NEC Study Guide Review with Verified Answers Rated A
90.1 (A) Practical Safeguarding - -The purposes of transformations, transmissions, energy storage, or
this code is the practical safeguarding of person and distribution of power used exclusively for operation on
property from hazards arising from the use of rolling stock or installation used exclusively for signaling
electricity.This code is not intended as design and communication purposes.
specifications or an instruction manual for untrained (4) Installations of communications equipment under the
persons. exclusive control of communication utilities located
outdoors or in building space is used exclusively for such
installations.
90.1 (B) Adequacy. - -This code Contains (5) Installations under the exclusive control of an electric
provisions that are considered necessary for safety. and utilities were such installations...(a-d)
Compliance there with and proper maintenance result in
installation that is essentially free From hazard but not
necessarily efficient, convenient, or adequate for good 90.2 (C) Special permission - -The Authority having
service or future expansion of electrical use. jurisdiction for enforcing this code may grant exception for
the installation of conductors and equipment that are not
under exclusive control over electric utilities and are used
90.1 (C) Relation to Other Internal Standard - - to connect electric utility supply system to the service
TheRequirements in this code address is the fundamental conductor of the premises served, provided search
principles of protection for safety Contained in section 131 installations are outside a building or structure, or
of international electrotechnical commission standards terminate inside at a readily accessible location nearest
60364-1 Section 131 electrical installation of buildings. the point of entrance of the service conductor.
90.2 Scope (A) Covered - -This code Covers the 90.3 Code Arrangement - -This code If divided into
installation and removal of electrical conductors, the introduction and nine chapters as shown in figure 19.3
equipment, and raceways; an optical fiber cables for the chapter 1, 2, 3, and four apply "GENERALLY". Chapters
following: 5,6 and 7 applied to "special occupancies, special
(1) Public and private premises, including buildings, equipment, or other special conditions in May supplement
structures, mobile homes, recreation of vehicles, and or modify the requirements in chapter 1-7".
floating buildings.
(2) Yard, lots, parking lots, Carnivores, and industrial
substations. 90.4 Enforcement - -This code is intended to be a
(3) Installation of conductors and equipment that connect suitable for mandatory applications by government total
to the supply of electricity. body use that exercise legal jurisdiction over electrical
(4) Installation used by the electric utility, Search office as installations, including signaling and communication
Office building, where houses, garages, machine shops, systems, and for the use by insurance inspectors. The
and re-creation of buildings, that are not an integral part of authority having jurisdiction for enforcement of code has
a generation plants, substation, or control center. the responsibility for making interpretations of the rules for
(5) Installation supplying shore power to ships and deciding on the approval of equipment and materials, and
watercraft in Marina's in boat Yard including monitoring for the granting the special permission contemplated in
leakage current. numbers of the rules.
(6) Installations used to export electricity power from
vehicles to premises wiring or four by directional current By special permission, the authority having jurisdiction
flow. may waive specific requirements in this cold or permanent
alternative methods where it is assured that equivalent
objectives can be achieved by establishing and
90.2 Scope (B) Not Covered - -(1) Installations in maintaining effective safety.
ships, water crafts other than floating buildings railway,
rolling stock, aircraft, automotive vehicles Other than This code may require new products, construction, or
mobile homes and recreational vehicles. materials that may not yet be available at the time the
(2) Installations underground in mines and self-propelled code is adopted. In such event, the authority having
mobile surface mining machinery and its attendant jurisdiction may permit the use of the products,
electrical training cable. constructions, or materials that comply with the most
(3) Installations of railway for generations, recent previous edition of this code adopted by the
, NEC Study Guide Review with Verified Answers Rated A
jurisdiction. Convenience. - -Plans and Specifications that
provide ample Space in raceways, spare raceways, and
additional spaces allow for future increases in electrical
90.5 (A) Mandatory Rules - -Mandatory rules of this power and communication circuits. Distribution centers
code Are those that identify actions that are specifically located in readily accessible locations provide
required or prohibited and are characterized by the use of convenience and safety of operation.
the term "shall" or "shall not".
