This document applies to flow battery systems for stationary use and its installations with a maximum voltage not exceeding DC 1 500 V in compliance with IEC 62932-1. This International Standard defines the requirements and test methods for risk reduction and protection measures against significant hazards, relevant to the flow battery systems, to person, property and the environment, or to a combination of them. This International Standard is applicable to stationary flow battery systems intended for indoor and outdoor commercial and industrial use in non-hazardous (unclassified) areas. This standard contemplates significant hazards, hazardous situations and events, with the exception of those associated with natural disaster, relevant to the flow battery systems, when they are used as intended and under the conditions foreseen by the manufacturer including reasonably foreseeable misuse thereof. The requirements described in this document are not intended to constrain innovations. When considering fluid, materials, designs or constructions not specifically dealt with in this International Standard, these alternatives shall be evaluated as to their ability to yield levels of safety equivalent to those prescribed by this International Standard.