A factor of extreme relevance that must be considered refers to the fact that by means of the norms, the maneuver circuits are divided into command and power, allowing the safety of the operator and secondly the automation of the circuit. As it does not seem, this division until then, become common as the circuits are being executed. When it comes to the process of connecting an engine, the first element that comes to mind is that of a wrench to power it. However, in the case of electric commands, https://www.mrosupply.com/motors/2841131_00536os1dcd56h-s_weg/ this switch that connects the motors is different from a common key to those used to control light bulbs, for example.
Briefly, in the same way, that in order to replace a simple flat tire of any automobile, it is necessary to know the appropriate tools to be used to remedy such problem. If it is a question of electrical commands, in order to understand the operation of a circuit, and then to design it, it is necessary to know the proper elements in depth. The difference is in the fact that in large panels they are equipped with high capacity buses that can subject the people involved to risk situations.