Solution and Answer Guide Illustrated Guide
to the National Electrical Code Chapter 1-19
Exam
Summary chapter 2 - answers • Conductors within junction boxes must be accessible
without damaging the construction or finish of the build- ing or structure.
Summary chapter 2 - answers • Certain equipment, such as the service disconnecting
means, must be readily accessible.
Summary chapter 2 - answers • The term appliance denotes more than just kitchen
equipment.
Summary chapter 2 - answers Branch circuits are divided into four categories:
appliance, general purpose, individual, and multiwire.
Summary chapter 2 - answers General purpose branch circuits may feed lights and
receptacles or any combination thereof
Summary chapter 2 - answers An individual branch circuit feeds only one piece of
equipment
Summary chapter 2 - answers The terms bonded and grounded are not interchangeable
Summary chapter 2 - answers A multiwire branch circuit must have a means to
simultaneously disconnect all ungrounded (hot) conductors
Summary chapter 2 - answers A load having the maximum level of current sustained for
three hours or more is a continuous load
Summary chapter 2 - answers Equipment is a general term encompassing a wide
variety of items
Summary chapter 2 - answers A grounded conductor and a grounding conductor have
different functions
Summary chapter 2 - answers A grounded conductor is not necessarily a neutral
conductor
Summary chapter 2 - answers One duplex receptacle is not defined as a single
receptacle
Summary chapter 2 - answers Special permission is the written consent of the AHJ
,Summary chapter 3 - answers Limitations apply to the size and number of conductors
permitted in boxes (junction, pull, etc) and conduit bodies
Summary chapter 3 - answers One step (yoke) counts as two of the largest conductors
connected to the device
Summary chapter 3 - answers Nonmetallic boxes may list the maximum number of
conductors permitted in the box, but that number must be reduced if switches,
receptacles, etc are installed in the box
Summary chapter 3 - answers Plaster rings, raised covers, extension rings, etc can
provide additional cubic inch capacity to boxes
Summary chapter 3 - answers Conduit bodies can contain splices, taps, or devices if
the conduit body is durably and legibly marked by the manufacturer with the volume
Summary chapter 3 - answers The minimum length of free conductor is 6 inches is
measured from the point in the box where it emerges from its raceway or cable sheath
Summary chapter 3 - answers Except as permitted in 250.112(1) all metal boxes shall
be grounded and bonded in accordance with parts 1, 4, 5, 6, 7 and 10 of article 250 as
applicable
Summary chapter 3 - answers Boxes and conduit bodies must remain accessible
Summary chapter 3 - answers In suspended ceilings, boxes can be secured by support
wires that are installed in addition to the ceiling grid support wires
Summary chapter 3 - answers Where boxes enclose 4 AWG and larger conductors that
are required to be insulated, different calculations methods apply to straight pulls than to
angle pulls.
Summary chapter 3 - answers There is a minimum distance required between raceways
enclosing the same conductors (4 awg and larger) within a pull or junction box
Summary chapter 3 - answers Conduit bodies may not allow the same size and number
of conductors as is permitted in the conduit ( or tubing) that enters the conduit body
Summary chapter 4 - answers When installed, cables must be protected from the
possibility of physical damage
Summary chapter 4 - answers Conductors must be installed at least 1 1/4 inch from the
nearest edge of the framing member, unless a steel plate (at least 1/16 inch think) has
been installed to protect the conductors
,Summary chapter 4 - answers Conductors passing through metal studs (or framing
members) may require protection in the form of bushing or steel plates
Summary chapter 4 - answers Fire resistant rated construction must remain intact once
the electrical system has been installed
Summary chapter 4 - answers In dwelling, wiring can pass through the short dimension
of a joist(or stud) space being used for environmental air handling purposes
Summary chapter 4 - answers Cables must be secured within a certain distance from
boxes (junction, device, etc) unless the cable has been fished between access points
Summary chapter 4 - answers The maximum distance between supports depends on
the type of cable
Summary chapter 4 - answers The minimum bending radius must be observed when
installing a cable
Summary chapter 4 - answers Unless meeting one of the exemptions in 404.2 (C), a
grounded circuit conductor for the controlled lighting circuit shall be provided at the
location where switches control lighting loads that are supplied by a grounded general
purpose branch circuit
Summary chapter 4 - answers Certain sizes of nonmetallic sheathed cable can be used
as a switch loop (leg) in single pole, three way, and four way switch installations after it
has been reidentified
Summary chapter 4 - answers Table 300.5 contains minimum cover requirements for
direct buried cables and conductors
Summary chapter 4 - answers Chapter 3 of the NEC contains provisions for certain
specialized cables
Summary chapter 5 - answers Raceways shall not be supported by ceiling grid support
wires, but can be supported by independent (additional) support wires
Summary chapter 5 - answers Raceways shall not support other raceways, cables,
