What is the smallest conductor size permitted between the gutter and the switch for a 7.5 hp motor?

To determine the minimum conductor size permitted for a 7.5 hp motor, it's essential to consider the ampacity and the requirements set forth in the National Electrical Code (NEC). For a 7.5 hp motor, you generally need to find its full-load current, which typically falls around 15 to 20 amps depending on the voltage and phase of the motor.

For a conductor running between the gutter and the switch, the NEC specifies that conductors should be sized appropriately not only for the current but also for the length of the run and the type of insulation. In many applications, 8 AWG copper conductors can carry sufficient amperage for a 7.5 hp motor in normal conditions, making it a common choice.

This choice aligns with NEC requirements because it ensures that the conductor can safely handle the expected current without overheating, while also taking into account any additional considerations such as ambient temperature and conductor bundling.

Larger conductor sizes, such as 1/0 AWG, 6 AWG, or 3 AWG, are typically used for higher power applications or longer distances, where voltage drop needs to be minimized or where higher current ratings are required. However, for a standard installation involving a 7.