Current protection

Hi all, hope you can help,

I have an incoming supply of 2 x 160A TP&N MCCB it supplies an external bypass unit which contains 2No 200A TP&N MCCB's, from there it supplies a 2 x 30KvA UPS via 160A Fuses, the output of the UPS returns to external bypass switch via another 200A TP&N MC

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