ELC 114 quizes and test
EMT fittings can be made up of three types of material. They are: [___________________] , [____________] or [_____________________________]
steel, aluminum, die-cast
Conductors installed in a conduit, that is less than 24 inches long, are not required to be de-rated.
t
If an appliance's rating does not exceed 1/8 horsepower or does not exceed 300 volt amps, the branch circuit over current device may serve as the appliance's disconnecting means.
t
If the ampere rating of a motor is listed on the motor name plate, you are allowed to use that rating to determine the overload size?
t
LFMC is more commonly used in ___________________ or Damp locations.
wet
What size pull box is required on a 3" run of Rigid conduit where the conduit makes a 90 degree turn in the box ? [_________________] " by [______________________] ".
wrong 3, 6
What size rigid metallic conduit is required for 32 # 14 THHN conductors ? _________________
1"
For every ____ degree Celsius rise above the motor's rated temperature, the motor's insulation life is cut in half.
10
Several NEC® sections contain the requirement to size conductors and overcurrent devices at 100 percent of the noncontinuous loads plus ____ percent of the continuous loads.
125
What is the minimum starting current for a 240-volt, 3-phase, Code letter J, 7-1/2-horsepower motor?
128 amperes
Most large commercial buildings use two voltages: 480Y/277 volts and ____/120 volts.
208 Y
The standard breaker sizes are found in article and section number of the code?
240.6(A)
Water heaters are available for commercial occupancies in many sizes and voltages, and for both single and ____ supply.
3-phase
NEC® 408.36(A) stipulates that if the panelboard contains snap switches with a rating of ____ amperes or less, the panelboard overcurrent protection is not permitted to exceed 200 amperes.
30
What is the full load current rating of a single phase, 7 ½ hp, 230 volt motor? _____________ Amps.(write only numbers)
40
Use your commercial drawings in the back of your book to answer the following questions. What is the diameter of the steel columns on the first floor? ___________________
6"
What is an effective ground-fault current path?
It is a path that has low impedance and allows electricity to flow through it when there is a ground fault. An example would be a grounding electrode conductor.
A motor with a locked-rotor value of 15.25 will have the code letter _________ indicated on it.
R
____ that have the light source completely enclosed are permitted in clothes closets.
a. Surface-mounted or recessed fluorescent luminaires
GFPE monitors are designed to sense ____ faults only.
a. phase-to-ground
Using the drawings in the back of your book, answer the following questions: The exhaust fan outlet in the bakery is to be located ______________ ft below the ceiling.
1
When tabulating materials, take special note of long runs of raceway or cable and determine whether ____ is a problem. This can mean an increase in conductor and/or raceway size.
wrong ampacity
Currents of the 3rd harmonic and odd multiples of the 3rd harmonic (9th, 15th, 21st, etc.) add together in the common neutral conductor of a 3-phase system, instead of canceling each other. These odd multiples are referred to as ____.
triplens
Use your commercial drawings in the back of your book to answer the following questions. What is the length of the property line along Illinois Ave.? __________________
135.15'
Use your commercial drawings in the back of your book to answer the following questions. How thick are the foundation walls? ____________________
15"
Construction plans for a building are usually called [__________________] or working drawings and the document(s) governing all of the material to be used and work to be performed on a construction project are called the [_______________________] .
2 out of 4 points blueprints schedule of drawings
In a wireway, the number of conductors cannot exceed ___________________ percent of the cross sectional area of the wireway.
20
Show window lighting is required to be calculated at [_______] va per linear foot and in commercial buildings, receptacles outlets are to be calculated a [___________] va each.
200 180
Use your commercial drawings in the back of your book to answer the following questions. What is the elevation of the second floor? _____________
218.33'
What is the distance required between opposite walls of a box with a 3" EMT conduit where the conduit is running straight through the box ? ___________________"
24
All appliances are required to have a nameplate that indicates [_____________] , [______________],[_____________________] , or [_______________________] .
3 out 4 points manufacturer model operating voltage va
The total voltage drop in the feeder and branch circuits should not exceed ____ percent.
5
BASED OF THE INFORMATION OF THE QUESTION WITH 3 MOTORS, ANSWER THE NEXT QUESTIONS: (NO DECIMALS ON ANSWERS). 14. Feeder maximum current : (15 pts) [________________________]Amps. 15. Feeder OCPD, Inverse time Circuit Breaker (15 pts) : [__________________] Amps. Specified Answer for: ________________________259Specified Answer for: __________________300/300
5 out of 10 points 259 300
Use your commercial drawings in the back of your book to answer the following questions. What is the distance from the Drug store show case to the inside of the front wall of the building? ______________ ft.
