Can a 380V 3 phase 50Hz electrical motor run safely on a 415V 3 phase 50Hz supply?

If a +/- 10% service voltage variation is allowed then the 380 volts RMS "nominal" voltage could in fact vary between 342 volts and 418 volts.

Whether or not it would be safe to run a 3-phase motor, which was designed to run continuously on a 380V service, on a 415V service will depend on how closely the actual voltage which is being supplied stays to 415V because, allowing for a 10% variation either way, the actual service voltage could vary between 373.5 volts and 456.5 volts.

The lower voltage would be ok but the higher voltage would be too high such that there could be a risk of the motor overheating and/or catching on fire if the circuit breakers don't trip to shut off the current.

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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.