Whole‑house surge protection is installed at or near your main electrical panel and must be wired into the live service, so it is best done by a licensed electrician. The device (a surge protective device, or SPD) intercepts large voltage spikes on the incoming power line and safely shunts them to ground before they reach your circuits and appliances.
Where and what to install
A whole‑house SPD is typically mounted inside or adjacent to your main breaker panel, between the utility meter and the panel, so all circuits feed through it. You need a UL‑listed device (often UL 1449, Type 1 or 2) rated for your panel’s voltage and current; many models are designed as a breaker‑style module that snaps into the panel like a regular breaker.
Basic installation steps (for context)
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Turn off main power: The electrician switches off the main breaker, verifies the panel is de‑energized with a voltage tester, then removes the panel cover.
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Mount the SPD: The device is fixed inside the panel or on a nearby junction box, following the manufacturer’s layout; some models install on the top sections of the bus for maximum protection.
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Connect wires: The installer runs short, straight wires from the SPD to a dedicated breaker (often 15–30 A), then connects neutral and ground to the panel’s neutral and ground bars; correct grounding is critical for the SPD to work.
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Test and restore: After tightening all terminations and checking clearances, the panel cover is replaced, main power is restored, and the SPD’s status light is confirmed “on.”
Why you should use a professional
Because the work involves live‑panel risks, code compliance (such as NEC 2020 requirements for whole‑house surge protection in many dwellings), and proper grounding, whole‑house SPD installation is treated as a professional job. A qualified electrician can also integrate it with a lightning‑protection system if you are in a high‑risk area, giving much better protection for TVs, appliances, and other sensitive loads than plug‑in strips alone.