An electrician installs a whole-home surge protector by shutting off the power, mounting the unit in your main electrical panel, wiring it to a double-pole breaker, and connecting it to the panel’s grounding wire. The job typically takes a few hours and protects the circuits throughout your home.
A major power surge can damage your air conditioner, refrigerator, water heater, range, and other devices. When more power flows through your electrical system than it can handle, the extra electricity can burn out appliance motors and circuit boards. A whole-home surge protector stops that from happening.
Key Points
- A whole-home surge protector (type 2) mounts in your main electrical panel.
- Installation takes a few hours and requires a licensed electrician.
- The unit sends surge current to your home’s grounding system, away from your appliances.
- Lightning and grid problems cause external surges; overloaded circuits and appliances cause internal ones.
- Pair a whole-home unit with plug-in surge strips for layered protection.
What Are the Types of Surge Protectors?
The three main types of surge protectors for your home are type 1, type 2, and type 3. A type 2 whole-home surge protector is often the best choice because it installs directly in your main electrical panel and defends against both internal and external bursts of power.
| Type | Where it’s installed | What it protects against |
| Type 1 | Outside your home | External surges, but not smaller bursts of power that reach your belongings |
| Type 2 (whole-home) | Main electrical panel | External surges and the fire hazards they create |
| Type 3 | At the outlet, such as surge strips for a TV or computer | Internal surges to smaller devices, but not external surges |
When more current flows through a circuit than it can handle, the wires heat instantly. That heat can melt insulation, make wires spark, and start a fire. A type 2 whole-home surge protector is the most effective way to defend your appliances and electrical system from external surges.
Recent editions of the National Electrical Code require surge protection when a home’s electrical service is installed or replaced. The Electrical Safety Foundation International explains these NEC surge protection requirements in plain terms.
How Does an Electrician Install a Whole-Home Surge Protector?
A licensed electrician installs a whole-home surge protector in a few hours. Doing it yourself risks electrocution, damage to your electrical system, and a serious fire hazard. Crowe Electric’s electricians work under a certified Master Electrician (License #22896-A) and complete each installation safely and to code. The process follows four steps:
- Shut off the power. The electrician turns off the power before opening your electrical panel.
- Mount the unit. The surge protector can go anywhere between the main electrical panel and the electric meter, but the main breaker panel is the best location when it has room.
- Wire it to a double-pole breaker. The surge protector connects to a double-pole breaker in the panel.
- Connect the grounding wire. The electrician connects the surge protector to the panel’s grounding wire, which lets it direct surges away from your appliances and circuits.
What If Your Panel Has No Room?
Sometimes the main panel has no open space for the surge protector. The electrician may replace some existing breakers with double breakers to free up room. If that doesn’t work, the panel may need electrical panel replacement with a larger one. Another option is a surge protector that hard-wires directly into the panel instead of connecting to a double breaker.
Why Not Install It in a Sub-Panel?
Some homeowners try to avoid a panel replacement by installing the surge protector in a nearby sub-panel. We never recommend this. A surge protector in a sub-panel protects only the circuits on that sub-panel, leaving the circuits in your main breaker panel with little to no protection.
How Does a Whole-Home Surge Protector Work?
A whole-home surge protector constantly monitors the voltage flowing through your main electrical panel. When it detects a sudden voltage spike, it isolates the panel so the high-voltage current can’t flow through your circuits and into your appliances.
The surge protector then sends the current to the primary grounding wire. The current travels away from the panel, through the grounding wire, and into the copper ground rod outside your house, where it disperses into the soil.
Type 3 surge strips work the same way on a smaller scale. When a surge strip detects excess current, it channels the electricity to the grounding wire of the outlet it’s plugged into.
What Causes External vs. Internal Power Surges?
Internal Power Surges
Internal power surges usually come from an overloaded circuit. An overload happens when you plug in too many things at once or draw more power than the circuit can handle. Faulty appliances and electrical shorts can also cause internal surges.
Too much energy on a circuit can damage any device on it, such as your TV, microwave, or computer. Appliances that draw a lot of power when they turn on, like your air conditioner, vacuum, or hair dryer, can also trigger an internal surge.
Your home’s electrical system is designed to guard against internal surges. When excess power flows through a circuit, it trips the circuit breaker, which instantly cuts the flow of electricity to prevent overheating or appliance damage.
Your electrical panel itself can also get overloaded when the combined power draw of all your circuits exceeds its capacity. When that happens, the main circuit breaker trips and shuts off power to your home.
External Power Surges
Lightning strikes are the most common cause of external power surges. When lightning strikes any home in the area, it can send a tremendous swell of electricity to every building downstream. Problems with the local electrical grid can also cause external surges.
Your main breaker should trip during an external surge, but surges travel too fast for the breaker to react in time. The high voltage surges through your electrical system in less than the blink of an eye and can burn out the circuit boards on any appliance.
No surge protector can stop a direct lightning strike to your house. A whole-home surge protector handles the far more common surges from nearby strikes and grid problems.
How Do You Keep Your Home Protected Over Time?
Check the Indicator Lights
A whole-home surge protector wears down a little with every surge it absorbs. Most units have indicator lights that show whether protection is still active, so check them after a major storm. If the light shows a problem, call an electrician to replace the unit. You can also ask us to check it during an electrical safety inspection.
Do You Still Need Plug-In Surge Strips?
Yes. A whole-home surge protector stops large surges entering your electrical service, while plug-in type 3 surge strips protect sensitive electronics from smaller internal surges. Using both gives you layered protection.
Schedule Your Whole-Home Surge Protector Installation
If you want to learn more about whole-home surge protection, the team at Crowe Electric will answer your questions. Our Master Electrician and the rest of our team have years of experience installing whole-home surge protectors, and we back up all work we perform with a full five-year warranty. Ask about our current special on whole-home surge protection.
To protect your appliances before the next storm, book a consultation or call us today.
Author Bio:
Andrew Crowe
Owner of Crowe Electric, 331 Forest St, Rockland, MA holds a Electrician license and 1 other license according to the Massachusetts license board. Their BuildZoom score of 104 ranks in the top 9% of 139,240 Massachusetts licensed contractors.