Journeyman Electrician Practice Exam

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Prepare for the Journeyman Electrician Exam. Test your skills with multiple-choice questions designed to help you succeed. Each question comes with hints and detailed explanations to assist in your study process.

Practice this question and more.

When a metal wireway has splices and taps, what is the maximum percentage of area that can be filled?

50 percent
60 percent
75 percent
85 percent

The correct answer is: 75 percent

The correct answer indicates that when a metal wireway contains splices and taps, the maximum percentage of area that can be filled is 75 percent. This guideline is rooted in the National Electrical Code (NEC), which establishes guidelines to ensure safe and reliable installations. The 75 percent fill limit accommodates not just the conductors but also any additional wiring space needed for splicing or tapping operations, ultimately reducing potential issues such as overheating and ensuring maintenance access. Filling the wireway to this level allows for adequate air circulation around the wires, thereby minimizing the risk of heat buildup. It also ensures that installers have sufficient space to work within the wireway without compromising the integrity or safety of the wiring system. This practice is particularly relevant in commercial or residential applications where numerous connections or transitions may be necessary. By adhering to this maximum fill percentage, electricians help maintain compliance with safety standards and promote longevity in the electrical systems they design and implement.