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Whole-Home Surge Protection · Maryland
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.
Baltimore rowhomes and older suburbs carry aging wiring, and summer storms bring surge and outage calls.
Across the Mid-Atlantic, homes deal with humid summers, coastal storms and occasional ice. Permit offices, utilities and housing stock differ by city, which affects how whole-home surge protection is planned and scheduled. These local guides cover the Maryland cities where we have written specific notes.
Summer thunderstorms move across Montgomery County most afternoons in July, and the mature oaks over Woodside Park, Indian Spring and Sligo Park Hills mean lines come down often enough that surges on restoration are common too. Silver Spring has many home offices tied to federal agencies and contractors, so the equipment at risk includes computers, monitors and network gear as well as heat pump boards and smart thermostats.
Utility: Pepco
Thunderstorms over the Chesapeake Bay bring frequent lightning to Annapolis, and waterfront homes can be especially exposed. Surges commonly damage heat pump controls, boat lift motors, dock lighting and electronics.
Utility: BGE
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.
Electricians set their own prices; local permit fees and utility requirements add to these factors.
Permits come from the city or county where the home is. For example: Silver Spring: Electrical permits come from Montgomery County's Department of Permitting Services. Annapolis: Electrical permits inside city limits come from the City of Annapolis' planning and zoning permits office; Anne Arundel County handles areas outside the city.
Silver Spring: Pepco. Annapolis: BGE.
No. It handles large surges at the panel; point-of-use protectors handle smaller ones near sensitive electronics.
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