The purpose of this standard is to provide basic principles and guidance to demonstrate the qualification of equipment. Qualification is intended to confirm the adequacy of the equipment design to perform its required function or functions over the expected range of operational conditions, which could include any combination of normal, abnormal, design basis event, design extension condition, or in-service test conditions for which the equipment has a required function. The level of qualification depends on the nature of the required function; a required safety function necessitates a higher level of qualification than a function that is not classified as safety-related. See IEEE Std 603(TM) for additional guidance on the classification of electrical equipment. For those facilities adopting a risk-informed categorization program, see IEEE Std 1819(TM) [B36] for additional guidance on the risk-informed classification of electrical and electronic equipment.