90.8 (B) Number of Circuits in Enclosures. - -It is
90.5 (B) Permissive Rule - -Permissive Rules of this Elsewhere provided in this code that the number of circuits
code are those that identify actions that are allowed but confined in a single enclosure be very restricted. Limiting
not required or normal used to describe actions or the number of circuits in a single enclosure minimizes the
alternative methods and are characterized by the use of fact from short Circuit or ground fault.
the term "shall be permitted" or "shall not be required".
90.9 Units of Measurement (A) Measurement System Of
90.5 (C) Explanatory Material - -Explanatory Prefrence - -For the Purpose of this code Metric unit
Material, such as references to other standards, of Measurements are Are in accordance with the
references to related sections of this code, or information modernize metric systemKnown as the international
related to a code rule, is included in this code in form of system of units (SI).
informational notes. Search Notes our informational only
enter not enforce the rule as requirements of this code.
90.9 (B) Dual system of units. - -SI unit shall appear
First, And inch-pound units shall immediately follow in
90.5 (D) Informative Annexes - -Non-Mandatory parentheses. Conversion from inch-pound units to SI units
information relative to the use of the NEC is provided in shall be based on hard conversion and shall be permitted
informative annexes. informative annexes are not part of to use soft conversion.
this Code of the enforceable requirements of the NEC, but
are included for information purposes only.
90.9 (C) Permitted uses of soft conversions. - -The
cases given in 90.9(c) (1) through (c) (4) shall not be
90.6 Formal Interpretations - -To promote uniformity required to use hard conversion and shall be permitted to
relative of interpretation and application of this code, use soft conversion.
formal interpretation procedures have been established (1)Trade Sizes
and are found in that NFPA regulations governing Where are the actual measurements size of a product is
committee projects. not the same as nominal size, trade size designators shall
be used rather than dimensions. Trade practices shall be
followed in all cases.
90.7 Examination of Equipment for Safety - -For (2) Extracted Material
specific items of equipment and materials referred to in Where Material is extracted from Another standard, the
this code, examination for safety made under standard contents of the original material shall not be compromised
conditions provide a basis for formal approval where the or violated. Any editing Of the extracted text shall be
record is made generally available through Promulgation confined to making the consistent with that of the NEC.
by organizations properly equipped and qualified for (3) Industry Practices
experimental testing, Inspections of the run of good at Where industry practice is to express unit-pound units, the
factories, and services-value determination through inclusions of SI units shall not be required.
inspections.ThisAvoid the necessity repetition of (4) Safety
examinations five different examiners, frequently with Where a negative impact on safety would result, soft
Inadequate facilities for such work, and the confusion that conversion shall be used.
would result from conflicting reports on the suitability of
devices and materials examine for a given purpose.
90.9 (D) Compliance. - -Conversion from inch-pound
units to SI units shall be permitted to be an approximate
90.8 Wiring Planing (A) Future Expansion and conversion. Compliance with the number shown in either
, NEC Study Guide Review with Verified Answers Rated A
the (SI) system or the inch-pound system shall constitute forth.(CMP-17)
compliance with this Code.
100.0 Approved - -Acceptable to the authority
100.0 Scope - -This article Contains only those having jurisdiction. (CMP-1)
definitions essential to the application of this code. It is not
intended to include commonly defined general term or
commonly defined technical terms for related codes and 100.0 Arc-Fault Circut Interrupter (AFCI) - -A Device
standards. In general only those terms that are used in intended to provided protection from the effects of are
two or more articles are defined in article 100. Definitions faults by recognizing characteristics unique to arcing and
are also found and XXX.2 section of other articles. by functioning to De-energize the Circuit when an arc fault
is detected. (CMP-2)
100.0 Accessible(as applied to equipment). - -
Capable ofBeen reached for operation, renewal, and 100.0 Attachment Fitting - -A device that, by
inspection.(CMP-1) insertion into a locking support and mounting
receptacle,establishes a connection between the
conductors of the attached utilization equipment and the
100.0 Accessible (as applied to wiring methods) - - branch-circuit conductor connected to the locking support
Capable of being removed or exposed without damaging and mounting receptacle.(CMP-18)
the building structure or finish or not permanently closed
in by the structure or finish off the building.(CMP-1)
100.0 Attachment Plug (Plug Cap)(Plug) - -A devic
that, by insertion in a receptacle, establishes a connection
100.0 Adjustable Speed Drive - -Power between the conductors of the attached flexible cord and
ConversionEquipment that Provides a means of adjusting the conductors connected permanently to the receptacle.
