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Electric Vehicle Charging System Exam( Quiz 1- 7 ) :
Questions & Answers
(NEC - 2nd Ed) Which of the following describes an EV drivetrain architecture in which power can be transmitted to the drive from two sources at the same time? a.Full electric drive b.Parallel hybrid drive c.Series hybrid drive d.3-phase series drive (Ans- Parallel hybrid drive What types of commercial/industrial vehicles are currently available in an electrified version? (Ans- Cargo and material-hanling equipment Delivery vans and buses Semi-trailer trucks
Forklifts, yard tractors, and drayage trucks are all examples of?. (Ans- Cargo-handling equipment Charging methods for battery electric buses include which of the following? a.Above/below bus charging wireless charging b.Plug-in charging c.Wireless power transfer d.All of the above (Ans- All of the above Fleet vehicle battery capacity has reached upward of? for heavy duty vehicles. (Ans- 550 kWh Charging is defined as which of the following? a.Refilling brake fluid in an EV b.Removing the batteries from an EV and placing them inside charging equipment c.Replacing batteries in an EV d.Supplying power (kW) to an EV battery
Later in the development of EV charging equipment, the actual charging means was accomplished by a(n)? that converts AC to DC to be used in charging the vehicle's battery. (Ans- rectifier Electric vehicle supply equipment (EVSE) provides which of the following safety features? Select one: a.A continuously energized output b.GFCI protection c.Hardware fault detection d.Both b. and c. (Ans- Both B and C True or False: EVSE provides DC power to the electric vehicle charging port. (Ans- False DC charging equipment provides DC directly to? in an EV. (Ans- Battery management systems
The Society of Auto Engineers (SAE) creates standards for which of the following? Select one: a.Maximum current and voltage specifications for EVSE b.Plug configuration c.Safety features d.All of the above (Ans- All of the above An AC charger with a single-phase 120-volt connection and 14- 16 amperes of continuous current output is classified as a? charger. (Ans- Level 1 An AC charger with a single-phase 208-volt or 240-volt connection and a continuous current output of up to 80 amperes is classified as a? charger. (Ans- Level 2 The purpose of the J1772 connector pins is to provide?. Select one: a.a charging interface that is safe for consumers to use
d.All of the above (Ans- Connector configuration True or false: The EV's power acceptance rate should not be considered when making EVSE purchasing decisions. (Ans- False The State of Charge of the EV battery is?. (Ans- a determining factor in calculating the time necessary to fully charge an EV Which of the following is the Japanese DC quick charging standard? Select one: a.CHAdeMO b.JARI c.SAE d.TEPCO (Ans- CHAdeMO The CHAdeMO V1.0 Standard has charging power up to? at? , up to?. (Ans- 62.5 kW / 500 VDC / 125 A
Wireless EV charging utilizes the principles of?. (Ans- INDUCTION Which of the following is connected to the charge controller of a wireless EV charger via hardwiring? Select one: a.Power capture resonator b.Power control unit c.Power multiplier coil d.Power source coil (Ans- Power source coil What are the advantages of wireless charging? Select one: a.Compatibility standards are still under development b.It has no exposed electrical contact points c.Wireless charging has better aesthetic quality d.Both b. and c. (Ans- both B and C True of False: Wireless charging is more expensive than coupled EVSE. (Ans- True
EV networks utilize memberships that are?. (Ans- fee-based or pay-as-you-go EV networks generate revenue with which of the following? (Ans- All of the above The National Electrical Code (NEC)? (Ans- provides minimum installation requirements Installations covered by the NEC include which of the following? Select one: a.Industrial substations b.Installations on public and private premises c.Recreational vehicles, floating buildings, and mobile homes d.All of the above (Ans- All of the above NEC Chapters 1-4 apply to?. (Ans- all installations except as modified by Chapters 5, 6, and 7
NEC Chapter 8 covers? systems and? subject to Chapters 1-7 unless specifically referenced. (Ans- communications / is not Chapter 9 of the NEC contains which of the following? Select one: a.Auxiliary information that is not enforceable b.Engineering tables that are only intended to be used by electrical designers c.Load calculation examples d.Tables that are applicable and enforceable when referenced elsewhere in the Code (Ans- Tables that are applicable and enforceable when referenced elsewhere in the Code Definitions that are specific to a particular article are located in which of the following sections? Select one: a.xxx. b.xxx. c.xxx. d.xxx.12 (Ans- xxx.
