Standard for Safety — Heating and Cooling Equipment
UL 1995 is a US safety standard for heating and cooling equipment including heat pumps, air conditioners, dehumidifiers, and related products. Its relevance to the battery industry arises from its application to battery-powered HVAC units used in EV thermal management and to battery-integrated climate control systems. Equipment that combines energy storage with heating or cooling functions may require UL 1995 certification alongside battery-specific standards.
Published by: UL Standards and Engagement (formerly Underwriters Laboratories)
Current edition: UL 1995:2023 (5th edition)
Related standards: UL 9540 (energy storage systems), ASHRAE 15 (refrigerating systems)
Scope
UL 1995 covers heating and cooling equipment operating on single-phase and three-phase supply voltages. For battery applications, it is relevant to battery-powered rooftop units for electric trucks and buses, battery-integrated HVAC systems for EV cabins, and BESS enclosures with integrated climate control where the cooling equipment must be safety-certified.
Key Requirements
Electrical and Mechanical Safety
Equipment must meet requirements for insulation resistance, dielectric withstand, grounding continuity, and protection against electric shock. Mechanical requirements cover structural integrity, refrigerant containment, and protection against rotating parts. Thermal cutouts and pressure relief devices must operate within rated limits.
Refrigerant Safety
Requirements address refrigerant charge limits for flammable refrigerants (A2L class such as R-32 and R-454B increasingly used in modern systems), leak detection, and ventilation requirements for equipment rooms. Battery-integrated HVAC using A2L refrigerants must meet both UL 1995 and applicable ASHRAE requirements.
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
- UL 1995, UL Standards
See also: Battery Thermal Management