The subject is based on the requirements of designers for solving electrodynamic phenomena especially in heavy current electrical engineering. These problems were consulted with workers from various industrial companies and also based on the experience of the teacher in his design work at the project company ENERGOPROJEKT. The subject deals with the power effect of the electric field (separators, limitation of static electricity in the operations) and mainly with force effect of magnetism (forces in switchboards and switchboards, forces between busbars, interaction of cable distribution forces, etc.). An integral part consists of calculations of conduction capacities of various configurations, calculations of inductances of electrical devices, calculations of current conduction parts in dependence on frequency (skinefekt) and conduction of insulating elements. The course introduces students to the issue of electromagnetic compatibility in relation to radiated and received interfering energy.