EVCS-23 Questions and answers

EVCS-23 Questions and answers Natural gas vehicles can increase their range by using liquified natural gas instead of compressed natural gas. True The battery chemistry typically used in EVs is ?. li-Ion What makes dependence on fossil fuels a national security concern for the United States? The heavy reliance on imports from foreign nations to meet demand. A battery is at 50% SOC, what C-rate is necessary to fully charge it in 30 minutes? 1C What unit of time is used for the basic C-rate determination? Hour Passenger vehicles in a fleet can efficiently be recharged with how much charger power? 250 kW According to Ohm's Law, if voltage increases ? a. current may have increased b. resistance may have increased c. both resistance and current d. All of the above What does C-rate describe? a. A rate of charge. b. A rate of discharge. c. Neither A or B. d. Both A and B. Both A and B What is a typical difference between an HEV and a PHEV? A PHEV can travel on just an electric motor. Which type of vehicle does not need traditional fuel? BEV What is the primary benefit provided by wireless EV charging systems? Convenience of no cables or plugs How does the proximity detection pin promote safety on a J1772 charge coupler? Fully verifying insertion before allowing to charge What is the purpose of Pin L1 on the J1772 male charging connector? The J1772 Pin L1 is the AC phase 1 line delivery. What is the maximum AC amp draw of a 50 kW DC fast charger on a 480V AC service? 100A What communication method does a J1772 combo charger use to send control pilot signals related to safety functions? Pulse Width Modulation (PWM) What is the maximum rated current for CCS Combo 1 connectors? 500A What type of electrical outlet can typically be used to plug in an AC level 1 electric charger for home charging? A standard 120V household outlet The state of charge (SOC) affects the charge duration. True Which standard does NOT apply to wireless EV charging equipment installation? J1772 What communication method resists external noise interference? Differential signaling EVSE demand factors are applied to feeder/service loads. False Can an electrician waive or alter NEC code rules that are explicitly stated as "applicable," if the electrician is highly skilled? No What Chapter 3 violation results from improper use of NM cable for EVSE? Unapproved wiring methods Overcurrent devices must be ? Coordinated When can neutral demand factors be applied to EVSE circuits? a. Neutral demand factors are applied to EVSE circuits for specified unbalanced loads over 200 A. b. Neutral demand factors are applied to EVSE circuits for all installations under 200 A. c. Neutral demand factors are applied to EVSE circuits for continuous loads. d. Neutral demand factors are applied to EVSE circuits optionally for any circuit. a. Neutral demand factors are applied to EVSE circuits for specified unbalanced loads over 200 A. What indicates an NEC rule is supplemented by another article? a. Supplemented by b. An asterisk c. A forward reference d. Bold text a. Supplemented by Raceways should be arranged ? c. To drain condensation What does the NEC require in Section 110.14 for connecting conductors to terminals? a. Any type of connector is permitted for terminal regardless of secure fit. b. A mechanically secure electrical connection without damage to the conductors is required, including the appropriate pressure connectors, lugs, or splices used. c. Hardwiring directly to the EVSE terminals is a requirement. d. Only non-pressure style connectors are permitted. b. A mechanically secure electrical connection without damage to the conductors is required, including the appropriate pressure connectors, lugs, or splices used. What NEC article covers branch circuit, feeder, and service load calculations? a. 100 b. 220 c. 310 d. 405 b. 220 Installation requirements for parallel conductors include being identical in what? a. Length b. Material c. Insulation d. All of the above d. All of the above What is the continuous load factor that must be applied to EVSE equipment for branch-circuit sizing? a. 115% b. 125% c. 150% d. None of the above b. 125% A hotel is installing a new 30 A, 208 V 3-phase EVSE. Should it be considered a continuous or non-continuous load? a. Non-continuous because hotel guests vary. b. Continuous, because EV charging takes multiple hours. c. Continuous, because the EVSE uses 3-phase power. d. Non-continuous, since hotel occupancy changes. b. Continuous, because EV charging takes multiple hours. A single-family residence has 1,200 sq ft of living space, a 200 sq ft open porch, a 600 sq ft unfinished basement, and an 800 sq ft attached garage. Using the NEC 220.82 optional method, what is the total general load, excluding the small appliance and laundry load, for this home? a. 3,600 VA b. 6,000 VA c. 7,800 VA d. 8,400 VA a. 3,600 VA Determine the total largest calculated heating and cooling loads, using the NEC optional method 220.82: there are (2) 9 A, 240 V room air-conditioning units, and a 1.8 kW permanently installed bathroom space heater (assume PF = 1.0). a. 1.80 kVA b. 2.16 kVA c. 4.23 kVA d. 4.32 kVA d. 4.32 kVA What is the role of demand factors in load calculations? a. Adjust total connected loads to expected usage b. Account for future load growth c. Provide safety factors