National Electrical Code (NEC) NFPA
70 Exam 2025 Questions and Answers
NEC Article 100 - ANSWER✔✔-Definitions
NEC Article 110 - ANSWER✔✔-Requirements for electrical installs
NEC Section 110.14(c) - ANSWER✔✔-temperature limitations for wire sizing. *DO NOT exceed
lowest temperature rating*
NEC Section 110.21(B) - ANSWER✔✔-required hazard markings, labels, and placards
NEC Section 110.26(A)(1) - ANSWER✔✔-table of working spaces, depends on working conditions
NEC Section 110.28 - ANSWER✔✔-Enclosure selections (table)
NEC Chapter 2 - ANSWER✔✔-wiring and protection
NEC Article 200 - ANSWER✔✔-grounded conductors
NEC Article 230 - ANSWER✔✔-services (where the utility serves you your electricity)
NEC Article 240 - ANSWER✔✔-overcurrent protection devices (OCPDs)
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
, NEC Section 240.4(D) - ANSWER✔✔-small conductor rule. lower limit to size of conductors
based on OCPD. size for small conductors.
NEC Article 250 - ANSWER✔✔-grounding and bonding
NEC Section 250.52 - ANSWER✔✔-electrodes (i.e. ground rods, rings, water pipes, concrete
encased) - connections to the earth
NEC Section 250.66 - ANSWER✔✔-alternating current (AC) grounding electrode conductor
(GEC) (attached to electrode)
NEC Section 250.122 - ANSWER✔✔-equipment grounding conductor (both AC/DC)
NEC Section 250.166 - ANSWER✔✔-size of direct current grounding electrode conductor
NEC Chapter 3 - ANSWER✔✔-wiring methods and materials
NEC Article 300 - ANSWER✔✔-general requirements for wiring methods and materials
NEC Section 300.5 - ANSWER✔✔-underground installations - information on how deep to bury
conduit (table)
NEC Section 300.7 - ANSWER✔✔-raceways expsoed to different temperatures
(A) proper sealing
(B) account for expansion
NEC Article 310 - ANSWER✔✔-conductors for general wiring
NEC Article 314 - ANSWER✔✔-junction boxes, enclosures, and outlets
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
70 Exam 2025 Questions and Answers
NEC Article 100 - ANSWER✔✔-Definitions
NEC Article 110 - ANSWER✔✔-Requirements for electrical installs
NEC Section 110.14(c) - ANSWER✔✔-temperature limitations for wire sizing. *DO NOT exceed
lowest temperature rating*
NEC Section 110.21(B) - ANSWER✔✔-required hazard markings, labels, and placards
NEC Section 110.26(A)(1) - ANSWER✔✔-table of working spaces, depends on working conditions
NEC Section 110.28 - ANSWER✔✔-Enclosure selections (table)
NEC Chapter 2 - ANSWER✔✔-wiring and protection
NEC Article 200 - ANSWER✔✔-grounded conductors
NEC Article 230 - ANSWER✔✔-services (where the utility serves you your electricity)
NEC Article 240 - ANSWER✔✔-overcurrent protection devices (OCPDs)
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
, NEC Section 240.4(D) - ANSWER✔✔-small conductor rule. lower limit to size of conductors
based on OCPD. size for small conductors.
NEC Article 250 - ANSWER✔✔-grounding and bonding
NEC Section 250.52 - ANSWER✔✔-electrodes (i.e. ground rods, rings, water pipes, concrete
encased) - connections to the earth
NEC Section 250.66 - ANSWER✔✔-alternating current (AC) grounding electrode conductor
(GEC) (attached to electrode)
NEC Section 250.122 - ANSWER✔✔-equipment grounding conductor (both AC/DC)
NEC Section 250.166 - ANSWER✔✔-size of direct current grounding electrode conductor
NEC Chapter 3 - ANSWER✔✔-wiring methods and materials
NEC Article 300 - ANSWER✔✔-general requirements for wiring methods and materials
NEC Section 300.5 - ANSWER✔✔-underground installations - information on how deep to bury
conduit (table)
NEC Section 300.7 - ANSWER✔✔-raceways expsoed to different temperatures
(A) proper sealing
(B) account for expansion
NEC Article 310 - ANSWER✔✔-conductors for general wiring
NEC Article 314 - ANSWER✔✔-junction boxes, enclosures, and outlets
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
