While applying the form separation process, metal or non-metal parts are used in order to prevent the transition between the sections. With using these parts, direct access of the user to live parts or materials such as circuit breakers is prevented. In practice, when the door is opened, we should not encounter an energized busbar. For the reliability of the compartments, they should be opened using a hand tool such as a key. In addition, the holes on the parts for which separation is provided must be large enough not to pass fingers.,

Separation of busbars and functional units, as well as the separation of functional units within themselves. In addition, external conductor terminals must also be separated from functional units, and external conductor connection points must be separated among themselves. External conductor connection points must be in a separate compartment.

Form 4A : The supply terminals of the functional units and the external conductor terminals are inseparable. External conductor terminals are separated among themselves

Form 4B : The supply terminals of the functional units and the external conductor terminals are separated from each other. External conductor terminals are separated among themselves.