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The minimum cover required for rigid metal conduit that is directly buried outdoors is 6 inches. This specification is established to ensure that the conduit is sufficiently protected from physical damage due to surface activities and to maintain the integrity of the electrical wiring contained within it.

A cover of 6 inches is considered adequate for typical outdoor applications, allowing for normal soil movement and conditions without risking exposure of the conduit. This depth helps to prevent accidental damage from activities such as landscaping or construction, which could occur at shallower depths.

While other depths may seem like valid cover options for various circumstances, they do not align with the specified requirements for rigid metal conduit as set forth in electrical codes like the National Electrical Code (NEC). Therefore, the choice of 6 inches ensures adherence to safety guidelines and proper installation practices for outdoor electrical systems.