the speed of an electric motor. (CMP-11)
100.0 Authority Having Jurisdiction (AHJ) - -An
100.0 Accessible, Readily (Readily Accessible). - - organization,office, or individual responsible for enforcing
CapableOf being reached quickly for operation, renewal, the requirements of a code or standard, or for approving
or inspections without requiring those who are ready equipment, material, an installation, or a procedure.(CMP-
access is requisite to take action such as to use tools 1)
(other than keys), to climb over or under, to remove
obstacle, or to resort to portable ladders, and so
fourth.(CMP-1) 100.0 Automatic - -Performing a function without the
necessity of human intervention.(CMP-1)
100.0 Adjustable Speed Drive System - -A
combination of an adjustable speed drive, it's associated 100.0 Bathroom - -An area including a sink(basin)
motor(s), and auxiliary equipment. (CMP-11) with one or more of the following: a toilet, a urinal, a tub, a
shower, a Bidet, or similar plumbing fixtures.(CMP-2)
100.0 Ampacity - -The Maximum current, in
amperes,that a conductor can carry continuously under 100.0 Battery System - -Interconnected battery
the conditions of use without exceeding its temperature subsystems consisting of one or more storage batteries
rating. (CMP-6) and battery chargers, and can include inverters,
converters, and associated electrical equipment.(CMP-13)
100.0 Appliance - -Utilization Equipment, generally
other than industrial, that is normally built in standardized 100.0 Bonded (bonding) - -Connected to establish
sizes or types and is installed or connected as a unit to electrical continuity and conductivity. (CMP-5)
perform one or more functions such as clothes washing,
air conditioning, food mixing, deep frying, and so
90.1 (A) Practical Safeguarding - -The purposes of transformations, transmissions, energy storage, or
this code is the practical safeguarding of person and distribution of power used exclusively for operation on
property from hazards arising from the use of rolling stock or installation used exclusively for signaling
electricity.This code is not intended as design and communication purposes.
specifications or an instruction manual for untrained (4) Installations of communications equipment under the
persons. exclusive control of communication utilities located
outdoors or in building space is used exclusively for such
installations.
90.1 (B) Adequacy. - -This code Contains (5) Installations under the exclusive control of an electric
provisions that are considered necessary for safety. and utilities were such installations...(a-d)
Compliance there with and proper maintenance result in
installation that is essentially free From hazard but not
necessarily efficient, convenient, or adequate for good 90.2 (C) Special permission - -The Authority having
service or future expansion of electrical use. jurisdiction for enforcing this code may grant exception for
the installation of conductors and equipment that are not
under exclusive control over electric utilities and are used
90.1 (C) Relation to Other Internal Standard - - to connect electric utility supply system to the service
TheRequirements in this code address is the fundamental conductor of the premises served, provided search
principles of protection for safety Contained in section 131 installations are outside a building or structure, or
of international electrotechnical commission standards terminate inside at a readily accessible location nearest
60364-1 Section 131 electrical installation of buildings. the point of entrance of the service conductor.
90.2 Scope (A) Covered - -This code Covers the 90.3 Code Arrangement - -This code If divided into
installation and removal of electrical conductors, the introduction and nine chapters as shown in figure 19.3
equipment, and raceways; an optical fiber cables for the chapter 1, 2, 3, and four apply "GENERALLY". Chapters
following: 5,6 and 7 applied to "special occupancies, special
(1) Public and private premises, including buildings, equipment, or other special conditions in May supplement
structures, mobile homes, recreation of vehicles, and or modify the requirements in chapter 1-7".
floating buildings.
