Electrical IBEW Practice Test 2025 - Free IBEW Practice Questions and Study Guide

Using non-metallic sheathed cable, commonly known as NM cable or Romex, presents certain potential issues, particularly its vulnerability to damage caused by moisture and physical threats. This type of cable is typically used in dry environments and is rated for indoor residential use. Exposure to moisture can lead to deterioration of the insulation and problems with the electrical conductivity, ultimately compromising the safety of the installation.

Physical threats, such as rodent damage or impact from tools and equipment, can also pose significant risks to non-metallic sheathed cables. Unlike their metal counterparts, which offer a layer of protection from such hazards, non-metallic sheathed cables are more susceptible to cuts and abrasions.

Understanding these factors is crucial for anyone considering the use of non-metallic sheathed cable in their electrical installations. It’s important to assess the environment where the cable will be installed and take necessary precautions, such as protecting the cable with conduits or placing it in areas where it is less likely to be exposed to moisture or physical damage.