This technical report recommends the procedures to assess the disturbance levels produced by the emission of the devices, equipment and systems installed in non-public networks in industrial environment as far as the low-frequency conducted disturbances in the power supply are concerned; on this basis, the relevant emission limits can be derived. It applies to low and medium voltage a.c. non-public supply at 50/60 Hz. Networks for ships, aircraft, off-shore platforms, and railways are out of the scope of this report. This technical report deals with the low-frequency conducted disturbances emitted by equipment connected to the power supply. The disturbances considered are: • harmonics and interharmonics; • unbalances; • voltage changes; • voltage dips.