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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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  • Former Community Member
    0 Former Community Member
    To Andy


    The last image in my previous post is for informational purposes only. It illustrates a possible calculation procedure and calculation results at the end consumer. With this, I wanted to explain to the author of the question that the choice of a cable and MCB does not end with calculations of the load current and checking the CCC.

    As I wrote above „calculations can be performed only if the parameters of all elements of the supply circuit from the power transformer to the consumer are known“.  Using the calculation software, the user must simulate the entire circuit for the short-circuit current, including the transformer (with SC-impedance of MV-network) and all cables up to the estimated point.  Of course, I don't have this information.

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  • Former Community Member
    0 Former Community Member
    To Andy


    The last image in my previous post is for informational purposes only. It illustrates a possible calculation procedure and calculation results at the end consumer. With this, I wanted to explain to the author of the question that the choice of a cable and MCB does not end with calculations of the load current and checking the CCC.

    As I wrote above „calculations can be performed only if the parameters of all elements of the supply circuit from the power transformer to the consumer are known“.  Using the calculation software, the user must simulate the entire circuit for the short-circuit current, including the transformer (with SC-impedance of MV-network) and all cables up to the estimated point.  Of course, I don't have this information.

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