What is the minimum size (3 wire + ground) SO cord that could be used as a flexible connection for the motor supplied from a 120/240-volt, 3Ø, 4-wire panelboard?

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What is the minimum size (3 wire + ground) SO cord that could be used as a flexible connection for the motor supplied from a 120/240-volt, 3Ø, 4-wire panelboard?

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