Oklahoma Electrical Practice Exam

What is the smallest working depth required for a 24-volt system?

1. 1 foot

2. 2 feet

3. 3 feet

4. 4 feet

The correct answer is: 3 feet

In the context of low-voltage electrical systems, the depth at which a 24-volt system can be safely installed is crucial for ensuring proper operation and minimizing safety risks. For a 24-volt system, the National Electrical Code (NEC) typically requires a minimum burial depth of 3 feet when using nonmetallic conduits. This depth helps protect the wiring from physical damage and environmental factors while maintaining safety standards. Additionally, this depth consideration is particularly pertinent when discussing the placement of conductors in areas where there could be human interaction, such as in gardens or near children’s play areas. Thus, complying with this requirement minimizes the hazard of accidental contact or damage to the wiring. In summary, the choice reflects industry practices that prioritize safety for lower-voltage installations, ensuring that these systems are protected appropriately below the surface.