Which of the following calculations are covered in Article 220? (Ans- Residential, commercial, industrial service, and feeder The tables in Article 310 identify?. Select one: a.allowable ampacity of conductors based on conductor size and material b.ampacity adjustment and correction factors c.wire types and application d.all of the above (Ans- D NEC 110.14(C) requires conductor ampacity to be?. (Ans- coordinated with equipment termination ratings According to Article 625, EVSE is equipment that has the specific purpose of transferring energy from? to the electric vehicle. (Ans- the premises wiring system Overcurrent protection for EVSE is covered in?. (Ans- Section 625.
EVSE output cable is permitted to be made from Type? cable and is generally permitted to have a maximum length of?. (Ans- EVJT / 25' EVSE must be equipped with a(n)? that prevents the charging connector from being accidentally energized before it is connected to the vehicle. (Ans- interlock EVSE equipment shall have means to? the charging cable if strain is placed upon it that could rupture the cable or connector, leading to exposure of live parts. (Ans- deenergize EVSE shall have a(n)? system for shock protection for personnel. (Ans- listed When an EV and EVSE is used to facilitate power supply as an interactive power production source, which article must be applied? (Ans- Article 705
What is the minimum branch circuit size for a Level II EVSE with a 32- ampere current rating? (Ans- 40 A 32 A * 1.25 = 40 A minimum OCPD What is the minimum size XHHW-2 copper conductor permitted to supply a Level II EVSE that has a 30-ampere current rating, assuming 75° terminations? (Ans- 8 AWG 30 A * 1.25 = 37.5 A = 8 AWG True or False When calculating the voltage drop on a conductor of a given length, the following values must be considered: conductor material, conductor length, and conductor operating temperature. (Ans- True Note: While insulation type will not directly affect the conductor voltage drop, the insulation must be rated for the operating temperature of the conductor. Per NEC 2017 Chapter 9, Table 8, conductor properties are based at 75°C. Any temperature aside from that will require compensation of the DC resistance per Note 2. Calculate the voltage drop on a single-phase circuit with 32 amperes of load, a distance of 320 feet from the load to the panelboard, and served by 8 AWG copper THHN conductors. (Ans- 16 V
2KIL / A = VD
(2) × 12.9 × 32A × 320' / 16,510 cmil = 16 V Calculate the following correct copper conductor size so that the branch circuit has a maximum voltage drop of 2%. The load on the circuit is 32 amperes, the distance from the load to the panelboard is 400 feet, and the circuit is 208 volts, single-phase. (Ans- 1 AWG 2% × 208 V = 4.16 V 2 KIL / VD = A 2 × 12.9 × 32 A × 400' / 4.16 V = 79,384.6 cmil = 1 AWG Three single-phase Level II EVSE are distributed equally on a 3-phase, 4- wire system and each EVSE draws 24 amperes. What is the line current on each phase? (Note: Use 1.732 for the square root of 3.) (Ans- 41. A 24 A × 1.732 = 41.56 A per phase Two Level II EVSE circuits are installed in the same PVC conduit. Each EVSE is served by a 40-ampere circuit at 240 volts with an EGC run along
Continuous factors are not needed as actual lighting load is all that is requested. Correction factors will apply when sizing the branch circuit OCPD and conductors, which is beyond the question scope. A 32,000 square foot office building has 120 20-ampere, 120-volt duplex receptacle outlets. What is the branch circuit receptacle load? (Ans- 28,000 VA Note: 220.14(K) - use largest of either 1 VA per square foot or 180 VA per outlet .180 VA × 120 = 21,600 VA 32,000 ft2 × 1 VA = 32,000 VA An existing 400-ampere, 120/208-volt, 3-phase, 4-wire service has 30 kilovolt-amperes of non-continuous load and 58 kilovolt-amperes of continuous load. How much more continuous load can be added to the service? (Note: Use 1.732 for the square root of 3.) (Ans- 33,281.92 VA Note: 30 kVA + (58 kVA × 1.25) = 102.5 kVA 400 A × 208 V × 1.732 = 144,102.4 VA
Remaining VA available prior to continuous load correction = 41,602. VA 41,602 VA × 0.8 = 33,281.92 VA An office building has 22 kilovolt-amperes of lighting that is at continuous operation. It also has 35 20-ampere, 120-volt duplex receptacles. Both loads are fed from a 300-ampere panelboard operating at 120/240 volts, single phase. How much more continuous load can be added to the service? (Ans- 30,560 VA 22 kVA × 1.25) + (35 × 180 VA) = 33,800 VA 300 A × 240 V = 72,000 VA 72,000 - 33,800 VA = 38,200 VA 38,200 VA × 0.8 = 30,560 VA is the capacity left on the continuous load The correct answer is: 30,560 VA A Level II EVSE with a rating of 32 amperes at 208 volts is installed. What is the minimum size copper equipment grounding conductor required to serve the installation? (Ans- 10 AWG
