First Year, Second Semester mid term
Because a water heater represents a continuous load, the branch circuit must be rated not less than ______ percent of the water heater nameplate rating.
125 percent
Each 10' section of lighting track is rated for 15 amps at 125 volts. The circuit supplying this track can be connected to a _____- amp, single pole breaker in a 120/240-volt, 1 phase, 3 wire panel.
15 amp only.
The minimum rating of a dimmer used to control 120-volt track lighting is ______ watts. The track has twelve luminaires installed. Each luminaire has a lamp with a rating of 120 watts at 120 volts.
1500 watts
what is the maximum distance of the receptacle from the intended location of the washing machine?
6 feet
What is the rated wattage of the most commonly used dimmer that fits in a single-gang box in a residence?
600 Watts
The NEC _____ permit the cord and plug connection from a range to a receptacle to be used as the disconnecting means.
DOES
The NEC _______ permit a motion sensor to control the lighting in a bathroom. The bathroom is in your customer's home and the sensor does not have a manual override switch.
DOES NOT!!!!
For three resistive loads that are connected in parallel, which of the following statements is the only true statement?
Total current is equal to the sum of the individual currents through the three loads. (iT=i1+i2+i3)
a "unit switch" that is a part of an appliance and is used as a disconnecting means shall _________
interrupt all ungrounded circuit conductors.
What is a characteristic of total current in a parallel circuit?
total current is divided among all loads.
When an appliance is not marked with its maximum overcurrent protection, the branch circuit protection device is _________
Sized according to the ampacity of the branch circuit conductors supplying the appliance.
When air conditioning is installed in an attic, a ______ is required.
-Disconnecting means for the AC equipment -Lighting outlet near the AC equipment -Light switch near the attic entrance -convenience receptacle within 25 feet of the AC equipment.
What is the rule for internal clamps in a box fill calculation?
1 X size of the largest conductor
What is the rule for ground wires in a box fill calculation?
1 X the size of the largest conductor.
if an H/V/L/NL contains an 850 watt heating element, a 3.2 amp fan motor, a 15 watt night light, and a 100 watt lamp, it will pull a total of _____ amps if everything operates at once. All the components are rated to operate at 120 volts.
11.24 Amps
table 300.5 in the NEC allows residential, 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 inches
The current rating of a 1725 watt, 120 volt heat/vent/light unit is _______ amperes.
14.375 amps
The maximum current carrying capacity of a 2000 watt, 120 volt dimmer is _____ amps.
16.7 amps
What is the rule for devices in a box fill calculation?
2 X the size of the largest conductor
Section ______ of the NEC states that an overhead garage door receptacle shall be GFCI protected.
210.8(A)(2)
how much current is drawn by a 240-volt clothes dryer that has a rating of 5400 volt-amperes?
22.5 amperes
A circuit has 4 identical loads connected in parallel. The circuit voltage is 277 volts and the total connected load draws 11.2 amperes of current. the total resistance of the circuit is ______ Ohms
24.73 Ohms
A ______ branch circuit is connected to the electric furnace in the EWR residence.
240 volt, 70 amp
For the EWR residence, what voltage does the water heater show on the special purpose outlet schedule?
240 volts.
How much current does a 6,000 volt-ampere, 240 volt clothes dryer draw?
25 amperes
What size THWN copper conductors are required to supply a 15,000 watt, 240 volt furnace? (single phase, 75 degree Celsius terminations)
4 AWG
Types of flexible cords are listed in table _______
400.4
The NEC requirement that "each electric appliance shall be provided with a nameplate giving the identifying name and the rating in volts and amperes, or in volts and watts" is located in article _______
422
What NEC article covers the rules necessary for the installation of appliances?
422
What article in the NEC contains a section that states the branch circuit overcurrent rating is not to exceed the overcurrent device rating marked on the appliance?
422
The maximum current carrying capacity of a 600 watt, 120-volt dimmer is _______ amps.
5 amps
The only dimmer sizes available are:
600, 1000, 2000 watt
What size THWN/THHN copper wire is required for a clothes dryer that draws 32.5 amperes? What size THWN/THHN copper wire is required to supply a clothes dryer that has the following on the manufacturer nameplate? -32.5A -240V -45A circuit breaker
8 AWG
the maximum current carrying capacity of a 1,000 watt, 120 volt dimmer is ______ amps.
8.3 amps
Supply conductors for electric baseboard heaters generally have to be rated:
90 degrees celsius
A circuit has 4 identical loads connected in parallel. The circuit voltage is 277 volts and the total connected load draws 11.2 amperes of current. The resistance of each of the identical loads is _____ ohms.
98.93 Ohms
What article in the NEC covers the connection of a dryer frame to an equipment grounding conductor?
Article 250
Which code article covers electric appliances used in any occupancy?
