What is the minimum number of wires needed between two start/stop push button controls?

The minimum number of wires needed between two start/stop push button controls is two. This configuration typically involves one wire for the start push button and one wire for the stop push button. When wired in a control circuit connected to a motor or other device, the start button is designed to initiate the operation while the stop button interrupts or halts the process.

By using two wires, you create a complete circuit that allows current to flow when the start button is pressed, activating the device. The stop button is generally wired in such a way that it is in series with the start button, meaning it will break the circuit when activated, thereby stopping the current and ceasing operation of the connected load.

Using just one wire would not allow for both functions to effectively operate, as each button requires a return path to complete the circuit. Increasing the number of wires beyond two would introduce unnecessary complexity for this specific scenario. Therefore, utilizing two wires fulfills the requirement for a basic start/stop control circuit.