Local authority · Arizona
Tucson — energy & appliance code adoption
Yes — effectively. Arizona has no statewide building or electrical code. Tucson's locally adopted ordinance is the operative authority within city limits. Below: how Tucson differs from Arizona on appliance listing, NEC, fire code, and energy storage, with sources.
Is UL 858 required in Tucson?
Yes — effectively. Tucson 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. UL858 is the recognized NRTL standard for household electric ranges.
Are NRTL-listed (UL / ETL / CSA) appliances required in Tucson?
Yes. Tucson's adopted code requires fixed electrical appliances to be listed by an NRTL (UL, ETL/Intertek, CSA, etc.) — Tucson Code Ch. 6 / NEC 110.3(B). NRTL listing required; equipment installed per the listing.
Which edition of the NEC does Tucson use?
Tucson has adopted the 2023 edition of the National Electrical Code (NEC), effective 2026-01-01. Adopted via Ord. 2025-15 (June 3, 2025) as part of the 2024 ICC family update. Permits filed on/after Jan 1, 2026 must comply. Prior edition was 2017 NEC (effective Jan 1, 2019).
Is UL 9540 required for residential energy storage in Tucson?
Yes. Tucson's adopted code requires UL 9540 listing for stationary energy storage systems (ESS) in dwellings. Tucson Fire plan review required for ESS exceeding residential thresholds or in Group R-2. UL 9540A LSFT required for >20 kWh or to reduce 3-ft spacing. IRC Appx AW (2024) caps aggregate at 80 kWh for 1-2 family.
Is UL 9540A fire-propagation testing required in Tucson?
Yes — effectively. Tucson requires NRTL listing for energy storage systems, and UL 9540A is the controlling standard.
What is the residential energy-storage capacity limit in Tucson?
Tucson limits residential energy storage to 20 kWh per dwelling unit.
Which fire code does Tucson enforce?
Tucson enforces IFC 2024. Enforced by Tucson Fire Department.
Code adoption summary
| NEC edition | 2023 NEC |
|---|---|
| Appliance listing (UL 858) | Effectively required |
| NRTL listing requirement | Required |
| Fire code | IFC 2024 |
| IRC edition | 2024 IRC |
| UL 9540 (residential ESS) | Required |
| UL 9540A propagation test | Effectively required |
| Residential ESS cap | 20 kWh / dwelling |
| NFPA 855 edition | 2023 |
Sources
- City of Tucson PDSD — Updated Building Codes Effective Jan 1
- Tucson Code Ch. 6 — Buildings, Electricity, Plumbing & Mechanical
- Tucson Fire Department — Fire Prevention