Can I use a free NYM cable or control line for the dS 485 bus? digitalSTROM Support September 21, 2018 14:08 Updated Follow The dS485 bus requires two twisted wires for stable communication. A diameter of 0.6 - 0.8 mm is recommended. Related articles Which cable do you recommend according to VDE 0100-444 for the dS485 bus? Is the dS485 bus a SELV or PELV circuit? How are the dSMs and the dSS connected? What is the dSS20 for? Why are there only digitalSTROM meters dSM up to 16A?