Understanding NEC Articles 100 & 110

Question 1

Capable of being removed or exposed without damaging the building structure or finish or not permanently closed in or blocked by the structure other electrical equipment other building systems or finish of the building refers to _____.
Answer 1: wiring methods that are accessible
Answer 2: equipment that is accessible
Answer 3: being readily accessible
Answer 4: being serviceable

Answer 1

Answer 1: wiring methods that are accessible

100 Accessible (wiring methods).

Question 2

The maximum current in amperes that a conductor can carry continuously under the conditions of use without exceeding its temperature rating is known as its _____.
Answer 1: short-circuit rating
Answer 2: ground-fault rating
Answer 3: ampacity
Answer 4: all of these

Answer 2

Answer 3: ampacity

100 Ampacity

Question 3

A _____ is an area including a sink with one or more of the following: a toilet urinal tub shower bidet or similar plumbing fixtures.
Answer 1: suite
Answer 2: bathroom
Answer 3: rest area
Answer 4: all of these

Answer 3

Answer 2: bathroom

100 Bathroom

Question 4

The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s) are known as _____ conductors.
Answer 1: feeder
Answer 2: branch-circuit
Answer 3: home run
Answer 4: main circuit

Answer 4

Answer 2: branch-circuit

100 Branch Circuit (Branch-Circuit)

Question 5

The NEC defines a(an) _____ as a structure that stands alone or that is separated from adjoining structures by fire walls.
Answer 1: unit
Answer 2: apartment
Answer 3: building
Answer 4: utility

Answer 5

Answer 3: building

100 Building

Question 6

An enclosure designed for either surface mounting or flush mounting provided with a frame in which a door(s) can be hung is called a(an) _____.
Answer 1: electrical housing
Answer 2: outlet box
Answer 3: cutout box
Answer 4: cabinet

Answer 6

Answer 4: cabinet

100 Cabinet

Question 7

Type _____ cable is a cable with insulated conductors within an overall nonmetallic jacket.
Answer 1: AC
Answer 2: MC
Answer 3: NM
Answer 4: TC

Answer 7

Answer 3: NM

100 Cable, Nonmetallic-Sheathed (Type NM)

Question 8

Type _____ is a service-entrance cable identified for underground use having a moisture-resistant covering but not required to have a flame-retardant covering.
Answer 1: SE
Answer 2: NM
Answer 3: UF
Answer 4: USE

Answer 8

Answer 4: USE

100 Cable, Service Entrance (Type USE)

Question 9

A circuit breaker is a device designed to open and close a circuit by nonautomatic means and to _____ the circuit automatically on a predetermined overcurrent without damage to itself when properly applied within its rating.
Answer 1: energize
Answer 2: reset
Answer 3: connect
Answer 4: open

Answer 9

Answer 4: open

100 Circuit Breaker

Question 10

Wires are considered _____ if rendered inaccessible by the structure or finish of the building.
Answer 1: inaccessible
Answer 2: concealed
Answer 3: hidden
Answer 4: enclosed

Answer 10

Answer 2: concealed

100 Concealed

Question 11

A continuous load is a load where the maximum current is expected to continue for _____ hour(s) or more.
Answer 1: 1/2
Answer 2: 1
Answer 3: 2
Answer 4: 3

Answer 11

Answer 4: 3

100 Continuous Load

Question 12

A counter or countertop is a fixed or stationary surface typically intended for _____.
Answer 1: food preparation
Answer 2: serving
Answer 3: laundering
Answer 4: any of these

Answer 12

Answer 4: any of these

100 Counter (Countertop)

Question 13

A unit of an electrical system other than a conductor which carries or controls electric energy as its principal function is known as a(an) _____.
Answer 1: raceway
Answer 2: fitting
Answer 3: device
Answer 4: enclosure

Answer 13

Answer 3: device

100 Device

Question 14

A dormitory unit is a building or a space in a building in which group sleeping accommodations are provided for more than _____ persons who are not members of the same family in one room or a series of closely associated rooms under joint occupancy and single management with or without meals but without individual cooking facilities.
Answer 1: 6
Answer 2: 10
Answer 3: 12
Answer 4: 16

Answer 14

Answer 4: 16

100 Dormitory Unit

Question 15

A _____ is a single unit that provides complete and independent living facilities for one or more persons including permanent provisions for living sleeping cooking and sanitation.
Answer 1: one-family dwelling
Answer 2: two-family dwelling
Answer 3: dwelling unit
Answer 4: multifamily dwelling

