Test 3
Calculate in order to serve a 15,700-VA noncontinuous lighting load, how many 120-volt 15-ampere circuits would be required? 1. 5 2. 7 3. 9 4. 11
3. 9
What would be the maximum permitted new load on a 120/240 volt, 200 A service that has an existing load of 80 amperes? 1. 200 amperes 2. 180 amperes 3. 125 amperes 4. 100 amperes
4. 100 amperes
What is the maximum number of compact 1 AWG copper conductors with THHN insulation permitted in 2-inch RMC? 1. 4 2. 6 3. 8 4. 10
4. 10
Calculate the minimum size branch circuit conductors for a single motor given the following conditions: Operating Voltage: 208 volts - Electric Power: Three-Phase - Motor Horsepower: 5 HP - Nameplate Rating: 15.9 amperes - Motor Type: Design B - Duty Cycle Service: 5-minute rated, short-time 1. 12 AWG 2. 10 AWG 3. 8 AWG 4 .14 AWG
4. 14 AWG
Information technology, including data processing equipment, shall be listed and a type permitted to be connected to a branch circuit by a power supply cord that does not exceed how many feet in length? 1. 3 2. 6 3. 12 4. 15
4. 15
According to the National Electrical code Article 210, when a single receptacle is installed on a 15 amp branch circuit for the sole purpose of supplying a lighting transformer, what would be the required rating of the single type receptacle? 1. 20 amperes 2. 18 amperes 3. 16 amperes 4. 15 amperes
4. 15 amperes
The National Electrical Code states that "generators operating at 65 volts or less and driven by individual motors shall be considered as protected by the overcurrent device protecting the motor if these devices will operate when the generators are delivering not more than WHAT PERCENTAGE of their full-load rated current?" 1. 80 2. 100 3. 125 4. 150
4. 150
Given that the following 13 conductors of different sizes will be installed in electrical metallic tubing, what would be the MINIMUM size conduit permitted by the NEC? (4) #3 AWG THW (3) #8 AWG THW (6) #12 AWG THHN 1. 1-1/2 inches 2. 1-1/4 inches 3. 1 inches 4. 1-3/4 inches
1. 1-1/2 inches
Flexible cord and cable, tinsel cord, extension cords, and fixture wires shall be protected against overcurrent. Therefore, if a fixture wire is size 16 AWG, and is tapped to a 20 branch circuit conductor, what would be the maximum length of run? 1. 100 feet 2. 50 feet 3. 20 feet 4. 6 feet
1. 100 feet
Given, a multi-family residence contains three ovens rated 3,500 VA, 8,000 VA, and 6,000 VA, a cook top rated 6,000 VA, and a counter mounted broiler rated at 3,500 VA. What is the minimum calculated demand load for this installation? 1. 12,150 VA 2. 15,500 VA 3. 17,500 VA 4. 27,000 VA
1. 12,150 VA
The NEC allows the calculation of the branch circuit load for one or more ranges to be in accordance with Table 220.55. The notes further allow for multiple individual appliances to be treated as equivalent to one range. Therefore, calculate dwelling unit feeder demand load for the following; One 12,000 Watt counter mounted cooking unit, and -Two 6,000 Watt wall mounted ovens. 1. 12.8 kW 2. 14.0 kW 3. 15.8 kW 4. 19.8 kW
1. 12.8 kW
The National Electrical Code permits the application of the optional method for feeder and service calculation of various occupancies, such as a store building. Therefore, what would be the calculated feeder or service ampacity for the following loads? Existing load: 36,336 VA New general lighting for additional storage based on: 200 square feet New general use receptacles: One receptacle Operating Voltage: 120/240 Volts 1. 192.50 amperes 2. 187.21 amperes 3. 175.34 amperes 14 164.89 amperes
1. 192.50 amperes
What would be the calculated total demand load for a commercial building with the following multi-outlet assembly appliances? Appliances that are unlikely to be used simultaneously are on runs of 13, 25, and 6 feet. Appliances that are likely to be used simultaneously are on runs of 41, 28, 19, and 24 feet. 1. 21,960 VA 2. 20,160 VA 3. 19,540 VA 4. 1,620 VA
1. 21,960 VA
National Electrical Code grounding electrode requirements include that each plate electrode (electrically conductive coated iron or steel plates) shall expose not less than "how many square INCHES" of surface to the exterior buried underground soil? 1. 288 square inches 2. 144 square inches 3. 72 square inches 4. 36 square inches
1. 288 square inches
Luminaires, lighting outlets, and ceiling-suspended (paddle) fans installed in the area extending between "HOW MANY FEET" horizontally from the inside walls of a pool shall be protected by a ground-fault circuit interrupter unless installed not less than "HOW MANY FEET" above the maximum water level and rigidly attached to the structure adjacent to or enclosing the pool. Assume an existing installation. 1. 5 feet horizontally and 5 feet above the maximum water level 2. 6 feet horizontally and 6 feet above the maximum water level 3. 7 feet horizontally and 7 feet above the maximum water level 4. 8 feet horizontally and 8 feet above the maximum water level
1. 5 feet horizontally and 5 feet above the maximum water level
Swimming pool parts shall be bonded together using solid copper conductors, insulated covered, or bare, not smaller than WHAT SIZE conductor, or with rigid metal conduit of brass or other identified corrosion resistant metal. 1. 8 AWG 2. 10 AWG 3. 14 AWG 4. 16 AWG
1. 8 AWG
In buildings used for communications systems (such as telephone, CATV, internet, satellite, or data services), the bonding conductor shall be connected to which of the following? 1. at the intersystem bonding termination. 2. directly to an equipment grounding conductor. 3. to an exposed non-flexible raceway. 4. with a clamp to the grounded conductor.
1. At the Intersystem bonding termination.
An equipment grounding conductor shall be installed, where it consists of a raceway, cable tray, cable armor, cable bus framework, or ______ 1. contain a wire type grounding conductor. 2. contain a grounded wire. 3. be listed as fixture conductor. 4. be listed as switch control wire.
1. Contain a wire type grounding conductor
According to the NEC, electric vehicle supply equipment cable shall NOT be which of the following cable types? 1. EVP 2. EVJ 3. EVJE 4. EVJT
1. EVP
The National Electrical Code contains provisions for portable wiring and equipment for carnivals, circuses, fairs, and similar functions. Therefore, the service equipment for carnivals shall not be installed in a location that is accessible to unqualified persons, unless the equipment is which of the following? 1. lockable 2. guarded. 3. secured 4. GFCI protected.
1. Lockable
In addition to the number of branch circuits required by other parts of the NEC, at least one 120 volt, 20 ampere branch circuit shall be provided to supply the bathroom(s) receptacle outlet(s). These required 20-ampere branch circuits for the dwelling unit bathroom(s) receptacle outlet(s) shall be which of the following? 1. not be added to the general lighting load calculation. 2. be added to the general lighting load calculation. 3. have 20 amperes added to the general lighting load calculation. 4. have 1,500 VA added to the general lighting load calculation.
