Electrical NCCER test Questions with
correct Answers 2025
In a guardrail system, the guardrails can be made of any of the following EXCEPT: -
ANSWER- ropebanding
If the potential across the circuit is 48 volts and the current is 5 amps the resistance of
the circuit is: - ANSWER- 9.6 ohms
A UL listed rod type grounding electrode must have a minimum length of: - ANSWER- 8'
What is the MINIMUM number of overload sensing units required for all three phase
motors? - ANSWER- 3
In a circuit of pure capacitance, the current leads the voltage by an angle of: -
ANSWER- 90-degrees
The standard unit for a measuring the cross-sectional area of a wire is the: - ANSWER-
circular mil
The drawing scale is MOST likely to be found in which of the following drawing
locations? - ANSWER- the drawing little block
The length of a bare copper conductor in a ground ring MUST be buried no less than
2.5' below grade and with a length of at least: - ANSWER- 20 ft.
When installing heating cables for anti-icing systems, cable patters should be in a: -
ANSWER- Serpentine
An auxiliary holding contact (seal-in) on a NEMA starter is indicated by the terminal
marking: - ANSWER- A1 & A2
The neutral bus in a sub panel: - ANSWER- is bonded
The PEAK voltage in a nominal 120/208 VAC system is: - ANSWER- 208V.
THWN conductors have an outer jacket made of: - ANSWER- nylon
What is shown on a sectional drawing? - ANSWER- Cutaway view of a building
, Who is allowed to remove another electrician's tag or lock from any valve, switch, or
piece of equipment without proper authorization? - ANSWER- no one.
The MAIN purpose of a revision block on an electrical drawing is to: - ANSWER- note
any changes to the original drawings
Which of the following is the classified location where combustible vapors are always
present? - ANSWER- class I Div I
With a row of 3-4" conduits and second row of 3-2" and 2-1" conduits for an angle pull
box what is the MINIMUM distance between the opposite walls of the pull box? -
ANSWER- 32"
Exposed field-routed electrical conduit SHOULD be installed so that it: - ANSWER- is
plumb and level
When wiring control push button control circuit, the auxiliary holding contact (seal-in) is
wired with the start button in: - ANSWER- parallel
Ferrous metal raceways, boxes, fittings, and supports must be protected against: -
ANSWER- corrosion
Which of the following factors is used to control the speed of an induction motor? -
ANSWER- Frequency
Electrical hand tools that use a regular 120-volt system MUST be 3-wire grounded
UNLESS the: - ANSWER- tool is double-insulated and is approved by an independent
testing facility.
A conductor with 220 mils of insulation would have insulation thickness of: - ANSWER-
0.22"
What is the purpose of sealing cable ends that are in storage? - ANSWER- to keep
moisture from entering it
Which one of the fuses is a standard size according to the NEC? - ANSWER- 3
A 1000 KVA three phase transformer has a secondary voltage of 208/120. What is the
secondary full load amperage? - ANSWER-
correct Answers 2025
In a guardrail system, the guardrails can be made of any of the following EXCEPT: -
ANSWER- ropebanding
If the potential across the circuit is 48 volts and the current is 5 amps the resistance of
the circuit is: - ANSWER- 9.6 ohms
A UL listed rod type grounding electrode must have a minimum length of: - ANSWER- 8'
What is the MINIMUM number of overload sensing units required for all three phase
motors? - ANSWER- 3
In a circuit of pure capacitance, the current leads the voltage by an angle of: -
ANSWER- 90-degrees
The standard unit for a measuring the cross-sectional area of a wire is the: - ANSWER-
circular mil
The drawing scale is MOST likely to be found in which of the following drawing
locations? - ANSWER- the drawing little block
The length of a bare copper conductor in a ground ring MUST be buried no less than
2.5' below grade and with a length of at least: - ANSWER- 20 ft.
When installing heating cables for anti-icing systems, cable patters should be in a: -
ANSWER- Serpentine
An auxiliary holding contact (seal-in) on a NEMA starter is indicated by the terminal
marking: - ANSWER- A1 & A2
The neutral bus in a sub panel: - ANSWER- is bonded
The PEAK voltage in a nominal 120/208 VAC system is: - ANSWER- 208V.
THWN conductors have an outer jacket made of: - ANSWER- nylon
What is shown on a sectional drawing? - ANSWER- Cutaway view of a building
, Who is allowed to remove another electrician's tag or lock from any valve, switch, or
piece of equipment without proper authorization? - ANSWER- no one.
The MAIN purpose of a revision block on an electrical drawing is to: - ANSWER- note
any changes to the original drawings
Which of the following is the classified location where combustible vapors are always
present? - ANSWER- class I Div I
With a row of 3-4" conduits and second row of 3-2" and 2-1" conduits for an angle pull
box what is the MINIMUM distance between the opposite walls of the pull box? -
ANSWER- 32"
Exposed field-routed electrical conduit SHOULD be installed so that it: - ANSWER- is
plumb and level
When wiring control push button control circuit, the auxiliary holding contact (seal-in) is
wired with the start button in: - ANSWER- parallel
Ferrous metal raceways, boxes, fittings, and supports must be protected against: -
ANSWER- corrosion
Which of the following factors is used to control the speed of an induction motor? -
ANSWER- Frequency
Electrical hand tools that use a regular 120-volt system MUST be 3-wire grounded
UNLESS the: - ANSWER- tool is double-insulated and is approved by an independent
testing facility.
A conductor with 220 mils of insulation would have insulation thickness of: - ANSWER-
0.22"
What is the purpose of sealing cable ends that are in storage? - ANSWER- to keep
moisture from entering it
Which one of the fuses is a standard size according to the NEC? - ANSWER- 3
A 1000 KVA three phase transformer has a secondary voltage of 208/120. What is the
secondary full load amperage? - ANSWER-
