Year 2 IEC MID-TERm
the primary purpose of bonding metal equipment enclosures, metal raceways, andthe grounded power supply together is to ______. -1. cause the quick operation of OCPDs -2. keep all metal parts at the same voltage -3. limit voltage surges
1 only
Which of the following THHN/THWN copper conductors is the smallest size permitted for a feeder where a 150 A breaker protects the feeder ? The feeder originates in the 120,240-volt,1-phase, 3-wire service panel in a baker.
1/0
Where lightning rods are installed on BCES for pole lighting,the rod is to be 3/4'' x _______.
10f
Article 220 requires that each single or multiple receptacle on a single strap be calculated at ____ VA.
180
The interior of any dip or coating tank of a flammable liquid is considered to be a _____ location.
a Class 1, Division 1
As referenced in the NEC at 300.6 (A) and 300.20 (B), the Code frequently distinguisges between ferrous and nonferrous metals because nonferrous metals ______. -A. have magnetic properties -B. are more likely to corrode than nonferrous metals
a and b
FPU-5-4 in BCES Room B141 is connected to circuit ______ in Panel ____.
21-HE
The conduit(s) installed between the BCES' MSB and the utility transformer is (are) trade size ______.
4
Refer to the BCES panel schedule for Panel LB1 Section #1. If we have a homerun conduit with circuits LB1-1,3, and 5, there will be a total of ______ conductors in this conduit entering the panel.
7
The NEC permits the insulation for an ungrounded conductor to be ____ in color. -orange -black -brown -yellow
any of these
The feeder neutral load is the maximum unbalance between ______.
any one of the ungrounded conductors and the grounded conductor
Which 2 awg conductor has a higher resistance? -Aluminum -Copper
Aluminum
Circuit ______ serves the entrance lights at the east entrance of the BCES Area A.
HL-3
A DMM is set for a voltage measurement and the range is set to 200v. If the voltage to be measured is 277 volts, the LCD will display_____.
OL
In vertical conduit runs, such as up through a high-rise building , conductors made of aluminum have support requirements that are ______ than for copper conductos.
farther apart
Except for listed explosionproof equipment with factory threaded entries, all National Standard Pipe Taper threaded conduit entries into explosionproof equipment and threaded in the field shall have at least _______ threads fully engaged.
five
When installing a 19-inch long piece of conduit between two panelboards, ________.
the conduit can be filled with wire to 60% of its area
in a commercial garage where a 125 volt convenience receptacle is installed above a workbench, the NEC requires that the receptacle be GFCI protects. T/F
true
regardless of circuit rating, whenever flexible metal conduit is used to connect a motor, a seperate grounding conductor is required to be installed with the flex. T/F
true
In a class 2 location, ventilating pipes for generators shall be of metal not less than _______ inches in thickness or of equally substantial noncombustible material.
.021 in
On the BCES project, the conductors installed between the MSB and the disconnect switch for Chiller Ch-1 contains ____ equipment grounding conductors.
1 each 1 awg.
On the BCES project, each conduit installed between the MSU and Panel HK contains ______ grounded circuit conductors.
1 each 3/0 awg
Locations within ________, in all directions, from a liquefied natural gas dispenser enclosure are classified as a Class 1, Division 1 locations.
1.5 m ( 5ft)
What is the smallest size copper wire permitted to be used as a main bonding jumper in a 400-A main breaker panelboard? The panel is fed from a transformer a single conduit containing four 500 kcmil conductors.
1/0 awg
For BCES, the minimum size galvanized threaded rod that can be used to support suspended transformers is _____ -inch
1/2
The smallest trade size IMC available that can be installed between to big pull boxes is ______.
1/2
You are to surface mount 39' of 12-2 cable on a wall between two boxes as shown. You will use 1-hole straps to securely fasten the cable to the wall. The minimum number of straps required is ______.
