Note: I am busy learning about 3 phase alternators. A lot of my understanding is theory so I'm running through scenario's for better understanding.


Lets say we have a 2KW-220V-50Hz 3 phase alternator with 3 live wires and no ground. The voltage between phases are 220V.

We decide that we want to power a 180W induction bench motor and 3x100W light bulbs (480W load) from one of the phases of the alternator.

We know that the 2KW alternator is 80% efficient, So we should be able to safely draw 1600Watts from the combined phases and 533W maximum per phase.

My questions are:

  1. Are 3 phase alternators tolerant of drawing power from only one phase ?
  2. Will drawing from one phase cause the alternator to vibrate more ?
  3. Could drawing from one phase cause the alternator to wear out faster ?
  • \$\begingroup\$ There is no generic answer. Read the data about the generator and don't make assumptions that what may apply to one device will apply to another. \$\endgroup\$ – Andy aka Jun 18 '18 at 9:44
  1. Yes you can draw from one phase only

  2. I don4t think som It never happened to me

  3. It shouldn't be the case if you respect the criteria you mentionned


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