1. Not be added to the general lightning load calculation.
Readily accessible is defined as capable of being reached quickly for ________, renewal, or inspections. 1. operation 2. removal 3. maintenance 4. disconnect
1. Operation
The National Electrical Code defines electrically energized heating systems as "A system in which heat is generated on the inner surface of a ferromagnetic envelope embedded in or fastened to the surface to be heated", as which of the following? 1. Skin-Effect Heating System. 2. Surface-Tension Heating System. 3. Reluctance-Type Heating System. 4. Conductance-Type Heating System.
1. Skin-Effect Heating System.
The temperature rating of conductors are listed in Article 310 of the National Electrical Code. Therefore, of the following types of conductors, which conductor insulation type is NOT rated for 90 degrees C? 1. USE 2. THHN 3. USE-2 4. THWN-2
1. USE
The National Electrical Code states that "Photovoltaic system dc circuit labels shall appear on every section of the wiring system that is separated by enclosures, walls, partitions, ceilings, or floors. Spacing between labels or markings, or between a label and a marking, shall not be more than how many feet?" 1. 12 feet 2. 10 feet 3. 6 feet 4. 3 feet
2. 10 feet
The disconnecting means for motor circuits rated 1000 volts, nominal, or less shall have an ampere rating not less than WHAT PERCENTAGE of the full-load current rating of the motor? 1. 150% 2. 115% 3. 90% 4. 80%
2. 115%
A cable bus shall be supported at intervals in accordance with the installation and manufacturers instructions. The NEC specifically requires that a cable bus shall be securely supported at intervals not exceeding HOW MANY feet in length (excluding exceptions)? 1. 15 feet 2. 12 feet 3. 10 feet 4. 6 feet
2. 12 feet
A sign motor, generator, or other rotating electrical machinery that is driven by a 1/2 horse power motor must be a calculated at ________of the FLC rating. 1. 150 percent 2. 125 percent 3. 115 percent 4. 100 percent
2. 125 percent
Snap switches must be used within their ratings, therefore, if a general use snap switch is used as a controller (for a 2-HP 230-volt ac, 1-phase motor) what would be its minimum size requirement? 1. 10 amperes. 2. 15 amperes. 3. 20 amperes. 4. 30 amperes.
2. 15 amperes
The NEC states that the rating of any one cord-and-plug-connected utilization equipment not fastened in place shall not exceed 80 percent of the branch circuit ampere rating. Therefore, if a load is connected to a 20 ampere branch circuit, what is the maximum ampacity of the load? 1. 14 amperes 2. 16 amperes 3. 20 amperes 4. 25 amperes
2. 16 amperes
Overcurrent protection for transformers shall be calculated accordance with the National Electrical Code. Therefore, what would be the maximum standard O.C.P device for the secondary of an individual 3 phase transformer with a nameplate of 600 kVA, given the operating voltages of 480 V, 120/208 V? (Consider that the O.C.P of the primary is 250 percent.) 1. 2,300 amperes 2. 2,000 amperes 3. 1,300 amperes 4. 1,100 amperes
2. 2,000 amperes
A single motor is installed with the following conditions. However, given that the motor is tripping the current setting of the overloads, what would be the calculated new maximum setting for the separate overload device (re-adjusted value in amperes)? Operating Voltage: 230 volts - Nameplate FLC Rating: 18.0 amperes Service Factor: 1.15 - Temperature Rise: 40 Celsius -Overload Protection Setting: 22.5 amperes (is not sufficient to start the motor or to carry the load) 1. 28.1 amperes 2. 25.2 amperes 3. 22.5 amperes
2. 25.2 amperes
Equipment such as room air conditioners shall be considered appliances, and the provisions of the NEC Article 422 shall apply. Therefore, what would be the minimum required ampacity for the conductors serving the branch circuit of a single motor air conditioning unit with a nameplate rating of 21.2 amperes? 1. 37.1 amperes 2. 26.5 amperes 3. 23.3 amperes 4. 21.2 amperes
2. 26.5 amperes
According to the National Electrical Code, what would be the minimum size grounding electrode conductor required for a commercial building that is fed from a service panel rated at 1200 amperes? 1. 500 kcmil 2. 3/0 AWG 3. 6 AWG 4. 1/0 AWG
2. 3/0 AWG
What would be the standard motor branch circuit short circuit and ground fault protective device, given that the protective device is a Dual Element Time Delay Fuse for the following motor? Consider all exceptions. - Operating Voltage: 120 volts Electric Power: Single-Phase Motor Horsepower: 1.0 HP 1. 20 2. 30 3. 40 4. 50
2. 30
What would be the standard motor branch circuit short circuit and ground fault protective device, given that the protective device is a Dual Element Time Delay Fuse for the following motor? Consider all exceptions. - Operating Voltage: 120 volts - Electric Power: Single-Phase - Motor Horsepower: 1.0 HP 1. 20 2. 30 3. 40 4. 50
2. 30
What would be the MAXIMUM standard motor compressor branch circuit short circuit and ground fault protective device required for hermetic refrigerant motor compressor with a nameplate rating of 18 amperes? This compressor operates on either a 15/20 ampere, 120/208/240 volt, single-phase branch circuit, exclude any exceptions. 1. 35 amperes 2. 30 amperes 3. 25 amperes 4. 20 amperes
2. 30 amperes
Calculate the maximum standard rating overcurrent device given the conditions listed below. Using the main rule only. Operating Voltage: 230 Volts - Electric Power: Three Phase Motor Horsepower: 7.5 HP Protective Device: Dual Element Fuse 1. 60 2. 45 3. 35 4. 30
2. 45
Equipment grounding conductors shall be permitted to be sectioned within a multiconductor cable of an industrial control panel. Therefore, what would be the minimum size equipment grounding conductor for this circuit if protected by a 200 A overcurrent device? 1. 10 AWG 2. 6 AWG 3. 3 AWG 4. 1 AWG
2. 6 AWG
What is the standard disconnect rating for a molded case switch (that clearly indicates the open/off or closed/on position) considering the switch has a single load of one 10 HP, 230 VAC singe-phase motor? 1. 30 amperes 2. 60 amperes 3. 100 amperes 4. 200 amperes
2. 60 amperes
Calculate the required number of 20 ampere general lighting branch circuits for the following building: - Occupancy: Grocery Store Area: 75,000 square feet - Operating Voltage: 277/480 Volts Actual lighting load: 300,000 VA 1. 73 2. 68 3. 54 4, 40
2. 68
Emergency systems are intended to automatically supply illumination and power. These systems must be maintained, tested, and are designed to have adequate capacity and rating for which of the following? 1. any of the loads to be energized sequentially. 2. all loads to be operated simultaneously. 3. supply full load current continuously. 4. source portable or temporary alternate power sources.