conductors, or nonelectric equipment
Summary chapter 5 - answers The maximum total of conduit bends, between pull
points, is four quarter bends (360 degrees)
Summary chapter 5 - answers RMC is a heavy walled metal raceway that can be
threaded
, Summary chapter 5 - answers IMC has thinner walls than does RMC and it can also be
threaded
Summary chapter 5 - answers Unless made up with threaded couplings, RMC and IMC
support requirements are the same as EMT
Summary chapter 5 - answers EMT, the thinnest walled classification of metal
nonflexible raceways, provides protection from all but severe physical damage
Summary chapter 5 - answers The maximum distance between PVC supports
increases as conduit size increases
Summary chapter 5 - answers Certain raceways, permitted as luminaire whips, do not
require support if installed in lengths of 6 ft or less
Summary chapter 5 - answers Wireways are troughs with hinged or removable covers
for housing and protecting conductors and cables
Summary chapter 5 - answers Wireways can pass transversely through walls if the
length passing through the wall is unbroken and if conductors can be accessed on both
sides of the wall
Summary chapter 5 - answers Raceway fill can be calculated from Table 4 and 5,
located in Chapter 9
Summary chapter 5 - answers Conduit (and tubing) nipples can be filled to 60% of their
cross sectional area
Summary chapter 5 - answers Certain conductors properties are listed in Table 310.4
(A)
Summary chapter 5 - answers Conductors temperature limitations must be considered
when determining overcurrent protection
Summary chapter 5 - answers Ambient temperature, the number of current carrying
conductors, and continuous loads can alter maximum conductor ampacity or
overcurrent protection
Summary chapter 6 - answers All 120 volt, single phase , 15 and 20 ampere branch
circuits supplying outlets or devices installed in dwelling units kitchens, family rooms,
dining rooms, living rooms, parlors, libraries, dens, bedrooms, sunrooms, recreation
rooms, closets, hallways, laundry areas, or similar rooms or areas shall be protected by
any of the arc fault circuit interrupter types described in 210.12 (A) (1) through (6)
Summary chapter 6 - answers All nonlocking type 125 and 250 volt, 15 and 20 ampere
receptacles, in all areas specified in 210.52, shall be listed tamper resistant receptacles
to the National Electrical Code Chapter 1-19
Exam
Summary chapter 2 - answers • Conductors within junction boxes must be accessible
without damaging the construction or finish of the build- ing or structure.
Summary chapter 2 - answers • Certain equipment, such as the service disconnecting
means, must be readily accessible.
Summary chapter 2 - answers • The term appliance denotes more than just kitchen
equipment.
Summary chapter 2 - answers Branch circuits are divided into four categories:
appliance, general purpose, individual, and multiwire.
Summary chapter 2 - answers General purpose branch circuits may feed lights and
receptacles or any combination thereof
Summary chapter 2 - answers An individual branch circuit feeds only one piece of
equipment
Summary chapter 2 - answers The terms bonded and grounded are not interchangeable
Summary chapter 2 - answers A multiwire branch circuit must have a means to
simultaneously disconnect all ungrounded (hot) conductors
Summary chapter 2 - answers A load having the maximum level of current sustained for
three hours or more is a continuous load
Summary chapter 2 - answers Equipment is a general term encompassing a wide
variety of items
Summary chapter 2 - answers A grounded conductor and a grounding conductor have
different functions
Summary chapter 2 - answers A grounded conductor is not necessarily a neutral
conductor
Summary chapter 2 - answers One duplex receptacle is not defined as a single
receptacle
Summary chapter 2 - answers Special permission is the written consent of the AHJ
,Summary chapter 3 - answers Limitations apply to the size and number of conductors
permitted in boxes (junction, pull, etc) and conduit bodies
Summary chapter 3 - answers One step (yoke) counts as two of the largest conductors
connected to the device
Summary chapter 3 - answers Nonmetallic boxes may list the maximum number of
conductors permitted in the box, but that number must be reduced if switches,
receptacles, etc are installed in the box
Summary chapter 3 - answers Plaster rings, raised covers, extension rings, etc can
provide additional cubic inch capacity to boxes
Summary chapter 3 - answers Conduit bodies can contain splices, taps, or devices if
the conduit body is durably and legibly marked by the manufacturer with the volume
Summary chapter 3 - answers The minimum length of free conductor is 6 inches is
measured from the point in the box where it emerges from its raceway or cable sheath
Summary chapter 3 - answers Except as permitted in 250.112(1) all metal boxes shall
be grounded and bonded in accordance with parts 1, 4, 5, 6, 7 and 10 of article 250 as
applicable
Summary chapter 3 - answers Boxes and conduit bodies must remain accessible
Summary chapter 3 - answers In suspended ceilings, boxes can be secured by support
wires that are installed in addition to the ceiling grid support wires
Summary chapter 3 - answers Where boxes enclose 4 AWG and larger conductors that
are required to be insulated, different calculations methods apply to straight pulls than to
angle pulls.
