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?
What does a standard breaker protect?
What type of box is required for ceiling fans?
Fan-rated box
Gravity and constant movement increase stress
Where does every branch circuit begin?
What NM cable size is typically used for 20-amp residential circuits?
12/2
To contain and protect splices
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
For inspection and future repairs
What is the danger of overcrowding a junction box?
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?
What can happen if a fan is mounted to a light-only box?
Why are loads spread across multiple circuits?
Why are loads spread across multiple circuits?
Why is NM cable not allowed to be left exposed in certain locations?
Why is NM cable not allowed to be left exposed in certain locations?
Heat buildup and damaged insulation
Why are pigtails used when connecting devices?
What type of hazard does an AFCI protect against?
What type of hazard does an AFCI protect against?
What should you assume if a ceiling box is not labeled fan-rated?
What should you assume if a ceiling box is not labeled fan-rated?
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
To maintain continuity and grounding
Why do inspectors open junction boxes during inspections?
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?
Why do overhead loads require extra planning compared to wall devices?
What problem does poor home run routing create later?
Difficult troubleshooting and messy panels