical panel (whole-house surge protector), designed to handle much larger surges and protect the entire home’s electrical system from events like lightning strikes.

John Tomko

John Tomko is a highly respected, licensed damage restoration expert with over 20 years of hands-on experience in property recovery. Known for his technical precision and authoritative industry knowledge, John specializes in helping homeowners and businesses navigate the complexities of catastrophic loss. He holds an extensive portfolio of advanced credentials, ensuring every project meets the highest standards of safety and excellence.

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John is an IICRC-certified specialist in Water Damage Restoration, Applied Microbial Remediation (Mold), Applied Structural Drying, Odor Control, and Fire and Smoke Restoration.

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John finds his greatest fulfillment in restoring peace of mind. He prides himself on being a steady, empathetic guide for clients during their most stressful moments of property recovery.

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When he isn’t on-site, John enjoys restoring vintage furniture and spending time outdoors with his family.

About the Author

Des Moines Damage Mitigation Pros Team

Licensed Damage Restoration Expert