This standard applies to the design and qualification of Class 1E control boards@ panels@ and racks. It does not apply to individual components@ modules@ and external field-run cables except as they may affect the design and qualification of Class 1E control boards@ panels@ and racks. Purpose The purpose of this standard is to specify the design and qualification requirements for Class 1E control boards@ panels@ and racks and to establish the methods to verify that these requirements have been satisfied.