Both systems are radial, and voltages and power carrying capabilities are similar. Figure 1 compares the two systems. Relative to North American designs, European systems have larger transformers and more. For both forms, hardware is much the same: conductors, cables, insulators, surge arresters, regulators, and transformers are very similar. The main differences are in layouts, configurations, and applications. In fact, the distribution systems around the world have converged into two main designs: North American and European. For both. Whether in your own home, in a rented apartment or in a business, the distribution box is a central element of every electrical system.