2. All loads to be operated simultaneously
The National Electrical Code states "Where photovoltaic source and output circuits operating at voltages greater than 30 volts are installed in readily accessible locations, circuit conductors shall be guarded or, which of the following?" 1. Protected against physical damage. 2. Installed in a raceway or Type MC cable. 3. Allowed to be installed with the AC conductors. 4. Only permitted by the authority having jurisdiction.
2. Installed in a raceway or type MC cable
Decorative lighting and similar accessories used for holiday lighting and similar purposes, in accordance with the NEC Article 590, shall be which of the following? 1. LED type 2. listed 3. incandescent type 4. fluorescent type
2. Listed
All panelboards shall have an overcurrent protective device located within or at any point on the supply side of the panelboard. Additionally, when a panelboard is supplied through a transformer, the overcurrent protection shall be located at which of the following? 1. on the primary side of the transformer. 2. on the secondary side of the transformer. 3. at the service of the system. 4. at the feeder circuit.
2. On the secondary side of the transformer.
Where electrical equipment is rated 1,000 A or more that contains overcurrent devices, switching devices, or control devices is installed and there is a personnel door located only 20 feet away, this door shall and be equipped with listed panic hardware. 1. open in the direction of entry 2. open in the direction of egress 3. be able to be locked in the open position 4. be able to be locked in the locked position
2. Open in the direction of egress
Where electrical equipment is rated 1,000 A or more that contains overcurrent devices, switching devices, or control devices is installed and there is a personnel door located only 20 feet away, this door shall and be equipped with listed panic hardware. 1. open in the direction of entry 2. open in the direction of egress 3. be able to be locked in the open position 4. be able to be locked in the locked position
2. Open in the direction of egress
Conductor ampacity must be derated based on the installation conditions of ambient temperature, and the number of conductors ran together. Therefore, calculate the following scenario; - Size of conductor: 1/0 Insulation type: THW - Number of conductors: 3 - Ambient Temperature: 47 degrees C What would be the calculated minimum allowable ampacity of each conductor installed in the raceway? 1. 130.5 amperes 2. 125.7 amperes 3. 112.5 amperes 4. 87.0 amperes
3. 112.5 amperes
Calculate the maximum standard rating of a motor branch circuit, short circuit, or ground fault protective device given the following conditions: Armature Voltage Rating: 120 Volts Electric Power: Single Phase - - Motor Horsepower: 10 HP - Motor Type: Direct-Current, DC (constant voltage) Protective Device: Dual Element Fuse 1. 100 amperes 2. 110 amperes 3. 125 amperes 4. 150 amperes
3. 125 amperes
According to the National Electrical Code Article 210 (or Annex D examples), and after applying the necessary calculation for the selected electrical service panel, what would be the minimum size service entrance conductors for the following dwelling? - Construction Type: Single family dwelling, System Voltage: 120/240 Volt three-wire Service Service Panel Size: 175 amperes. 1. 218 amperes 2. 175 amperes 3. 145 amperes 4. 140 amperes
3. 145 amperes
Given that an office building will have a continuous lighting load of 6 hours or more, calculate the required overcurrent device for the following conditions; Source Voltage: 120/208 Volts Power: Three-phase Actual Lighting Load: 50,000 Watts 1. 225 amperes 2. 200 amperes 3. 175 amperes 4. 150 amperes
3. 175 amperes
The size of the grounding electrode conductor at the service at each building or structure is determined by the size of the service entrance conductor, therefore, if the service uses 350 kcmil aluminum conductors, what size copper grounding electrode would be required? 1. 6 AWG. 2. 4 AWG. 3. 2 AWG. 4. 1/0 AWG.
3. 2 AWG
According to the National electrical code, use the tables and articles to solve for the following minimum size: - Grounding Electrode Conductor - Supplemental Electrode Bonding Jumper Assume the service of 400 amps is fed from two parallel runs 3/0 AWG copper conductors in separate raceways, and the jumper bonds the water pipe to the ground rods. 1. 6 AWG and 6 AWG 2. 1/0 AWG and 6 AWG 3. 2 AWG and 6 AWG 4. 3/0 AWG and 6 AWG
3. 2 AWG and 6 AWG
If a listed resistance-type instantaneous water heater (or steam boiler) is a feeder load of 144,000 Watts, and is operating at 480 volts three-phase, how many individual dedicated branch circuits would be required for this appliance installation? 1. 7 circuits 2. 5 circuits 3. 2 circuits 4. 1 circuit
3. 2 circuits
spray application operations are conducted within a closed-top, open-face, or open-front booth or room, any electrical wiring or utilization equipment located outside of the booth or room but within HOW MANY FEET of any opening shall be suitable for Class I, Division 2? 1. 12 feet 2. 6 feet 3. 3 feet 4. 2 feet
3. 3 feet
A motor overload intended to protect a motor compressor with a rating of 22.5 amps, is what maximum fuse size? 1. 50 amperes 2. 40 amperes 3. 30 amperes 4. 20 amperes
3. 30 amperes
Power outlets used as mobile home service equipment shall also be permitted to contain receptacles rated up to HOW MANY with appropriate overcurrent protection. 1. 20 amperes 2. 40 amperes 3. 50 amperes 4. 70 amperes
3. 50 amperes
All manual switches for controlling emergency circuits (in theater, assembly, and motion picture) shall be in locations convenient to authorized personnel, located in the lobby or at a place conveniently accessible. The control of emergency systems shall comply with which Article of the National Electrical Code? 1. 518 2. 520 3. 700 4. 800
3. 700
According to the National Electrical Code in Article 310 (unless specifically elsewhere in the code), conductors installed in raceways of what size and larger shall be stranded? 1. 2 AWG 2. 4 AWG 3. 8 AWG 4. 14 AWG
3. 8 AWG
What would be the calculated minimum size feeder circuit conductors for Multiple Motors on the same feeder given the following conditions? - Operating Voltage: 230 volts - Electric Power: Three-Phase - Motor Types: Design B Motor 1: 10 HP, nameplate rating of 24 amperes. Motor 2: 2 HP, nameplate rating of 4.7 amperes. 1. 1 AWG 2. 3 AWG 3. 8 AWG 14. 10 AWG
