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What is the meaning of PI (insulation partition) class for SM6 as mention on Catalogue.

The partition class is defined between energized components and an open compartment, based on the type of partition:
«A switchgear component contained in a metallic enclosure and separating one compartment from another»:
  - PM: metallic partitions
  - PI: insulating partitions
 
So "PI" denote the insulation partitions means the switchgear component contained in a metallic enclosure and separating one compartment from another as an insulating partition.
 
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