This standard BS EN IEC 60375:2018 Conventions concerning electric circuits is classified in these ICS categories:
01.080.40 Graphical symbols for use on electrical and electronics engineering drawings, diagrams, charts and in relevant technical product documentation
01.060 Quantities and units
17.220.01 Electricity. Magnetism. General aspects
IEC 60375:2018 specifies the rules for signs and reference directions and reference polarities for electric currents and voltages in electric networks.