Master Electrician Practice Exam

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What is the minimum burial depth for direct-buried cables rated at 13,000 volts?

  1. 18 inches

  2. 24 inches

  3. 30 inches

  4. 36 inches

The correct answer is: 30 inches

For direct-buried cables rated at 13,000 volts, the National Electrical Code (NEC) specifies a minimum burial depth of 30 inches. This depth is essential to ensure the safety and protection of the cable from physical damage and environmental factors. Cables operating at higher voltages require greater burial depths to minimize the risk of accidental contact and to reduce the potential for electrical hazards. Additionally, a deeper burial provides protection from the effects of soil movement and other disturbances. By adhering to this requirement, electricians ensure that the installation meets safety standards and provides reliable performance over the lifespan of the cable.

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