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Question:

If a 230 volts load is connected to 240 volts power source, what is the minimum voltage that can be supplied to load as recommended by NEC?

A 228 volts
Explaination

NEC recommends the maximum voltage drop should be less than 5% for both branch circuit and feeder.
5% drop = 240 x 0.05 = 12 volts
The minimum voltage that can be supplied to load is 240 – 12 = 228 volts