What is the minimum permissible size for conductors when connecting multiple three-phase motors?

When connecting multiple three-phase motors, the minimum permissible size for conductors is determined by several factors such as the current ratings of the motors, the NEC (National Electrical Code) guidelines, and the specific application and local amendments.

Choosing a conductor size like 6 AWG ensures that the conductors can safely handle the load without overheating, taking into consideration the current carrying capacity, voltage drop, and any derating factors. Conductors that are too small may not only lead to increased heat generation, potentially damaging the insulation and conductors themselves, but also create safety hazards due to the risk of fire or failure under load.

It's essential to follow the NEC guidelines for the specific application, as motors can have varying starting and running currents that necessitate larger conductors to effectively manage these electrical demands. Ensuring that 6 AWG conductors are used provides an appropriate balance between safety and performance for standard installations involving multiple three-phase motors.