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What Is NM-B Cable (Romex)?

  • Writer: Jonathan Moreau
    Jonathan Moreau
  • Jan 10
  • 1 min read

Breaker BootCamp Study Guide


NM-B cable is a nonmetallic sheathed cable used for interior residential wiring.


It is designed for dry locations only.





What It Does



NM-B cable groups insulated conductors and a grounding conductor inside a protective jacket for branch circuits.





Where It’s Used



  • Walls, ceilings, and floors

  • Dry, concealed residential spaces






One Critical Rule



NM-B cable is not allowed in wet, damp, exposed, or outdoor locations.


If it can be damaged, NM-B is the wrong wiring method.





Why Breaker BootCamp Teaches This



The Breaker BootCamp Study Guide teaches wiring method selection early so the Breaker BootCamp course avoids failed inspections, damaged cable, and improper installs.





About Breaker BootCamp



Breaker BootCamp is an electrical training program and electrician boot camp designed to prepare beginners, helpers, and apprentices for real-world electrical work, job readiness, and long-term careers in the electrical trade.


 
 
 

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