IEC Chapter final Exam 135
A particular load is rated to use 2.2 KW at 240 volts this load is connected to a 2-pole breaker in a panel using 12 AWG conductors. How much current will this load draw?
9.2
Isolated ground receptacles are identified by _____.
an orange triangle
_____ lighting track is never permitted to be cut in the field.
portable
Metal signs operating at 120 volts and installed inside a fountain ______ required to be supplied by GFCI-protected circuits. ARE/ARE NOT
are
30 uA+= how many Amps
.00003
If the simple circuit in Figure 107.201 has 400 0hms of resistance and 100 volts applied what is its current flow?
.25
The outside diameter of a piece of conduit is 3.9375 inches and the inside diameter is 3.375 inches. The wall thickness of the conduit is _____ inches.
.28125
Common switch and outlet boxes are available with all the following size knockouts except for
3/8
On the EWR plans, ____ heat alarms are shown in the basement.
1
Re: EWR plans and specs. What is the horsepower rating of the water pump?
1
A mil is defined as_______ inches
1/1000
The nameplate on a single-phase motor indicated 115 volts. This motor is suitable for use on what ranges of voltage?
110 to 120
Permanently-wired radiant heaters shall be mounted at least how many feet vertically above the pool deck, unless otherwise apporoved /
12
When required to be grounded, the shield of a coax cable shall be grounded with atleast a size _____ AWG conductor according to NEC article 820.
14
EMT is installed on the roof of a building where the temperature is 119F. Fourteen current-carrying conductors are installed in the EMT. The 10 AWG circuit conductors that are installed in the EMT can carry _____ amps. Dont forget to use the 90 C column
16.4
How far will the company truck go in 2.75 hours traveling 65 mph?
178.75 miles
The water heater used in the EWR project is rated to pull _____ amps at rated voltage.
18.75
the EWR plan shows a total of _____ empty breaker spaces in Panel A.
2
According to the NEC Index, branch circuits are covered under in Articles _____.
210 and 220
Type UF cable installed under a parking lot must be buried atlest ____ inches deep
24
Article ______ in the NEC covers grounding and bonding of electrical systems.
250
The circular mil area of a 250 kcmil bare copper cable is ____ cmils
250,000
Branch circuit conductors must be rated at 90C if run within _____ inches of a ballast.
3
A clothes dryer with a nameplate rating of 7.8 KW at 240 volts will draw _____ amps of current when operated at 208 volts.
28.2
For a 100-amp, 120/240-V, 3W commercial service, ________ AWG copper conductors are the smallest permitted for the ungrounded conductors.
3
The code recommends a voltage drop no greater than ____ percent for feeders and no greater than _____ percent total for feeders and branch circuits together.
3 5
Single ladders longer than _____ feet should not be used.
30 feet
0 C = how many degrees Fahrenheit
32
Nec requirements for securing and supporting KNob-and-tube wiring are found in section
394.30
The Heat/vent/light in the EWR master bathroom requires how many switches according to the detail?
4
What size THWN copper conductors are required to supply a 15,000 watt, 240-volt furnace?
4 awg
Type AC cable shall be secured by staples, cable ties, straps, hangers, or similar fittings at intervals not exceeding _____ feet.
4.5
A light switch for underwater swimming pool lights must be located at least _____ feet horizontally from the inside edge of the pool.
5
Permanently-wired radiant heaters must be at least _____ feet from the inside edge of the pool,
5
Code article ______ covers temporary wiring.
590
The NEC requires that all receptacles, located withing ______ feet of the inside wall of the therapeutic tube, be GFCI protected.
6
Article ______ in the NEC addresses optional standby power systems.
702
When operated horizontally, the initial output of a 250 watt Multi-Vapor metal halide lamp is ____ lumens per watt
76.4
Six 20 watt, 12-volt luminaires are supplied from a small, 12-volt transformer that is 60 feet away from the fixtures. The wire used is 14 AWG. What is the voltage applied tot the fixtures?
