7. the installation of electrical systems in high-voltage and low-voltage systems such as the various pipe, 220, each type of cables, which have a AC-main 380 V on both the pipe and copper wiring.
7th. Aspects of electrical installation. Both low voltage and high voltage systems, such as 220, different pipe, wires, each of which has a 380 V AC-main as well as in the copper piping and wiring as well.
7. The installation of electrical systems. The high / low voltage, such as in 220 piping system, various each kind, the use of lines, which have AC-main. A system 380 V. Both in the piping and wiring copper as well.