U.S. code adoption
Wisconsin — 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 Wisconsin, with primary sources.
Is UL 858 required in Wisconsin?
Yes — effectively. Wisconsin 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 Wisconsin?
Yes. Wisconsin'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 Wisconsin use?
Wisconsin has adopted the 2017 edition of the National Electrical Code (NEC). Wisconsin adopts NEC 2017 by reference via Chapter SPS 316. A rulemaking to adopt NEC 2023 is in progress but not yet effective statewide.
Is UL 9540 required for residential energy storage in Wisconsin?
Yes — effectively. Wisconsin requires NRTL listing for stationary energy storage systems (ESS) in dwellings, and UL 9540 is the controlling standard. ESS in residential dwellings governed by IFC §1207, 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 Wisconsin?
Yes — effectively. Wisconsin requires NRTL listing for energy storage systems, and UL 9540A is the controlling standard.
What is the residential energy-storage capacity limit in Wisconsin?
Wisconsin limits residential energy storage to 20 kWh per dwelling unit.
Which fire code does Wisconsin enforce?
Wisconsin enforces IFC. Wisconsin adopts and modifies the IFC via administrative code.
Code adoption summary
| NEC edition | 2017 NEC |
|---|---|
| Appliance listing (UL 858) | Effectively required |
| NRTL listing requirement | Required |
| Fire code | IFC |
| UL 9540 (residential ESS) | Effectively required |
| UL 9540A propagation test | Effectively required |
| Residential ESS cap | 20 kWh / dwelling |
| NFPA 855 edition | 2017 |
Sources