ICC Residential Electrical Inspectors Practice Exam – Prep, Practice Test & Study Guide

Nonmetallic sheathed cable, commonly referred to as NM cable or Romex, must be installed in a way that ensures safety and compliance with electrical codes. The correct approach requires securing the cable to the building structure and providing protection from potential physical damage.

When NM cable is properly secured, it minimizes the risk of mechanical strain that can lead to damage over time, such as abrasion of the insulation or disconnections at junction points. This secure installation typically involves using staples, straps, or other approved methods to attach the cable to framing members, ensuring that cables remain in place and are not at risk of being inadvertently pulled or damaged.

Additionally, protecting nonmetallic sheathed cable from physical damage is crucial in environments where it might be exposed to impact or abrasion. This can include areas near doorways or where it might come into contact with other elements. The National Electrical Code outlines specific regulations on how and where NM cable should be run, including the requirement for it to be installed in a manner that prevents damage and maintains safety.

Loosely attaching the cable or not securing it at all would not meet these safety standards and could create hazards that might lead to electrical failures or fires. Therefore, the requirement to secure and protect the cable is essential for electrical