Direct burial cables rated above what voltage must be shielded?

Direct burial cables rated above 2000 V must be shielded to ensure safety and reduce the risk of electrical interference or faults. Shielding in electrical cables helps contain electromagnetic fields and provides insulation from external factors that might affect the performance of the cable or lead to safety hazards. For voltages exceeding this threshold, the shielding becomes crucial in both protecting the cable from external forces and minimizing the potential for dangerous arcing, which can occur when cables are not adequately shielded at high voltage levels. This requirement is often based on both industry standards and safety regulations designed to maintain safe working conditions and ensure reliable electric service.