In general, the more twists per centimeter, the less sensitive the cable is to external fields. It is helpful if the insulation around each wire in the cable is colored differently, to make it easy to see which is which when attaching them to plugs, jacks and other terminations as the station is built. The cable's capacitance per centimeter should be as low as possible. When several cables link two areas of the studio, tape or tie them in bundles to prevent them from tangling. Audio cables carrying voltages that differ by more than 15 dB should not be bundled together.
Grounding lets unwanted currents drain to the earth.
It also provides a common voltage reference for circuits that need one. To avoid ground loops, the shield around each audio cable should be grounded only at one end. Advance planning and accurate diagrams are essential for both studio wiring and grounding systems. They will save huge amounts of time later when problems arise and everyone has forgotten details about the installation.