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.

Inverters and power control in Massachusetts

Which codes apply? In Massachusetts, inverters and power control systems fall under the 2026 NEC and the 2021 residential IECC.

The inverter, the power control system, and the interconnection to the grid. State record read Oct 18, 2026. Data as of Oct 26, 2026.

Codes that reach inverters and power control systems

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, interconnected power sources, with 690 and 706 for the source and the listing the inverter must carry.

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

    The Massachusetts NEC record
  2. IECC residentialInternational Energy Conservation Code, residential
    2021 IECCVerified

    in force since Oct 11, 2024

    Where it reaches the product. Where a state adopts the solar-ready or storage-ready appendix, the space and the conduit the inverter needs.

    Massachusetts base energy code, 780 CMR Chapter 11R (residential) · 780 CMR Chapter 11R

    The 2024 IECC is in development.

    The Massachusetts IECC residential record

Massachusetts laws that name inverters and power control systems

On the site: two 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)
TSRG Common Technical Standards ManualCommon technical standards manual, Dec 2022Agency guidancePartialIn forceDec 22, 2022Lists utility technical requirements for connecting inverters and storage, such as inverters Listed to UL 1741 and IEEE 1547 trip functions. Source (opens in a new tab)

Every Massachusetts law on inverters and power control systems, 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