19
Which of the following raceways are permitted to be installed in pole bases on BCES? -1. schedule 80 PVC -2.RMC -3. IMC
2 only
The compressor nameplate reads: 240 V 3 Phase 60 HZ. Which of the following safety switches is permitted to be used as the disconnecting means for the air compressor. -250-volt, 2-Pole -600-volt, 3 pole -250-volt, 3 Pole
2 or 3 only
On the BCES project, the electrical service size is _____ amperes.
2,500
On the BCES project, the conductors installed between the MSB and CH-1 disconnect include _____
2-1 awg
The combination safety switch/ motor starter, installed for BCES AHU-4, contais a NEMA Size _____ starter and ____- Amp fuses.
2-40
No more than ______ 250 kcmil THHN/THWN conductors can be installed in a section of trade size 4 IMC that is installed between two pull boxes that are 15" apart.
20
On the BCES print MEP1.1, the telephone company requires _______ underground conduits.
3-4"
The NEC states that contact of dissimilar metals be avoided where practicable. The Code reference that specifically permits steal threaded rigid couplings to be used with aluminum rigid metal conduit is _____.
344.14
On the BCES project, there will be a total of _______ 3" conduits connected to the main switchboard.
4
"Unless noted otherwise" and "Unless Otherwise Noted" are notations used on construction drawings. These abbreviated UNO and UON, respectively. The abbreviation used on the BCES E-Drawing is _____.
UON
The symbol of abbreviation used for the unit of measurement for the answer (VOLTS)
V
______ equipment is constructed so that water ( in the form of moisture) will not enter it.
Watertight
The Code reference for GFCI protection of receptacles in commercial garages is found at ______.
511.12
The distance required between the lightning protection at the BCES parking lot pole bases.
6 awg copper-clad stranded
To serve a 60-amp, 3-phase load, 6 awg conductors are connected to a 3-pole breaker in a panel. The three wires are installed in a conduit that passes through a n area where the temperature is 124F. The largest breaker that can be installed for this circuit is a ____ amp.
60
ON the BCES project, the conductors installed betweenthe main switchboard and the manual transfer switch include a _____ awg equipment grounding conductor.
8
Which of these wiring methods is NOT permitted to be used for service-entrance conductors? -A. RMC -B. LFNC -C.AC cable _D.ENT
AC cable
Safety toe footwear for employees shall meet the requirements and the specifications of _____.
ANSI
Where one or more complete paragraphs from the previous edition of the NRC have been deleted in the current edition, the deletion is identified by ____ between the remaining paragraphs.
a bullet
Buried raceways and cables under Class 1 locations in bulk storage plants shall be considered to be within a _____ locations.
Class 1 , Zone 1
Electrical wiring that is installed in and under aircraft hangar floors shall comply with the requirements for a ____ location
Class 1, Division 1
Employees shall maintain any saftey data sheets (SDS) for hazardous _____.
chemicals
During periods of maintenance and service, fuel-dispensing devices are required to provide means to remove _____ voltage sources.
external
A junction box _____ required where cables, suitable for direct burial are spliced underground. is/ is not
is not
The water pump motor for a coin-operated car wash would be considered to be a _____ load.
noncontinuous
Within Class 1 hazardous locations, conduit seals are utilized to _____
prevent the ignition of flammable vapors on the outside of the conduit systems
On the BCES drawings E1.1 where ther is concealed electrical equipment, you are required to _____.
provide an access door
Typically, OCPDs are connected in _____ with the circuit conductors. -Series -Parallel
series
Where non-metallic sheathed cable is used for underground wiring in a bulk storage plant, an equipment grounding conductor ____ electrical continuity of the raceway system and the grounding of all con current carrying metal parts.
shall be included to provide
Where compressed natural gas dispensers are located under a canopy or enclosure that prevents the accumulation or entrapment of ignitable vapors, electrical equipment_______.
shall not be required to meet class 1, division 2 hazardous location requirements.
On the BCES project at the parking lot light pole base, the connection made between the ground wire and ground rod is permitted to be a ______ type.
thermoweld
A branch circuit serving a load is protected with 40- amp fuses in a 60-A safety switch. The branch circuit has a rating of ____ amps.
40
What size fuses are to be installed in the safety switch for the BCES Chiller?
