If you refer to Table 11 of the same manual that gives the maximum length of wire you can use to keep voltage drop under 5%, you’ll either need to use a 14 AWG copper wire or a 12 gauge one if your distance is either 190 or 310 feet, respectively. On the other hand, a 3/4 hp pump with the same motor type and voltage needs a 20 amp breaker. Based on Table 14 in the Franklin manual and since you’re likely asking about the breaker size for the 230v well pump, you’ll need to use a 30 amp circuit breaker for it, not considering the distance. Let’s assume you use a 1.5 HP pump with a single-phase motor. Even if we compare these tables to the one recommended by the NEC, you’ll see that they don’t really depart that much and even make it clear that they use its guidelines as a reference. It provides detailed instructions not only on breaker sizing and wire sizing but also considers distance, temperature, connection type (whether it’s single-phase or three-phase), starting amperage, and voltage drop. Just ask a lot of well pump installers in your area, and they’ll likely say they consult manuals such as this one created by Franklin. Well pumps, especially submersible pumps, are not your standard motors and often require specialized overload protection. Why It’s Ideal to Stick to Manufacturer Requirements Why is It Important to Choose the Correct Size Breaker for a Well Pump?.How to Size a Circuit Breaker for a Pump?.What If The Manufacturer supplies no Clear Information?.
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