(2) Yard, lots, parking lots, Carnivores, and industrial
substations. 90.4 Enforcement - -This code is intended to be a
(3) Installation of conductors and equipment that connect suitable for mandatory applications by government total
to the supply of electricity. body use that exercise legal jurisdiction over electrical
(4) Installation used by the electric utility, Search office as installations, including signaling and communication
Office building, where houses, garages, machine shops, systems, and for the use by insurance inspectors. The
and re-creation of buildings, that are not an integral part of authority having jurisdiction for enforcement of code has
a generation plants, substation, or control center. the responsibility for making interpretations of the rules for
(5) Installation supplying shore power to ships and deciding on the approval of equipment and materials, and
watercraft in Marina's in boat Yard including monitoring for the granting the special permission contemplated in
leakage current. numbers of the rules.
(6) Installations used to export electricity power from
vehicles to premises wiring or four by directional current By special permission, the authority having jurisdiction
flow. may waive specific requirements in this cold or permanent
alternative methods where it is assured that equivalent
objectives can be achieved by establishing and
90.2 Scope (B) Not Covered - -(1) Installations in maintaining effective safety.
ships, water crafts other than floating buildings railway,
rolling stock, aircraft, automotive vehicles Other than This code may require new products, construction, or
mobile homes and recreational vehicles. materials that may not yet be available at the time the
(2) Installations underground in mines and self-propelled code is adopted. In such event, the authority having
mobile surface mining machinery and its attendant jurisdiction may permit the use of the products,
electrical training cable. constructions, or materials that comply with the most
(3) Installations of railway for generations, recent previous edition of this code adopted by the
, NEC Study Guide Review with Verified Answers Rated A
jurisdiction. Convenience. - -Plans and Specifications that
provide ample Space in raceways, spare raceways, and
additional spaces allow for future increases in electrical
90.5 (A) Mandatory Rules - -Mandatory rules of this power and communication circuits. Distribution centers
code Are those that identify actions that are specifically located in readily accessible locations provide
required or prohibited and are characterized by the use of convenience and safety of operation.
the term "shall" or "shall not".
90.8 (B) Number of Circuits in Enclosures. - -It is
90.5 (B) Permissive Rule - -Permissive Rules of this Elsewhere provided in this code that the number of circuits
code are those that identify actions that are allowed but confined in a single enclosure be very restricted. Limiting
not required or normal used to describe actions or the number of circuits in a single enclosure minimizes the
alternative methods and are characterized by the use of fact from short Circuit or ground fault.
the term "shall be permitted" or "shall not be required".
90.9 Units of Measurement (A) Measurement System Of
90.5 (C) Explanatory Material - -Explanatory Prefrence - -For the Purpose of this code Metric unit
Material, such as references to other standards, of Measurements are Are in accordance with the
references to related sections of this code, or information modernize metric systemKnown as the international
related to a code rule, is included in this code in form of system of units (SI).
informational notes. Search Notes our informational only
enter not enforce the rule as requirements of this code.
90.9 (B) Dual system of units. - -SI unit shall appear
First, And inch-pound units shall immediately follow in
90.5 (D) Informative Annexes - -Non-Mandatory parentheses. Conversion from inch-pound units to SI units
information relative to the use of the NEC is provided in shall be based on hard conversion and shall be permitted
informative annexes. informative annexes are not part of to use soft conversion.
this Code of the enforceable requirements of the NEC, but
are included for information purposes only.
90.9 (C) Permitted uses of soft conversions. - -The
cases given in 90.9(c) (1) through (c) (4) shall not be
90.6 Formal Interpretations - -To promote uniformity required to use hard conversion and shall be permitted to
relative of interpretation and application of this code, use soft conversion.
formal interpretation procedures have been established (1)Trade Sizes
and are found in that NFPA regulations governing Where are the actual measurements size of a product is
committee projects. not the same as nominal size, trade size designators shall
be used rather than dimensions. Trade practices shall be
followed in all cases.
