The question is described on title.Since every external circuit or voltage transformer producers do not send plastic covers for S1-S2 connection points, we need to order them additionaly.
I would like to learn that can the transformers be mounted on busbar without covers on connection points?
The current transformer CT installed on busbars, links between main busbar and devices have no voltage on terminals. That the reason why their terminals are not insulated. To the voltage transformer or power transformer usually they are not installed into the form 4b, because it is not a standard installation the place is lacking. They are installed into an auxiliary area and in any case their terminals are insulated.
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