3. 8 AWG
Use Ohm's Law to calculate what the total resistance of a circuit that has a resistive load of one single appliance. The appliance has a nameplate rating of 13.0 amperes, and a load of 1.44 kW, but the operating source voltage is unknown. 1. 111 Ohms 2. 12 Ohms 3. 8.5 Ohms 4. 6.2 Ohms
3. 8.5 Ohms
Each commercial building and each commercial occupancy accessible to pedestrians shall be provided with at least HOW MANY 20 ampere outlet(s) in an accessible location at each entrance to each tenant space for sign or outline lighting system use? 1. Three 2. Two 3. One 4. Zero
3. One
What type of jumper is required for a generator of a separately derived system, either at the generator, or at the first disconnecting means or overcurrent device? 1. Equipment bonding jumper 2. Service bonding jumper 3. System bonding jumper 4. Main bonding jumper
3. System bonding jumper
The National Electrical Code has a voltage limitation for all luminaires in fountains, and states "No luminaires shall be installed for operation on supply circuits over _____ between conductors." 1. 50 volts 2. 115 volts 3. 120 volts 4. 150 volts
4. 150 volts
Luminaires mounted in walls shall be installed with the top of the luminaire lens not less than HOW MANY inches below the normal water level of the pool, unless the luminaire is listed and identified for use at lesser depths? 1. 3 inches 2. 6 inches 3. 12 inches. 4. 18 inches
4. 18 inches
What is the total calculated load in watts of One (1) photovoltaic panel considering the following conditions? - System Design: 2 solar photovoltaic panels - System Voltage: 240 volts Panel Configuration: 10 modules connected in series, per panel Module Voltage: 24 volts - Module Wattage: 43 Watts 1. 24 Watts 2. 43 Watts 3. 240 Watts 4. 430 Watts
4. 430 watts
Given that a 120 V lamp has a filament resistance of 25 Ohms, and is controlled by a rheostat in series, what would be the resistance of the rheostat that would allow for a maximum of 4 amperes through the circuit? 1. 30 Ohms 2. 15 Ohms 3. 10 Ohms 4. 5 Ohms
4. 5 Ohms
A bonding jumper that ensures the required electrical conductivity between metal parts is installed on the supply side of a transformer shall be WHAT SIZE, given that the transformer secondary conductors are 1/0 AWG? 1. 1/0 AWG 2. 2 AWG 3. 4 AWG 4. 6 AWG
4. 6 AWG
The ampacity for conductors must be derated for ambient temperatures using the correction factor tables of the National Electrical Code. Therefore, what would be the maximum conductor ampacity permitted given the following installation? - Number of conductors: 1 Conductor Insulation: THHN Conductor Size (AWG): 6 AWG Ambient Temperature: 117 degrees F 1. 30.8 amperes 2. 43.5 amperes 3. 56.3 amperes 4. 61.5 amperes
4. 61.5 amperes
A commercial installation is designed with Primary Only Protection for the system transformer. The rated power of the transformer is 45,000 VA, primary operating at 480 volts three-phase, and has a 120/208 volt secondary. Therefore, what would be the MAXIMUM standard primary overcurrent protective device? 1. 200 amperes 2. 110 amperes 3. 90 amperes 4. 70 amperes.
4. 70 amperes
Equipment that requires a single phase 240-volt circuit shall be protected by a ________with identified handle ties, shall be permitted as the protection for each ungrounded conductor of multiwire branch circuits that serve only single-phase line-to-neutral loads. 1. GFCI 2. 3 pole breaker 3. 2 pole breaker 4. AFCI breaker
4. AFCI breaker
The National Electrical Code states that "Motor and motor-operated equipment receiving electric energy from more than one source shall be provided with disconnecting means from each source of electric energy _________ 1. within sight of the equipment 2. completely isolated from the equipment. 3. within 50 feet of the equipment being served. 4. immediately adjacent to the equipment served.
4. Immediately adjacent to the equipment served.
Each multi-wire branch circuit MUST be provided with a means to disconnect all ungrounded conductors 1. safely. 2. continuously. 3. individually. 4. simultaneously.
4. Simultaneously
The NEC provides practical safeguarding for flexible cords and cables. Given, a flexible multiconductor hard service cord contains only three conductors, Thermoset Type SOO size 8 AWG, that only 2 conductors carry current. What would be the maximum ampacity of each current carrying conductor? 1. 20 amperes 2.25 amperes 3. 35 amperes 4. 40 amperes
4.40 amperes
Given: A metallic conduit containing three current-carrying conductors is installed on supports 5 inches above the rooftop and exposed to direct sunlight. When calculating conductor ampacity, how many degrees F will be added for determining the ambient temperature? 1. 0 2. 30 3. 75 4. 90
1. 0
Given that the following 13 conductors of different sizes will be installed in electrical metallic tubing, what would be the MINIMUM size conduit permitted by the NEC? (4) #3 AWG THW (6) #12 AWG THHN (3) #8 AWG THW 1. 1-1/2 inches 2. 1-1/4 inches 3. 1 inches 4. 1-3/4 inches
1. 1-1/2 inches
Given: A commercial building with a 3-wire, single-phase, 120/240-volt service has a total load of 35,000 VA after all demand factors have been considered the minimum size THWN copper conductors required for the ungrounded service conductors is _______AWG. 1. 3 2. 1/0 3. 2/0 4. 3/0
1. 1/0
Given this scenario: 36 kVA total power, 120/208-volt wye balanced load. What is the calculated line current for a line conductor serving a 3-phase load which is 12 kVA per phase? (To the nearest ampere) 1. 100 2. 125 3. 134 4. 173
1. 100
A 3-phase, 240-volt delta system is balanced with a 15-kVA load per phase. What is the line current in amperes? (45,000 VA total load) 1. 108.2 2. 120.4 3. 144.3 4. 249.3.
1. 108.2
An installation of 40 feet of a fixed multi-outlet assembly, for appliances unlikely to be used simultaneously, installed in a continuous length in an office occupancy, must be calculated at what total ampere load, given a source of 120 volts single-phase? 1. 12 amperes 2. 16 amperes 3. 20 amperes 4. 30 amperes
1. 12 amperes
The starting and running voltage drop of a fire pump must be limited using a minimum conductor rated at how many amperes, considering that the pump and its associated loads draw 120 amperes during normal operation? 1. 150 amperes. 2. 138 amperes. 3. 125 amperes. 4. 90 amperes.