5'
A FEEDER IS REQUIRED TO SUPPLY THREE, 3-PHASE, 440 VOL MOTORS. BASED ON THE MOTOR INFORMATION SUPPLIED BELOW, FILL IN BLANKS 8-15 QUESTIONS. NO DECIMALS. Motor #1 Motor #2 Motor #3 PF 90% Temp. 40 degree C S.F. 1.25 100 HP 60 HP 20 HP Code "A" Code "J" Code "C" Nameplate : 96A Nameplate : 72A Nameplate : 23A Synchronous Induction Induction Motor # 1 Motor # 2 Motor # 3 F.L.A. (7 pts) Motor#1[A]Amps. Motor#2[B]Amps. Motor#3[C]Amps. Time Delay Fuse(7pts) Motor#1[D]Amps. Motor#2[E]Amps. Motor#3[F]Amps.
7 out of 10 points Specified Answer for: A 124 Specified Answer for: B 77 Specified Answer for: C 27 Specified Answer for: D 217/225 Specified Answer for: E 135/150 Specified Answer for: F 47/50
For conductors larger than 1 AWG or for overcurrent devices rated greater than 100 amperes, the default rating of terminals is ____ degrees C.
75
Why are there special requirements for clothes closets?
A clothes closet could be hazardous becasue they can catch on fire. There are special regulations and requirements with light fixtures and storage items in clothes closets.
NEC ® 110.16 has a requirement for placing a notice on certain equipment to warn qualified persons of the serious hazard of ____ flash events.
arc
That portion of the wiring system between the final over current device protecting the circuit and the outlet(s) is called a __________________ circuit.
branch
Compression fittings for EMT are classified as raintight and ____-tight types.
concrete
If a load is expected to be on for more than three hours, then it is considered to be a (an)_________________ load.
continuous
An ac-dc general-use snap switch is always marked with the ____.
current and voltage rating
In the first phase of the installation of a telephone system in a commercial building, the ____ will install an empty conduit system according to specifications for the commercial building and in the locations indicated on the working drawings.
electrical contractor
An individual appliance branch circuit shall have a rating less than the appliance's "marked rating".
f
The conductors supplying a single motor shall have an ampacity of not less than 135 percent of the motor full load current?
f
The number of degrees of bends in type IMC conduit cannot exceed 180 degrees between pull points.
f
Openings around electrical penetrations through fire-rated walls shall be ________________________ to maintain the fire-resistance rating.
fire stopped
When pulling three conductors or cables into a raceway, if the ratio of the raceway diameter to the conductor diameter is between 2.8 and 3.2, jamming can occur. With ____ or more conductors or cables, jamming is highly unlikely.
four
What type of branch circuit supplies two or more receptacles or outlets for lighting and appliances?
general purpose
When connecting receptacles in a multioutlet assembly, the ____ must be continuous so that the removal of a device will not interrupt continuity.
grounded circuit conductor
Dim or flickering lights may be caused by problems ____ if the voltage at the line-side terminals of the main service is satisfactory.
in the premises wiring
Most motor circuits are protected by dual-element, time delay fuses or ______________-___________________circuit breakers
inverse time
For motors, the OCPDs are ____.
inverse time circuit breakers
The two basic methods of metering are primary high-voltage metering and ____.
low voltage metering
A common example of a tap is for fixture whips that connect a ____ to a branch circuit.
luminaire
With a "____" elevator, the entire elevator lifting mechanism is located in the elevator shaft either on the elevator or on the wall.
machine room less
In general, panelboards are constructed so the ____ run vertically for nearly the height of the panelboard.
main feed busbars
What type of load is considered a type M load?
motor
____ boxes are used primarily to install ceiling outlets.
octagonal
The purpose of a(n) ____ device is to protect the circuit wiring and devices and to some extent the equipment served by the circuit.
overcurrent protection
Using the drawings in the back of your book, answer the following questions: What room is the Fire alarm control panel located in? ____________________
owner storage
GFPE monitors are designed to sense ____ faults only.
phase to ground
____ for multioutlet assemblies are available with GFCI, isolated ground, and surge suppression features.
receptacles
When a branch circuit supplies an air conditioning system that consists of a hermetic motor-compressor and other loads, the circuit rating must not exceed ____ percent of the hermetic motor load plus the sum of the additional loads.
wrong- 125
Use your commercial drawings in the back of your book to answer the following questions. What is the distance between the center steel columns? _________________
wrong- 13' from the center of each
Use your commercial drawings in the back of your book to answer the following questions. What is the inside distance in the drugstore storage area from the exterior block wall to the block wall separating the drugstore from the bakery? ______________
wrong- 4'
Which factor does not generally influence the resistance of a conductor?
wrong- length
