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Thank you all for the info. Will provide some additional details. Why did I add a MCB at the main? Reason to add a 32amp MCB is because the domestic supply in Sri Lanka is 30amp and the wires used from the meter till the MCB is rated for 36amp(6mm) for 3 phase. So In case If I had two 2 hp...

Hi All, I would like to get some advice on this attached plan. For reference the 3 phase is for wood working machines will be using 3hp or lower hp wood working machines at 15amp. I have used a 32amp MCB between the isolator and busbar. Because the here the domestic 3 phase is provided at...