NEC Commercial Electrical Practice Test

Which action regarding flexible cords and cables is prohibited?

1. They shall be anchored

2. They may be run through walls

3. They shall not run through holes in walls

4. They must be tested for endurance

The correct answer is: They shall not run through holes in walls

The prohibition regarding flexible cords and cables is rooted in safety standards and regulations designed to prevent hazards such as electrical shock, fire, or damage to the cable itself. When flexible cords and cables run through holes in walls, they become susceptible to physical damage from structural components or materials within the wall. This can create a breach in the insulation that protects against electrical hazards. Additionally, flexible cords are intended for portable applications and temporary installations. Running them through walls undermines their intended use and potentially creates a hidden danger that can go undetected, such as overheating or creating short circuits if the cords become pinched or compromised. In contrast, anchoring flexible cords is a safety measure that ensures they are secured properly, preventing tripping hazards or strain on connections. Running them through walls is generally allowed only under specific conditions that involve proper conduit or raceway, while testing for endurance is a best practice but not a prohibition. Thus, the practice of running flexible cords through holes is explicitly prohibited to maintain safe and compliant installations according to the NEC guidelines.