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Class 2 and Class 3 circuits are specifically regulated by the National Electrical Code (NEC) to ensure safety and reduce the risk of electrical hazards. These circuits often carry lower voltages and have specific installation requirements to protect against potential overcurrent situations and to maintain their integrity.

The correct answer highlights that Class 2 conductors should not be installed in enclosures with Class 1 conductors unless there is an adequate barrier separating them. This requirement ensures that the lower voltage Class 2 circuits do not inadvertently interact with the higher voltage Class 1 circuits, which could create safety risks, such as insulation breakdown or bridging faults. Proper separation helps minimize interference and maintains the safety standards that protect both personnel and equipment.

In contrast, conductors of Class 2, electric light conductors, and power conductors can be installed together under specific, regulated conditions, assuming that their voltage levels and other installation parameters are properly adhered to. The NEC provides these guidelines to promote safe wiring practices, and recognizing the rationale behind these separations is crucial for compliance and safety in electrical installations.