Answer 15

Answer 3: dwelling unit

100 Dwelling Unit

Question 16

Exposed (as applied to _____) is defined as on or attached to the surface or behind access panels designed to allow access.
Answer 1: equipment
Answer 2: luminaires
Answer 3: wiring methods
Answer 4: motors

Answer 16

Answer 3: wiring methods

100 Exposed (as applied to wiring methods)

Question 17

The largest amount of current capable of being delivered at a point on the system during a short-circuit condition is the definition of _____.
Answer 1: objectionable current
Answer 2: excessive current
Answer 3: induced current
Answer 4: available fault current

Answer 17

Answer 4: available fault current

100 Fault curent, Available

Question 18

The NEC defines a _____ as all circuit conductors between the service equipment the source of a separately derived system or other power supply source and the final branch-circuit overcurrent device.
Answer 1: service
Answer 2: feeder
Answer 3: branch circuit
Answer 4: all of these

Answer 18

Answer 2: feeder

100 Feeder

Question 19

A Class A GFCI trips when the ground-fault current is _____ or higher.
Answer 1: 4 mA
Answer 2: 5 mA
Answer 3: 6 mA
Answer 4: 7 mA

Answer 19

Answer 3: 6 mA

100 Ground-Fault Circuit Interrupter, Informational Note

Question 20

Connected to ground without the insertion of any resistor or impedance device is referred to as _____.
Answer 1: grounded
Answer 2: solidly grounded
Answer 3: effectively grounded
Answer 4: a grounding conductor

Answer 20

Answer 2: solidly grounded

100 Grounded, Solidly (Solidly Grounded)

Question 21

A habitable room in a building is a room for _____ but excluding bathrooms toilet rooms closets hallways storage or utility spaces and similar areas.
Answer 1: living
Answer 2: sleeping
Answer 3: eating or cooking
Answer 4: all of these

Answer 21

Answer 4: all of these

100 Habitable Room

Question 22

In sight from or within sight from is defined as equipment that is visible and not more than _____ distant from other equipment is in sight from that other equipment.
Answer 1: 10 feet
Answer 2: 20 feet
Answer 3: 25 feet
Answer 4: 50 feet

Answer 22

Answer 4: 50 feet

100 In Sight from (Within Sight From, Within Sight)

Question 23

A kitchen is defined as an area with a sink and _____ provisions for food preparation and cooking.
Answer 1: listed
Answer 2: labeled
Answer 3: temporary
Answer 4: permanent

Answer 23

Answer 4: permanent

100 Kitchen

Question 24

A laundry area is an area containing or designed to contain a _____.
Answer 1: laundry tray
Answer 2: clothes washer
Answer 3: clothes dryer
Answer 4: any of these

Answer 24

Answer 4: any of these

100 Laundry Area

Question 25

A location protected from weather and not subject to saturation with water or other liquids but subject to moderate degrees of moisture defines a _____ location.
Answer 1: dry
Answer 2: damp
Answer 3: wet
Answer 4: moist

Answer 25

Answer 2: damp

100 Location, Damp (Damp Location)

Question 26

A location unprotected and exposed to weather subject to saturation underground or in concrete slabs in direct contact with the earth defines a _____ location.
Answer 1: dry
Answer 2: damp
Answer 3: wet
Answer 4: moist

Answer 26

Answer 3: wet

100 Location, Wet (Wet Location)

Question 27

A neutral conductor is the conductor connected to the _____ of a system which is intended to carry current under normal conditions.
Answer 1: grounding electrode
Answer 2: neutral point
Answer 3: intersystem bonding termination
Answer 4: electrical grid

Answer 27

Answer 2: neutral point

100 Neutral Conductor

Question 28

A(An) _____ is a point on the wiring system at which current is taken to supply utilization equipment.
Answer 1: box
Answer 2: receptacle
Answer 3: outlet
Answer 4: device

Answer 28

Answer 3: outlet

100 Outlet

Question 29

Any current in excess of the rated current of equipment or the ampacity of a conductor is called _____.
Answer 1: trip current
Answer 2: fault current
Answer 3: overcurrent
Answer 4: a short circuit

Answer 29

Answer 3: overcurrent

100 Overcurrent

Question 30

A _____ is the machine that supplies the mechanical horsepower to a generator.
Answer 1: prime mover
Answer 2: motor
Answer 3: capacitor
Answer 4: starter

Answer 30

Answer 1: prime mover

100 Prime Mover

Question 31

An outlet where one or more receptacles are installed is called a(an) _____.
Answer 1: device
Answer 2: equipment
Answer 3: receptacle
Answer 4: receptacle outlet

