How to size Ats ?



1- Volt of ATS (0.4 KV)
2_ Current of ATS ( min 750A man 1200A) .
3- Type (3pole ATS ,4pole ATS )
Reliability of ATS > Reliability of Neutral_PE line then 4pole ATS .
Reliability of ATS < Reliability of Neutral_PE line then 3pole ATS .

Electrical Power ENG Afdal Salloum .