What is the purpose of the LH ISOL and RH ISOL switches?

The LH ISOL and RH ISOL switches are designed to isolate the respective left-hand essential (LH ESS) and right-hand essential (RH ESS) buses in the electrical system of the Falcon 7X. The primary purpose of isolating these buses is to enhance safety and ensure that a failure in one side does not affect the other side of the electrical system. By isolating the buses, the crew can manage electrical loads more effectively and maintain critical systems operationally when one side experiences an issue.

In contrast, the other options do not accurately represent the function of these switches. They do not supply power to avionics equipment, connect to external lighting systems, or control the fire extinguishing system. Each of those functions is managed by different systems or switches within the aircraft's design.