Summary chapter 3 - answers There is a minimum distance required between raceways
enclosing the same conductors (4 awg and larger) within a pull or junction box
Summary chapter 3 - answers Conduit bodies may not allow the same size and number
of conductors as is permitted in the conduit ( or tubing) that enters the conduit body
Summary chapter 4 - answers When installed, cables must be protected from the
possibility of physical damage
Summary chapter 4 - answers Conductors must be installed at least 1 1/4 inch from the
nearest edge of the framing member, unless a steel plate (at least 1/16 inch think) has
been installed to protect the conductors
,Summary chapter 4 - answers Conductors passing through metal studs (or framing
members) may require protection in the form of bushing or steel plates
Summary chapter 4 - answers Fire resistant rated construction must remain intact once
the electrical system has been installed
Summary chapter 4 - answers In dwelling, wiring can pass through the short dimension
of a joist(or stud) space being used for environmental air handling purposes
Summary chapter 4 - answers Cables must be secured within a certain distance from
boxes (junction, device, etc) unless the cable has been fished between access points
Summary chapter 4 - answers The maximum distance between supports depends on
the type of cable
Summary chapter 4 - answers The minimum bending radius must be observed when
installing a cable
Summary chapter 4 - answers Unless meeting one of the exemptions in 404.2 (C), a
grounded circuit conductor for the controlled lighting circuit shall be provided at the
location where switches control lighting loads that are supplied by a grounded general
purpose branch circuit
Summary chapter 4 - answers Certain sizes of nonmetallic sheathed cable can be used
as a switch loop (leg) in single pole, three way, and four way switch installations after it
has been reidentified
Summary chapter 4 - answers Table 300.5 contains minimum cover requirements for
direct buried cables and conductors
Summary chapter 4 - answers Chapter 3 of the NEC contains provisions for certain
specialized cables
Summary chapter 5 - answers Raceways shall not be supported by ceiling grid support
wires, but can be supported by independent (additional) support wires
Summary chapter 5 - answers Raceways shall not support other raceways, cables,
conductors, or nonelectric equipment
Summary chapter 5 - answers The maximum total of conduit bends, between pull
points, is four quarter bends (360 degrees)
Summary chapter 5 - answers RMC is a heavy walled metal raceway that can be
threaded
, Summary chapter 5 - answers IMC has thinner walls than does RMC and it can also be
threaded
Summary chapter 5 - answers Unless made up with threaded couplings, RMC and IMC
support requirements are the same as EMT
Summary chapter 5 - answers EMT, the thinnest walled classification of metal
nonflexible raceways, provides protection from all but severe physical damage
Summary chapter 5 - answers The maximum distance between PVC supports
increases as conduit size increases
Summary chapter 5 - answers Certain raceways, permitted as luminaire whips, do not
require support if installed in lengths of 6 ft or less
Summary chapter 5 - answers Wireways are troughs with hinged or removable covers
for housing and protecting conductors and cables
Summary chapter 5 - answers Wireways can pass transversely through walls if the
length passing through the wall is unbroken and if conductors can be accessed on both
sides of the wall
Summary chapter 5 - answers Raceway fill can be calculated from Table 4 and 5,
located in Chapter 9
Summary chapter 5 - answers Conduit (and tubing) nipples can be filled to 60% of their
cross sectional area
Summary chapter 5 - answers Certain conductors properties are listed in Table 310.4
(A)
Summary chapter 5 - answers Conductors temperature limitations must be considered
when determining overcurrent protection
Summary chapter 5 - answers Ambient temperature, the number of current carrying
conductors, and continuous loads can alter maximum conductor ampacity or
overcurrent protection
Summary chapter 6 - answers All 120 volt, single phase , 15 and 20 ampere branch
circuits supplying outlets or devices installed in dwelling units kitchens, family rooms,
dining rooms, living rooms, parlors, libraries, dens, bedrooms, sunrooms, recreation
rooms, closets, hallways, laundry areas, or similar rooms or areas shall be protected by
any of the arc fault circuit interrupter types described in 210.12 (A) (1) through (6)
Summary chapter 6 - answers All nonlocking type 125 and 250 volt, 15 and 20 ampere
receptacles, in all areas specified in 210.52, shall be listed tamper resistant receptacles
