Is it permissible to run a Vertical conduit through a horizontal cable tray?

Yes, it is permissible to run a vertical conduit through a horizontal cable tray, provided that it complies with relevant codes and standards, such as the National Electrical Code (NEC) in the United States. The installation must ensure that the integrity of the cable tray is maintained, any potential for physical damage is minimized, and proper clearances and support requirements are followed. Additionally, it is important to ensure that any necessary fittings or seals are used to maintain the system's integrity and safety.