IEC exam 2
How much current will this bathroom vanity luminaire draw when connected to a 120-volt branch circuit? Each lamp has a rating of 60 watts at 120 volts.
12
Refer to Figure 115. 346. When the sterilization unit is connected to a 480-volt circuit, what is the voltage dropped across each element?
120
See Figure 115. 346. How many amps of circuit current will the sterilizer draw?
14.2 amps
IDCI is an abbreviation for what?
Immersion Detection Circuit Interrupter
SPST is an abbreviation for what?
Single Pole-Single Throw
The neutral conductor of a 120-volt circuit is referred to as what kind of conductor in the NEC?
grounded
What conductor in a circuit can be marked with a green color?
only equipment grounding
Fluorescent ballasts contain thermal protectors that will open the circuit (disconnect power) to prevent what?
overheating
Overheating of luminaires which often results in fires is most often caused by what?
overlamping, and burying recessed luminaires under thermal insulation
The ____ of light determines the color that is visible
wavelength
A receptacle is to be installed on the roof of a doctor's office building. Is this receptacle required to be GFCI protected?
yes
Are outdoor luminaires permitted to be attached to living trees?
yes
Can light that is violet in color be seen by the human eye?
yes
Does the NEC permit an MC cable that is 46 feet in length and properly secured to be installed between a 4" -square box and a 2-by-4 lay-in luminaire?
yes
Will operating a fluorescent lamp that has severe blackening on one end damage the ballast?
yes
The NEC requires that receptacles be installed so that the grounding slot is located on what side of the receptacle?
(neither) no NEC requirement
Refer to Figure 112.226. After removing the receptacle from its package, you are going to check it with an ohmmeter. If the leads of the ohmmeter are placed between Points G and C, how many ohms should the meter indicate?
0 (or close to zero)
Class A GFCIs are designed to trip when a fault of about how many amps occurs?
0.006 amps
Refer to the illustration of the FBU and the information shown with Figure 115.342. What is the "hot" resistance of Element 3 (R3) in ohms?
1.3951
Which Article of the NEC defines a bathroom?
100
Refer to the pictorial circuit shown in Figure 115.315. If the leads of a voltmeter were placed on L1 and L2 on the upper element, how many volts should the meter indicate?
104
How many number 10 AWG conductors may be installed in a 4 11/16 x 2 1/8 " square box that already contains six-12 AWG conductors?
11
What is the current in a circuit if the voltage applied to a load is 492 volts? the connected load contains two series-connected resistive heating elements that are EACH rated for 2.8 KW at 250 volts
11.02 A
Although not limited by the NEC, if a 15-amp residential circuit is to be loaded only up to its rating, how many outlets can be put on the 120-volt circuit if the outlets are rated at 120 VA per outlet?
15
How many 10 AWG conductors may be installed in a 4 11/16 x 2 1/8" square box?
16
Refer to Figure 110.14. Using Ohms law (Table 8, Chapter 9), what is the voltage applied to the load? The circuit conductors are #6 uncoated THHN/THWN stranded copper. The circuit current is 14.4 amps. The load is located 898 feet away from the breaker panel where the voltage is 209 volts line-to-line
196
The fewest number of 20-amp kitchen countertop receptacle circuits that are permitted to be installed in a kitchen in a house is ______.
2
U-shaped fluorescent lamps are primarily used in ______ luminaires
2' x 2'
Refer to the illustration of the FBU and the information shown with Figure 115.342. When operated at exactly 240 volts, what is the actual power used by Element 4 (P4) in kW?
2.580
What Section in the NEC specifies the number of receptacles to be installed along a kitchen countertop in a house?
210.52(C)(1)
What is the Code reference that specifies the required number of receptacles in a dwelling hallway?
210.52(H)
Refer to Figure 116. 109. The plans require that the outside receptacle for this dwelling be GFCI-protected. What is the Code reference(s) for this requirement?
210.8(A)(3)
Refer to Figure 115.104. What is the minimum volume required for this box? The Type NM cables each contain grounds. The "pigtails" to the receptacle are #12 wires. As you can see, the cable connectors are external. A flat (0.0 in^3 volume) p-ring is used
25.5
If a ballast is rated to operate at 277 volts but can tolerate (without damaging effects) a +5% to a -7% variation from this rated voltage, then what is the acceptable voltage range?
290, 258
How many screw terminals does a single-pole, double throw switch have for the connection of current-carrying circuit conductors?
3
Refer to Figure 115.104. Each of the Type NM cables contains a ground. What is the minimum depth 2-gang masonry box that could be used here? You will install a second receptacle in this box. The second receptacle is NOT shown. The "pigtails" to both of the receptacles are #12 wires. As you can see, the cable connectors are external.
3 1/2
Refer to Figure 117.202. When all the luminaires are operating, how many amps are flowing in each circuit conductor in Cable F?
3.4
In a bathroom in a house, at least one receptacle must be installed within _____ of the outside edge of each basin, and this receptacle must be located on the wall or partition adjacent to the basin
36 inches (3 ft)
For the connection of current-carrying conductors, how many screw terminals does a DPST (double-pole, single-throw) switch have?
4
The Code reference that requires luminaires installed in specific locations (such as wet, damp, or dry) to have markings identifying the luminaire as suitable for that location is ______.
