Door interlocking application example according to U.S. standards

To protect persons from injuries caused by electricity, control panels that are used in the U.S. must be designed so that they ensure protection against direct contact. This means that no live parts can be touched under normal operating conditions. The U.S. standards therefore specify that the enclosure doors must be locked in accordance with specific guidelines, but that they must be accessible for maintenance and service by qualified personnel


In this application example we show how to comply with the requirements of the U.S. standards for mechanical/electronic door interlocks with a LOGO! controller for distributed control panels with any number of doors, while at the same time saving efforts and costs.