Safety & inspections

Whole-home surge protection

A whole-home surge protective device (SPD) mounts at the panel and limits voltage spikes before they reach your circuits. The current National Electrical Code requires one for new and replaced services in dwellings; it works best paired with plug-in protectors for electronics.

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Lightning striking near utility poles at night

About whole-home surge protection

Most surges are small and come from inside the house, when large motors switch on and off. Big ones come from lightning or utility switching. Modern appliances full of circuit boards are vulnerable to both.

A panel SPD is a short install, often done during a panel upgrade. Good grounding and bonding matter as much as the device itself.

Whole-Home Surge Protection at a glance: Safety & inspections
Who does the work: An independent licensed electrician
Urgent calls: Usually scheduled
Typical first step: Check grounding

Signs you need this

Frequent thunderstorms or utility switching
Recent electronics or appliance failures
A panel upgrade or service replacement planned
New HVAC, EV charger or smart appliances

What the electrician does

1
Check grounding
Grounding electrode and bonding are inspected.
2
Install the SPD
The device is mounted on a breaker or lugs with short leads.
3
Verify
Indicator lights and connections are checked.

What affects the cost

Electricians set their own prices. These are the factors that move a quote up or down, so you can compare like for like.

Device rating
Panel space
Grounding corrections
Whether combined with other panel work

What you can do safely, and when to stop

Safe to do

✓ Use plug-in surge strips for computers and TVs

Stop and call

✕ Do not install a panel SPD yourself

Key terms

SPD: Surge protective device; Type 1 installs at the meter, Type 2 at the panel, Type 3 at the point of use.
Clamping voltage: The voltage at which a surge protector begins diverting excess energy; lower is more protective.
Bonding: Connecting metal systems such as water and gas piping to the grounding system so they stay at the same potential.

Whole-Home Surge Protection FAQ

Does a whole-home surge protector replace power strips?

No. It handles large surges at the panel; point-of-use protectors handle smaller ones near sensitive electronics.

What is a whole-home surge protector?

A surge protective device (SPD) installed at the main panel or meter that limits voltage spikes entering through the utility service before they reach the home's circuits.

Is a whole-home surge protector required?

The 2020 and later editions of the NEC require surge protection for new and replaced dwelling services. Whether it applies to your home depends on the code edition your area has adopted and the work being done.

Do I still need plug-in surge protectors?

Yes, for sensitive electronics. Whole-home protection handles large external surges; point-of-use protectors handle smaller surges generated inside the home.

Will a surge protector stop a lightning strike?

No device guarantees protection from a direct strike. Surge protection limits damage from the far more common surges carried in on utility and communication lines.

Where do surges come from?

Lightning, utility switching, downed lines, and large motors in the home such as air conditioners and pumps cycling on and off.

How long do surge protectors last?

They wear with each surge they absorb. Many have an indicator light that shows when protection is no longer active, and they should be checked after major storms.

Does surge protection depend on grounding?

Yes. A surge protector diverts energy to ground, so a sound grounding and bonding system is essential for it to work.

Where electricians offer this

Local guides to whole-home surge protection, with permit offices, housing and utility notes for each city:

Available through our network in 47 states and DC. Metro guides:

Birmingham, AL Huntsville, AL Phoenix, AZ Tucson, AZ Little Rock, AR Los Angeles, CA San Diego, CA Sacramento, CA San Francisco, CA San Jose, CA Fresno, CA Bakersfield, CA Long Beach, CA Oakland, CA Pasadena, CA Denver, CO Colorado Springs, CO Hartford, CT New Haven, CT Wilmington, DE Washington, DC Miami, FL Tampa, FL Orlando, FL Jacksonville, FL Saint Petersburg, FL Fort Lauderdale, FL Atlanta, GA Boise, ID Chicago, IL Indianapolis, IN Des Moines, IA Wichita, KS Louisville, KY New Orleans, LA Baton Rouge, LA Shreveport, LA Baltimore, MD Boston, MA Grand Rapids, MI Minneapolis, MN Saint Paul, MN Kansas City, MO Omaha, NE Lincoln, NE Las Vegas, NV Reno, NV Manchester, NH Trenton, NJ Newark, NJ Albuquerque, NM New York, NY Albany, NY Syracuse, NY Charlotte, NC Greensboro, NC Columbus, OH Cleveland, OH Dayton, OH Akron, OH Oklahoma City, OK Tulsa, OK Portland, OR Philadelphia, PA Pittsburgh, PA Providence, RI Charleston, SC Greenville, SC Nashville, TN Chattanooga, TN Houston, TX Dallas, TX San Antonio, TX Austin, TX Fort Worth, TX Salt Lake City, UT Virginia Beach, VA Norfolk, VA Seattle, WA Spokane, WA Tacoma, WA Huntington, WV Charleston, WV Milwaukee, WI Madison, WI All locations →

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Need help with whole-home surge protection?

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Call (555) 010-0142 Request service