8.61
Although not limited to 80% by the NEc, if a 15- amp residential circuit is to be loaded only up to 80% of its rating, how many luminaires with 150 watt lamps can be installed on the 120-volt circuit.
9
A Signaling Circuit is defined in _____ in the NEC
Article 100
Voltage is represented by the letter or symbol ________.
E
A ceiling fan that is located 13 feet above the level of the water in a n indoor spa and located directly above the spa is required to be GFCI protected T/F
False
Current is represented by the letter or symbol _______.
I
An equipment grounding conductor is the conductor that is _____.
Installed with the branch circuit conductors in a conduit or cable run.
Which of these is the Natioanl Fire Alarm and Signaling Code?
NFPA 72
As used in the NEC, SPD is an acronym for _____.
Surge Protection Device
Usually, load centers are not available with "bolt-on" circuit breakers? T/F
True
The NEC considers an installation inside a building to be a _____ location
dry
Improper torque can cause_____. I. injury or death II. Fasteners to prematurely wear or break III. overheating of electrical terminals
all of the above
When installing any audio/video/data cables, the cable runs should ______. I. be secure with rounded or depth-stop staples II. be bundled loosely with other cablesk III. not to be kinked or knotted
all of these
An AFCI breaker is used because it detects _____.
an arcing condition
Type ____ cord can be used on portable appliances. I. SP-2 II. SJ III. SO
any of these
The two 20-ampere small-appliance branch circuits required for the kitchen and dining room area are intended to supply____ appliance.
countertop
An equipment bonding jumper is the connection between two or more portions of the _____ conductor.
equipment grounding
In the international system of units, the prefix MILLI- means
one thousandth
What type of light fixture is located in front of the main electric panel?
pull switch
An extension ladder should extend a minimum distance above the top of a structure to be accessed and should be ______/
secured to the structure
A central electric furnace heating system is installed in a home. The furnace ______.
shall be connected to an individual branch circuit
In the international system of units, the prefix KILO- means _____.
thousand
Metal signs installed inside a fountain are required to be grounded. T/F
true
Adjacent to the master bedroom in a home is a dressing room containing a vanity with a sink and a mirror. Entry to a room containing a jacuzzi tub and a toilet is through a door from the dressing room. Are the dressing room and the jacuzzi room considered to be a bathroom by the NEC?
yes
The fewest number of 120-volt , 20-amp branch circuits you are permitted to install in a house to serve bathrooms is _____. The house has 3 bathrooms and the circuits will supply only bathroom receptacle.
1
A size ____ AWG equipment grounding conductor is contained in a nonmetallic-sheathed cable marked as 8 AWG.
10
What size breaker is feeding sub Panel B?
100-amp
Rounded off tot the nearest tenth, 103.49 is ____.
103.5
Table 300.5 in the NEc allows residentail,120-volt, 15-amp, underground circuits to be buried as shallow as _____ inches below grade rather than 24 inches when the circuit is GFCI protected.
12
Three 12 AWG circuit conductors that enter thorugh one conduit and exit another conduit can be spliced with wire nuts inside an "LB" is marked with a cubic inch capacity of at least ______ cubic inches
13.5
Where a branch circuit is protected with a 15-amp circuit breaker, the smallest circuit conductors that can be installed are ____ awg copper
14
At its lowest point, a service drop over a commercial driveway shall have a minimum height of _______ feet above the driveway. This is a truck entrance.
18
What is the minimum trade size schedule 80 pvc required to contain four 250 kcmil copper conductors?
2 1/2
The NEC reference that permits or requires that hydro massage tubs and all of their electrical components be GFCI protected is ________.
406.3(D)(2)
3 hours 20 minutes + 1 hour 48 minutes=
5 hours 8 minutes
If cable is to be installed for separate switching to heat/fan/light combination, how many conductors must be in the cable including a grounding conductor?
