IEC 62485-2 specifies safety requirements for stationary secondary battery installations, published by the International Electrotechnical Commission (IEC). It is Part 2 of the IEC 62485 series and covers the safety of batteries during installation, operation, inspection, maintenance, and disposal. The standard addresses the principal hazards associated with stationary batteries — electrical hazards, electrolyte hazards, and hydrogen gas evolution — and is the primary safety reference for lead-acid and nickel-cadmium stationary battery installations worldwide.
Published by: International Electrotechnical Commission (IEC)
Current edition: IEC 62485-2:2016
Adopted as: EN IEC 62485-2:2018 (Europe)
Companion standards: IEC 62485-3 (traction batteries), IEC 62485-5 (stationary lithium-ion), IEC 60896-22 (VRLA requirements)
Scope
IEC 62485-2 applies to stationary secondary batteries and battery installations with a maximum DC voltage of 1,500 V. It covers lead-acid batteries (vented and VRLA types) and nickel-cadmium batteries used in stationary applications including UPS, telecoms backup, emergency power, and grid support. The standard specifies requirements for battery room design, ventilation, electrical protection, acid-resistant flooring, emergency equipment, and personnel safety procedures. For lithium-ion stationary batteries, the more specific requirements of IEC 62485-5 apply.
Key Requirements
The standard requires that stationary battery installations provide adequate ventilation to prevent hydrogen gas accumulation above 4% volume (the lower explosive limit). Ventilation calculations are based on the maximum hydrogen evolution rate during charging, battery room volume, and the number of air changes per hour. Electrical requirements include insulation of battery racking from ground, provision of appropriate warning signs, and protection of maintenance personnel against inadvertent short circuits.
Requirements for electrolyte handling cover provisions for acid-resistant flooring and battery trays, emergency eyewash facilities, and personal protective equipment. The standard also addresses requirements for battery room lighting, access restrictions, and the procedures for safe commissioning, maintenance, and decommissioning of battery installations.
Relevance to Battery Engineering
For engineers designing or commissioning stationary battery installations, IEC 62485-2 provides the definitive set of safety requirements against which battery room designs must be checked. The ventilation requirements are particularly critical — undersized ventilation in a lead-acid battery room is a genuine explosion risk. The standard is referenced in building regulations and electrical installation standards across Europe and many other markets, making compliance effectively mandatory for professional stationary battery installations. As lithium-ion technology displaces lead-acid in stationary applications, engineers transitioning installations should be aware that IEC 62485-5 applies to lithium-ion systems and has different requirements, particularly around fire suppression and thermal runaway management.
Disclaimer: This is not a definitive guide, just an indication and it is important that you always go back to the source for legislation.