Each conductor that leads underground and is exposed to lightning must have what installed within 100 feet of the entry point?

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The requirement for having a lightning arrestor of an approved type installed within 100 feet of the entry point for any conductor that leads underground and is exposed to lightning stems from the need to protect electrical systems and equipment from the destructive effects of lightning strikes. Lightning arrestors serve as safety devices that divert lightning strikes away from sensitive infrastructure, thereby preventing electrical surges and potential fire hazards.

In the context of underground mining operations, where safety and operational integrity are paramount, the installation of a lightning arrestor becomes crucial. These devices are specifically designed to mitigate the risk of electrical surges by redirecting excess energy safely into the ground. This not only protects the conductors but also ensures that the mine's electrical systems remain functional and safe during thunderstorms.

The other choices, while relevant to electrical safety, do not provide the specific protection against lightning surges that an approved lightning arrestor does. Circuit breakers and surge protectors are useful in different contexts but do not serve the same primary purpose of directly addressing lightning strikes as effectively as a properly installed lightning arrestor. A backup generator, while important for maintaining power, does not relate directly to lightning protection. Thus, a lightning arrestor is the correct choice for this scenario.

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