NEC Commercial Electrical Practice Test

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Prepare for the NEC Commercial Electrical Test with multiple choice questions each with detailed explanations. Study efficiently to excel in your exam!

Practice this question and more.

Nonmetallic-sheathed cable must be secured at intervals not exceeding how many feet?

5 feet
4 1/2 feet
3 feet
6 feet

The correct answer is: 4 1/2 feet

Nonmetallic-sheathed cable, commonly referred to as NM cable, must be secured at intervals not exceeding 4 1/2 feet in residential and commercial applications according to the National Electrical Code (NEC). This requirement is in place to ensure the safety and stability of the wiring system. Proper securing of these cables prevents movement, which could lead to insulation wear over time, reducing the risk of electrical shorts and potentially hazardous situations. The 4 1/2 feet standard is crucial not only for maintaining the integrity of the cable but also for ensuring compliance with local and national electrical codes, which prioritize safe installation practices. Any deviation from this prescribed distance can result in non-compliance with the NEC, leading to potential hazards and costly code violations.