Labelling is done in accordance with the standard SRPS N.A3.001-008 which complies with the standard of the International Electrotechnical Commission IEC 60617.Labelling items, components, equipment, switchyards, main distribution lines, subdivisions, etc. they are represented in the drawings by graphic symbols, the meaning of which is given in the appendix.The label is displayed in a convenient place near the graphic symbol of the element. The labels are aligned with the elements shown in the various drawings, the individual locations of the drawings, the descriptions of the circuit diagrams, and the instructions on the equipment.