1. 150 amperes
A installation of a 75-kVA transformer with a 480-volt primary and 208/120 volt, three-phase, four-wire secondary would have a maximum primary current of 90 amps and a maximum secondary current of 208 amps. Therefore, the secondary conductors using 75 degrees Celsius insulated conductors would be required to be what minimum size copper? 1. 4/0 AWG 2. 3/0 AWG 3. 1/0 AWG 4. 3 AWG
1. 4/0 AWG
What would be the standard fuse rating overcurrent protective device for a 50 HP, 480 V, fire pump motor power that is connected through a disconnecting means located outside a building? 1. 400 amperes 2. 250 amperes 3. 100 amperes 4. 65 amperes
1. 400 amperes
Calculate the minimum size branch circuit conductors for a single motor given the following conditions: Operating Voltage: 480 volts Electric Power: Three-Phase. Type of Motor: Squirrel cage, Design B Motor Horsepower: 20.0 HP - Nameplate Rating: 21.0 amperes - Conductor Rating: 60 degrees - Terminal Rating: 75 degrees 1. 8 AWG 2. 10 AWG 3. 12 AWG 4. 14 AWG
1. 8 AWG
Swimming pool parts shall be bonded together using solid copper conductors, insulated covered, or not smaller than WHAT SIZE conductor, or with rigid metal conduit of brass or other identified corrosion, resistant metal. 1. 8 AWG 2. 10 AWG 3. 14 AWG 4. 16 AWG
1. 8 AWG
What would be the minimum permitted inverse time breaker (that serves as the disconnecting means) for a 50 HP, 460 volt, 3-phase motor that is driven by an adjustable speed power conversion equipment with a nameplate of 75 amperes? 1. 90 amperes 2. 100 amperes 3. 125 amperes 4. 150 amperes
1. 90 amperes
When exposed to the outside weather conditions, feeder and branch circuit raceways that enter or exit a building shall be listed or approved for use in which of the following? 1. wet locations and arranged to drain. 2. water tight installations. 3. corrosion resistant locations. 4. water proof applications.
1. Wet locations and arranged to drain.
What would be the standard fuse rating overcurrent protective device for a 50 HP, 480 V, fire pump motor power that is connected through a disconnecting means located outside a building? Assume the locked rotor current is 6 kVA per horsepower. 1. 400 amperes 2. 250 amperes 3. 100 amperes 4. 65 amperes
1.400 amperes
Given this scenario: Four 6 AWG TW, three 10 AWG THHN, and five 8 AWG THHN. Calculate the cross-sectional area, in square inches, for the above combination of copper conductors. 1. 0.4453 2. 0.5367 3. 1.925 4. 2.346
2. 0.5367
The cross-sectional area of 10 copper conductors is 0.836 sq-in. The 10 conductors are contained in an 18-in run of RMC between cabinets. The minimum size RMC required for the 10 conductors is _____inches? 1. 1 2. 1-1/4 3. 1-1/2 4. 2
2. 1-1/4
Calculate the maximum standard rating (not to exceed the value calculated) of a motor branch circuit, short circuit, or ground fault protective device given the following conditions: Operating Voltage: 480 volts Electric Power: Three Phase Motor Horsepower: 30 HP - Motor Type: Design B energy efficient - Protective Device: Inverse Time Breaker 1. 90 amperes. 2. 100 amperes.. 3. 110 amperes. 14 125 amperes.
2. 100 amperes.
For a 15-ampere AC general-use snap switch which serves as the controller for a stationary 2-HP, 240-volt motor, the maximum motor full-load current permitted is ______ amperes. 1. 10 2. 12 3. 15 4. 20
2. 11
The disconnecting means for a 3-phase, 240-volt, 3-HP, wound rotor motor shall be rated at a minimum of_______ amperes. 1. 9.60 2. 11.0 3. 14.4 4. 24.0
2. 11.0
Given: Transformer is 150 kVA, transformer existing load is 220 amperes per phase; and voltage is 208Y/120, 3 phase. What approximate additional single phase load per phase may be added to the transformer? 1. 180 amperes 2. 196 amperes 3. 416 amperes 4. 501 amperes
2. 196 amperes
According to the National Electrical Code, what would be the calculated minimum trade size for a rigid metal conduit (RMC) that contains only two (2) 250 kcmil THHN conductors? 1. 3 inches 2. 2 inches 3. 1 1/2 inches 4. 1 inch
2. 2 inches
If a 20-ft feeder tap for lighting has an ampacity of 100 amperes, what is the maximum ampere rating permitted for the overcurrent protection device protecting the feeder conductors? 1. 150 amperes 2. 300 amperes 3. 600 amperes 4. 750 amperes
2. 300
Calculate the service load in amperes for the portion of a recreational vehicle site that has 14 vehicle sites if the sites are all equipped with 50 ampere, 120/240 volt supply facilities? Assume that no facilities are dedicated to tent sites. 1. 590 amperes 2. 336 amperes 3. 202 amperes 4. 135 amperes
2. 336 amperes
Consider a parallel circuit diagram of three bulbs, and calculate the total current drawn in amperes if the three lamps are connected in to a 120 VAC source. The three loads are as follows: Bulb 1 120 Watts - Bulb 2 = 300 Watts -Bulb 3 = 300 Watts 1. 3.00 amperes 2. 6.00 amperes 3. 8.00 amperes 4. 12.00 amperes
2. 6.00 amperes
The National Electrical Code covers installations operating at less than 50 volts, direct current or alternating current. Therefore, standard lampholders that have a rating of not less than HOW MANY WATTS shall be used. 1. 750 watts 2. 660 watts 3. 400 watts 4. 300 watts
2. 660 watts
Given: A dwelling unit with 3,000 sq. ft. of habitable space with laundry facilities and bathrooms, 600 sq. ft. of garage, and 1,000 sq. ft. of unfinished habitable space that is adaptable to future use. When calculating the service-conductor size for this dwelling unit using the STANDARD calculation method the minimum demand is _____ volt-amperes. 1. 6,150 2. 7,725 3. 12,000 4. 16,500
2. 7,725
Calculate the minimum conduit for the following THHN conductors: - (9) #12 AWG - (5) #3 AWG Using Liquid tight Flexible Nonmetallic Conduit Type-A (which has a smooth seamless inner core and cover bonded together), the installation would require what minimum trade size LFNC-A? 1.1 2. 1-1/4 3. 1-1/2 4. 2
3. 1-1/2
Calculate the minimum conduit for the following THHN conductors: (3) 1/0 AWG current carrying conductors (1) #6 AWG equipment grounding conductor What would the minimum size trade size be if the run will consist of both EMT and FMC raceways? 1. 1 inch 2. 1-1/4 inch 3. 1-1/2 inch 4. 2 inch
3. 1-1/2 inch
For a branch circuit that serves a short-time duty, 60 minute-rated motor that has a nameplate current rating of 20 amperes and all terminal connections rated for 75 degrees C, the minimum size THWN copper conductor is _____AWG. 1. 6 2. 8 3. 10 4. 12
3. 10
The motors section 430 of the NEC does cover circuits over 1000 Volts nominal. Therefore, the ultimate trip current of overcurrent relays or other motor protective devices used shall not exceed WHAT PERCENTAGE of the controller's continuous current rating? 1. 200 % 2. 175 % 3. 115 % 4. 80 %
3. 115 %
Given: A dwelling unit with 3,000 sq. ft. of habitable space and bathrooms, 600 sq-ft of garage, and 1,000 sq. ft. of unfinished habitable space that is adaptable for future use when calculating the service-conductor size for this dwelling unit using the OPTIONAL calculation method, the minimum demand is _______volt-amperes. 1. 7,725 2. 11,400 3. 12,600 4. 13,320
3. 12,600
A 100 horsepower motor is fed by a 480 Volt, 3 phase feeder. Calculate the motor current supplied by the feeder, using 1,000 Watts per horsepower since the motor is not 100% efficient. 1. 156 amperes. 2. 124 amperes. 3. 120 amperes. 4. 96 amperes.
