Maintenance and repair services of engineering communications
Maintenance and repair services of cold water, drinking water treatment plants, sewerage and rain sewerage systemMaintenance and repair services of cold water, drinking water treatment plants, sewerage and rain sewerage system
Maintenance and repair services of the hot water and heating systemMaintenance and repair services of the hot water and heating system
Maintenance and repair services of ventilation and air-conditioning systemMaintenance and repair services of ventilation and air-conditioning system
Low-voltage systems – security alarm system (AS), video surveillance system (VS), access control system (PC) maintenance and repair servicesLow-voltage systems – security alarm system (AS), video surveillance system (VS), access control system (PC) maintenance and repair services
Maintenance and repair services of the power supply systemMaintenance and repair services of the power supply system
Maintenance and repair services of lifts and emergency servicesMaintenance and repair services of lifts and emergency services