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Does the ,CT/VT's which is located on busbar before the main circuit breaker, need to have covers on secondary connection points within the scope of 4b forming?

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Cadet
Cadet

Does the ,CT/VT's which is located on busbar before the main circuit breaker, need to have covers on secondary connection points within the scope of 4b forming?

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?