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, the external conductor terminals must be separated from the functional units, but the external conductor connection points do not need to be separated among themselves. External conductor connection points must be in a separate compartment.

Form 3A : The supply terminals of the functional units and the external conductor terminals are inseparable.

Form 3B : The supply terminals of the functional units and the external conductor terminals are separated from each other.