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Determining Ka Size Of Mcb


Hanky123

Question

Hanky123

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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3 answers to this question

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Andy™

well you could always try the more accurate sqaure root instead of double...

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NozSpark

LOL,,, a single phase MCB will only carry a single phase PFC

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binky

the Ka rating if for PFCs downstream of the MCB

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