UL 9540A Test Method

As a leading global safety science company and a leader in energy storage technology testing, we serve the entire industry value chain through our comprehensive regulatory knowledge and l laboratories.

We designed services to help reduce the complexities associated with energy storage systems and support your drive to deliver safer and better technologies to the global marketplace.

Discover the UL 9540A Test Method

The UL 9540A Test Method is referenced within UL 9540, the Standard for Energy Storage Systems and Equipment, the American and Canadian National Standard for Safety for Energy Storage Systems and Equipment, the International Code Council (ICC) International Fire Code (IFC), National Fire Protection Association NFPA 855, Standard for the Installation of Stationary Energy Storage Systems, as well as a wide variety of local, state and international building and fire codes.

UL 9540A addresses the safety concerns identified by the building codes and the fire service in the United States. One of the primary concerns that NFPA 855 (and the fire codes) tries to address is the potential fire and explosion hazards associated with a battery system, such as an uninterrupted power supply (UPS) or battery energy storage system (BESS). The codes specify very stringent limits for energy capacity and separation distances to control this hazard. For example, the current ICC International Fire Code (2021 IFC) allows an individual BESS unit not to exceed 50 kWh and to have a maximum quantity of systems totaling 600 kWh of energy per indoor fire area (battery room) or outdoor, near exposures. It also limits individual residential systems from exceeding 20kWh and having a maximum quantity of up to 80 kWh. These BESS units must be installed with a three-foot (one meter) separation distance between units and between units and any wall. The latest IFC and NFPA 855 editions allow the code authority to approve larger individual BESS units and separation distances of less than three feet based on large-scale fire testing conducted per the UL 9540A Test Method.

Results from the UL 9540A Test Method address the following key issues identified by building codes and the fire service:

• BESS installation instructions
• Installation ventilation requirements
• Effectiveness of fire protection (integral or external)
• Fire service strategy and tactics

We will work with you to understand your products and develop an individualized test plan that meets your company's needs.

We are a leader in battery safety technology

We are a leader in battery safety technology. We helped develop the stationary battery standard, ANSI/CAN UL 1973, the Standard for Batteries for Use in Stationary and Motive Auxiliary Power Applications, the energy storage system standard ANSI/CAN UL 9540, Energy Storage Systems and Equipment, as well as the recent UL 9540A Test Method. We offer:

• Unparalleled availability of our full fire testing facilities — no need for subcontracting
• Experienced engineering and research teams that can help develop insights using in-depth knowledge of battery chemistries and fire suppression
• Demonstrable track record of success serving organizations and entities such as fire departments as well as electrical and building inspectors