Electrical Inspector {National Electrical Code} Competency Study Guide Comprehensive Resource To Help You Ace Exams Includes Frequently Tested Questions With ELABORATED 100% Correct COMPLETE SOLUTIONS Guaranteed Pass First Attempt!! Curr

Electrical Inspector {National Electrical Code}

Competency Study Guide

Comprehensive Resource To Help You Ace 2026-2027 Exams
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS

Guaranteed Pass First Attempt!! Current Update!!


1. Overcurrent protection for size 18 AWG non-power-limited fire alarm (NPLFA) circuit
conductors shall NOT exceed ____ and the overcurrent protection for size 16 AWG NPFLA circuit
conductors shall NOT exceed ____.

A. 8 amperes, 10 amperes

B. 7 amperes, 12 amperes

C. 8 amperes, 12 amperes

D. 7 amperes, 10 amperes - Correct Answer: D. 7 amperes, 10 amperes



2. The general rule is where raceways and cables are exposed to direct sunlight on or above
rooftops, and the distance above the roof to the bottom of the raceway or cable is less than 7/8
in., a temperature adder of 33 deg. C (60 deg. F) shall be added to the outdoor temperature to
determine the applicable ambient temperature for applications of the correction factors. An
exception to this rule is ____.

A. Prohibited

B. Where the raceway or cables contain 3 or less current-carrying conductors

C. Where the insulated conductors or cables have a temperature rating of 90 deg. C or more

D. Where the insulated conductors or cables are Type XHHW-2 - Correct Answer: D. Where
the insulated conductors or cables are Type XHHW-2



3. An emergency system is required to have NO more than ____ to have power available in the
event of failure of the normal supply system.

,A. 10 seconds

B. 15 seconds

C. 60 seconds

D. 3 minutes - Correct Answer: A. 10 seconds



4. X-ray equipment installed in a hospital may be served by a hard-service cord with a suitable
attachment plug, provided the branch circuit rating does NOT exceed ____.

A. 15 amperes

B. 20 amperes

C. 30 amperes

D. 50 amperes - Correct Answer: C. 30 amperes



5. Elevator driving motors used with a generator field control are rated as ____ duty motors.

A. Intermittent

B. Continuous

C. Variable

D. Controlled - Correct Answer: A. Intermittent



6. Where a direct burial cable has a voltage of 45 kV, the NEC mandates the MIN. burial depth or
the cable to be at LEAST ____.

A. 24 inches

B. 36 inches

C. 42 inches

D. 48 inches - Correct Answer: C. 42 inches

,7. Given: A recreational vehicle campground has a total of 150 RV campsites with electrical
power. Twenty-five (25) of the campsites are reserved as tent sites. How many sites are required
to have at LEAST one (1) 20-ampere, 125-volt receptacle outlet.

A. 105

B. 125

C. 150

D. None - Correct Answer: C. 150



8. Determine the MIN. size type SO cord permitted to supply a 40 hp, 460-volt, 3-phase,
continuous-duty, ac wound rotor, motor installed in an area with an ambient temperature of 86
degrees F.

A. 2 AWG

B. 4 AWG

C. 6 AWG

D. 8 AWG - Correct Answer: A. 2 AWG



9. Where a 30 hp, 240-volt, 3-phase synchronous motor has a power factor of 90 percent, as per
the NEC the full-load running current of the motor is ____.

A. 63.0 amperes

B. 69.3 amperes

C. 76.23 amperes

D. 86.62 amperes - Correct Answer: B. 69.3 amperes



10. When water reaches the height of the established electrical datum plane for an irrigation
pond, the on land electrical service equipment must ____.

A. Be installed in a NEMA 6 enclosure

B. Float

C. Be installed in a NEMA 6P enclosure

, D. Disconnect - Correct Answer: D. Disconnect



11. Disregarding exceptions, when installing emergency battery pack lighting unit equipment,
the branch-circuit feeding this equipment shall:

A. Be connected to the nearest receptacle outlet.

B. Come from the closest outlet of power that is compatible with the emergency lights rated
voltage.

C. Be fed only from an identified emergency lighting panel.

D. Be on the same branch-circuit serving the normal lighting in the area. - Correct Answer:
D. Be on the same branch-circuit serving the normal lighting in the area



12. In an industrial establishment, what is the MAX. length of 200 ampere rated busway that
may be tapped to a 600 ampere rated busway without providing additional overcurrent
protection?

A. 10 feet

B. 25 feet

C. 50 feet

D. 75 feet - Correct Answer: C. 50 feet



13. Size 4/0 AWG, 75 deg. C aluminum secondary conductors of a 3-phase delta-wye
transformer, shall be protected at NOT more than ____.

A. 175 amperes

B. 200 amperes

C. The calculated load connected to the transformer

D. None of these, because secondary protections is not required for multiphase, delta-wye
transformer secondary conductors - Correct Answer: B. 200 amperes