Electric Veh Charg Sys - 2017 NEC - 2nd Ed.

Which of the following drive the market for EVs?

a. Cheaper gasoline prices

b. Decreased cost of electric vehicles

c. Increased interest in alternatives to gas-powered vehicles

d. Both b. and c.

D.

A partial zero emissions vehicle (PZEV) is defined as which of the following?

a.A gas-engine vehicle that has zero evaporative emissions from its fuel system

b.A plug-in electric vehicle

c.A vehicle with a hybrid gas-electric drive train

d.An electric vehicle that only has provisions for wireless charging

A

True or False:

The state of charge is the available capacity of the battery, expressed as a percentage.

True

Which of the following describes an advantage that hybrid electric vehicles have over traditional gas-powered vehicles?

a.Hybrid vehicles are more expensive than gas-powered vehicles.

b.Hybrid vehicles have superior efficiency compared to gas-powered vehicles.

c.Both a. and b.

d.None of the above

B

Which of the following is not an alternative to fossil fuels?

a.Compressed air

b.Electricity

c.Fuel cell

d.Gasoline

Gasoline

The EV industry is comprised of ? .

a.auto manufacturers

b.consumer advocacy groups

c.EV charging equipment manufacturers

d.research and standards organizations

e.all of the above

E

The first electric vehicle can be traced back to ? .

1832

Which of the following illustrates why electric vehicles were so popular in the early days of automobiles?

a.They were clean to operate.

b.They were mechanically complicated.

c.They were quiet.

d.Both a. and c.

D

What factors limited the popularity of EVs as internal combustion engine vehicles came to the market in the early 1900s?

Charge Times

Range

Speed

What was the first mass-produced hybrid electric vehicle?

Toyota Prius

What improvements in technology have increased interest in EVs?

Improved range, power and lighter batteries

What best describes early EVs?

Quiet, easy to start, and mechanically simple

Which of the following is not a category of electric vehicles?

a.BEV

b.HEV

c.ICE

d.PHEV

ICE

What category of EV has been available to consumers the longest?

a.BEV

b.HEV

c.PHEV

d.All of the above

HEV

Which of the following describes a plug-in electric vehicle that runs on batteries until nearly depleted, then switches over to an ICE generator to extend the battery range?

a.BEV

b.PHEV

c.All electric vehicles have this capability.

d.No electric vehicle currently on the market has this capabilit

PHEV

True or False

A battery electric vehicle requires external charging but does not rely on an internal combustion generator for extended range.

True

EVs can be equipped with a(n) (?) motor.

a.induction

b.internal combustion

c.permanent magnet

d.either a. or c.

D.

Regenerative braking is best described as

An Energy recovery system

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

Parallel hybrid drive

What types of commercial/industrial vehicles are currently available in an electrified version?

Cargo and material-hanling equipment

Delivery vans and buses

Semi-trailer trucks

Forklifts, yard tractors, and drayage trucks are all examples of ? .

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

All of the above

Fleet vehicle battery capacity has reached upward of ? for heavy duty vehicles.

550 kWh

Quiz #2

Quiz # 2`\

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

Supplying power (kW) to an EV battery

Which of the following acronyms represents the level of charge present in an EV battery?

a.ANSI

b.EVA

c.NFPA

d.SOC

SOC

True or False:

The first EV chargers were external and supplied DC current directly to the vehicle's batteries.

True

Which of the following was an early electric vehicle charger?

a.City of Seattle's Electro-Park electrified parking space

b.Ford Dyna-Charge

c.General Electric arc rectifier

d.Tesla Model 001 Charger

General Electric arc rectifier

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.

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.

Both B and C

True or False: EVSE provides DC power to the electric vehicle charging port.

False

DC charging equipment provides DC directly to ? in an EV.

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

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.

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.

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

b.a means to signal the EVSE to stop charging based on the pin contact state

c.signals to the EVSE that the connector is properly seated on the vehicle

d.all of the above

all of the above

Which of the following is true about the J1772 standard control pilot terminal pin's function?

Select one:

a.It changes the state of the EVSE according to the voltage present.

b.It defines the state of the EVSE.

c.It uses a +12V to -12V AC square wave signal.

d.All of the above

all of the above

Which of the following is not a variable that determines the charging time of an EV?

Select one:

a.Connector configuration

b.Max power capacity of the EVSE's converter

c.Size of the electrical feeder/service supplying the EVSE

d.All of the above

Connector configuration

True or false: The EV's power acceptance rate should not be considered when making EVSE purchasing decisions.

False

The State of Charge of the EV battery is ? .

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

CHAdeMO

The CHAdeMO V1.0 Standard has charging power up to ? at ? , up to ? .

62.5 kW / 500 VDC / 125 A

Wireless EV charging utilizes the principles of ? .

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

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.

both B and C

True of False: Wireless charging is more expensive than coupled EVSE.

True

What is the SAE standard for wireless charging?

J2954 recommended practice

The SAE standard for wireless charging has specifications that include which of the following?

Select one:

a.Magnetic triangulation for vehicle alignment over the power source coil

b.Means to allow for payment without physical interaction

c.Up to 11 kW charging capacity

d.All of the above

All of the above

Which of the following is not true of EV charging networks?

