NEC Level 4 EXAM QUESTIONS WITH
CORRECT SOLUTIONS||100%
GUARANTEED PASS||A+
GRADED||UPDATED 2026/2027
SYLLABUS||<<NEWEST VERSION>>
NEC Article 518 contains _____. - ANSWER ✓ requirements for places of
assembly
Overcharging a lead-acid battery will _____. - ANSWER ✓ destroy the positive
plate
Sizing of a generator set for a particular application is _____. - ANSWER ✓
typically done using computer software or manufacturer's literature
Battery capacity can be determined by _____. - ANSWER ✓ performing a load
test
Branch circuits shall be __________ in accordance with the maximum permitted.
210.3 - ANSWER ✓ rated
The point of attachment of 120/240 volt service drop conductors to a building
shall provide above finished grade of at lease _______ feet.
230.26 - ANSWER ✓ 10
Equipment bonding jumpers, when installed outside of a raceway shall have a
maximum length of ______ feet.
250.102(e)(2) - ANSWER ✓ 6
A phase converter used to supply variable loads shall have conductors on the
single phase supply rate at not less than ________ percent of the phase converter
nameplate single phase input full load amperage.
455.6(a) - ANSWER ✓ 125
, Three way and four way switches shall be so wired that all switching is done only
in the _______ circuit conductor.
404.2(a) - ANSWER ✓ ungrounded
Individual open conductors and cable, other than service entrance cables, shall
have a minimumclearance above grade level of at least _____ feet.
225.18(1) - ANSWER ✓ 10
Except in a casr of a concrete encased driven or buried grounding electrode, the
connection of a grounding electrode conductor to a grounding electrode shall be
____________.
250.68(a) - ANSWER ✓ accessible
Where a single rode, pipe, or plate electrode has less resistance to ground the 25
ohms, ________________.
250.53(2) exp - ANSWER ✓ one additional electrode shall be installed
The minimum dimension of working sapce directly in front of a 12 inch wide
panel board which operates at less than 600 volt is ______ inches wide.
110.26(2) - ANSWER ✓ 30
Steel or iron pipe grounding electrode shall be protected from corrosion by
______ protection.
250.53(5)(a) - ANSWER ✓ galvanizing
One electrical devices, the terminal to which grounded conductor is to be attached
shall be substantially ______ in color.
200.9 - ANSWER ✓ white
In a room containing a 480 volt switchboard, a mosonary wall oposite the front of
the switchboard is considered to be ____________.
110.26(a)(6) - ANSWER ✓ grounded
Except where otherwise allowed, non matallic raceway are permitted to be used
for fixing wiring in a theatre if the raceways are encased in at least _____________
inches of concrete.
520.5(a) - ANSWER ✓ 2
,Underwater lighting fixtures mounted in swimming pool walls shall be installed
with the top of the fixture lens below the normal water level of the pool at least
_____ inches.
680.23(5) - ANSWER ✓ 18
Given switchboards and control panels rated 1200 amps or more and which are
over six feet wide shall have at least one entrance at each end of a work space area
to give access to the electrical equipment. Each access to the switechboards and
control panels shall have a minumim width of at least _______ inches.
110.26(13)(2) - ANSWER ✓ 24
The insulation on the conductors within type NM cable shall be rated at ______.
334.112 - ANSWER ✓ 90
Except for specially designed recessed fixtures, thermal insulation is not permitted
within _______ inches of a lighting fixture, enclosure, wiring compartment or
ballast.
410.104(b) - ANSWER ✓ 3
When plate electrodes are used for grounding, each electrode shall be expose a
minimum of _____ of surface to exterior soil.
250.53(7) - ANSWER ✓ two square feet
No part of a cord connected pendant fixture shall be installed in a zone over and
within ______ feet horizontally and eight feet vertically from the top of the bathtub
rim.
410.10(d) - ANSWER ✓ 3
The phase "in sight from" specifies that one piece of equipment shall be visible
and not more than _____ feet in distance from the other.
100 def - ANSWER ✓ 25
The minimum size of the electrical flexible metal conduit FMC ______ inches
electrical trade size.
348.20 - ANSWER ✓ 1/2
The sign shall be placed at the _______ indication type and location of on site
emergency power sources.
700.7 - ANSWER ✓ service entrance equipment
, In floors of transformer vaults in contact with earth shall be of concrete with a
minimum thickness of at least _____ inches.
450.42 - ANSWER ✓ 4
Circuits leading to or through gasoline dispensing equipment shall have _______.
514.11 - ANSWER ✓ a means to disconnect all conductors including the neutral
The minimum headroom required in front of a motor control center shall be
______ feet. - ANSWER ✓ 6 1/2
At least ______ inches of free conductor, measured fron the point in the box
where the wires emerge from the cable sheets, shall be left at each outlet for the
connection of fixtures or devices.
300.14 - ANSWER ✓ 6
The word Approved means acceptable to the _______.
100 def - ANSWER ✓ Authority havinf jurisdicition
Transfer switches are sized based on ____. - ANSWER ✓ the calculated
continuous current
The nominal open circuit voltage of a lead-acid cell is _____. - ANSWER ✓ 2.0V
The most common method of cooling standby generator sets is _____. -
ANSWER ✓ a mounted radiator with an engine-driven fan
Systems installed to protect loads such as communications, ventilation, or lighting
systems that, when stopped, could create hazards or hamper rescue or fire-fighting
operations are known as _____. - ANSWER ✓ legally required standby systems
Which type of engine-driven AC generator is commonly used as a standby system
because they have a longer life and require less maintenance? - ANSWER ✓
Diesel-powered
In an AC generator, the field windings are energized by the _____. - ANSWER ✓
exciter
CORRECT SOLUTIONS||100%
GUARANTEED PASS||A+
GRADED||UPDATED 2026/2027
SYLLABUS||<<NEWEST VERSION>>
NEC Article 518 contains _____. - ANSWER ✓ requirements for places of
assembly
Overcharging a lead-acid battery will _____. - ANSWER ✓ destroy the positive
plate
Sizing of a generator set for a particular application is _____. - ANSWER ✓
typically done using computer software or manufacturer's literature
Battery capacity can be determined by _____. - ANSWER ✓ performing a load
test
Branch circuits shall be __________ in accordance with the maximum permitted.
