Generator Interlock Kit Installation · Boston, MA
Generator Interlock Kit Installation in Boston, MA
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.
- Call now to check electrician availability in your area
- Independent, licensed electricians
- Serving Dorchester, Jamaica Plain, South Boston and more
Why generator interlock kit installation comes up in Boston
Nor'easters and ice storms can knock out power in Boston's neighborhoods for days, and many homeowners in West Roxbury, Hyde Park and Roslindale use a portable generator connected through an outdoor inlet and a breaker interlock to keep the boiler, refrigerator and sump pump running. The interlock prevents back-feeding Eversource's lines. In triple-deckers, each unit's service needs its own setup.
The generator must run outdoors, away from windows and doors, and clear of snow. Permits come from Boston's Inspectional Services Department. Ask for the circuits it can carry to be labeled.
- Portable-generator inlets with interlocks are common, and standby generators are installed where there is space and a gas supply.
- Never plug a portable generator into a household outlet; an inlet with an interlock is the safe way to connect it.
- Permits in Boston
- In Boston, electrical permits are issued by the Inspectional Services Department, and work must be done by a Massachusetts-licensed electrician.
- Electric utility
- Eversource
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 Boston
Electricians set their own prices. Massachusetts heat-pump incentives are driving a wave of electrification, and most older homes need a service upgrade before a cold-climate heat pump can be installed.
- 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 Boston: questions
Do I need a permit for generator interlock kit installation in Boston?
Usually, yes. In Boston, electrical permits are issued by the Inspectional Services Department, and work must be done by a Massachusetts-licensed electrician. The electrician normally pulls the permit and schedules the inspection.
Is the utility involved in Boston?
If the work affects the meter or service, the electrician coordinates with Eversource, 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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