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IEC - Transformer Neutral CT connection and CT box

IEC - Transformer Neutral CT connection and CT box

IEC - Transformer Neutral CT connection and CT box

(OP)
Hi Would appreciate some basic advise please. We have IEC, Dyn11, 11kV/400V 2 MVA oil filled transformers. Transformer neutral has CT for earth fault protection (64 and 51G). If it matters we have number of different transformers of same type and rating, some connected to secondary 3 phase, 3 wire LV switchgear and some to 3 phase, 4 wire LV switchgear.

My question is it required to have transformer CTs installed in a separate box. Transformer manufacturer is providing one secondary box where all phase and neutral terminals are provided for our cable connection. is it ok to put the CT in the same box. do I need a separate terminal box for CT or if its in one box with other LV connections, do i need a partition in box?
ta

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