Whole-Home Surge Protection Guide — Saint Paul & Twin Cities
Modern homes have sensitive electronics everywhere—HVAC boards, ranges, refrigerators, computers, and TVs. A whole-home surge protective device (SPD) helps shield these from utility and switching surges. This quick guide explains SPD types, placement, and what to expect. If you’re ready to add protection, jump to our service page below.
Get surge protection: Whole-Home Surge Protection Service →
SPD Basics
- Type 1 vs Type 2: Type 1 installs line-side or load-side of the service; Type 2 installs on the load side (at the main or sub-panel). Both are common in residences.
- UL 1449 listing: Choose listed devices with appropriate nominal discharge current and let-through ratings.
- Modes of protection: L-N, L-G, N-G. Proper bonding/grounding is critical to SPD performance.
Placement & Installation
- Shortest leads: Mount close to the panel with short, straight conductors to reduce let-through voltage.
- OCPD & labeling: Follow manufacturer specs for breaker size or integral protection; label at the panel.
- Service & sub-panels: Main panel is typical; sensitive sub-panels may benefit from additional SPDs.
Layering Protection
- Whole-home + point-of-use: Use quality plug-in strips for electronics to complement the panel SPD.
- HVAC & appliances: Many manufacturers recommend surge protection for control boards.
FAQ
Do I need a permit?
Panel-mounted SPDs often require a permit/inspection when adding a new breaker or wiring changes. We’ll advise for your city.
Will it protect against direct lightning strikes?
No device guarantees protection from a direct strike. SPDs help with common utility and switching surges and can reduce damage risk. For lightning-prone sites, consider a full lightning protection system.
Do I still need power strips?
Yes—use panel SPD for whole-home reduction and quality point-of-use protectors for sensitive electronics.
How long do SPDs last?
They wear with each surge event. Many units have status indicators/warranty. We recommend periodic checks and replacement if the indicator shows failure.
Next Steps
Want cleaner, safer power for your home? We install listed SPDs with proper wiring, labeling, and inspection coordination where required.