3. 120 amperes
Given this scenario: The primary plus secondary tap is 22 feet in length; the main feeder is 111 amperes; and the feeder overcurrent protection is 125 amperes. When a transformer feeder tap is made, the minimum ampacity permitted for the tap conductors is how many amperes? 1. 20 2. 37 3. 42 4. 125
3. 42
What would be the calculated standard overcurrent inverse time circuit breaker given a feeder load of ten (10) 15 HP, 460 V three-phase motors? 1. 175 amperes 2. 200 amperes 3. 225 amperes 4. 300 amperes
3. 225 amperes
Using non-time-delay fuses, what is the maximum size branch circuit overcurrent protection for a 3/4 HP, single-phase, 240 Volt pump motor? 1. 10 amperes 2. 15 amperes 3. 25 amperes 4. 30 amperes
3. 25 amperes
A 3-phase system serves three separate 1,800 VA lighting loads (one on each phase) and a 3-phase, 208 volt, 7,206 VA motor load. What is the line current, in amperes? 1. 15 2. 20 3. 35 4. 43
3. 35
For a hermetic refrigerant-motor compressor with a rated load current of 20 amperes, where the branch-circuit protection specified is sufficient for the starting current, the maximum permitted rating for the branch-circuit protective device is _______amperes. 1. 25 2. 30 3. 35 4. 45
3. 35
In electrical metallic tubing there shall not be more than four quarter bends, which is equivalent to HOW MANY degrees total between pull points, for example, conduit bodies and boxes. 1. 120 2. 240 3. 360 4. 720
3. 360
The National Electrical Code states that a dwelling load should be evenly proportioned among branch circuits of the service. This load can be calculated on the basis of volt-amperes per square foot. Therefore, what would be the minimum number of general use 120V/15A circuits required for a dwelling of 25,117 sq-ft? Do not included any derating adjustments for demand factors. 1. 24 circuits 2. 38 circuits 3. 42 circuits 4. 52 circuits
3. 42 circuits
Calculate the service load in volt amperes for the portion of a recreational vehicle site that has 32 sites (specific areas set aside for use by a camping unit) if the sites are all supplied with 20 ampere and 30 ampere supply facilities? 1. 161,280 VA 2. 129,024 VA 3. 48,384 VA 4. 32,256 VA
3. 48,384 VA
Given: Three motors with full load ampere ratings of 10 amperes, 20 amperes, and 30 amperes are fed by one feeder. The motor feeder conductors must have an ampacity of at least _____amperes. 1. 37.5 2. 60.0 3. 67.5 4. 75.0
3. 67.5
Given: a wound-rotor, no-code-letter, 2-HP, single-phase, 115-volt motor has branch-circuit conductors that are protected by a non-time delay fuse. (Assume the maximum non-time delay fuse rating, when tried, will not hold the starting current). What is the maximum rating for the motor branch-circuit? 1. 70 2. 80 3. 90 4. 100
3. 90
A room within the information technology equipment area that contains the information technology equipment, must have all exposed non-current-carrying metal parts the system______ in accordance with Article 250 of the National Electrical Code? 1. tagged and identified as part of the grounded system 2. isolated from the equipment grounding conductor 3. bonded to the equipment grounding conductor 4. grounded at both ends of the conduit or raceway
3. Bonded to the equipment grounding conductor
What would be the calculated circuit ampacity given the following combination of 120 volt loads; (1) One motor rated at 3.3 amperes (2) One receptacle rated at 180 VA (3) One lighting circuit rated at 7.0 amperes (non-continuous) 1. 11.8 amperes 2. 10.3 amperes 3. 13.5 amperes 4. 12.6 amperes
4. 12.6 amperes
For installations to supply only limited loads of a "single branch circuit" (such as an irrigation controller), the service disconnecting means shall have a rating of not less than HOW MANY amperes? 1. 100 amperes 2. 60 amperes 3. 30 amperes 4. 15 amperes
4. 15 amperes
Calculate the maximum standard rating of a motor branch circuit, short circuit, or ground fault protective device given the following conditions: - Operating Voltage: 120 volts Electric Power: Single Phase - Motor Horsepower: 5 HP - Motor Type: Alternating-Current (AC polyphase motors) - Protective Device: Inverse Time Breaker 1. 125 amperes 2. 140 amperes 3. 145 amperes 4. 150 amperes
4. 150 amperes
A 200 amp transfer switch serves a 120/240 V, 20 kW generator. If the conductors are terminating on a 75 C terminal, 100 amp overcurrent device, what would be the minimum size conductors required? 1. 3/0 AWG 2. 1/0 AWG 3. 2 AWG 4. 3 AWG
4. 3 AWG
Given: A dwelling with a 3-wire, single-phase 120/240-volt service has a total load of 35,000 VA after all demand factors have been considered. The minimum size THWN aluminum conductors required for the service entrance for this dwelling is _______ AWG. 1. 1 2. 1/0 3. 2/0 4. 3/0
4. 3/0
Calculate the maximum standard rating of a motor branch circuit, short circuit, or ground fault protective device given the following conditions: - Operating Voltage: 230 volts Electric Power: Single Phase - Motor Horsepower: 2 HP Motor Type: Alternating-Current (AC polyphase motors) - Protective Device: Inverse Time Breaker - 75-degree terminals, 14 AWG conductors 1. 60 amp 2. 50 amp 3. 40 amp 4. 30 amp
4. 30 amp
Given: On a 480/240-volt step-down transformer, the primary current is 200 amperes. The approximate secondary current is _______ amperes. 1. 100 2. 2001 3. 300 4. 400
4. 400
Given this scenario: A junction box containing a combination of conductors, all part of the same system. The conductors include three 6 AWG ungrounded conductors, one 8 AWG equipment grounding conductor, three 6 AWG grounded conductors, three 12 AWG ungrounded conductors, one 12 AWG grounding conductor, three 12 AWG grounded conductors, and two clamps. This junction box must be at least how many cubic inches? 1. 40.5 2. 43.5 3. 46.5 4. 51.5
4. 51.5
According to the National Electrical Code, what would be the calculated minimum trade size equipment grounding conductor required to protect one 5 HP, 208 V, 3-phase motor? Consider all the exceptions for rating or setting for individual motor circuits, and the use of an instantaneous trip breaker. 1. 2 AWG 2. 3 AWG 3. 4 AWG 4. 6 AWG
4. 6 AWG
Given: Conductor size is 14 AWG; conductor material is copper (use K=12.9) the length of the circuit conductors one way from the source to the load is 100 ft. current flow is 10 amperes; and circuit voltage is 120 single phase. Determine the voltage drop caused by the circuit conductors. 1. 3.1 2. 3.6 3. 5.1 4. 6.3
4. 6.3
For purposes of determining allowable ampacity of conductors, where the conductors are installed in conduit up to 7/8-inch. above a rooftop exposed to direct sunlight, the average outdoor temperature of a specific geographical location shall be increased by how many degrees F? 1. 25 2. 30 3. 40 4. 60
4. 60
Given this scenario: The cooktop is 12,000 volt-amperes. The minimum copper conductor size allowed for a 240-volt branch circuit which supplies a single cooktop is how many AWG. (Assume NM cable and single-phase dwelling.) 1. 3 2. 4 3. 6 4. 8
4. 8
According to the National Electrical Code, if a remote control device is used to actuate the service disconnecting means, the service disconnecting means shall be located at which of the following? 1. at a remote location. 2. at a clearly identified location. 3. at an easily accessible location. 4. at a readily accessible location.
