To clarify...
240VAC is the nominal DELIVERED voltage
230VAC is the nominal AVAILABLE voltage at the motor
208VAC is the nominal DELIVERED voltage ( 208Y120 )
200VAC is the nominal AVAILABLE voltage at the motor
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You will see a CONSTANT stream of cross confusion ...
240/208 is the same as 230/200
One is the nominal voltage supplied
The other is the nominal voltage available at the pecker head / motor tap.
I hope this helps the apprentices.
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A 230 VAC motor is ASSUMED to connect to 240 VAC supply....
A 200 VAC motor is ASSUMED to connect to 208 VAC supply.
ALL voltages are NOMINAL ... and change with loading.
A TOTALLY unloaded motor will climb up the voltage towards parity.
I.E. no load voltages = supplied voltages.
HUGELY stressing motors draw down the local voltage -- and pull in current like crazy.
Until their 'heaters' pop.
This is when the draw is so huge that the windings are in danger.
Heaters are ANALOGS to the dynamics of the motor.
They are specifically engineered to 'pop' BEFORE the windings are damaged.
I'd NEVER install a motor without such thermal protection.
MOST 'small' ( less than one horse-power ) motors have INTEGRAL thermal protection.
Note this when you're planning HVAC disconnects....
MANY small units need only a motor rated switch... !
The cost savings can be DRASTIC...
I was a foreman for a top 25 contractor.
They changed their disco procedure AFTER my re-analysis.
They cut their costs 60% at a stroke.
Such savings infuriated my boss.
So much for perfection.
