Generator Interlock Kit Installation · Massachusetts

Generator Interlock Kit Installation in Massachusetts

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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Local notes for 2 Massachusetts cities

A standby generator on a concrete pad beside a house

Generator Interlock Kit Installation across Massachusetts

Generator Interlock Kit Installation in Boston, MA

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.

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. Nor'easters and ice also bring outages.

Generator Interlock Kit Installation in Springfield, MA

The October 2011 snowstorm, which dropped heavy wet snow on trees still in leaf, left most of Springfield without power for days, and many homeowners have since set up a portable generator with an outdoor inlet and a breaker interlock. It runs the boiler or furnace, refrigerator, sump pump and lights without back-feeding Eversource's lines.

Victorian homes and multi-family houses often have knob-and-tube, cloth wiring and separate small services for each unit. Many homes damaged in 2011 were repaired, leaving a mix of new and old wiring.

What generator interlock kit installation involves

Plugging a generator into a wall outlet, or a "suicide cord", can send power back onto utility lines and injure line workers. An interlock and inlet box is the lower-cost, code-compliant alternative to a full transfer switch.

With an interlock, you choose which circuits to run during an outage, such as the furnace blower, refrigerator, sump pump and some lights, within the generator's capacity.

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

What moves the price

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 Massachusetts: questions

Where in Massachusetts is generator interlock kit installation common?

Our local notes cover Boston, Springfield. 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.

Who issues permits for generator interlock kit installation in Massachusetts?

The city or county building department where the home is. Boston: In Boston, electrical permits are issued by the Inspectional Services Department, and work must be done by a Massachusetts-licensed electrician. Springfield: Electrical permits come from the City of Springfield's Code Enforcement building division.

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.

Related help in Massachusetts

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