Metric Wire Gauge refers to a standardized system used to measure the diameter of electrical wires in millimeters. This system is commonly used in many countries around the world, especially in Europe, to ensure consistency in wire sizes for various applications, including electrical installations and manufacturing. The gauge number decreases as the wire diameter increases, meaning a lower gauge number indicates a thicker wire. For example, a 1.0 mm wire is thicker than a 0.5 mm wire. Understanding Metric Wire Gauge is essential for selecting the appropriate wire for specific electrical loads and ensuring safety in electrical systems.