According to Ohms Law, what is the electrical unit of current?
ampere
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The NEC® definition of ________ is “connected to establish electrical continuity and conductivity”.
bonded (bonding)
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In addition to the number of 120-volt, single-phase branch circuits required in other areas of a dwelling, at least one additional ________ branch circuit shall be provided to supply the laundry outlet in the laundry room.
20-amperes
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Where rigid metal conduit (RMC) or intermediate metal conduit (IMC) is threaded in the field where corrosion protection is necessary, the threads shall be coated with a/an ________ compound.
approved electrically conductive, corrosion-resistant
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In a straight run of rigid Type PVC conduit, expansion fittings are to be provided to compensate for thermal expansion and contraction where the length change is expected to be at least ________ or greater.
1⁄4 in.
What is permitted in the dedicated electrical space above a panelboard?
leak protection and sprinkler protection
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For other than submersible types of motors, they shall be located so that adequate ________ is provided and so that maintenance, such as lubrication of bearings and replacing of brushes, can be readily accomplished.
ventilation
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For bathtub and shower areas, no parts of cord-connected luminaires, lighting track or ceiling-suspended (paddle) fans shall be located within a zone measured ________ horizontally from the top of the bathtub rim or shower stall threshold.
3 feet
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Given: After all demand factors have been taken into consideration, a one-family dwelling with a 120/240-volt, single-phase electrical system has a demand load of 35,000 VA. The MINIMUM size THWN copper phase conductors required for an underground installed service is ________.
2 AWG
I = 36,000 VA/240 volts
= 145.8 amperes x .83
= 121 amperes
Size 2 AWG copper conductors with an ampacity of 125 amperes should be selected from Table 310.12.
True or False:
In general, when sizing the overcurrent protection, disconnect size, and supply circuit conductors for a motor used in a continuous-duty application, they shall be sized based on the full-load running current of the motor given in the Tables of the NEC.
TRUE
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Continuous-duty motors, more than one hp, with a marked service factor less than 1.15 shall have the MINIMUM running overload protection sized at ________ of the nameplate rating of the motor, where modification of this value is not necessary.
115 percent
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Mobile home service equipment shall be located in sight from and NOT more than ________ from the exterior wall of the mobile home it serves.
30 feet
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As a general rule, switches or circuit breakers shall ________.
not disconnect the grounded conductor of a circuit
What is the MINIMUM number of 120-volt, 20-ampere, single phase branch-circuits that must be provided to supply receptacle outlets in dwelling units?
five
Fill in the blank:
Small gage conductors such as a single size 16 AWG conductor is permitted to carry continuous loads up to ________, as long as the conductor is protected by a fuse or circuit breaker.
8 amperes
Fill in the blank:
The accessible portion of abandoned supply circuits and interconnecting cables located in an information technology equipment room shall be removed, UNLESS ________.
contained in a raceway
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Generally, in dwelling units, where one or more lighting outlets are installed for interior stairways, there shall be a wall switch at each floor level, and landing level that includes an entryway, to control the lighting outlets where the stairway between floor levels has at LEAST ________ risers or more.
six
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A receptacle installed outdoors in a location protected from the weather or in other damp locations shall have an enclosure for the receptacle that is ________ when the receptacle is covered (attachment plug cap not inserted and receptacle covers closed).
weatherproof
True or False:
A fused disconnecting means for motor circuits rated 1000 volts or less, shall have an ampacity of at LEAST 115 percent of the full-load current rating of the motor it disconnects.
TRUE
Determine the current, in amperes, on the circuit conductors for a 208Y/120-volt, 3- phase system where each phase is balanced with a 2,500 VA load and the total load is 7,500 VA.
20.82 amperes
I = VA ÷ volts x 1.732
I = 7,500 VA/208 x 1.732
= 7,500/360.25
= 20.82 amperes
Fill in the blank:
No overcurrent device shall be connected in series with any conductor that is intentionally grounded, unless the overcurrent device or circuit breaker ________.
simultaneously opens all conductors of the circuit including the grounded conductor
Fill in the blank:
For temporary wiring installations that have an assured equipment grounding conductor program, all required tests shall be performed at intervals NOT exceeding ________.
3 months
Fill in the blank:
For continuous-duty motors, the motor nameplate current rating is used to determine the size of the ________ required for the motor.
motor overload protection
Fill in the blank:
GFCI protection for personnel is required where a 125-volt, single-phase, receptacle is located on a wet bar countertop if within ________ from the top inside edge of the bowl of the sink.
6 feet
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Unit 1: Pie Circle Formulas25
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Unit 2: Branch Circuits25
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Unit 3: Cooking Equipment & Appliance Demand Loads25
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Unit 4: Conductor Ampacity and Sizing25
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Unit 5: Box and Raceway Sizing25
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Unit 6: Voltage Drop Calculations25
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Unit 7: AC Motor Calculations25
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Unit 8: Single Family Dwelling Service Calculations25
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Unit 9: Multi Family Dwelling Service Calculations25
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Unit 10: Commercial Load Calculations25
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Unit 11: General Practice25
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Unit 12: General Practice25
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Final Exam 180
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Final Exam 280
