Answer: Yes; cables are tied down in cable trays to keep the cables in the cable tray, to maintain spacing between cables, or to segregate or confine certain types of cables to specific locations. The last two items can also be accomplished with a solid fixed barrier. In industrial settings, electrical and instrumentation (E&I) cable trays or bridge racks play a critical role in organizing and supporting power, control, and signal cables across facilities. An effective layout ensures safety, minimizes interference, reduces maintenance time, and keeps the overall. There are really two considerations insulation failure /damage- what sort if cable is the UTP (would the jacket of the lower rated cable hold off mains voltages ) if so then they could be as close as you like,otherwise it should be segragated by split duct or similar. 20 (A) is pretty generic in stating that all multiconductor cables operating at 1000V or less can be installed in the same tray. However, exceptions exist where co-location is necessary, such as within a junction box where a low-voltage thermostat wire connects to a. Standards and Rules are provided to maximize a minimum distance between communication and power cables.
