U.S. code adoption
Connecticut — 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 Connecticut, with primary sources.
Is UL 858 required in Connecticut?
Yes — effectively. Connecticut 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 Connecticut?
Yes. Connecticut'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 Connecticut use?
Connecticut has adopted the 2020 edition of the National Electrical Code (NEC).
Is UL 9540 required for residential energy storage in Connecticut?
Yes. Connecticut's adopted code requires UL 9540 listing for stationary energy storage systems (ESS) in dwellings. CT State Fire Marshal (DESPP) adopts NFPA 1 statewide; ESS via NFPA 1 Ch. 52.
Is UL 9540A fire-propagation testing required in Connecticut?
Yes — effectively. Connecticut requires NRTL listing for energy storage systems, and UL 9540A is the controlling standard.
What is the residential energy-storage capacity limit in Connecticut?
Connecticut limits residential energy storage to 20 kWh per dwelling unit.
Which fire code does Connecticut enforce?
Connecticut enforces other.
Code adoption summary
| NEC edition | 2020 NEC |
|---|---|
| Appliance listing (UL 858) | Effectively required |
| NRTL listing requirement | Required |
| Fire code | other |
| UL 9540 (residential ESS) | Required |
| UL 9540A propagation test | Effectively required |
| Residential ESS cap | 20 kWh / dwelling |
| NFPA 855 edition | 2023 |
Sources
- NFPA — NEC enforcement maps
- CT State Fire Safety Code / Fire Prevention Code
- CT Mirror — Will CT make plug-in solar legal?