Filled Alpeth can only be direct buried where there is what risk level of damage from rodents and environmental hazards?

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Assessing where direct burial is appropriate depends on the level of risk from rodents and environmental hazards. If the path is considered low risk, a filled Alpeth can be direct buried because there’s little threat from gnawing or soil-related damage, and the protective materials and installation method can withstand that environment. In higher-risk conditions, direct burial would expose the installation to greater chances of failure, so alternative protection (such as conduit or additional shielding) would be required. Therefore, the correct condition is a low risk of damage from rodents and environmental hazards.