Answer 31

Answer 4: receptacle outlet

100 Receptacle Outlet

Question 32

A _____ system is an electrical power supply output other than a service having no direct connection(s) to circuit conductors of any other electrical source other than those established by grounding and bonding connections.
Answer 1: separately derived
Answer 2: classified
Answer 3: direct
Answer 4: emergency

Answer 32

Answer 1: separately derived

100 Separately Derived System

Question 33

The _____ is the necessary equipment consisting of a circuit breaker(s) or switch(es) and fuse(s) and their accessories connected to the serving utility and intended to constitute the main control and disconnect of the serving utility.
Answer 1: service equipment
Answer 2: feeder equipment
Answer 3: feeder disconnect
Answer 4: none of these

Answer 33

Answer 1: service equipment

100 Service Equipment

Question 34

General requirements for the examination and approval installation and use access to and spaces about electrical conductors and equipment; enclosures intended for personnel entry; and tunnel installations are within the scope of _____.
Answer 1: Article 800
Answer 2: Article 300
Answer 3: Article 110
Answer 4: Annex J

Answer 34

Answer 3: Article 110

110.1

Question 35

The conductors and equipment required or permitted by this Code shall be acceptable only if _____.
Answer 1: labeled
Answer 2: listed
Answer 3: approved
Answer 4: identified

Answer 35

Answer 3: approved

110.2

Question 36

In judging equipment considerations such as _____ shall be evaluated.
Answer 1: mechanical strength
Answer 2: wire-bending and connection space
Answer 3: arcing effects
Answer 4: all of these

Answer 36

Answer 4: all of these

110.3(A)(2), (3), and (6)

Question 37

In judging equipment considerations such as cybersecurity for network-connected ____ to address its ability to withstand unauthorized updates and malicious attacks while continuing to perform its intended safety functionality shall be evaluated.
Answer 1: normal equipment
Answer 2: emergency equipment
Answer 3: standby power equipment
Answer 4: life safety equipment

Answer 37

Answer 4: life safety equipment

110.3(A)(8)

Question 38

Product testing evaluation and listing (product certification) shall be performed by _____.
Answer 1: recognized qualified electrical testing laboratories
Answer 2: the manufacturer
Answer 3: a qualified person
Answer 4: an electrical engineer

Answer 38

Answer 1: recognized qualified electrical testing laboratories

110.3(C)

Question 39

Conductor sizes are expressed in American Wire Gauge (AWG) or in _____.
Answer 1: inches
Answer 2: circular mils
Answer 3: square inches
Answer 4: cubic inches

Answer 39

Answer 2: circular mils

110.6

Question 40

Completed wiring installations shall be free from _____ other than as required or permitted elsewhere in this Code.
Answer 1: short circuits
Answer 2: ground faults
Answer 3: any connections to ground
Answer 4: all of these

Answer 40

Answer 4: all of these

110.7

Question 41

Equipment intended to interrupt current at _____ levels shall have an interrupting rating at nominal circuit voltage at least equal to the available fault current at the line terminals of the equipment.
Answer 1: fault
Answer 2: overcurrent
Answer 3: overload
Answer 4: incident energy

Answer 41

Answer 1: fault

110.9

Question 42

The _____ and other characteristics of the circuit to be protected shall be selected and coordinated to permit the circuit protective devices used to clear a fault to do so without extensive damage to the electrical equipment of the circuit.
Answer 1: overcurrent protective devices
Answer 2: total impedance
Answer 3: equipment short-circuit current ratings
Answer 4: all of these

Answer 42

Answer 4: all of these

110.10

Question 43

Equipment not _____ for outdoor use and equipment identified only for indoor use such as dry locations or indoor use only shall be protected against damage from the weather during construction.
Answer 1: listed
Answer 2: identified
Answer 3: suitable
Answer 4: marked

Answer 43

Answer 2: identified

110.11

Question 44

Some _____ can cause severe deterioration of many plastic materials used for insulating and structural applications in equipment.
Answer 1: cleaning and lubricating compounds
Answer 2: protective coatings
Answer 3: paints and enamels
Answer 4: detergents

Answer 44

Answer 1: cleaning and lubricating compounds

110.11 Informational Note 2

Question 45

Internal parts of electrical equipment including busbars wiring terminals insulators and other surfaces shall not be damaged or contaminated by foreign materials such as _____ or corrosive residues.
Answer 1: paint plaster
Answer 2: cleaners
Answer 3: abrasives
Answer 4: any of these