90.7 Examination of Equipment for Safety - -For (2) Extracted Material
specific items of equipment and materials referred to in Where Material is extracted from Another standard, the
this code, examination for safety made under standard contents of the original material shall not be compromised
conditions provide a basis for formal approval where the or violated. Any editing Of the extracted text shall be
record is made generally available through Promulgation confined to making the consistent with that of the NEC.
by organizations properly equipped and qualified for (3) Industry Practices
experimental testing, Inspections of the run of good at Where industry practice is to express unit-pound units, the
factories, and services-value determination through inclusions of SI units shall not be required.
inspections.ThisAvoid the necessity repetition of (4) Safety
examinations five different examiners, frequently with Where a negative impact on safety would result, soft
Inadequate facilities for such work, and the confusion that conversion shall be used.
would result from conflicting reports on the suitability of
devices and materials examine for a given purpose.
90.9 (D) Compliance. - -Conversion from inch-pound
units to SI units shall be permitted to be an approximate
90.8 Wiring Planing (A) Future Expansion and conversion. Compliance with the number shown in either
, NEC Study Guide Review with Verified Answers Rated A
the (SI) system or the inch-pound system shall constitute forth.(CMP-17)
compliance with this Code.
100.0 Approved - -Acceptable to the authority
100.0 Scope - -This article Contains only those having jurisdiction. (CMP-1)
definitions essential to the application of this code. It is not
intended to include commonly defined general term or
commonly defined technical terms for related codes and 100.0 Arc-Fault Circut Interrupter (AFCI) - -A Device
standards. In general only those terms that are used in intended to provided protection from the effects of are
two or more articles are defined in article 100. Definitions faults by recognizing characteristics unique to arcing and
are also found and XXX.2 section of other articles. by functioning to De-energize the Circuit when an arc fault
is detected. (CMP-2)
100.0 Accessible(as applied to equipment). - -
Capable ofBeen reached for operation, renewal, and 100.0 Attachment Fitting - -A device that, by
inspection.(CMP-1) insertion into a locking support and mounting
receptacle,establishes a connection between the
conductors of the attached utilization equipment and the
100.0 Accessible (as applied to wiring methods) - - branch-circuit conductor connected to the locking support
Capable of being removed or exposed without damaging and mounting receptacle.(CMP-18)
the building structure or finish or not permanently closed
in by the structure or finish off the building.(CMP-1)
100.0 Attachment Plug (Plug Cap)(Plug) - -A devic
that, by insertion in a receptacle, establishes a connection
100.0 Adjustable Speed Drive - -Power between the conductors of the attached flexible cord and
ConversionEquipment that Provides a means of adjusting the conductors connected permanently to the receptacle.
the speed of an electric motor. (CMP-11)
100.0 Authority Having Jurisdiction (AHJ) - -An
100.0 Accessible, Readily (Readily Accessible). - - organization,office, or individual responsible for enforcing
CapableOf being reached quickly for operation, renewal, the requirements of a code or standard, or for approving
or inspections without requiring those who are ready equipment, material, an installation, or a procedure.(CMP-
access is requisite to take action such as to use tools 1)
(other than keys), to climb over or under, to remove
obstacle, or to resort to portable ladders, and so
fourth.(CMP-1) 100.0 Automatic - -Performing a function without the
necessity of human intervention.(CMP-1)
100.0 Adjustable Speed Drive System - -A
combination of an adjustable speed drive, it's associated 100.0 Bathroom - -An area including a sink(basin)
motor(s), and auxiliary equipment. (CMP-11) with one or more of the following: a toilet, a urinal, a tub, a
shower, a Bidet, or similar plumbing fixtures.(CMP-2)
100.0 Ampacity - -The Maximum current, in
amperes,that a conductor can carry continuously under 100.0 Battery System - -Interconnected battery
the conditions of use without exceeding its temperature subsystems consisting of one or more storage batteries
rating. (CMP-6) and battery chargers, and can include inverters,
converters, and associated electrical equipment.(CMP-13)
100.0 Appliance - -Utilization Equipment, generally
other than industrial, that is normally built in standardized 100.0 Bonded (bonding) - -Connected to establish
sizes or types and is installed or connected as a unit to electrical continuity and conductivity. (CMP-5)
perform one or more functions such as clothes washing,
air conditioning, food mixing, deep frying, and so
