UL 2849

Standard for Electrical Systems for eBikes

UL 2849 is the UL safety certification standard for the complete electrical drive train of electric bicycles, covering the battery system, battery management system (BMS), drive unit (motor and controller), charger, and interconnecting wiring as an integrated assembly. Published in 2020 and adopted by OSHA as a National Recognized Testing Laboratory (NRTL) standard in 2021, UL 2849 became legally mandatory in New York City in September 2023 following a series of fatal e-bike battery fires. The standard addresses the electrical and fire safety hazards unique to e-bike electrical systems, filling the gap between cell-level (UL 1642), pack-level (UL 2271), and full system integration — which is where real-world fire risk originates in e-bikes.

Published by: UL Standards & Engagement (ULSE)

Current edition: UL 2849:2020

OSHA NRTL recognition: November 2021

Scope

UL 2849 covers the complete electrical system of electric bicycles as an integrated assembly:

  • Complete e-bike electrical system: battery, BMS, motor controller, charger, and wiring harness evaluated as a system
  • Covers both EPAC (pedal-assist) and non-pedal-assist electric bicycles
  • Construction, performance, marking, and instruction requirements addressing environmental, mechanical, and electrical hazards
  • Fire and electric shock risk mitigation for the integrated system
  • Charger compatibility and overcharge protection requirements

Relationship to other standards

UL 2849 addresses the complete e-bike electrical system as an assembly. UL 1642 covers individual lithium cells; UL 2271 covers battery packs for light electric vehicles at the pack level. UL 2272 covers personal e-mobility devices (scooters, hoverboards). In Europe, BS EN 50604-1 and EN 50604-2 regulate LEV batteries, and ECE R136 covers light electric vehicle safety. In China, GB 17761-2024 is the mandatory e-bike standard. The combination of UL 1642 + UL 2271 + UL 2849 together covers cells, packs, and the complete e-bike system in the US market.

Disclaimer: This is not a definitive guide, just an indication and it is important that you always go back to the source for legislation.

References

  1. UL 2849:2020 — Standard for Electrical Systems for eBikes, UL Standards & Engagement