You can protect your home’s electrical system from many lightning-related power surges with a whole-home surge protector. These devices divert excess voltage away from wiring and into the ground. This reduces the risk of damage to electronics, appliances, and electrical system components. But whole-home surge protectors can’t protect against direct lightning strikes.
Quick Takeways
- Whole-home surge protectors defend against nearby lightning strikes
- No surge protector offers complete protection against direct lightning strikes.
- The most common power surges enter homes via utility lines.
- You’ll get the best defense by layering whole-home and point-of-use surge protection.
- Professional installation is key to getting effective surge protection.
How Does Lightning Damage Your Home’s Electrical System?
Direct lightning strikes can carry 30,000 amps of electrical current and 300 million volts. They can destroy your home’s electrical system and everything plugged in. Worse still, there aren’t any surge protection devices (SPDs) powerful enough to stop them.
Fortunately, direct lightning strikes aren’t very common. Most lightning-related power surges enter homes via utility lines. Whole-home surge protectors protect against these and other lightning-related power surges. They also provide daily internal surge protection.
Nearby Lightning Strikes
If lightning strikes near your home, the current will spread through the ground. When it reaches your electrical system’s grounding rod, it could burn your grounding system out and backflow into the building. This will leave your electrical system unprotected from future ground faults.
Depending on how much voltage backflows into your home, a nearby lightning strike could melt wiring insulation, destroy costly electronics and appliances, and start fires. Once inside, excess current simultaneously races down every connected wall circuit in search of a place to ground. This fries the delicate chips in computers, gaming consoles, and smart TVs, and chars electrical outlets and switches.
Indirect lightning strikes can even create large electromagnetic pulses (EMPs). EMPs induce voltage into nearby wires while targeting low-voltage lines. They can instantly fry Internet routers, smart thermostats, security cameras, and more.
Utility Line Surges
When lightning strikes utility lines, they act as long-distance funnels for electrical current. If lightning strikes a transformer or power line in your area, thousands of volts of electricity could come flowing into your home. These sudden, massive spikes in voltage can destroy electrical panels, blow out circuit breakers, and obliterate smart meters.
They can also cause the instant failure of major home appliances, including HVAC systems, EV charging stations, ovens, refrigerators, and more.
Voltage Spikes Traveling Through Your Electrical System
Voltage spikes don’t always have external sources. In most homes, smaller internal power surges occur several times a day. Internal surges can occur when air conditioners, refrigerators, or other heavy-motor appliances cycle off and on.
Overloaded circuits and faulty wiring can cause internal surges, too. These smaller surges account for more than 80% of voltage spikes in most homes, and you can protect against them with a whole-house SPD.
What Can a Whole-Home Surge Protector Protect?
Whole-home SPDs offer excellent protection against utility line surges. Acting as gatekeepers, whole-house SPDs direct excess voltage from utility lines into the ground before it enters branch circuits.
SPDs also provide reliable containment for recurring internal power surges. They catch internal spikes at bus bars and transfer them into the ground. This keeps excess voltage from bouncing to delicate branch circuits and harming outlets, appliances, and electronics.
SPDs can safeguard your:
- HVAC equipment
- Kitchen appliances
- Hardwired thermostats and security equipment
- Electronics
- Smart home devices
However, whole-home SPDs only offer partial protection against nearby lightning strikes. They can help with surges that backflow from grounding systems by intercepting them at main panels. But they cannot help when excess voltage enters via roofs or as a result of EMPs that affect in-wall wiring.
What Can’t a Surge Protector Do?
Whole-home surge protectors don’t protect against direct lightning strikes, but they can limit the damage caused by nearby strikes, utility line surges, and internal voltage spikes. Because electricians install whole-house SPDs directly on electrical panels, their protection largely depends on where excess voltage is coming from and where electrical current is flowing.
Massive power surges can overwhelm an SPD’s maximum surge current rating. This can occur during close lightning strikes and major utility surge events. For instance, if a direct lightning strike hits a utility line just outside your home, the resulting surge could exceed the physical capacity of your SPD’s internal components.
Why Grounding Matters
Properly grounding SPDs is important. Grounding provides an escape route for excess voltage. Without it, whole-house surge protectors have nowhere to divert excess electrical current.
Grounding is also key for outlet-specific surge protection, such as power strips and surge protector cords. Many homes built before the 1960s have two-pronged outlets rather than three-pronged outlets with grounding pins. Lacking grounding pins that connect to grounding wires, older outlets have no means for dumping excess electricity.
Multi-Layered Surge Protection Works Best
There are multiple levels of surge protection. Whole-house SPDs offer the best protection against both internal and external surge events, but outlet-specific protection helps, too. Pairing these with a lightning rod can limit damage from many nearby lightning strikes, but no system, not even a multi-layered one, offers 100% protection.
Is a Whole-Home Surge Protector Worth It in Florida?
With Florida’s frequent thunderstorms, high lightning activity, and ongoing power grid strain, high-voltage surge events are all too common. This makes whole-home surge protection well worth the investment. By protecting the lifespan of costly appliances and electronics, whole-house SPDs quickly pay for themselves while offering lasting value.
How to Improve Lightning Protection for Your Home
If you haven’t installed whole-house surge protection, now is the time to do so. Get further protection for costly, sensitive electronics by investing in plug-in surge protectors as well. For best results, have a licensed electrician ensure proper grounding and installation.
Ahead of major storms, you can also unplug your electronics when practical to do so. Unplugging high-value electronics will keep them safe in areas where SPDs fall short.
Frequently Asked Questions
Surge protection is a complex subject. At Tampa Mister Sparky, we’re sharing answers to some of the most frequently asked SPD questions.
Can a whole-home surge protector stop lightning damage?
Whole-home surge protectors don’t protect against direct lightning strikes. But they can minimize or prevent electrical damage from nearby strikes, utility line strikes, some EMPs, and internal power surges.
Do plug-in surge protectors protect against lightning?
Plug-in surge protectors offer limited protection against lightning. They can protect against distant, indirect lightning strikes and residual surges from power grids. They’re most effective in this capacity when paired with whole-house SPDs.
Can lightning damage appliances even without a direct hit?
Yes, it can. Indirect, nearby lightning strikes can flood homes with enough voltage to melt wiring insulation and start fires. Installing SPDs protects costly appliances and electronics and keeps buildings and families safe.
How long does a whole-home surge protector last?
Whole-home surge protectors typically last 5 to 10 years. But frequent, high-magnitude power surges can shorten their lifespan.
Protect Your Home From Power Surges
An unprotected power surge can cause significant electrical damage in an instant. These events also place homes and families at risk of fast-spreading fires.
Protect your home today by calling Tampa Mister Sparky for whole-home surge protection. Don’t put up with any Malarkey! Contact Tampa’s on-time electrician now!