The electric motor nameplate (pictured) has a variety of different voltage configurations which are listed. I understand that the motor can be configured to run on different voltages by changing the way the windings are connected. The different voltage configurations are as follows:

  • 690 VY - Wye (windings see 400V)
  • 400 VD - Delta (windings see 400V)
  • 660 VY - Wye (windings see 380V)
  • 380 VD - Delta (windings see 380V)
  • 415 VD - Delta (windings see 415V)
  • 460 VD - Delta (windings see 460V)

For all of these configurations, the windings see between 380 - 460 V, or 1.33 - 2.33 A. So it makes sense that it can be configured in this way. However, the buildings and facilities that I am familiar with -working in- usually have 3 phase available at 240/415, or 230/400.

So my question is: in what parts of the world (or in what industries) have some of these alternative voltages? e.g. where do they use 3-phase at 380/660, or 400/690? Also where does 460 V come from?

Motor name plate

  • $\begingroup$ Have you considered how you measure the voltage? max value or rms? $\endgroup$
    – Solar Mike
    Jul 20 at 5:51
  • $\begingroup$ @SolarMike I haven't considered that. How do you think that affects things? $\endgroup$
    – hamslice
    Jul 20 at 7:09


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