What is a required condition for lead-in conductors at transmitting stations?

The requirement for lead-in conductors at transmitting stations to be grounded is essential for several reasons. Grounding these conductors helps to ensure safety by providing a path for fault currents, protecting both the equipment and personnel from electrical hazards. It also mitigates the risk of electrical interference that could affect the performance of the transmitting equipment, as grounding helps to stabilize the electrical environment.

Grounding plays a critical role in lightning protection as well, redirecting surge currents safely into the ground rather than allowing them to travel through the equipment. This protective measure is vital in transmitting stations, which are often exposed to lightning and other transient voltages.

In contrast, while insulation and bonding have their importance in preventing electrical shock and creating a safe, continuous electrical connection, they do not address the same grounding concerns that lead-in conductors specifically need to meet at transmitting stations. Additionally, the requirement for placing conductors underground is a separate consideration, primarily related to physical protection from environmental factors rather than electrical safety and performance.