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MCB & Cable Size for 3 Phase Star (Wye) with Neutral

Nano Brewery
Hi, I'm trying to understand/figure out what MCB & Cable Size would be required for a 3 Phase 9kW Immersion Element wired in Star using Neutral?  I have been a little confused by the results when using various online calculators. One example here: https://www.watlow.com/resources-and-support/engineering-tools/3phase-delta-wye-calculator

i.e. Using a Line Voltage of 400V equals a Phase & Line Current of 12.99A.  Where as using a Phase Voltage of 230V equals a Phase & Line Current of 22.59A?


My questions are:

1. Are these calculations correct?

2. What Amperage MCB would be required?

3. Would the MCB required need to be 3P, 3P+N or 4P?

3. Would 1.5mm2 cable at a 6 meter run be adequate?


Thanks in advance for your feedback and help.
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  • 0
    calculate the minimum SC current at the immersion element. The calculated minimum SCC (rms value) allows to verify disconnection time of the MCB.

    Where is the c.p.c. described? Without that information I don't see how you can calculate the minimum fault current. Or is there a presumption that the c.p.c. is identical to the live conductors (which is probably not a safe assumption given many of the UK practices).

       - Andy.
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  • 0
    calculate the minimum SC current at the immersion element. The calculated minimum SCC (rms value) allows to verify disconnection time of the MCB.

    Where is the c.p.c. described? Without that information I don't see how you can calculate the minimum fault current. Or is there a presumption that the c.p.c. is identical to the live conductors (which is probably not a safe assumption given many of the UK practices).

       - Andy.
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