210.3 - ANSWER ✓ rated
The point of attachment of 120/240 volt service drop conductors to a building
shall provide above finished grade of at lease _______ feet.
230.26 - ANSWER ✓ 10
Equipment bonding jumpers, when installed outside of a raceway shall have a
maximum length of ______ feet.
250.102(e)(2) - ANSWER ✓ 6
A phase converter used to supply variable loads shall have conductors on the
single phase supply rate at not less than ________ percent of the phase converter
nameplate single phase input full load amperage.
455.6(a) - ANSWER ✓ 125
, Three way and four way switches shall be so wired that all switching is done only
in the _______ circuit conductor.
404.2(a) - ANSWER ✓ ungrounded
Individual open conductors and cable, other than service entrance cables, shall
have a minimumclearance above grade level of at least _____ feet.
225.18(1) - ANSWER ✓ 10
Except in a casr of a concrete encased driven or buried grounding electrode, the
connection of a grounding electrode conductor to a grounding electrode shall be
____________.
250.68(a) - ANSWER ✓ accessible
Where a single rode, pipe, or plate electrode has less resistance to ground the 25
ohms, ________________.
250.53(2) exp - ANSWER ✓ one additional electrode shall be installed
The minimum dimension of working sapce directly in front of a 12 inch wide
panel board which operates at less than 600 volt is ______ inches wide.
110.26(2) - ANSWER ✓ 30
Steel or iron pipe grounding electrode shall be protected from corrosion by
______ protection.
250.53(5)(a) - ANSWER ✓ galvanizing
One electrical devices, the terminal to which grounded conductor is to be attached
shall be substantially ______ in color.
200.9 - ANSWER ✓ white
In a room containing a 480 volt switchboard, a mosonary wall oposite the front of
the switchboard is considered to be ____________.
110.26(a)(6) - ANSWER ✓ grounded
Except where otherwise allowed, non matallic raceway are permitted to be used
for fixing wiring in a theatre if the raceways are encased in at least _____________
inches of concrete.
520.5(a) - ANSWER ✓ 2
,Underwater lighting fixtures mounted in swimming pool walls shall be installed
with the top of the fixture lens below the normal water level of the pool at least
_____ inches.
680.23(5) - ANSWER ✓ 18
Given switchboards and control panels rated 1200 amps or more and which are
over six feet wide shall have at least one entrance at each end of a work space area
to give access to the electrical equipment. Each access to the switechboards and
control panels shall have a minumim width of at least _______ inches.
110.26(13)(2) - ANSWER ✓ 24
The insulation on the conductors within type NM cable shall be rated at ______.
334.112 - ANSWER ✓ 90
Except for specially designed recessed fixtures, thermal insulation is not permitted
within _______ inches of a lighting fixture, enclosure, wiring compartment or
ballast.
410.104(b) - ANSWER ✓ 3
When plate electrodes are used for grounding, each electrode shall be expose a
minimum of _____ of surface to exterior soil.
250.53(7) - ANSWER ✓ two square feet
No part of a cord connected pendant fixture shall be installed in a zone over and
within ______ feet horizontally and eight feet vertically from the top of the bathtub
rim.
410.10(d) - ANSWER ✓ 3
The phase "in sight from" specifies that one piece of equipment shall be visible
and not more than _____ feet in distance from the other.
100 def - ANSWER ✓ 25
The minimum size of the electrical flexible metal conduit FMC ______ inches
electrical trade size.
348.20 - ANSWER ✓ 1/2
The sign shall be placed at the _______ indication type and location of on site
emergency power sources.
700.7 - ANSWER ✓ service entrance equipment
, In floors of transformer vaults in contact with earth shall be of concrete with a
minimum thickness of at least _____ inches.
450.42 - ANSWER ✓ 4
Circuits leading to or through gasoline dispensing equipment shall have _______.
514.11 - ANSWER ✓ a means to disconnect all conductors including the neutral
The minimum headroom required in front of a motor control center shall be
______ feet. - ANSWER ✓ 6 1/2
At least ______ inches of free conductor, measured fron the point in the box
where the wires emerge from the cable sheets, shall be left at each outlet for the
connection of fixtures or devices.
300.14 - ANSWER ✓ 6
The word Approved means acceptable to the _______.
100 def - ANSWER ✓ Authority havinf jurisdicition
Transfer switches are sized based on ____. - ANSWER ✓ the calculated
continuous current
The nominal open circuit voltage of a lead-acid cell is _____. - ANSWER ✓ 2.0V
The most common method of cooling standby generator sets is _____. -
ANSWER ✓ a mounted radiator with an engine-driven fan
Systems installed to protect loads such as communications, ventilation, or lighting
systems that, when stopped, could create hazards or hamper rescue or fire-fighting
operations are known as _____. - ANSWER ✓ legally required standby systems
Which type of engine-driven AC generator is commonly used as a standby system
because they have a longer life and require less maintenance? - ANSWER ✓
Diesel-powered
In an AC generator, the field windings are energized by the _____. - ANSWER ✓
exciter