Answer 45

Answer 4: any of these

110.12(B)

Question 46

Connectors and terminals for conductors more finely stranded than Class B and Class C as shown in Chapter 9 Table 10 shall be _____ for the specific conductor class or classes.
Answer 1: listed
Answer 2: approved
Answer 3: identified
Answer 4: all of these

Answer 46

Answer 3: identified

110.14

Question 47

Conductors of dissimilar metals shall not be intermixed in a terminal or splicing connector where physical contact occurs between dissimilar conductors unless the device is _____ for the purpose and conditions of use.
Answer 1: identified
Answer 2: listed
Answer 3: approved
Answer 4: designed

Answer 47

Answer 1: identified

110.14

Question 48

Connection of conductors to terminal parts shall ensure a mechanically secure electrical connection without damaging the conductors and shall be made by means of _____.
Answer 1: solder lugs
Answer 2: pressure connectors
Answer 3: splices to flexible leads
Answer 4: any of these

Answer 48

Answer 4: any of these

110.14(A)

Question 49

Tightening torque values for terminal connections shall be as indicated on equipment or in installation instructions provided by the manufacturer. An approved means shall be used to achieve the_____ torque value.
Answer 1: indicated
Answer 2: identified
Answer 3: maximum
Answer 4: minimum

Answer 49

Answer 1: indicated

110.14(D)

Question 50

Examples of approved means of achieving the indicated _____ values include torque tools or devices such as shear bolts or breakaway-style devices with visual indicators that demonstrate that the proper torque has been applied.
Answer 1: pressure
Answer 2: torque
Answer 3: tightening
Answer 4: tension

Answer 50

Answer 2: torque

110.14(D) Informational Note 1

Question 51

Electrical equipment such as switchboards switchgear enclosed panelboards industrial control panels meter socket enclosures and motor control centers which are in other than dwelling units and are likely to require _____ while energized shall be field or factory marked to warn qualified persons of potential electric arc-flash hazards.
Answer 1: examination
Answer 2: adjustment
Answer 3: servicing or maintenance
Answer 4: any of these

Answer 51

Answer 4: any of these

110.16(A)

Question 52

In other than dwelling units a permanent arc-flash label shall be field or factory applied to service equipment and feeder supplied equipment rated _____ or more.
Answer 1: 600A
Answer 2: 1000A
Answer 3: 1200A
Answer 4: 1600A

Answer 52

Answer 2: 1000A

110.16(B)

Question 53

NFPA 70E Standard for Electrical Safety in the Workplace provides specific criteria for developing arc-flash labels for equipment that provides _____ and so forth.
Answer 1: nominal system voltage and incident energy levels
Answer 2: arc-flash boundaries
Answer 3: minimum required levels of personal protective equipment
Answer 4: all of these

Answer 53

Answer 4: all of these

110.16(B) Informational Note 2

Question 54

Electrical equipment servicing and electrical preventive maintenance shall be performed by _____ trained in servicing and maintenance of equipment.
Answer 1: qualified persons
Answer 2: manufacturer’s representatives
Answer 3: service specialists
Answer 4: licensed individuals

Answer 54

Answer 1: qualified persons

100.17(1)

Question 55

Equipment servicing and electrical preventive maintenance shall be performed in accordance with the original equipment manufacturer’s instructions and _____.
Answer 1: information included in the listing information
Answer 2: applicable industry standards
Answer 3: as approved by the authority having jurisdiction
Answer 4: any of these

Answer 55

Answer 4: any of these

110.17(1)

Question 56

Equipment that is reconditioned and required by the Code to be listed shall be listed or _____ as reconditioned using available instructions from the original equipment manufacturer.
Answer 1: identified
Answer 2: documented
Answer 3: field labeled
Answer 4: certified

Answer 56

Answer 3: field labeled

110.20(A)

Question 57

Where caution warning or danger hazard markings such as labels or signs are required by this Code the markings shall be of sufficient durability to withstand the environment involved and warn of these hazards using effective _____.
Answer 1: words
Answer 2: colors
Answer 3: symbols
Answer 4: any combination of words colors or symbols

Answer 57

Answer 4: any combination of words colors or symbols

110.21(B)(1)

Question 58

Each disconnecting means shall be legibly marked to indicate its purpose unless located and arranged so _____.
Answer 1: that it can be locked out and tagged
Answer 2: it is not readily accessible
Answer 3: the purpose is evident
Answer 4: that it operates at less than 300 volts-to-ground

