NEIEP Mechanics Practice Exam

What is the minimum percentage of spare wires that should be pulled to the car or controller?

1. 5%

2. 10%

3. 15%

4. 20%

The correct answer is: 10%

The minimum percentage of spare wires that should be pulled to the car or controller is typically set at 10%. This guideline ensures that there is an adequate supply of spare conductors available for future repairs, modifications, or upgrades without needing to pull additional cables, which can save time and resources during maintenance. Having a sufficient percentage of spare wires is essential for ensuring reliability and flexibility in the system. In many cases, standards reflect not only the current needs but also potential future requirements that might arise due to system expansions or unforeseen issues. Other percentages might be lower or higher, but the 10% threshold is generally recognized as a practical compromise between having enough spare wire to address future needs while avoiding unnecessary costs and complications associated with pulling excess wire.