What is the maximum size fuses that can be installed for a single-phase compressor with an RLC of 28.9 amps?

In determining the maximum size of fuses that can be installed for a single-phase compressor, you would typically refer to the National Electrical Code (NEC) guidelines, which provide a framework for safe electrical installations. For motors and compressors, especially those with a locked rotor current (RLC), fuse sizing is critical to ensure the protection of the equipment and prevent nuisance tripping.

According to NEC guidelines, when sizing fuses for motors, particularly single-phase compressors, the fuses should be rated at 125% of the full-load current for running conditions, but they can be rated at a higher percentage, such as 175% of the RLC, for short-duration overloads. In this case, with an RLC of 28.9 amps, the appropriate fuse size is calculated to be:

• For the maximum size, fuses can be calculated using the formula:

Maximum Fuse Size = RLC x 1.75

• This gives: 28.9 amps x 1.75 = 50.57 amps.

This indicates that the correct answer must meet the condition of being below or equal to the calculated amperage while also taking into consideration the next standard fuse size. The standard sizes for fuses following this