Final answer:
The neutral wire, commonly white, connects to the wide blade of a polarized 2-prong plug, while the live/hot wire connects to the narrow blade.
Step-by-step explanation:
When wiring a polarized 2-prong plug, the neutral wire connects to the wide blade. The neutral wire is usually identified by its white or light-colored insulation and is considered the return path for current, making it safe even if the insulation is missing. In contrast, the other wire, known as the 'live/hot' wire, carries power to the appliance and is connected to the narrow blade. It is important to follow local electrical codes and standards, as the color-coding of wires may vary by region.