Article 422
article ______ in the NEC covers the sizing of branch circuits for appliances used in homes.
Article 422
Generally, to dim fluorescent lamps, special ______ and _______ are needed.
Ballasts and dimmer switches.
Bathroom branch circuits must be installed in a restaurant
False, none are required.
In general, Residential loads and devices such as lighting fixtures and receptacles are connected _______ to branch circuits defined by the national electric code.
IN PARALLEL
A receptacle is mounted inside of a kitchen cabinet for the purpose of plugging in a microwave oven. This receptacle _______ to be connected to the same circuit that supplies the other receptacles that serve the countertop areas.
IS NOT PERMITTED.
When located ________, a receptacle is required to be GFCI protected.
In a bathroom at IEC, and outside on the exterior wall of an elementary school.
Several luminaires are installed outside on the covered deck of a house and are connected to a dedicated individual 15-amp, 120 volt circuit. The lighting is controlled from a switch located outside near the back door that exits the house. the lighting circuit ___________ required to be AFCI protected.
Is NOT
Operating a 240-volt water heater (or other resistive load) at 208 volts will result in ________ heat output (in watts) and a _______ life.
Lower heat output, longer life.
In the Study, are all 4 switches on the plan-north wall to be installed in a 4-gang box?
NO
When dimming fluorescent lighting, can mixed ballasts or lamps from different manufacturers be controlled from the same dimmer?
NOO!
For most dishwashers, the motor and heating element for drying are referred to in the NEC at 220.60 as _________ loads because they do not operate simultaneously. This heating element is NOT the booster heating element.
Noncoincident loads
The fewest number of 120V, 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 receptacles.
ONE BRANCH CIRCUIT
What is the minimum number of 120V receptacles required in a dwelling laundry room?
ONE ONLY
When conductors are run into a box and are to be hard-wired to a piece of equipment, this box is a(n) ______ per the NEC definition.
OUTLET
When a single car garage is attached to a house, the NEC requires that the garage have at least __________ receptacles installed inside the garage.
One (on any wall)
Food waste disposers include a small manual reset button to restart the motor if it overheats and goes off line due to prolonged use or if something falling into the unit and it jams. this manual reset provides the _____ protection required by code for this type of appliance.
Overload protection
A single 24-volt battery will supply power to two identical 24-volt loads. The loads would be connected in _______ to receive the correct voltage from the battery.
PARALLEL
two 12-volt batteries would be connected in _______ to deliver the correct voltage to a 12 volt load.
PARALLEL
The battery compartment in a forklift contains two 36-volt batteries. The DC motor n the forklift is rated to operate at 36 volts. the two batteries are connected in ________
Parallel
multiple pushbutton switches controlling a garage door opener are connected in _______ with eachother.
Parallel
An electric circuit consists of:
Power source Conductors load switches
an electrician should always read ________ to determine any specific electrical requirements.
The installation instructions, the owners manual, and the nameplate.
What is a characteristic of the total resistance in a parallel circuit?
The total is smaller than the value of the smallest single resistance in the circuit.
Which of the following is used to regulate the heat in electric clothes dryers?
Thermostat
The _________ supplied to the connected load increases when batteries are connected in series.
VOLTAGE
exhaust fans are often used in laundry rooms to remove moisture. these fans can be installed in ________
Walls and Ceilings!
To better control environmental air in a laundry room, a _______ is used to control exhaust fans.
humidistat
What is the device called that senses the moisture level
humidistat
Current in a parallel circuit of three resistive elements uses which formula?
i(t)+i1+i2+i3
When a forced air heating system is used, heated air enters a room through ________
registers
Type UF cable installed in PVC under a building must be installed at least _______ inches deep
ZEROOOOOO
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 parallel with the switch but almost all of the circuit current flows through the switch instead of the extremely high resistance meter.
TRUE, REMEMBER.
A receptacle installed _____ is required to be GFCI protected where installed in a dwelling kitchen.
Under a kitchen sink for the garbage disposal, and under a kitchen sink for the dishwasher.
A receptacle under the kitchen counter of a dwelling is used to supply power to a disposal. is the receptacle required to be GFCI protected?
YESSSSS
The fewest number of 20 amp, 120V bathroom branch circuits permitted to be installed for bathroom receptacles in a restaurant is _______. There is one bathroom for men and one for women.
ZERO, ITS COMMERCIAL
A 120-volt circuit is supplying power to three 120-volt loads. Load #1 is drawing 3.3 amps. Load #2 pulls 6.5 amps. Load #3 is drawing 5.1 amps. The total load on the circuit is _________ kW
1.788
A 120-volt small-appliance branch circuit in a house is supplying power to several receptacles. A space heater, a toaster, and a waffle maker are plugged into these receptacles. if the space heater draws 7 amps, the toaster draws 5 amps, and the waffle maker pulls 8 amps the the current carried by the circuit breaker is ________ amps.
