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Generator Installation · New Hampshire

Generator Installation in New Hampshire

A generator must connect through a transfer switch or an approved interlock so it can never feed power back into utility lines. Electricians install standby generators, portable generator inlets with interlocks, and the transfer equipment for both.

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  • Independent, licensed electricians
  • Local guides for 2 New Hampshire cities

Generator Installation in New Hampshire: what changes city to city

Ice storms and older New England homes make generators and rewiring common projects.

Across the Northeast, homes deal with cold winters, nor'easters and ice storms. Permit offices, utilities and housing stock differ by city, which affects how generator installation is planned and scheduled. These local guides cover the New Hampshire cities where we have written specific notes.

Local guides in New Hampshire

Generator Installation in Manchester, NH

The December 2008 ice storm left many Manchester-area homes without power for days in deep cold, and generators have been a common project ever since. A generator inlet with an interlock lets a portable unit run the boiler or furnace, well pump if there is one, refrigerator and lights safely.

Utility: Eversource

Generator Installation in Nashua, NH

The December 2008 ice storm left much of southern New Hampshire without power, some homes for more than a week in the cold, and nor'easters still cause long outages. Nashua homeowners usually want the furnace or boiler, the sump pump, the well pump in outlying areas and the refrigerator on backup.

Utility: Eversource

Signs it's time to call

  • Frequent outages from storms, ice or heat
  • Medical equipment, sump pumps or freezers that cannot lose power
  • A portable generator with no safe way to connect
  • Planning a whole-home standby unit

How the job usually goes

  1. 1. Size the load

    Circuits that must stay powered are listed and the generator sized.

  2. 2. Choose the connection

    Inlet and interlock, manual transfer switch or automatic transfer switch.

  3. 3. Install and inspect

    Permitted installation, gas connection by a licensed fitter where needed, and inspection.

What moves the price

Electricians set their own prices; local permit fees and utility requirements add to these factors.

  • Portable inlet versus standby system
  • Generator size
  • Transfer switch type
  • Distance from panel and gas source
  • Pad, permits and inspection

Generator Installation in New Hampshire: questions

Who issues permits for generator installation in New Hampshire?

Permits come from the city or county where the home is. For example: Manchester: Electrical permits in Manchester come from the city's building regulations office; other towns issue their own. Nashua: Electrical permits inside city limits come from the City of Nashua's building department.

Which utilities are involved in New Hampshire?

Manchester: Eversource. Nashua: Eversource.

Is an interlock kit legal?

Listed interlock kits are accepted in many jurisdictions when installed with a permit. Your electrician will know the local rule.

More electrical help in New Hampshire

Generator Installation in other states

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