Local authority · Pennsylvania
Philadelphia — energy & appliance code adoption
Yes — effectively. Mirrors the PA UCC baseline (2020 NEC since 2025-07-13; 2018 I-Codes pending 2026-01-01 transition to 2021 I-Codes) without material divergence; local administration via Philadelphia Code Title 4 subcodes B/E/F/R, but no city-specific appliance-listing amendments identified. Below: how Philadelphia differs from Pennsylvania on appliance listing, NEC, fire code, and energy storage, with sources.
Is UL 858 required in Philadelphia?
Yes — effectively. Philadelphia 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 must be listed/labeled per NEC 110.2-110.3 as adopted via Subcode 'E'; UL858 is the NRTL standard for household electric cooking appliances.
Are NRTL-listed (UL / ETL / CSA) appliances required in Philadelphia?
Yes. Philadelphia's adopted code requires fixed electrical appliances to be listed by an NRTL (UL, ETL/Intertek, CSA, etc.) — Phila. Code Title 4 Subcode 'E' incorporating NEC 110.2 / 110.3. All electrical equipment must be approved (listed and labeled by an NRTL) per NEC 110.2-110.3 as adopted; L&I enforces through Subcode 'E'.
Which edition of the NEC does Philadelphia use?
Philadelphia has adopted the 2020 edition of the National Electrical Code (NEC), effective 2025-07-13. PA UCC moved from 2017 NEC to 2020 NEC on 2025-07-13. The 2021 I-Code suite (IBC/IRC/IFC/IECC) follows on 2026-01-01; the electrical code update was decoupled and landed earlier.
Is UL 9540 required for residential energy storage in Philadelphia?
Yes. Philadelphia's adopted code requires UL 9540 listing for stationary energy storage systems (ESS) in dwellings. PFD plan review required for ESS over the residential threshold or in multi-family. No statewide IRC Appx AW adoption; residential 1-2 family follows IFC §1206.11 via Subcode F. UL 9540A needed for >20 kWh aggregate.
Is UL 9540A fire-propagation testing required in Philadelphia?
Yes — effectively. Philadelphia requires NRTL listing for energy storage systems, and UL 9540A is the controlling standard.
What is the residential energy-storage capacity limit in Philadelphia?
Philadelphia limits residential energy storage to 20 kWh per dwelling unit.
Which fire code does Philadelphia enforce?
Philadelphia enforces IFC 2018. Philadelphia Fire Code follows the PA UCC fire code adoption; locally enforced by PFD and L&I.
Code adoption summary
| NEC edition | 2020 NEC |
|---|---|
| Appliance listing (UL 858) | Effectively required |
| NRTL listing requirement | Required |
| Fire code | IFC 2018 |
| IRC edition | 2018 IRC |
| UL 9540 (residential ESS) | Required |
| UL 9540A propagation test | Effectively required |
| Residential ESS cap | 20 kWh / dwelling |
| NFPA 855 edition | 2020 |
Sources
- Philadelphia L&I — 2021 I-Code Transition Materials
- Philadelphia L&I Code Bulletin B-2501 — Implementation of 2021 International Codes
- Philadelphia Code Title 4 Subcode 'E' (Electrical Code)
- PA DLI — 2021 ICC Code Adoption Final Report
- Philadelphia Fire Code — Title 4 Subcode F