Which of the following conditions allows high voltage mine cables to be exposed?

High voltage mine cables must be covered and insulated to ensure safety and prevent hazards in the mining environment. Proper insulation serves to protect both the cables and the workers from electrical shocks, short circuits, and other electrical hazards that could arise from exposed wiring. This covering acts as a barrier against moisture, dust, and mechanical damage, which is critical in the challenging conditions of a mine.

While having the cables installed in dry areas, checking them monthly, or placing them at a height of at least 8 feet may contribute to safety, none of these conditions alone provides the comprehensive protection that proper insulation and covering do. Therefore, the best practice is to have the cables covered and insulated to uphold safety standards in mining operations.