Whole-House Surge Protection: What It Covers and What It Does Not

Storm damage to electronics rarely happens while the power is out. It happens in the second the power comes back. Ready.gov puts it plainly in its guidance on power outages: power may return with momentary surges or spikes that can cause damage, which is why it advises turning off or disconnecting appliances, equipment and electronics during an outage.

That advice works, and it depends on somebody being home to follow it. Panel-level surge protection is the version that does not. Here is what it addresses, what it leaves alone, and the questions worth asking before anyone installs one.

Most surges do not come from the sky

The mental image is a lightning strike. The arithmetic says otherwise. The Electrical Safety Foundation International, citing the National Electrical Manufacturers Association in its guide to outlet types, notes that 60 to 80 percent of surges are created within the building, such as when large appliances like air conditioners turn on and off.

That reframes the problem. A house with a heat pump, a well pump, a compressor and a dryer generates its own small events all year. External events from utility switching or weather sit on top of that. Protection that only makes sense during storm season is protection sized for the smaller half of the problem.

The two layers, and why one does not replace the other

Surge protection is normally discussed as layers rather than as a single product.

• At the service panel. A surge protective device installed at the panel is intended to reduce what gets past the service and out into the branch circuits. It covers hardwired equipment that has no plug to protect, which is the part homeowners forget: the heat pump, the range, the well pump, the door opener, the alarm.
• At the point of use. ESFI describes the surge suppression receptacle as protecting sensitive electronic equipment from transient surges, notes it is not required by the National Electrical Code, and observes it is often installed in rooms containing costly devices such as computers, televisions or refrigerators. Plug-in strips occupy the same role.

The reason both exist is that they sit at different points on the path. A device at the panel does not sit between your desk outlet and your computer, and a strip behind the television does nothing for the air handler in the attic. Anyone weighing this should ask a provider what the panel device is rated to handle, what it protects, and what it does not.

Where code sits on this

Surge protection has moved from optional to expected in newer construction. ESFI’s surge protection resource tracks the change: in 2017 the National Electrical Code required surge protective devices for equipment such as emergency elevators and fire pump controllers; in 2020 residences were required to have surge protection to safeguard large appliances and equipment such as HVAC systems, as well as life-safety equipment like smoke alarms; and in 2023 dormitories, hotel rooms and bedrooms in nursing homes and limited care facilities were added.

What applies to your house is a separate question. ESFI explains on its National Electrical Code page that the NEC codifies minimum requirements, that it is not itself a law but is commonly mandated by state or city law, and that a new edition is produced every three years. So which edition governs work at your address depends on what your jurisdiction has adopted, which is a question for your building department and for whoever performs the work.

What a panel device will not do for you

Four honest limits, because this is a product that gets oversold.

1. It does not keep the lights on. Surge protection and backup power are different subjects with different hardware. If continuity is the actual goal, that conversation is the one about whole-home generator requests, and the tradeoffs are laid out in the comparison of standby and portable generators.
2. It does not repair the system it sits in. A surge device works against the grounding system it is connected to, and ESFI describes grounding as the path that carries extra current to earth in the event of a short circuit or overload. On a system with grounding problems, that question comes first.
3. It is not a lightning protection system. Those are separate installations with a separate purpose, and no panel device should be sold as one.
4. It does not cover every conductor entering the house. Ask specifically what the proposal addresses and what it leaves out, rather than assuming the answer is everything.

Reading the aftermath of a storm

Homeowners often suspect a surge without being sure. A few observations are worth writing down while they are fresh, because they shape what anyone looking at the system will want to check.

• What failed, and what survived. A single dead device points somewhere different from several failures spread across rooms.
• Whether the failures share a circuit. Clocks that reset everywhere say one thing; three items on one wall say another.
• Whether protective devices tripped, and which ones. A breaker, a ground fault device and an arc fault device each tell a different story.
• Whether anything smells hot, looks discolored or is warm to the touch. That moves the situation out of the electronics category entirely and into a repair conversation.
• The sequence: did the equipment fail during the outage, or when power came back? Ready.gov’s warning about spikes on restoration makes the second case common.

Practical questions before installation

• Does the panel have physical space for the device, and if not, what changes? That answer usually turns the job into a panel-related request.
• Does the device have a status indicator, and how would you know it had reached the end of its useful life?
• Is it replaceable on its own, or does replacement mean more work?
• What does the manufacturer’s documentation say about the conditions it is rated for?
• Will the work be permitted and inspected, and who handles that?
• Ask the provider to confirm their licensing and insurance before scheduling. Reasonable question, easy answer.

What to do during an outage regardless

Hardware does not replace behavior. Ready.gov’s power outage guidance is worth following whether or not a panel device is installed.

• Disconnect appliances and electronics to avoid damage from electrical surges, since power may return with momentary surges or spikes.
• Keep freezers and refrigerators closed. Ready.gov states a refrigerator will keep food cold for about four hours and a full freezer will hold its temperature for about 48 hours.
• Use a generator outdoors only, at least 20 feet away from windows, doors and attached garages, and never use a gas stove or oven to heat the home.
• Install working carbon monoxide detectors on every level of the home.
• Take an inventory of what you rely on that needs electricity, and plan alternatives for medical devices and refrigerated medicines.

Common questions

Do I still need power strips if there is a device at the panel?

The two layers do different jobs at different points. A panel device does not sit between a wall outlet and the equipment plugged into it, which is the gap point-of-use protection is designed for.

Does a generator make surge protection unnecessary?

No. A generator addresses the absence of power. Surge protection addresses the quality of it, including the surges ESFI attributes to equipment cycling inside the building. Households often end up looking at both, along with the condition of the existing service.

How long does a surge device last?

That depends on the product and what it has absorbed, which is why the indicator question matters and why the documentation is worth reading before you buy rather than after. Ask the provider how you are supposed to know when it needs replacing.

My electronics already failed. Is it too late?

For the equipment, probably. For the house, no, and if a surge event damaged wiring or devices, that is separate from the protection question and belongs in a repair request.

Checking what is available near you

This site is a connection service. It does not perform electrical work and has no technicians. It routes requests toward participating providers through service-area matching.

If you want to find out what is available at your address, call (844) 334-2333 and describe your panel and what you want protected. Availability varies. If a participating provider can assist, they may contact you directly, and you decide whether to move forward.