Answer 58

Answer 3: the purpose is evident

110.22(A)

Question 59

When service equipment is required to be field marked with the available fault current the value of available fault current for use in determining appropriate minimum short-circuit current ratings of service equipment is available from _____ in published or other forms.
Answer 1: the architect
Answer 2: the engineer
Answer 3: electric utilities
Answer 4: all of these

Answer 59

Answer 3: electric utilities

110.24(A) Informational Note 2

Question 60

When modifications to the electrical installation occur that affect the available fault current at the service the available fault current shall be verified or _____ as necessary to ensure the service equipment ratings are sufficient for the available fault current at the line terminals of the equipment.
Answer 1: recalculated
Answer 2: increased
Answer 3: decreased
Answer 4: adjusted

Answer 60

Answer 1: recalculated

110.24(B)

Question 61

If a disconnecting means is required to be lockable open elsewhere in the NEC it shall be capable of being locked in the open position. The provisions for locking shall remain in place with or without _____.
Answer 1: the power off
Answer 2: the lock installed
Answer 3: supervision
Answer 4: a lock-out tag

Answer 61

Answer 2: the lock installed

110.25

Question 62

_____ and access to and egress from working space shall be provided and maintained about all electrical equipment to permit ready and safe operation and maintenance of such equipment.
Answer 1: Ventilation
Answer 2: Unrestricted movement
Answer 3: Circulation
Answer 4: Working space

Answer 62

Answer 4: Working space

110.26

Question 63

Access to or egress from the required working space about electrical equipment is considered impeded if one or more simultaneously opened equipment doors restrict working space access to be less than _____ wide and 6½ ft high.
Answer 1: 24 in.
Answer 2: 28 in.
Answer 3: 30 in.
Answer 4: 36 in.

Answer 63

Answer 1: 24 in.

110.26

Question 64

NFPA 70E Standard for Electrical Safety in the Workplace provides guidance such as determining severity of potential exposure planning safe work practices including establishing an electrically _____ work condition arc-flash labeling and selecting personal protective equipment.
Answer 1: safe
Answer 2: efficient
Answer 3: grounded
Answer 4: bonded

Answer 64

Answer 1: safe

110.26(A) Informational Note

Question 65

Working space distances for enclosed live parts shall be measured from the _____ of equipment if the live parts are enclosed.
Answer 1: enclosure or opening
Answer 2: front or back
Answer 3: mounting pad
Answer 4: footprint

Answer 65

Answer 1: enclosure or opening

110.26(A)(1)

Question 66

The minimum working space on a circuit for equipment operating at 120V to ground with exposed live parts on one side and no live or grounded parts on the other side of the working space is _____.
Answer 1: 1 ft
Answer 2: 3 ft
Answer 3: 4 ft
Answer 4: 6 ft

Answer 66

Answer 2: 3 ft

110.26(A)(1) and Table 110.26(A)(1) Condition 1

Question 67

The required working space for access to live parts of equipment operating at 300V to ground where there are exposed live parts on one side and grounded parts on the other side is _____.
Answer 1: 3 ft
Answer 2: 3½ ft
Answer 3: 4 ft
Answer 4: 4½ ft

Answer 67

Answer 2: 3½ ft

110.26(A)(1) and Table 110.26(A)(1) Condition 2

Question 68

The required working space for access to live parts of equipment operating at 300V to ground where there are exposed live parts on both sides of the workspace is _____.
Answer 1: 3 ft
Answer 2: 3½ ft
Answer 3: 4 ft
Answer 4: 4½ ft

Answer 68

Answer 3: 4 ft

110.26(A)(1) and Table 110.26(A)(1) Condition 3

Question 69

Working space is not required at the back or sides of equipment where all _____ and all renewable adjustable or serviceable parts are accessible from the front.
Answer 1: screws
Answer 2: connections
Answer 3: bolts
Answer 4: doors

Answer 69

Answer 2: connections

110.26(A)(1)(a)

Question 70

The width of the working space shall be not be less than _____ wide or the width of the equipment whichever is greater.
Answer 1: 15 in.
Answer 2: 30 in.
Answer 3: 40 in.
Answer 4: 60 in.

Answer 70

Answer 2: 30 in.