410.10(A)
The 3-gang masonry box shown in Figure 107. 458 will have several EMT conduits connected to it. The EMT will be the equipment grounding conductor - NO ground wires will be pulled in. The box will contain three 4-way switches. Twelve "travelers are pulled into the box along with two other circuit conductors. All conductors are 12 AWG copper THHN/THWN. What is the minimum volume the box must have?
45 in^3
How many number 12 AWG conductors may be installed in a 4" x 2 1/8" x 1 7/8" device box?
5
In a bathroom, exposed non-current-carrying metal parts shall be connected to an equipment grounding conductor if they are within ______ horizontal feet of a grounded surface or object
5
Although there are few exceptions for AC systems that supply premises wiring, the NEC generally requires that systems operating at how many volts be grounded
50 - 1,000 volts
A surface-mounted fluorescent luminaire mounted in a clothes closet must maintain a clearance of at least how many inches to the storage area?
6
AFCI is an abbreviation for what?
Arc Fault Circuit Interrupter
Refer to Figure 117.301. Which diagram shows Receptacle 1 to be GFCI protected and Receptacle 2 to be NOT protected?
Diagram 1
LED light sources are substantially different because they operate using what kind of current?
Direct Current
Refer to Figure 113.513. Which is a single receptacle (NO special functions)?
Drawing 3
GFCI is an abbreviation for what?
Ground Fault Circuit Interrupter
Resistance in a series circuit of three resistive elements uses which formula?
RT = R1 + R2 + R3
Although a box has been selected to meet the minimum volume requirements of the NEC, the box may be too small to accommodate the device installation without damage to the wiring. What section in the NEC addresses this potential problem?
Section 314.24
Section 210.8(A)(5) of the NEC states that a receptacle located where in a house shall be GFCI protected
a finished basement, an unfinished basement, a workroom in an unfinished basement
When giving someone's vehicle a "jump start" using jumper cables, what is the last connection made to?
a grounded surface in the vehicle with the "dead" battery
What are the essentials of good housekeeping?
all of the above
An AFCI breaker is used because it detects what?
an arcing condition
A bathroom is defined as an area including a basin, with one or more of the following:
any of these
Ceiling suspended (paddle) fan speed can be controlled by what?
any of these
GFCI protection can be provided for receptacles serving kitchen countertop areas in a dwelling by installing what?
any of these
In a suspended ceiling system, lay-in luminaires shall be securely fastened to the ceiling framing member by mechanical means such as what?
any of these
Power tool cords should be kept away from what?
any of these
Where should ballasts be disposed of?
at a hazardous waste incinerator or at a chemical waste landfill
Which of the connection diagrams shown below is wired to operate correctly so that the lamp can be controlled from any switch and the markings on the white conductors do not violate NEC 200.7? Future wall access is available as required in NEC 404.2(C)(2).
b. white with purple tape, white with pink tape, white with brown tape
Partially protected areas, such as under the roof of the open front porch of a house are considered ______ locations according to the NEC
damp
What conductor in a circuit cannot be marked with a color of white or gray?
equipment grounding and ungrounded
Refer to the legend and partial wiring plan in Figure 116.201. The wiring method used is 12 AWG wire installed in EMT. A separate equipment grounding conductor is not required for this installation. A 4 11/16 x 1 1/2 inch square metal box with a 2-gang plaster ring is to be installed as the box assembly. What is the minimum cubic inch capacity of the plaster ring that will be installed on the box?
flat (or 0.0)
If you need more than two switches to control a light, you will need at least one what?
four-way switch
A GFCI receptacle is energized and another receptacle is supplied from the load side connections on the GFCI. On the downstream receptacle if you touch the "hot" with one hand and the __________ with the other hand, the GFCI will trip
ground terminal
what is the ungrounded conductor often called?
hot
What kind of gas do car batteries produce?
hydrogen
Fluorescent lamps will have a longer life (in hours) if what is done?
if they are left "on" for long periods of time
A standard incandescent dimmer can be used to control which kind of load?
incandescent lighting
Luminaire is a term that refers to_____.
incandescent lighting fixtures, fluorescent lighting fixtures, and outdoor pole-mounted fixtures
Refer to Figure 112.225. After removing the receptacle from its package, you are going to check it with an ohmmeter. If the leads of the ohmmeter are placed between points D and G, how many ohms should the meter indicate?
infinity (or OL on a digital meter)
Do incandescent lamps produce more light per watt than HID lamps?
no
Refer to Figure 112.512. The lamp on the right is to be ON constantly (as a night light) and the lamp on the left is to be controlled from the switch. Which of the connection diagrams is wired to operate correctly and does not violate 200.7 in the NEC? Type AC 12-2 and 12-3 cables are used between the outlet boxes. Future wall access is avilable as required in NEC 404.2(C)(2).
none of these
Refer to Figure 117.301. Which of the receptacles are rated at 20 amps?
none of these
How must a luminaire be marked that is installed outside, exposed to the weather?
suitable for wet location
What is the negative terminal on a betty generally connected to?
the vehicle frame
The National Electric Code does not address the issue of "spill lighting" or "light pollution" from one property to another because unwanted illumination is not a safety issue, and the NEC is a safety standard. However, building codes sometimes have rules on this subject.
true
Some portable appliances use double insulation in place of grounding to provide shock protection to users. Double-insulated appliances normally have ______ power cords and attachment plug caps
two-wire
The "hot" conductor of a circuit is referred to as what kind of conductor in the NEC?
ungrounded