Determining Ka Size Of Mcb

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Hanky123

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I did a test on a 6way 3phase db yesterday and the highest reading of all 3 phases was 3.2ka which I doubled to create 6.4ka, (the recorded reading). Some of the single phase mcbs are only rated to 6ka so should I upgrade them to 10ka or is it ok as they are only using one phase? Thanks in advance.

 
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