Generator Interlock Kit Installation · Seattle, WA
Generator Interlock Kit Installation in Seattle, WA
A generator interlock kit is a mechanical slide on the main panel that prevents the main breaker and the generator breaker from being on at the same time. With an exterior power inlet, it lets a portable generator power chosen circuits without backfeeding the utility.
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- Independent, licensed electricians
- Serving Ballard, Capitol Hill, West Seattle and more
Why generator interlock kit installation comes up in Seattle
Seattle's windstorms, such as the December 2006 Hanukkah Eve storm, and winter snow events bring down trees across lines, and outages in wooded neighborhoods can last days. A portable generator connected through an outdoor inlet and a breaker interlock can run the furnace or heat pump air handler, the refrigerator and a few lights. The interlock prevents back-feeding Seattle City Light's lines.
The generator must run outdoors, away from windows and doors, sheltered from rain. Permits come from the Seattle Department of Construction and Inspections. Ask for the circuits it can carry to be labeled.
- Windstorm outages and generator inlet installations.
- The most common setup is a generator inlet with an interlock, letting a portable generator power heat, the refrigerator and some lights safely without backfeeding the grid.
- Permits in Seattle
- Seattle issues its own electrical permits through the Seattle Department of Construction and Inspections (SDCI); most of the rest of Washington is permitted by the state Department of Labor and Industries.
- Electric utility
- Seattle City Light
Signs to look for
- You own or plan to buy a portable generator
- Outages in your area last hours or days
- You need to keep a sump pump, furnace or well pump running
- You want backup power without a standby generator
How the work is done
1. Match the panel
The electrician confirms an interlock kit is listed for your panel model.
2. Install the inlet
An exterior power inlet box is mounted near where the generator will run, away from windows.
3. Install interlock and breaker
The generator breaker and interlock are installed in the main panel.
4. Test and inspect
Changeover is tested and the work is inspected.
What moves the price in Seattle
Electricians set their own prices. Converting from oil or gas heat to a heat pump, adding an induction range and an EV charger is a common path, and it usually starts with a panel and service upgrade.
- Interlock kit availability for your panel
- Inlet amperage (30 or 50 amp)
- Distance from panel to inlet
- Generator cord length and type
- Permit fees
Generator Interlock Kit Installation in Seattle: questions
Do I need a permit for generator interlock kit installation in Seattle?
Usually, yes. Seattle issues its own electrical permits through the Seattle Department of Construction and Inspections (SDCI); most of the rest of Washington is permitted by the state Department of Labor and Industries. The electrician normally pulls the permit and schedules the inspection.
Is the utility involved in Seattle?
If the work affects the meter or service, the electrician coordinates with Seattle City Light, which owns the meter and service drop.
Is an interlock kit legal?
Yes, when it is listed for your panel and installed with a permit; it is a recognized way to prevent backfeeding.
Interlock kit or transfer switch?
An interlock uses your existing panel and lets you pick circuits; a transfer switch has dedicated circuits or switches automatically with a standby generator.
What can a portable generator run?
Typically a furnace blower, refrigerator, sump pump, lights and a few outlets, depending on its wattage.
Where should the inlet go?
Outside, near a safe spot to run the generator, well away from doors, windows and vents.
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