Q. How do I size the conductors and protection device for a single motor? Find the Answer A. Conductors to a single motor must be sized not less than 125% of the motor FLC rating as listed in Table 430.247 [Direct-Current Motors], Table 430.248 [Single-Phase Motors], or Table 430.250 [3-Phase Motors (430.22)]. Let’s run through a simple example problem to show you how to make the calculation. Example: What size branch circuit conductor is required for a 7½-hp, ...

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