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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.

Parents

0 Former Community Member over 4 years ago

If you use convenient calculation tools, the task is very simple.

Load = 3 Phase Immersion Element
P = 9kW
Line voltage (phase-phase) = 400V
Cos phi = 1.0
Phase current = 12.99 A

The current carrying capacity depends on the installation conditions.

Cable selected = Cu 2.5mm2 3p+N,

Protection = MCB 3x16A

and calculation report:
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0 Former Community Member over 4 years ago

If you use convenient calculation tools, the task is very simple.

Load = 3 Phase Immersion Element
P = 9kW
Line voltage (phase-phase) = 400V
Cos phi = 1.0
Phase current = 12.99 A

The current carrying capacity depends on the installation conditions.

Cable selected = Cu 2.5mm2 3p+N,

Protection = MCB 3x16A

and calculation report:
Cancel
Vote Up 0 Vote Down

Cancel

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

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