450-amp
In each conduit seal in Class 1,Division 1 and hazardous locations, the compound thickness must be at least ______.
5/8 inch
Per the NEC which of the following bends are permitted in a conduit run between two junction boxes? -A. two 90.s plus one 45 three-point saddle plus one - 12 offset -B. one back to back 90 plus two 60 3-point saddles -C. two 30 offsets plus 3 90s
A
For spraying operations confined to an enclosed spray booth or room, the space within _____ in all directions from any openings shall be considered Class 1 Division2 or Class 2 division 2 locations
915 mm(3ft)
The concret-encased electrode needsto be installed early in the construction process, before walls have been built or the floor slab poured. the most practical place to install the concrete-encased electrode would be the ______. ( refer to BCES drawings)
East footer in room 154
General lighting loads for dwelling units are calculated at ____ VA per square foot.
3
The maximum permissible noise exposure level, at 97 db, is _____ hours.
3
You are going to pull in five dedicated branch circuits into one metal conduit. Each circui supplies power to a 120-volt load. The ungrounded conductors will be connected to breakers 2,4,6,8&10 in a 120/240-volt, single phase , 3 wire panel board. Per the NEC, the fewest number of neutral conductors you can install for the branch circuit is ______.
3
On the BCES project, the minimum permitted trade size rigid metal conduit is ____ inch.
3/4
A service is to be built on the base support pole of a two-sided billboard. Two 2-wire branch circuits provide power to the lights. Each circuit illuminates one side and will be loaded to 6 amps. The minimum ampacity for the ungrounded service conductors is _____ amps.
30
A service lateral is to be installed as direct-buried cable in the bottom of a trench that is 42 inches below finish grade. The trench is to be filled with dirt only. A warning ribbon is required to be installed in the trench at a maximum depth of ______ inches below finish grade.
30
How many 20-amp kitchen countertop receptacle circuits are required in a restaurant?
0
Which of the following services requires that a GFPE device be installed ? -1. 480/277,3 Phase, 4-wire 1200 A safety seitch with 800-A fuses. -2. 277/480 volt, 3 phase, 4-wire switchgear with a 1000-amp main breaker.. -3. 120/240 volt, 3 Phase, 4-wire 1200 Amp switchboard
1 and 2 only
The total calculated load for BCES is ____ kVA.
1,398
The minimum size THWN/THHN aluminum conductor permitted to serve a 95 amp load that will operate continuously is _____ awg.
1/0
Generally, The NEC permits a fuse to carry _____ percent of its rating where it supplies a load that is not operated continuously.
100
Stems of metal conduit for pendant luminaires in a Class 3, Division2 locations shall be braced against lateral displacement if the stems are longer than ______ inches.
12
Uninsulated exposed parts, suchas electrical conductors, buses, terminals, or components shall operate at not more than ______ volts in wet locations in Class 3, Divisions 1 and 2 locations.
15
In Class 1, Division 1 hazardous locations, enclosures containing apparatus require conduit seals. These seals shall be installed within _____- from such enclosures.
18 inches
A 175-amp breaker protects a feeder that originates in a 277/480 volt,3- phase, 4-wire service panel in a n office building. Which of the following conductors is the smallest size permitted for the feeder ?
2/0
A continuous load is any load that operates for _______.
3 hours or more
A 200- amp breaker protects a feeder that originates in a 120/240-volt, 3-phase, 4-wire service panel in a movie theatre. Which of the following THHN/THWN conductors is the smallest size permitted for the feeder?
3/0
In NEC Article 500.8, equipment marked for use in Class 1 locations and has a marked temperature classification of T3B is suitable for use in environments with a maximum surface temperature of _____.
329F
The maximum number of sets of service-entrance conductors that are permitted to be connected to a single service drop is ______ where the drop is to a strip center with four occupancies.
4
A 225-amp breaker protects a feeder that originates in a 120/208 volt, 3-phase, 4-wire service panel in a residence. Which of the following conductors is the smallest size permitted for the feeder?
4/0
On the BCES prject, Panel HK contains busbars that are rated at _____ amps.