Select one:

a.Charging networks offer both paid memberships and free memberships with pay-as-you-go charging.

b.There are over a dozen networks across the U.S. and Canada.

c.They allow businesses a way to draw consumers to charging equipment and generate revenue via transaction processing.

d.None of the above

None of the above

EV networks utilize memberships that are ? .

fee-based or pay-as-you-go

EV networks generate revenue with which of the following?

All of the above

Quiz 3

Quiz 3

The National Electrical Code (NEC) ?

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

All of the above

NEC Chapters 1-4 apply to ? .

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.

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

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.1

b.xxx.2

c.xxx.10

d.xxx.12

xxx.2

Article 110 covers ? requirements for wiring and equipment.

general

True or False: The maximum amount of current a conductor can carry under the conditions of use without exceeding its temperature rating is found using the calculation methods based in Article 310.

True

Temperature ratings of equipment, overcurrent devices, and conductors must be ? and ? to not exceed the lowest rated element of the circuit.

selected / coordinated

Requirements for branch circuits and AFCI/GFCI protection of branch circuits are found in ? .

Article 210

The ? load for listed occupancies is based on Table 220.12.

lighting

Which of the following calculations are covered in Article 220?

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

D

NEC 110.14(C) requires conductor ampacity to be ? .

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.

the premises wiring system

Overcurrent protection for EVSE is covered in ? .

Section 625.41

EVSE output cable is permitted to be made from Type ? cable and is generally permitted to have a maximum length of ? .

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.

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.

deenergize

EVSE shall have a(n) ? system for shock protection for personnel.

listed

When an EV and EVSE is used to facilitate power supply as an interactive power production source, which article must be applied?

Article 705

When an EV and its EVSE is used as a power supply for an optional standby system, requirements found in ? are applied.

702

True or False

The NECA 413-2012 Standard is the only ANSI-approved standard for EVSE installation and maintenance.

True

NECA 413-2012 contains ? requirements for EVSE installation, covering everything from planning an installation to ADA considerations and commissioning process.

performance-based

Level 2 EVSEs with a rating of 6.6 kilowatts can supply ? of charge current when operating at 220 VAC.

30 A

I = P/E

Quiz 4

Quiz 4

What is the minimum branch circuit size for a Level II EVSE with a 32-ampere current rating?

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?

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.

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.

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.

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.)

41.56 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 with the circuits. What size copper EGC is required for this installation?

10 AWG

T250.122 - 40 A Circuit = 10 AWG CU equipment ground

Nine Level II EVSEs are installed on a 3-phase, 4-wire 120/208-volt system. Each EVSE is 208/240 volts, single-phase and rated at 24 amperes. What is the minimum ampacity of the copper feeder conductors required to serve the installation?

156 A

Note: 24 A × 1.25 = 30 A required for each EVSE

3 units on each phase = 30 A × 3 = 90 A

Line current needed to find feeder size: 90 A × 1.732 = 156 A per line needed

156 A = 2/0 Copper

What is the general lighting load of a store with an area of 12,000 square feet?

36,000 VA

Note: 12,000 ft2× 3 VA per ft2 = 36,000 VA per Table 220.12

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?

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.)

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 = 41,602.4 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?

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?

10 AWG

Note: Section 250.122 - the EVSE will be served by a 40A OCPD; therefore, the minimum size equipment ground will be 10 AWG.

Additional EVSEs are to be added to an existing 120/208-volt, 3-phase, 4-wire, 600-ampere service with 220 amperes of non-continuous load and 172 amperes of continuous load. The EVSEs each draw 32 amperes. How many new EVSEs can be added to the service? (Note: Use 1.732 for the square root of 3.)

6

look at the quiz

What is the minimum copper THHN feeder size for 12 EVSEs rated at 24 amperes on a 3-phase, 4-wire, 120/208-volt system, assuming four EVSE per phase? (Note: Use 1.732 for the square root of 3.)

4/0 AWG

24 A × 1.25 = 30 A

There will be four per phase.

30 A × 4 = 120 A per phase

Line current is 120 A × 1.732 = 208 A feeder = 4/0 Copper

Conductor insulation does not have an effect on voltage drop.

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.

What is the maximum voltage drop recommended for branch circuits and feeders/electrical systems in the National Electrical Code (NEC)?

3% branch / 5% feeder/system

Note: Informational Note to NEC 210.19 - 3% for branch circuits / 5% for the overall system.

Quiz 5

Quiz 5

Conducting an onsite visit when assessing a location for an electric vehicle supply equipment installation is important because

it allows the electrical contractor to understand the prospective customers needs for an EVSE installation AND it provides an opportunity for electrical contractor to gather facts and present themselves as a knowledgeable professional.

Information gathered during a site visit should include...

A. Details about the existing electrical visit.B. Details on the desired EVSE location.C. Notes on how the customer intends to use the EVSE installation.D. All of the above **

A successful meeting with a prospective customer requires the contractor or contractor's representative to _____

demonstrate that they are qualified and have the needed expertise to handle the project, listen to the customer and ask questions, and look professional.

Incentives available for EVSE installation include which of the following?

A. Rate breaks or other incentives from serving utility.B. state or federal tax creditsC. tax incentives from the city of municipality.D. All of the above**