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

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 Simon Barker over 4 years ago
Or a PHASE CURRENT & LINE CURRENT result of 7.53A if 3000W is entered (which I understand would be the Wattage per phase)

How did you manage to come up with that figure? 3000 / 230 = 13.04. (Which is why we have 13A sockets in the UK). A 9000W wye element is really just three 3000W single phase elements, one per phase.
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0 Simon Barker over 4 years ago
Or a PHASE CURRENT & LINE CURRENT result of 7.53A if 3000W is entered (which I understand would be the Wattage per phase)

How did you manage to come up with that figure? 3000 / 230 = 13.04. (Which is why we have 13A sockets in the UK). A 9000W wye element is really just three 3000W single phase elements, one per phase.
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MCB & Cable Size for 3 Phase Star (Wye) with Neutral

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