400
In a class 2, division 1 location where a raceway provides communication between an enclosure that is required to be dust-ignition proof and one that is not, a vertical raceway not less than _______ feet long and extending downward from the dust-ignition proof enclosure is a suitable means to prevent the entrance of dust.
5 ft
Annex H in the NEC _____. -A. is to be used for information only unless specifically adopted by the local AHJ -B. contains requirments to be applied to all articles.
A
Which of the following are characteristics of THHN/THWN insulation? -A.- it is heat resistant -B.- It can be installed in wet,damp, or dry locations. -C- It is flame-retardant -D.-It is moisture resistant
A through D
The main telephone lines enter the BCES building in Room ____.
B145
In accordance with Nec section 500.6, flour mills and grain elevators contain atmospheres of comustible dusts that require equipment to be classified as ____.
Class 2, Group G
-Equipment 1- Operates for 3 hours, 20 minutes each time it is started. -Equipment 2- Operates for 1 hour, 15 minutes each time it is started. -Equipment 3- Operates for 45 seconds each time it is started. Equipment 2, shown above , is a continuous load. T/F
False
Which of the following installations are NOT covered by the NEC? -Bolivar ferry boats -Sprint towers used for cell phone signal transmission -Southwest Airlines Jets such as 737's -Reliant/HLandP power lines and equipment located in property easements along streets
None of the above
Where a service (meter and fused safety switch) is built on a rack that is located 200' from the building it serves, the rack is considered a structure per the NEC. T/F
True
Where circuit breaker terminals or safety switch lugs are marked on the equipment ( or included with installation instructions ) with a tightening torque by the manufacturer, this torque is required to be applied to the connections. T/F
True
Improper electrical terminations lead to increased _____. -A. Circuit resistance -B. voltage dropped across the terminations -C. Circuit current
a and b only
For a single-family dwelling with six appliance loads, demand factors may be applied to ___ of these loads using the standard calculation.
all six
A non-fused safety switch is permitted to be installed in which of the following locations? -A. a napkin and tablecloth storage room in a restaurant. -B. a mechanical room in a college -C. a coat closet in a house
any of these
Employees whose vision requires use of corrective lenses in spectacles shall be provided with eye protection in the form of _____. -A. optically corrected spectacles. -B. over-spectacle-type goggles - C. goggles with corrective lenses
any of these
A motor and the disconnecting means (safety switch) are located on opposite sides of a wall. Because the 8" concrete block wall separates two rooms, the two equipments are seperated by this 8". The motor and controller ____ considered to be within sight ( of eachother) per the NEC. ARE/ARE NOT
are not
Instantaneous trip circuit breakers can be installed ______
as a part of listed combination with a motor controller.
Employers shall provide employees with _____ information and training on hazardous chemicals in the work area at the time of their initial assignment.
effective
A bare _____ can be used as an equipment grounding conductor. - Busbar -wire
either 1 or 2
A building or structure can have a service separate from the main service where it supplies _____. -A. Fire Pump -B. A standby system
either a or b
When using the optional calculation method for dwelling units, this method considrs heating or A/C loads and ____ loads.
general
The circuit installed in a run of PVC conduit requires a 6 awg equipment grounding conductor. However, a 12 awg was installed instead. Using the 12 instead of the 6 awg wire will _____ the amount of time required for a circuit breaker to open when a ground fault occurs.
increase
In each conduit passing from a Class 1, Division 2 hazardous location into an unclassified location, _____ are permitted between the conduit seal and the point at which the conduit leaves the Division 2 location.
listed reducers
Where used in the NEC, the term shall not indicate that an actions is _____, An example of this usage appears below. 210.9 Circuits Derived from autotransformers. Branch circuits shall not be derived from auto transformers unless the circuit supplied has a grounded conductor that is electrically connected to a grounded conductor of the system supplying the auto transformer. -A.mandatory -B. permitted -C. allowed but not required
mandatory
When working on live or energized equipment, conductive _____ is permitted to be worn. - A. jewelry -B. clothing
neither a or b
Where 32 amps is flowing in the circuit conductors connected to a 30-amp breaker, this is an example of a(n)______.