110.26(A)(2)

Question 71

The minimum height of working spaces shall be clear and extend from the grade floor or platform to a height of _____ ft or the height of the equipment whichever is greater.
Answer 1: 3 ft
Answer 2: 6 ft
Answer 3: 6½ ft
Answer 4: 7 ft

Answer 71

Answer 3: 6½ ft

110.26(A)(3)

Question 72

The grade floor or platform in the required working space about electrical equipment shall be as level and flat as _____ for the entire required depth and width of the working space.
Answer 1: practical
Answer 2: possible
Answer 3: required
Answer 4: none of these

Answer 72

Answer 1: practical

110.26(A)(6)

Question 73

Working space required by Section 110.26 shall not be used for _____.
Answer 1: storage
Answer 2: raceways
Answer 3: lighting
Answer 4: accessibility

Answer 73

Answer 1: storage

110.26(B)

Question 74

When normally enclosed live parts are exposed for inspection or servicing the working space if in a passageway or general open space shall be suitably _____.
Answer 1: accessible
Answer 2: guarded
Answer 3: open
Answer 4: enclosed

Answer 74

Answer 2: guarded

110.26(B)

Question 75

For large equipment that contains overcurrent devices switching devices or control devices there shall be one entrance to and egress from the required working space not less than 24 in. wide and _____ high at each end of the working space.
Answer 1: 5½ ft
Answer 2: 6 ft
Answer 3: 6½ ft
Answer 4: 7 ft

Answer 75

Answer 3: 6½ ft

110.26(C)(2)

Question 76

For equipment rated 800A or more that contains overcurrent devices switching devices or control devices; and where the entrance to the working space has a personnel door(s) less than 25 ft from the nearest edge of the working space the door shall open at least 90° _____.
Answer 1: in or out with simple pressure and shall not have any lock
Answer 2: in the direction of egress and be equipped with listed panic or fire exit hardware
Answer 3: and be equipped with a locking means
Answer 4: and be equipped with an electronic opener

Answer 76

Answer 2: in the direction of egress and be equipped with listed panic or fire exit hardware

110.26(C)(3)

Question 77

Illumination shall be provided for all working spaces about service equipment switchboards switchgear enclosed panelboards or motor control centers _____.
Answer 1: over 600V
Answer 2: installed indoors
Answer 3: rated 1200A or more
Answer 4: using automatic means of control

Answer 77

Answer 2: installed indoors

110.26(D)

Question 78

A dropped suspended or similar ceiling that does not add strength to the building structure shall not be considered a _____ ceiling.
Answer 1: structural
Answer 2: FALSE
Answer 3: real
Answer 4: drop

Answer 78

Answer 1: structural

110.26(E)(1)(d)

Question 79

All switchboards switchgear panelboards and motor control centers located outdoors shall be _____.
Answer 1: installed in identified enclosures
Answer 2: protected from accidental contact by unauthorized personnel or by vehicular traffic
Answer 3: protected from accidental spillage or leakage from piping systems
Answer 4: all of these

Answer 79

Answer 4: all of these

110.26(E)(2)(a)(1), (2), and (3)

Question 80

A NEMA Type 1 enclosure is approved for the environmental condition where _____ might be present.
Answer 1: falling dirt
Answer 2: falling liquids
Answer 3: circulating dust
Answer 4: settling airborne dust

Answer 80

Answer 1: falling dirt

110.28 and Table 110.28

Question 81

Enclosures of switchboards switchgear or panelboards that may become ice covered where exposed to sleet may be installed in a _____ enclosure.
Answer 1: Type 3 or 3R
Answer 2: Type 3X or 3RX
Answer 3: Type 3S or 3SX
Answer 4: Type 4 or 4X

Answer 81

Answer 3: Type 3S or 3SX

110.28 and Table 110.28

Question 82

Enclosure Type 3X for switchboards switchgear or panelboards located outdoors are suitable in locations subject to _____.
Answer 1: rain
Answer 2: windblown dust
Answer 3: corrosive agents
Answer 4: any of these

Answer 82

Answer 4: any of these

110.28 and Table 110.28

Question 83

A Type 4X enclosure for switchboards switchgear or panelboards located indoors is suitable in locations subject to the environmental condition of _____.
Answer 1: falling dirt
Answer 2: falling liquids
Answer 3: corrosive agents
Answer 4: any of these

Answer 83

Answer 4: any of these

110.28 and Table 110.28

Question 84

The term rainproof is typically used in conjunction with enclosure type(s) _____.
Answer 1: NEMA 3
Answer 2: NEMA 3R and 3RX
Answer 3: NEMA 4
Answer 4: NEMA 4R and 4RX

Answer 84

Answer 2: NEMA 3R and 3RX

Table 110.28 Informational Note 1