what precautions to be taken while desigining a LT,HT panel. Eg-LT panel PCC pa

what precautions to be taken while desigining a LT,HT panel.
Eg-LT panel PCC panel with ACB installed.
HT panel VCB panel with VCB installed.
& what is main diffrence betwn IP54 & IP55 construction of panel.

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