overload
Providing a low impedance ground return path _____ when a ground fault occurs.
permits a high current to flow
Refer to NEC 500.8. Generally, equipment for use in hazardous locations shall be marked to show the environment for which it has been evaluated. Equipment that is not marked to indicate a division or is marked as Division 1 is ______.
suitable for both Divisions 1 and 2
For Classs 3 locations, Type MC, MI,TC or TC-ER cables installed in ventilated cable traays in a single layer shall have a space not less than ______ between two adjacent cables.
the diameter of the larger cable
The ampacity of an insulated conductor is ____.
the maximum amount of current it can carry continuously without damage to the insulation.
Demand Facror is defined as ______.
the ratio of the maximum demand of a system , or part of a system, to the total connected load of a system or the part of the system under consideration
A "gutter service" is built on the back of a strip shopping center. The service conductors enter a wireway from the utility. These are then tapped in the wire way to feed the meters. As shown in Figure 203.2, the conductors between the safety switch and the nail salon panel are permitted to be routed through the wireway______.
under no condition
The flex and fittings for a run from a disconnect to a motor are listed for grounding. The length of the FmC is 3.5 ft. Does the NEC require a separate EGC to be installed?
yes
A total of 12 current carrying conductors are installed in a conduit and the conduit passes through an area where the temperature is 122F. Included in these 12 conductors is a 3-wire circuit that serves a 50-amp, 3 phase load. These 3 conductors are to be connected to a 3 pole breaker in the panel. The smallest size wire that can be installed for the 3 phase load is _____ awg.
2
The compressor nameplate reads: 240 V, 1 phase, 60 HZ. Per the NEC, the minimum number of fuses that are to be installed in the fused safety switch.
2
the primary purpose of grounding metal equipment enclosures and metal raceways to the grounding electrode system (earth) is to _____. -cause the quick operation of OCPDs -keep all metal parts at the same voltage -limit voltage surges
2 and 3 only
On the BCES project, the conductors installed between the MSB and Panel HD include _____ equipment ground wires.
2- 2 awg
There are ____ chapters in the 2004 edition of the NFPA 70E.
4
______ kcmil grounded feeder conductors are installed in the conduits that are installed between the BCES building and the utility transformers.
500
What minimum size conductors are required to feed a 12.5 KW, 240-volt electric furnace operated at 240 volts? Size the conductors per 424.3(B). The branch-circuit OCPD is a circuit breaker that is rated for 75 degrees.
6
In a run of conduit , when couplings and connectors are loose this will ____ the amount of time required for a circuit breaker to open when a short-circuit occurs.
have no effect on
In commercial repair garages where electrical diagnositc equipment, electrical hand tools, or portable lighting equipment is used, GFCI protection is required for all _____ receptacles. -1. 125-volt, single-phase, 15 and 20 ampere -2. 250-volt,single-phasae, 30 ampere -3. 250-volt, three-phase, 15- and 20- ampere
1 only
The smallest size grounding electrode conductor connected to a Metal Underground Water Pipe from a 400-A, main breaker service panelboard is ______ awg. The service panelboard is fed with four 500 kcmil cu conductors.
1/0
The maximum number of 3/0 awg conductors that can be installed in a 18 foot long trade size 3 section of FMC that is installed between two equipment enclosures is _____.
10
The maximum surface temperature for motors in class 3 locations shall not exceed ____ degrees Celsuis.
120
The largest 1-pole circuit breaker that can be used to protect a 12 awf copper Type SJO flexible cord is _____-A.
25
Where major repair garages service vehicles that are fueled by lighter -than-air fuels such as natural gas or hydrogen, the area within _____ of the ceiling shall be considered unclassified where ventilation of at least 1 cfm/ft2 of ceiling area is provided.
18 inches
A 120/240v 3 phase 4-wire service panelboard is fed with four 350kcmil conductors. _______ awg or kcmil wire is the smallest GEC permitted for this installation.
