A 3Ø piece of equipment has a nameplate rating of 54 amps at 240 volts 3-phase. What is the smallest AWG cord suitable for connection?

To determine the smallest AWG cord suitable for connecting a 3-phase piece of equipment rated at 54 amps, we need to consider both the ampacity of the wire and the allowable voltage drop. When dealing with high currents, such as 54 amps, it is critical to select a wire that can handle the load without overheating, ensures safety, and complies with the National Electrical Code (NEC) standards.

For a rating of 54 amps, the NEC provides ampacity tables that indicate the appropriate wire sizes based on the maximum current they can carry continuously. Generally, a 4 AWG copper wire is rated for up to 70 amps, making it more than capable of handling the 54-amp load without risk. This size also minimizes voltage drop over longer distances, enhancing the efficiency of the equipment.

Selecting a smaller wire, such as 10, 12, or 14 AWG, would not provide adequate capacity and could lead to overheating and potential hazards. Therefore, 4 AWG is the most suitable choice, ensuring compliance with safety standards while effectively supplying the required electrical load to the equipment.