Local authority · Arizona
Phoenix — energy & appliance code adoption
Yes — effectively. Arizona has no statewide electrical or residential building code, so the Phoenix Building Construction Code (and its incorporated 2023 NEC) is the operative AHJ-adopted authority for listing and installation requirements within city limits — there is no state default to layer against. Below: how Phoenix differs from Arizona on appliance listing, NEC, fire code, and energy storage, with sources.
Is UL 858 required in Phoenix?
Yes — effectively. Phoenix 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. Household electric ranges installed under the Phoenix Electrical Code (2023 NEC) must be listed; UL858 is the NRTL standard for household electric ranges, so compliance is effectively required even though the city code does not name UL858 explicitly.
Are NRTL-listed (UL / ETL / CSA) appliances required in Phoenix?
Yes. Phoenix's adopted code requires fixed electrical appliances to be listed by an NRTL (UL, ETL/Intertek, CSA, etc.) — Phoenix Electrical Code (NFPA 70-2023) Art. 110.3 — Phoenix City Code Ch. 9. Per the adopted 2023 NEC, electrical equipment must be listed/labeled by an approved NRTL and installed per the listing. Phoenix's local amendments do not relax this requirement.
Which edition of the NEC does Phoenix use?
Phoenix has adopted the 2023 edition of the National Electrical Code (NEC), effective 2026-04-08. Adopted as the Phoenix Electrical Code based on NFPA 70 (2023). Council action in 2025 advanced the 2024 Phoenix Building Construction Code package; the 2023 NEC component took effect April 8, 2026.
Is UL 9540 required for residential energy storage in Phoenix?
Yes. Phoenix's adopted code requires UL 9540 listing for stationary energy storage systems (ESS) in dwellings. No statewide AZ fire code; the Phoenix Fire Code controls. PFD review for systems over 20 kWh or installed indoors in habitable spaces. UL 9540A required to exceed default cap or reduce separation distances.
Is UL 9540A fire-propagation testing required in Phoenix?
Yes — effectively. Phoenix requires NRTL listing for energy storage systems, and UL 9540A is the controlling standard.
What is the residential energy-storage capacity limit in Phoenix?
Phoenix limits residential energy storage to 20 kWh per dwelling unit.
Which fire code does Phoenix enforce?
Phoenix enforces IFC 2024. Phoenix Fire Code adopted as part of the 2024 PBCC package with city amendments; prior 2018 IFC remained in force with Ord. G-7242 amendments until the 2024 package took effect.
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 Phoenix — Building Construction Codes (PDD)
- Phoenix Amendments to the 2023 National Electrical Code (PDF)
- Phoenix City Code, Chapter 9 — Building
- Phoenix Fire Code (2024 IFC adoption)