2
For a 225-amp service where 4/0 awg service entrance conductors are installed, the smallest main bonding jumper permitted is _____ awg.
2
4 Square box with 5.2 cu in plaster ring will contain the following: (one) isolated ground receptacle (two) 12/2 with ground AC cables (BX) with exterior connectors (one) four-way switch (two)14/2 MC cables with exterior connectors. The receptacle is on a 20 amp circuit and the switch is for lighting connected to a 15 amp circuit the shallowest 4-square box you can use for this installation is 4" x 4" x ______.
2-1/8
A raceway has a total cross-sectional area of 6.258 square inches according to the table in Chapter 9 of the NEC. Where this conduit run will contain four conductors, the maximum area that can be occupied by the conductors is 40% or ______ in2
2.503
175-amp fuses are installed in the switch shown. The flex to the motor contains three 2 awg conductors. The minimum size of the equipment grounding conductor between the switch and the motor is _____ awg.
6
The depth of the 24" x 24" box, shown above, is 10 inches. Measured from the point in the box where the conductors emerge from the conduit, the minimum length of the conductors is _____ inches.
6
When setting the range on a DMM for a voltage measurement, if the expected voltage to be measured is 480 volts DC, the range setting should be set on_____.
600v---
A section of 10" x 10" wireway is shown. The maximum number of 4/0 awg THHN/THWN conductors that can be installed in the wireway is _____.
61
For application of Article 516, the interior of anhy open or closed container of a flammable liquid is considered to be a ____ locaiton.
Class 1, Zone 0
What type raceway for the BCES service feeder conductors is installed between the pad-mount transformer and the Texas New Mexico power distribution pole?
PVC
Heavy wall metal conduit is frequiently referred to as Heavy Wall,Rigid, Rigid galvanized Stell, Galvanized Rigid Conduit or Rigid Metal Conduit. The NEC utilizes the term Rigid Metal Conduit. In the BCEs prints, this conduit is referred to as _____.
RGS
A bare conductor can be used for a grounding electrode conductor whre it is installed between a service panel and a ground rod. T/F
True
Which of the following types of cable tray are permitted on the BCES job?
aluminum
All space in all directions outside of but within 900 mm( 3ft) of open containers , supply containers, spray gun cleaners and solvent distillation units containing flammable liquids are considered to be a _____ locations. -1. Class 1,Division 1 -2.Class 1 , Division 2 -3. Class 1, Zone 1
any of these
The chemical distributor, manufacturer, or importer shall ensure that each container of hazardous chemical leaving the workplace has the identity of the hazardous chemical _______. -A. labeled -.B tagged -C. marked
any of these
"S" loops _____ allowed for ground movement where service lateral conductors emerge from an underground raceway adjacent to a pad- mounted transformer. ARE/ARE NOT
are
Where a conduit passes through an exterior wall and enters a panel mounted on the interior, seals or plugs _____ required. Are/Are not
are
Where a 250 Kcmil copper GEC is subject to physical damage it _______.
can be run inside properly supported Schedule 80 PVC
Emergency controls to simultaneously disconnect motor - fueled- dispensing equipment at unatteded motor fuel dispensing facilities shall be located ______ from dispensers.
more than 6 m (20ft) but less than 30m (100ft)
A 4x4x4 NEMA 3 R box containing only splices is permitted to be supported by RMC where ______. -A. no more than 3' of RMC is stubbed out of the ground and enters the box -B. at least two RMCs enter the box on two sides
neither a or b
Where run outside on the wall of a building, a grounding electrode conductor to a metal water pipe shall be _______. A driveway runs along this wall. -1. at lest a 6 awg and supported -2. at least a 4 awg and supported -3. at least an 8 awg and in properly supported Schedule 80 PVC
none of these
On the BCES project, _____ conduit(s) is/are installed between the transformer and panel LB2.
one
Where schedule 80 PVC conduit is used for underground wiring in a bulk storage plant, an equipment grounding conductor _____ electrical continuity of the raceway system and the grounding of all non-current carrying metal parts
shall be included to provide