4. At a readily accessible location.
Outlets supplying pool pump motors connected to single-phase, 120 volt through 240 volt branch circuits, whether by receptacle or by direct connection, shall be provided with which of the following? 1. Ground-fault circuit-interrupter protection for personnel 2. Ground-fault protection for the equipment 3. Arc-fault circuit-interrupter protection for personnel 4. Arc-fault protection for the equipment
1. Ground-fault circuit-interrupter protection for personnel
Given: The lighting load for an assembly hall with an area of 2,000 sq. ft. is served with a 120/240-volt, single-phase panel and no other electrical loads are served from this panel. The lighting load is continuous and the load is balanced and at the minimum required for the load as specified by NEC. Calculate the feeder neutral load in amperes. 1. 8.3 2. 10.4 3. 16.6 4. 20.8
2. 10.4
Given: A 120/208 volt, 3 phase wye system has a total load of 36 kVA. The calculated line current on the conductors serving this load is ______amperes. 1. 58 2. 100 3. 173 4. 300
2. 100
If all conductors carry current, the maximum allowable ampacity for each of four THW 1/0 copper conductors in a single raceway with ambient temperatures of 86 degrees F. is how many amperes. 1. 100 2. 120 3. 125 4. 150
2. 120
What would be the required standard OCPD rating given an installation is designed with a 75,000 VA transformer with a 480 Volt primary, 208/120 Volt secondary? Assume that the secondary will not have overcurrent protection (primary protection only). 1. 150 amperes 2. 125 amperes 3. 115 amperes 4. 95 amperes
2. 125
The branch circuit conductors supplying a three-phase duct heater rated 7,500 watts at 480-volts shall NOT be smaller than 1. 16 AWG. 2. 14 AWG. 3. 12 AWG. 4. 10 AWG.
2. 14 AWG.
According to the National Electrical Code, what would be the minimum burial depth requirement for a direct buried type UF cable that is use to source a 120 volt single-phase lighting circuit for a commercial office building parking lot? 1. 30 inches 2. 24 inches 3. 20 inches 4. 16 inches
2. 24 inches
Assume that a 230 volt single-phase power is available, what size THWN aluminum service entrance. conductors are required for the following farm loads? - main dwelling load = 102 amperes; barn load = 72 amperes; equipment shed load = 41 amperes 1. 4/0 AWG 2. 250 kcmil 3. 300 kcmil 4. 400 kcmil
2. 250 kcmil
Calculate the minimum size service THW copper conductors given the following senario. - Service power configuration: Three-phase, four-wire. - Service conductors: Connected in parallel, three per phase. Overcurrent Protection: Four devices with sum total of 1,000 amperes. - Total calculated load: 710 amperes. 1. 500 kcmil 2. 250 kcmila 3. 4/0 AWG 4. 3/0 AWG
2. 250 kcmil
Equipment such as room air conditioners shall be considered appliances, and the provisions of the NECArticle 422 shall apply. Therefore, what would be the minimum required ampacity for the conductors serving the branch circuit of a single motor air conditioning unit with a nameplate rating of 21.2 amperes? 1. 37.1 amperes 2. 26.5 amperes 3. 23.3 amperes 4. 21.2 amperes
2. 26.5 amperes
A restaurant has a 120/240 volt, single-phase sub panel serving only the following loads three 6 KVA ovens, two 4 kVA fryers, and three 3 kVA food display units. What size THW copper feed is required in this situation? 1. 4 AWG 2. 3 AWG 3. 1 AWG 4. 1/0 AWG
2. 3 AWG
Type AC cable shall be supported and secured by staples or other approved means at intervals not exceeding how many feet? 1. 6-1/2 feet 2. 4-1/2 feet 3. 3-1/2 feet 4. 2-1/2 feet
2. 4-1/2 feet
Given: A 25-unit mobile home park has a single-phase 120/240-volt service. The calculated load for each mobile home is 15,000 VA. This mobile home park must have a service of at least amperes. 1. 350 2. 400 3. 1,600 4. 1,700
2. 400
Given: In a mobile home park, the computed load for each mobile home is 15,000 VA and the park will have twenty five mobile homes. The service will have a single-main, 120/240 volt service. The electrical service required for this mobile home park shall be at least ______ amperes. 1. 350 2. 400 3. 1600 4. 1700
2. 400
The maximum rating for the motor-branch circuit, short circuit, non-time-delay fuse that protects a wound-rotor, 2-HP, single-phase, 115-volt motor is ______ amperes. (Assume the lower standard rating when tried will not hold the starting current.) 1. 25 2. 45 3. 60 4. 80
2. 45
Given, SIX sets of ungrounded supply conductors are paralleled in six separate four inch raceways. Assume the 3-phase and neutral supply conductors for this installation are size 600 kcmil conductors in each raceway. What would be the MIMIMUM supply side bonding jumper required for the service? 1. 600 kcmil 2. 500 kcmil 3. 400 kcmil 4. 350 kcmil
2. 500 kcmil
Given: For a 41-unit apartment complex, a new 4,500-watt electric clothes dryer will be installed in each unit. For calculating the service load for the 41-unit apartment complex, the calculated load to be used for all the clothes dryers is _____VA, and the minimum load for the neutral conductor is______ VA. 1. 47,970 33,579 2. 53,300 37,310 3. 184,500 129,150 4. 205,000 143,500
2. 53,300 37,310
What would be the calculated total demand load for an office building with the following multi-outlet assembly appliances? Appliances that are unlikely to be used simultaneously: One (1) run of 20 feet. Appliances that are likely to be used simultaneously: None. 1. 900 VA 2. 720 VA 3. 180 VA 4. 90 VA
2. 720 VA
A 3-phase, 480-volt delta system is balanced with a 30-kVA load per phase. What is the line current, given an actual 80,000-VA total load? 1. 62.50 amperes 2. 96.22 amperes 3. 108.25 amperes 4. 166.66 amperes
2. 96.22 amperes
Fixture wires that are intended to be used as ________conductors shall be identified by one or more continuous white stripes on other than green insulation or by other approved means? 1. grounding 2. grounded 3. ungrounded 4. switched
2. Grounded
Wiring and conductors for cranes and hoists of moving parts are required to be supported at the end of the equipment with which of the following? 1. Enclosed in raceways. 2. Strain insulators. 3. Flexible clamps. 4. Rigid clamps.