5 wires
When a branch circuit supplies both equipment fastened in place and cord-and-plug connected equipment, the permanently installed equipment shall not exceed ____ percent of the branch circuit rating.
50
58,342 watts = how many kW
58.342
NEC section _____ requires that all 125- volt, single phase 15 and 20 ampere receptacles used for temporary construction power be GFCI protected.
590.6 (A)
What is the maximum distance in feet permitted between straps where trade size 2 1/2 PVC is run for some distance straight between boxes or enclosures?
6
What is the monthly energy cost to operate a 200-watt high-pressure sodium lamp? Electricity costs. 11 per kW-hr and the lamp will be ON for 12 hours per day. There are 30 days in a billing month.
7.92
What moves or flows in a conductor to produce electric current?
Free electrons
When located ______, a receptacle is required to be GFCI protected I. in the bathroom in a convenience store II. in the bathroom wall at a restaurant and more than 6ft from a basin
I and II
Which of the following are standard size circuit breakers? I. 70 II.80
I and II
Which of the following are standard size circuit breakers? I. 90 II. 100
I and II
Power is represented by the letter or symbol _______.
P
______ allows a circuit or electrical system to be sized at less than its maximum connected load.
diversity
When two different multiwire branch circuits enter a junction box, all the neutral conductors are required to be tied together. T/F
false
For new residential construction, the wiring method is permitted to be Type NM cable where the building construction is _______.
hollow voids of cinder block
Cat 5e cables are highly _______ to interference from power wiring. I. immune II. susceptible
immune
Not more than one conductor shall be connected to the grounding electrode by a single clamp or fitting unless the clamp or fitting is ______.
listed for multiple conductors
a 4' T8 Ecolux 25W fluorescent lamp produces ______ a 30-watt, R20 incandescent lamp. For example, compare fluorescent to incadescent .
more light than
When a forced air heating system is used, heated air enters a room through ______.
registers
Pressing the ____ button on a GFCI receptacle restores power to the receptacle and any downstream connected equipment or receptacles.
reset
NM cable is often used in the following application
residential installation
the purpose of the "fins" on a dimmer is to _____.
sink away heat generated within the switch
The rating of an individual branch circuit shall not be less than _____ or the marked rating of an appliance having combined loads as provided in 422.62
the marked rating of the appliance
electrical equipment located 3.5 feet from the inside wall of a fountain is required to be grounded. T/F
true
A standby power system has been installed at a dwelling. The NEC requires the electrician to place a sign at the service-entrance equipment. What information about the standby power system must appear on the sign?
type and location
Luminaires that are installed on the outside of an office building under a covered entryway are permitted to be marked as suitable for ____ locations.
wet or damp
Does the NEC permit a 2-pole switch to be used as the disconnecting means for a 3.3 KVA, 240-volt, single phase air compressor? The switch is rated for the load.
yes
On the EWR print (7)what size are the floor joists?
2x10
Before setting up a ladder , you must ______.
inspect it for defects
Generally, the grounding electrode conductor shall be _____ without a splice or joint.
installed in one continuous length
a " unit switch" that is a part of an appliance and is used as a disconnecting means shall _____.
interrupt all ungrounded circuit conductors
The fewest number of 20-amp, 120-volt bathroom branch circuits permitted to be installed for bathroom receptacles in a restaurant is ____. There is one bathroom for men and one for women,
1
Trade size ______ is the minimum size schedule 40 pvc that can contain thirteen each 8 awg copper conductors.
1 1/4
Which of the following are permitted to serve as the disconnecting means for a food-waste disposer? I. the branch-circuit breaker II. a wall switch that disconnects the ungrounded conductor III. a receptacle and cord arrangement
any of these
What effect does using a larger size wire have on the resistance of the circuit?
decreases resistance
If likely to become energized, interior metal natural gas piping _______ required to be bonded in accordance with NEC section 250.104(B). is/in
is not
When calculating the size of the required service, you should consult household electric clothes dryer demand factors given in Table ______.
