NM CABLE & ROUTING
What does “NM” stand for in NM cable?
Non-Metallic
What is the main purpose of a junction box?
To contain and protect splices
What does a standard breaker protect?
The wire
What type of box is required for ceiling fans?
Fan-rated box
Where does every branch circuit begin?
The breaker panel
What NM cable size is typically used for 20-amp residential circuits?
12/2
Why must junction boxes remain accessible?
For inspection and future repairs
What type of hazard does a GFCI protect against?
Electric shock
Why are ceiling fans more dangerous than light fixtures?
They create vibration and movement
What is a home run?
The cable from the panel to the first device
Why must NM cable be stapled and secured in walls?
To prevent movement and physical damage
What is the danger of overcrowding a junction box?
Heat buildup and damaged insulation
How does a GFCI know when to trip?
It detects current imbalance
What can happen if a fan is mounted to a light-only box?
It may loosen or fall
Why are loads spread across multiple circuits?
To prevent overload and nuisance tripping
Why is NM cable not allowed to be left exposed in certain locations?
It can be damaged and is not protected
Why are pigtails used when connecting devices?
To maintain continuity and grounding
What type of hazard does an AFCI protect against?
Fire caused by arcing
What should you assume if a ceiling box is not labeled fan-rated?
It is not safe for fans
Why is breaker labeling important?
Safety and easier troubleshooting
What problem can occur if NM cable is routed poorly through a structure?
Physical damage, difficult troubleshooting, inspection failure
Why do inspectors open junction boxes during inspections?
To check splices, grounding, and box fill
Why might an AFCI trip even if there is no overload?
It detects dangerous arcing patterns
Why do overhead loads require extra planning compared to wall devices?
Gravity and constant movement increase stress
What problem does poor home run routing create later?
Difficult troubleshooting and messy panels