1.1 This standard applies to polycrystalline semi-conductor rectifier stacks and stack assembly used for supplying DC power from AC sources at frequencies up to 2 000 c/s.
1.2 This standard does not apply to telecommunication rectifiers other than those for power supplied to such apparatus, nor to rectifiers used as auxiliaries to measuring instruments. Further, it does not include the main transformer or other associated transformers and apparatus, nor does it apply to rectifiers based on mono-crystalline semi-conductor materials.