2. Strain insulators
All transformers shall be protected by an individual overcurrent device installed in series with each ungrounded input conductor. Therefore, if the transformer does NOT have secondary overcurrent protection, what would be the minimum required standard size of the primary only overcurrent protective device? Assume the transformer is rated at 112,500 VA, 480 V, 3-phase. 1. 195 amps 2. 180 amps 3. 175 amps 4. 170 amps
3. 175 amps
Clearance of open conductors (such as a 240 volt Sign Service) shall be HOW MANY feet over public streets, alleys, roads, parking areas subject to truck traffic, driveways and other land traversed by vehicles, such as cultivated, grazing, forest, orchard, or over railroad tracks? 1. 24 feet 12. 20 feet 3. 18 feet 4. 15 feet
3. 18 feet
Calculate the minimum load after applying all demand factors for the following office building; Open areas: 50 (15A) general use receptacle outlets. - Private offices: 4 (15A) general use receptacle outlets, in each of the 10 offices (40 total). - Bathrooms: 3 (20A) general use receptacle outlets, in each of the 4 bathrooms (12 total). - Breakroom: 4 (20A) general use receptacle outlets. 1. 9,540 volt amperes 2. 14,310 volt amperes 3. 19,080 volt amperes 4. 23,850 volt amperes
3. 19,080 volt amperes
Given: A conduit containing three current-carrying conductors of 500 kcmil copper with 75-degree C insulation is installed 2 in. above the roof and exposed to sunlight with a beginning ambient temperature of 86 degrees F. What is the allowable ampacity of the 500 kcmil conductors? 1. 255 2. 312 3. 380 4. 635
3. 380
A forty-site recreational vehicle park with no dedicated tent sites contains the required number of 20, 30, and 50 ampere receptacles that must be provided. What would be the correct standard service size panel for this RV park? 1. 246 amperes 2. 320 amperes 3. 400 amperes 4. 600 amperes
3. 400 amperes
Calculate, how many single-pole 15-ampere branch circuits are needed for lighting in a 3,000 sq-ft house with a 120/240-volt service? 1. 3 2. 4 3. 5 4. 6
3. 5
Disregarding exceptions, the maximum overcurrent protection for the primary of a 240-volt transformer with a primary current of 40 amperes is ______ amperes. 1. 30 2. 40 3. 50 4. 60
3. 50
According to the NEC, what would be the calculated standard ampere rated fuse size for a service station sub-panel that has a feeder with two ungrounded conductors in connected parallel? Assume the parallel conductors are insulated with THWN, size 350 kcmil copper conductors. 1. 350 amperes 2. 450 amperes 3. 500 amperes 4. 550 amperes
3. 500 amperes
Given: A 3-phase system has a line current of 150 amperes and a line voltage of 208 volts. Determine the total volt-ampere load for the above. 1. 18,000 2. 31,200 3. 54,040 4. 93,600
3. 54,040
The receptacle load on the service must be calculated in accordance with the articles and tables of the National Electrical Code. Therefore, what would be the calculated demand load for the receptacles of a commercial building given the following details? Receptacle Demand: 108,300 VA - Lighting Load: 50,800 VA 1. 180,400 VA 2. 93,800 VA 3. 59,150 VA 4. 50,800 VA
3. 59,150 VA
Branch circuits that supply signs shall be rated in accordance with the National Electrical Code and shall be considered to be continuous loads for the purposes of calculations. Therefore, what would be the calculated branch circuit rating given the following variables? - Sign rating: 20 A -Operating Voltage: 240 volts - Duty Cycle: 12 hour intervals 1. 4,000 VA 2. 5,000 VA 3. 6,000 VA 4. 7,000 VA
3. 6,000 VA
Disregarding any exceptions, the maximum permitted operational setting of an adjustable inverse-time breaker protecting a 10-HP, 208-volt, 3-phase, squirrel-cage motor-branch circuit is _______ amperes . 1. 30.8 2. 53.9 3. 77.0 4. 246.4
3. 77.0
For a stationary motor rated at 1 hp, 240 volts, the controller shall be permitted to be a general use snap switch where the motor full load current rating (FLC) is not more than WHAT PERCENTAGE of the ampere rating of the switch? 1. 50 percent 2. 75 percent 3. 80 percent 4. 125 percent
3. 80 percent
Ground fault circuit interrupter protection for personnel shall be provided in all of the following locations EXCEPT which one? 1. Small appliance on a counter top located more than 6 feet from the sink 3. Kitchen refrigerator more than 6 feet from the sink 2. Freezer in the garage 4. Garage door opener
3. Kitchen refrigerator more than 6 feet from the sink
Sign outlets must be in an accessible location external to the commercial occupancy. These outlets shall be supplied by a branch circuit rated at least 20 amperes that supplies no other loads. Excluding any exceptions, what would be the maximum ampacity on the sign branch circuit breaker? 1. 30 amperes 2. 25 amperes 3. 20 amperes 4. 16 amperes
4. 16 amperes
According to the NEC multiple clothes dryers are permitted to be derated by a factor less than 100%, therefore, if a multi-family dwelling has five electric clothes dryers installed, what would be the total calculated demand load for this installation after derating is applied. 1. 31,250 VA 2. 29,411 VA 3. 25,000 VA 4. 21,250 VA
4. 21,250 VA
Calculate the MINIMUM feeder range load by applying the demand factors in accordance with the correct NEC Table and any applicable footnotes, given an installation contains the following: - Construction Type: Single family dwelling, - Service: 120/240 Volt three-wire feeder, - Power: Single-phase - Number of Ranges: 23 - Nameplate Rating: 3,000 Watts 1. 25.63 kW 2. 24.52 kW 3. 23.41 kW 4. 22.08 kW
4. 22.08 kw
Infrared heating lamps shall be permitted with lampholders of the medium-base, unswitched porcelain type or other types (such as incandescent) identified as suitable for use with infrared heating lamps rated at how many watts or less? 1. 1000 Watts 2. 750 Watts 3. 660 Watts 4. 300 Watts
4. 300 watts
Given: On a 480/240-volt step-down transformer, the primary current is 200 amperes. In amperes the approximate secondary current is 1. 100 2. 200 3. 300 4. 400
4. 400