220.54
Look in the NEC Index and find uses permitted for AC cable. The code reference for this is _______.
320.10
What article in the NEC covers the use of type SE cable for dryer connections?
338
How much will it cost to install, operate, and maintain one luminaire with a 300-watt T2.5 Quartzline halogen lamp for 12 hours per day for 10 years ? The initial cost of the new luminaire is 140. Electricity costs .14 per kW-hr. The maintenance costs to replace 21 lamps during the 10-year period is 1680.
3659.60
Article ____ in the NEC covers the sizing of branch circuits for appliances used in restaurants/
422
Article ______ in the NEC provides requirements for generators.
445
What is the weekly cost to operate 75 watt, 120 volt lamp in a porch light? it is on a photocell that is ON 10 hours a day. The cost of electricity is 8.55 cent ( less than a dime) per Kw hour.
45 cents
If AFCI protection is to be provided in EWR Panel A, a total of ______ AFCI-type circuit breakers will be installed in EWR Panel A.
5
NEC section _____ requirement is that an optional standby system shall be capable of supplying the full load thats transferred by the automatic transfer equipment.
702.4
1" conduit costs $800 per 1000 foot bundle. The cost of one 10 foot stick is ____.
8
A four pair communication cable will contain _____ conductors
8
The servic-drop neutral conductor must be at least ______ AWG copper.
8
Generally, an overcurrent protective device is not permitted to be continuously loaded to ore than _____ percent of its rating,
80
Television antenna and lead-in wires are covered under article ______.
810
A new central air-conditioning unit is to be installed. This new AC replaces an old one. the nameplate information on the new equipment is : single phase 240 volts MCA 29.7 MOCP 40-amp fuses The existing circuit has 8 AWG Romex connected to a 50- AMP breaker in the panel and a fused safety switch near the unit. There are 50-amp fuses in the safety switch I. replace the fuses with ones rated at 40-amps II. Replace the breaker with a 2-pole 40 amp
I only
An electrician should always read _____ to determine any specific electrical requirements. I. installation instructions II. the nameplate. III. the owner's manual
I,II, and III
Which one of the following are standard size circuit breakers? I. 20 II. 25 III. 30
I,II, and III
Given the options shown below, which are required to be marked on an appliance nameplate? I. resistance II. voltage III. power
II and III only
While insalled Cat 5 cable, pulling too hard can damage the ______. I.Jacket II. Insulation III, conductor
all of these
An air conditioner will be installed on the roof of a resturaunt as well as a 125-volt convenience receptacle for servicing the equipment. Per the NEC, the receptacle ______ permitted to be connected to the circuit on the line side of the equipment disconnecting means. I/IN
is
According to Ohm's Law, when all conduit fittings are tight and the equipment grounding conductors are bonded to each metal box, the total resistance of the ground-return path ______. Consequently, when a ground fault occurs, the overcurrent protective device can open as quickly as possible because the fault current is as high as possible. Hint: I=E/R
is decreased
A ____ is a box that conains only branch circuit conductos that are "hard wired" to a piece of equipment.
outlet
Branch circuits are rated according to their ______.
overcurrent protective device rating
1.2 MV= how many volts
1,200,000
Article _______ in the NEC distinguishes between an outlet and a receptacle.
100
Operating a 240-volt water heater at 208 volts will result in _____ heat output.
lower
What kind of electrical charge does an electron have?
negative
The common name for a U-shaped 90-degree bend with a straight section of conduit between the bends is a
Back to Back
In a dwelling garage, a 20-ampere, 125-volt receptacle installed for general use and located over a work bench would not require GFCI protection. T/F
False
What kind of lamp is an F96-T8
Fluorescent
What type of lamp is an F36-T8?
