This International Standard is applicable to the terminal markings for the main circuits of valve
device stacks and assemblies, and of integrated conversion equipment. The terminal
markings refer to stacks, assemblies and equipment comprising semiconductor valve devices.
The object of this standard is to specify a logical alphanumeric marking system for the
identification of the external main terminals of the main power circuits in a stack, valve device
assembly or integrated conversion equipment, which is applicable for the purpose of
reference in circuit diagrams, catalogues, descriptions, and information exchange and storage.
In the case of stacks and assemblies, alphanumeric terminal marking systems are indicated
for those converter connections which are the most important and most commonly used ones.
Terminal marking systems making use of graphic symbols or identifying colours are not
considered in this standard.