Washington Administrative Code(WAC) and Revised Code of Washington (RCW) Electrical Practice Exam

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How far must conductors extend from all mastheads?

12 inches
18 inches
24 inches
36 inches

The correct answer is: 18 inches

The requirement for conductors to extend a minimum of 18 inches from all mastheads is primarily based on safety and functionality considerations outlined in the National Electrical Code (NEC) as well as local amendments in Washington State. This ensures that there is adequate clearance for any potential connections to the service equipment while also allowing for proper weather protection and accessibility for maintenance. Extending conductors this distance helps prevent accidental contact with roofs, ladders, or other objects that could cause mishaps or electrical hazards. Furthermore, this measure can be vital for reducing strain on the conductor from weather elements, thereby extending its longevity. In contrast, the other distances provided (12 inches, 24 inches, and 36 inches) do not align with the established requirement for conductors to maintain safety and operational efficiency. Maintaining the specific 18-inch distance is crucial for ensuring compliance with electrical codes and for safeguarding both the electrical system and personnel working in proximity to these installations.