Fluorescent
Wire sizes up through 4/0 are expressed in American Wire Gauge. Wire sizes larger than 4/0 are expressed in
Kcmil
Section 210.8 (A)(2) in the NEC permits a single receptacle in the garage of a home to be unprotected by a GFCi if a freezer is to be connected to this receptacle. T/F
false
If an electric water heater is located within sight of the panel board that supplies it, a disconnect that opens all ungrounded conductors _____ required.
is not
How would 13,800 volts be written in metric notation?
13.8 kV
Where 10 AWG copper circuit conductors are connected to a 15-amp circuit breaker, the circuit is considered to be a _____ -amp branch circuit
15
The maximum current-carrying capacity of a 2,000 watt, 120-volt dimmer is ____ amps
16.7
The maximum number of 12 AWG conductors that are permitted to be installed in a 4 11/16 x2 1/8 swuare box is ______.
18
41.5% of 4378 equals
1816.87
The code section that specifies special requirements for bedroom branch circuits in a house is______/
210.12(A)
The diameter of a T6 lamp is ____ inches.
3/4
For the garage door opener circuit shown in Figure 107-22, what is the opener circuit resistance if the nameplate supplies the following information 3.8 Amps 115 Volts
30.2632
The maximum number of luminaires that can be installed on a 20-amp 277-volt branch circuit is ____. Each luminaire will draw 72.6 watts at 277 volts. These luminaires will not be operated continuously.
76
Which tools would be best to use to tighten the locknut/connector to the box? I. linemans pliers and a flat blade screwdriver II. Tongue and groove pliers
II
Which of the following circuit conditions will cause a circuit breaker to trip? I.short-circuit II. overload III. normal
I and II
Two 20-amp circuits with a shared neutral are fed from a 120/240 volt, single phase panel. If the ungrounded circuit conductors are connected to breakers 1 and 2, which of the following will happen when a 16-amp load is connected to Circuit 1 and 14-amp load is connected to circuit 2?
The grounded conductor will be overloaded
What is the maximum number of recessed luminaires that can be installed on a 20-amp 277-volt branch circuit? Each luminaire will draw 36.8 watts at 277 volts.
120
A group of five single gang boxes are to be ganged together and have the following installed in the assembly: three single-pole switches, two three-way switches, two-12 AWG hot conductors, seven 12-awg neutral conductors, five 12 AWG switch legs, five 12 awg grounds, and five internal cable clamps. What minimum size would each of the ganged boxed have to be?
3"x2"x2.5" device
The unit of measurement for resistance is represented by the letter or symbol _________.
Ohms
Code section _______ refers to the installation of face-up receptacles in bathroom basin countertops.
406.5(E)
Section ____ of the NEC states that a luminaire installed under the roof of an open porch must be marked "suitable for ____ locations"
410.10(A), damp
If you use 25% of the conduit from the storage rack how many feet of conduit will you have remaining on the Rack? you started with 580 sticks of pipe that are each 10 feet long.
4350
Opposition to current flow is generally termed __________.
resistance
Chapters 5,6, and 7 of the NEC relate to:
special occupancies and conditions along with special equipment
How much current is drawn by a 240-volt clothes dryer that has as rating of 5,400 volt-amperes.
22.5
.0001 A= how many milliamps
100
Section 210.8 (A)(5) of the NEC states that a receptacle located in ____ in a house shall be GFCI protected. I. a finished basement II. an unfinished basement III. a workroom in an unfinished basement
II and III only
for a 277/480 volt, 3 phase, 4-wire supply system the voltage from A phase to B phase is_____.
none of these
It is safer when using a wrench to adjust your stance and then______ on the wrench handle.
pull
Branch circuits are rated according to
the ampere rating of the overcurrent device
A circuit is energized. When you touch the probes of a voltmeter across the terminals of a single-pole switch that is in the ON position, you are putting the meter in a parallel with the switch but almost all of the circuit current flows through the switch instead of the extremely high resistance meter. T/F
true
