Design, calculation, construction, installation, testing, commissioning, maintenance and repair of: electrical equipment for the generation, distribution, conversion and supply of electrical energy, earth and lightning protection systems, antenna and satellite systems, etc. Call, signalling, alarm and monitoring systems, regulation and control systems, BUS, network, ISDN distribution systems as well as all category “0” systems, compensation systems, static and mechanical inverter systems, battery systems, direct current devices and systems, electrical energy consumption devices and electrical and electronic equipment.