Codes of Record

What applies to my job?

Pick the state and the product you build, install, or inspect. The card below answers from each state’s own record.

Interconnection devices in Massachusetts

Which codes apply? In Massachusetts, interconnection devices fall under the 2026 NEC and the 2021 IRC.

Backup switches, gateways, meter adapters, and the device that islands a home. State record read Oct 18, 2026. Data as of Oct 26, 2026.

Codes that reach interconnection devices

The edition Massachusetts enforces for each code that governs the product, and the part of the code that does.

  1. NECNational Electrical Code
    2026 NECVerified

    in force since Apr 24, 2026

    Where it reaches the product. Article 705 for the point of connection, 230 for the service, and 702 for optional standby systems.

    Massachusetts Electrical Code (527 CMR 12.00), 2026 edition · 527 CMR 12.00

    The Massachusetts NEC record
  2. IRCInternational Residential Code
    2021 IRCVerified

    in force since Oct 11, 2024

    Where it reaches the product. Chapter 37 and the electrical provisions that mirror the NEC.

    Massachusetts Residential Code (780 CMR 51.00), Tenth Edition, Residential Volume · 780 CMR 51.00, s. R101.1

    The 2024 IRC is in development.

    The Massachusetts IRC record

Massachusetts laws that name interconnection devices

On the site: three laws, rules, orders, and bills, newest first.

Law or ruleKindStageDateWhat it does
NSTAR Electric Company d/b/a Eversource EnergyInterconnection tariff M.D.P.U. No. 55DTariffPartialIn forceMay 1, 2026Sets one utility's interconnection rules, including a simplified track for listed inverter systems of 25 kilowatts or less. Source (opens in a new tab)
D.P.U. 25-48Commission orderPartialIn forceFeb 10, 2026Revised the model interconnection tariff that each utility's own tariff follows. Source (opens in a new tab)
S.2270S.2270, 194th General Court (Senate Docket 2553)BillVerifiedPendingDec 15, 2025Proposes requiring each electric company to run a virtual power plant program paying customer-sited distributed energy resources for peak load reduction. Source (opens in a new tab)

Every Massachusetts law on interconnection devices, with filters

For information only. Your local building or fire official decides which code applies. We check state records often but can miss a recent change, so confirm with your official before you design, permit, or install. Terms of use