U.S. code adoption
New Hampshire — energy & appliance code adoption
Yes — effectively. This page summarizes electrical (NEC), appliance-listing (UL 858), fire-code, and energy-storage (UL 9540 / NFPA 855) code adoption for New Hampshire, with primary sources.
Is UL 858 required in New Hampshire?
Yes — effectively. New Hampshire requires fixed household appliances to be listed by a Nationally Recognized Testing Laboratory (NRTL), and UL 858 is the de-facto listing standard a household electric range must meet.
Are NRTL-listed (UL / ETL / CSA) appliances required in New Hampshire?
Yes. New Hampshire's adopted code requires fixed electrical appliances to be listed by an NRTL (UL, ETL/Intertek, CSA, etc.) — NEC 110.3.
Which edition of the NEC does New Hampshire use?
New Hampshire has adopted the 2023 edition of the National Electrical Code (NEC), effective 2025-07-01. Adopted by the NH Electricians' Board with state-specific amendments. Prior edition (NEC 2020) was effective 2022-07-01.
Is UL 9540 required for residential energy storage in New Hampshire?
Yes — effectively. New Hampshire requires NRTL listing for stationary energy storage systems (ESS) in dwellings, and UL 9540 is the controlling standard. ESS in residential dwellings governed by NFPA 1 Ch. 52, referencing UL 9540 listing and NFPA 855 installation standard. UL 9540A required to exceed the default 20 kWh / dwelling cap or reduce default 3-ft separation.
Is UL 9540A fire-propagation testing required in New Hampshire?
Yes — effectively. New Hampshire requires NRTL listing for energy storage systems, and UL 9540A is the controlling standard.
What is the residential energy-storage capacity limit in New Hampshire?
New Hampshire limits residential energy storage to 20 kWh per dwelling unit.
Which fire code does New Hampshire enforce?
New Hampshire enforces NFPA-1 2021. State fire code adopts NFPA 1 (2021) and NFPA 101 (2021).
Code adoption summary
| NEC edition | 2023 NEC |
|---|---|
| Appliance listing (UL 858) | Effectively required |
| NRTL listing requirement | Required |
| Fire code | NFPA-1 2021 |
| IRC edition | 2021 IRC |
| UL 9540 (residential ESS) | Effectively required |
| UL 9540A propagation test | Effectively required |
| Residential ESS cap | 20 kWh / dwelling |
| NFPA 855 edition | 2020 |
Sources
- NFPA — NEC enforcement maps
- NH Division of Fire Safety — State Building Code
- NH Division of Fire Safety — Fire Codes Adopted
- NH Bulletin — Plug and play solar in NH
- Canary Media — VT and NH plug-in solar