Some Differences Between United States and Foreign Industrial Control Apparatus and Standards

The major differences between U.S. and foreign industrial control apparatus arise from differences in national standards. Some of these are a result of different electrical systems, and others because of different installation and service requirements. There are only minor differences between national standards of European nations for industrial control apparatus where such standards exist. The IEC recommendations are being generally adopted by most foreign nations, and while they have not yet been incorporated in U.S. standards, they will have a strong influence in the future.