· by Michael Blair, Nashville's Electrician
Middle Tennessee has an active storm season and a grid that switches loads regularly. Most surge damage here is not a dramatic strike; it is thousands of small events that shorten the life of everything with a circuit board in it.
What a panel protector does
It clamps voltage at the service entrance, before it reaches branch circuits. That protects hardwired equipment a power strip never touches: the HVAC control board, the oven, the water heater controls, the garage door opener, LED fixtures.
Those are increasingly the expensive failures. A modern furnace or heat pump has a control board that costs more than most of the electronics people bother to protect.
Layered protection is the standard approach
A panel device handles the large external events; point-of-use protectors at sensitive equipment handle what gets through and surges generated inside the house by motors starting and stopping.
Neither replaces the other. A panel unit alone leaves sensitive electronics under-protected; strips alone leave every hardwired appliance unprotected.
What to look for
A device listed for the application, with a clear indicator showing it is still functioning — protectors sacrifice themselves over time and a dead one looks identical to a live one.
Surge protectors need a good ground to work at all. In an older Nashville house with a marginal grounding electrode system, correcting the ground is part of the job rather than an upsell.
- Listed Type 1 or Type 2 device at the panel
- A visible status indicator, checked occasionally
- Verified grounding electrode system
- Point-of-use protection at sensitive equipment
- Protection on incoming coax and data lines too
What it will not do
A direct lightning strike to the house is beyond what any protector is designed to absorb. Surge protection handles induced surges and grid events, which is the overwhelming majority of what actually happens.
It also does nothing about outages or brownouts. Those need a UPS for critical equipment, which is a different product solving a different problem.