NEC NAVIGATION
Which NEC chapters apply to all electrical installations unless modified?
Chapters 1 through 4 📘 NEC 90.3
What table is used to determine allowable ampacity of insulated conductors?
Table 310.15(B)(16)
📘 NEC 310.15(B)(16)
What NEC article covers overcurrent protection?
Article 240
📘 NEC Article 240
What NEC article governs grounding and bonding?
Article 250
📘 NEC Article 250
How many volt-amperes are calculated per general-use receptacle?
180 VA
📘 NEC 220.14(I)
Where are definitions of NEC terms located?
: Article 100
What conductor temperature rating is normally used for circuits 100A or less unless otherwise marked?
60°C
📘 NEC 110.14(C)(1)(a)
What is the maximum standard breaker size for a #12 copper conductor?
20 amperes
📘 NEC 240.4(D)(5)
What is the purpose of bonding?
To establish an effective ground-fault current path
📘 NEC 250.4(A)(5)
What is the general lighting load per square foot for a dwelling unit?
3 VA per square foot
📘 NEC 220.12
Which chapter contains special occupancies such as hazardous locations and health care facilities?
Chapter 5
📘 NEC 90.3
What adjustment factor applies when 4–6 current-carrying conductors are in a raceway?
80%
📘 NEC 310.15(B)(3)(a)
When conductor ampacity does not match a standard OCPD size, what rule allows rounding up?
Next higher standard rating
📘 NEC 240.4(B)
What table is used to size equipment grounding conductors?
Table 250.122
📘 NEC Table 250.122
What demand factor applies to the first 3,000 VA of dwelling lighting load?
100%
📘 NEC 220.42
Which NEC article covers grounding and bonding requirements?
Article 250
📘 NEC Article 250
After adjustment and correction factors are applied, the conductor ampacity shall not be less than what value?
The load served
📘 NEC 310.15(A)(2)
Overcurrent devices shall not be installed where ambient temperature exceeds what value unless listed for the condition?
40°C (104°F)
📘 NEC 240.6
What electrode is required at every building supplied by a feeder or service?
Grounding electrode system
📘 NEC 250.50
What percentage is used for continuous loads when sizing conductors and OCPD?
125%
📘 NEC 210.20(A), 215.3
Q: Which NEC chapter contains communications systems and does not generally apply to power wiring rules?
Chapter 8
📘 NEC 90.3
A #12 THHN conductor at 90°C is adjusted for 6 current-carrying conductors. What is the adjusted ampacity before termination limits?
30A × 80% = 24A
📘 NEC 310.15(B)(16), 310.15(B)(3)(a)
A 65A calculated load is served by a conductor rated 70A. What is the maximum breaker allowed?
70 amperes
📘 NEC 240.4(B), 240.6
What is the minimum size copper grounding electrode conductor to a single rod electrode?
#6 AWG copper
📘 NEC 250.66(A)
A 240V motor draws 28A continuous. What is the minimum conductor ampacity required?
35 amperes
📘 NEC 430.22(A)