20 MUH ****IN AMPS
A water heater has a nameplate rating of 5 KW @ 230 volts. this water heater will draw _____ amps when operated at the rated voltage.
21.74 amps
The code section that specifies the number of bathroom branch circuits in a dwelling is _______
210.11 (C)(3)
The code section that specifies that the rating of any one cord and plug connected utilization equipment (not fastened in place) shall not exceed 16 amps for a 20-amp branch circuit is ________
210.23(A)(1)
Which of the following code references requires a receptacle to be installed in a garage that is attached to a house?
210.52 (G)
Which of the following code references requires a lighting outlet to be installed in a garage that is attached to a house?
210.70(A)(2)(a)
Code section ______ refers to the installation of face-up receptacles in bathroom basin countertops.
406.5(E)
What article in the NEC covers the use of type SE cable for dryer connections?
article 338
Which article in the NEC covers Electrical disconnects for dishwashers?
article 422
When an outdoor receptacle is used for the permanent connection of a cord from a 12-volt low-voltage lighting transformer, a cover must be provided that maintains the weatherproof integrity of the receptacle.
TRUEEEE
In general, all 125 volt, 15 amp receptacles installed in residential garages shall have GFCI protection.
TRUUUEEEEEE
Power in a parallel circuit of three resistive elements uses which formula?
P(T)= P1+P2+P3
Section ______ of the NEC states that a central heating system must be supplied by an individual branch circuit.
422.12
Exhaust fan ventilating capability is rated in _______
Cubic feet per minute (CFM)
an ammeter always reads in _______
SERIES
The white conductor contained in a 12/2 with ground MC cable can be marked with orange tape where visible or accessible and used to connect a 240 volt pump motor.
TRUE
What size THWN/THHN copper wire is required to supply a clothes dryer that has the following on the manufacturer nameplate? -5600 volt-amperes -240 Volts -30A circuit breaker
10 AWG
As measured along the floor line, make sure that a receptacle is not more than _____ feet from the next receptacle when laying out the wall receptacle locations in a bedroom of a house.
12 feet
NEC article ______ includes a section that covers using a cord and plug as a disconnecting means for a clothes dryer.
Article 422
Electronic dimmers are used in some installations.
Trueeeee
the two 20 ampere small appliance branch circuits required for the kitchen and dining room area are intended to supply _____ appliances.
countertop appliances.
One, two, or three circuit track lighting is available.
True
The grounded conductor of an existing branch circuit is permitted to serve as the equipment grounding conductor for a replacement range or cooktop when which of the following conditions are met?
1)The grounded conductor is not smaller than 10 AWG copper or 8 AWG aluminum 2) The individual branch circuit is existing. 3)The grounded conductor is insulated, unless it is part of type SE cable.
All electrical outlets in residential bedrooms shall be protected by:
Arc-fault circuit interrupters.
The _____ supplied to the connected load increases when batteries are connected in parallel.
CURRENT
Voltage in a parallel circuit of three resistive elements uses which formula?
E(t)=E1=E2=E3
Rocks, debris or any course material readily available may be used to backfill a trench as long as it was removed from the same trench.
FALSE
Since the grounded (neutral) conductor is not permitted to be used for connecting an equipment grounding conductor to the frames of electric ranges, ovens, or cooktops in new installations, these appliances require _____ power cords.
FOUR WIRE POWER CORDS
If the aluminum "fins" of a 120-volt, 1000 watt dimmer are broken off, the dimmer can now carry _______ current than its original rating.
LESS CURRENT
According to Article 422, an accessible separable connector or an accessible ______ shall be permitted to serve as the disconnecting means for cord and plug connected appliances.
Plug and receptacle
Resistance in a parallel circuit of three resistive elements uses which formula?
R(T)= 1/ [1/R1+1/R2+1/R3]
When conductors are run into a box and a receptacle is installed, this box is a(n) ______ per the NEC definition.
Receptacle outlet.
A permanently connected 1.2 KW appliance is located in a commercial kitchen. The panelboard that provides power to this appliance is not in the same room with the appliance. the circuit breaker cannot be locked in the off position. the branch circuit breaker _____ serve as the disconnecting means for the appliance.
SHALL NOT
Before applying power to an electric water heater, _________
THE TANK MUST BE FULL OF WATER
GFCI protection is required for a single receptacle installed to power a residential garage door opener.
TRUE
A circuit is energized, when you touch the probes (leads) of a voltmeter across the terminals of a single pole switch that is in the OFF position, you are completing the circuit.
TRUE, REMEMBER
Does the NEC permit a 2 pole breaker to be used as the disconnecting means for a 3.3 KVA, 240 volt, 1 phase air compressor? The equipment is installed in the electrical room with and is within sight of the circuit breaker panelboard.
YES
