How whole-house surge protection works
Surges can enter through the utility service, but many originate inside the home when large appliances cycle. A panel-mounted SPD handles the larger surges at the service; point-of-use protectors add another layer at sensitive electronics. Together they form a layered approach.
Surge protection is only as good as the grounding it relies on. Installing an SPD is a good time to have your grounding system checked. No surge device can guarantee protection from a direct lightning strike.
What the work typically involves
Check grounding
Verify the grounding electrode and bonding at the service.
Select the SPD
Choose a device appropriate for your panel and service.
Install at the panel
Mount the SPD with short, direct leads for best performance.
Confirm status
Verify indicator lights and explain how to check it periodically.
Common reasons homeowners call
- Frequent thunderstorms
- Replacing electronics after a surge
- New HVAC or appliance investment
- Installing a generator or EV charger
- Home with extensive smart devices
Signs you’d benefit from surge protection
- Electronics failing after storms
- GFCIs or smart devices resetting during storms
- HVAC control boards replaced more than once
- Flickering during storms
- No existing surge protection at the panel
Safety considerations
Protection, not a guarantee. Surge protectors do not replace proper grounding, and none guarantee protection from a direct lightning strike. During severe storms, unplugging sensitive electronics is still a good practice.
What an electrician will check
- Grounding electrode and bonding
- Panel compatibility and breaker space
- Lead length and mounting location
- Point-of-use protection needs
- Communications and cable entry bonding
Related electrical problems
Related residential services
Electrical Grounding
Checking and correcting your home's grounding electrode, bonding and outlet grounding for safer circuits.
Electrical Panel Upgrade
Increasing your home's electrical capacity — typically 100A to 200A — for EV chargers, heat pumps, additions and modern loads.
Whole Home Generator
Permanently installed standby generators sized to power your entire home automatically during outages.
Smart Home Electrical
Wiring and installing smart switches, thermostats, doorbells, cameras, hubs and connected devices in your home.
Frequently asked questions
Many homeowners add one to help protect expensive HVAC equipment, appliances and electronics. It's most effective as part of a layered approach with good grounding.
Yes — point-of-use surge protectors add protection at sensitive electronics.
It can reduce damage from many lightning-related surges, but nothing guarantees protection from a direct strike.