What is the voltage threshold above which medium- and high-voltage cables are generally required to be shielded?

Medium- and high-voltage cables are generally required to be shielded at voltages above 2000 volts. This is primarily due to the need to manage electromagnetic interference (EMI) and maintain safety standards. Shielding helps to contain the electric fields generated by the cable, which is particularly important in environments where multiple cables may be running in close proximity or where sensitive electronic equipment is in operation. By ensuring that the cables are shielded, the risk of electrical arcing and voltage leakage is significantly reduced, making it safer for both personnel and equipment in the vicinity.

The requirement for shielding at this voltage threshold aligns with various safety standards and practices in the industry, which emphasize the importance of effective shielding in reducing potential hazards associated with high-voltage operations.