OP
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Thanks Marconi! Thanks evreyone
Discuss 3 X single phase showers in the UK Electrical Forum area at ElectriciansForums.net
Got it - in the case where the 4 conductors are the same ccc but fully loaded and all the loads are single phase only then N will be flogged surely (?).
If, you’ve stopped posting for a bit, I’ll try to explain.
25mm2 is over sized for 100A to allow for imbalances.
The outgoing circuits from the 3 phase board may all be single phase, 3phase or a mixture of both.
The conductors for each outgoing circuit should be sized appropriately.
When the neutral current from phase L1 gets back to the board, it can now use the L2 neutral conductor to flow to the L2 phase, and the neutral current from the L2 phase can use the L3 neutral conductor to flow to the L3 phase, etc.
So once the neutral currents get back to a single point, they can then start to balance themselves out.
In the OP’s situation, there is a very good chance that the 3 showers will not be used at the same time.
However there is a chance that 2 will be used at the same time.
If only 1 or 2 are used, the neutral currents will not be able to balance out.
If all 3 are used at the same time, they will balance out.
As such you need to size the neutral conductor to handle up to 2 lots of current.
Reply to 3 X single phase showers in the UK Electrical Forum area at ElectriciansForums.net
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