for peak demand d. Allow higher load density a. Adjust total connected loads to expected usage A residence is adding a new 40 A, 240 V EVSE. Will this EVSE likely be a continuous or non-continuous load? a. Non-continuous because home charging is intermittent b. Non-continuous because the EVSE uses 240 V c. Continuous, since EV charging takes hours d. Continuous, because the EVSE can be unplugged c. Continuous, since EV charging takes hours A single-family residence has 2,500 sq ft of living space, a 100 sq ft open porch, and an 800 sq ft attached garage. Using the NEC 220.82 optional method, what is the total general load for this home? (Be sure to include the minimum laundry circuit and small appliance branch circuits.) a. 10,000 VA b. 12,000 VA c. 12,300 VA d. 14,400 VA b. 12,000 VA You are installing a 40 A, 240 V EVSE in an existing single-family home (1,200 sq ft, 8 kW range, 2.5 kW water heater, 9 kW electric space heating in three rooms, 6 kW dryer, and 6 A 240 V A/C unit). Use NEC 220.83(A) to determine the additional EVSE load for a 125 A panel. a. 40 A b. 50 A c. 60 A d. 70 A b. 50 A A 60 A, 208 V three-phase EVSE is being installed in an office parking lot. Is this considered a continuous or non-continuous load? a. Non-continuous because employees may not use it daily b. Non-continuous, because the EVSE can be turned off c. Continuous, because the EVSE draws high amps d. Continuous, because EV charging can exceed 3 hours d. Continuous, because EV charging can exceed 3 hours The phrase "conditions of use" refers to ambient temperature and conduit heating resulting from ?. a. Inaccurate selection of conductors from Table 310.16 b. Neighboring conductor that has not been factored in NEC Table 310.16 c. Termination lug and conductor sizing d. None of the above b. Neighboring conductor that has not been factored in NEC Table 310.16 What functionality is enabled by a microgrid interconnect device (MID)? a. Grid isolation for backup power b. Bi-directional power flow c. Load shedding d. Voltage regulation a. Grid isolation for backup power Spacing and clearance requirements aim to make EV charging ? a. Affordable b. High speed c. Convenient d. Universally accessible d. Universally acces What is the best way to verify de-energization of a bi-directional EVSE? a. Check inverter display b. Test with multimeter c. Visual inspection d. Review wiring diagram b. Test with multimeter What may local utilities require for EVSE equipment? a. Decorative housings b. Special markings c. Premium components d. Load management settings d. Load management settings Conducting a thorough site evaluation helps identify and resolve which issues? a. Land use issues b. Permitting issues c. Drainage issues d. Accessibility issues d. Accessibility issues Minimum dimensions for EV charging spaces allow room for ? a. Any vehicle b. Wheelchair lifts c. Extra equipment d. Additional drivers b. Wheelchair lifts What should be done prior to installing EVSE equipment? a. Hire contractors b. Review service capacity with the utility c. Purchase EVSE units d. Begin construction b. Review service capacity with the utility Why might PPE be required more when servicing bi-directional EVSE? a. Lower voltage b. Higher voltage c. Higher ampacity d. Live energy sources d. Live energy sources It is safe to service a bi-directional EVSE without PPE after disconnecting the AC supply. False Why is technical knowledge required to properly apply an EMS? a. Complex wiring b. Interaction with other systems c. Frequent reprogramming d. Precise load calculations d. Precise load calculations What is the purpose of commissioning for EV charging stations? a. Validate manufacturing quality b. Confirm proper installation and activation c. Test new software features d. Verify end-of-life decommission b. Confirm proper installation and activation Which external component is vulnerable to physical damage or loosening? a. Outlet b. Cordset c. Controller d. Grounding system b. Cordset Where are standardized EVSE training programs available? a. Community colleges b. Manufacturer websites c. Industry associations d. Government agencies c. Industry associations What critical task is done before re-energizing equipment after repairs? a. EV simulation b. Safety procedures c. Diagnostic checks d. Data line verification b. Safety procedures What are some additional common points of failure in EVSE systems? a. Rectifiers, circuit boards, fans, and filters b. Wiring, breakers, connectors, and outlets c. Power wiring, transformers, curbing d. Enclosures, paneling, and lighting a. Rectifiers, circuit boards, fans, and filters What should be thoroughly consulted before any EVSE repair or replacement? a. Safety procedures b. Technical specifications c. Testing data d. Manufacturer documentation d. Manufacturer documentation EVSE manufacturers provide what to help systematically diagnose issues? a. Troubleshooting flow charts b. Training programs c. Repair guides d. Replacement components a. Troubleshooting flow charts What is essential for electricians to understand before using the flow chart? a. Repair procedures b. Safety protocols c. Manufacturer guidelines d. Diagnostic tools b. Safety protocols When does the factory acceptance testing take place? a. At the customer site b. During decommissioning c. At the factory before delivery d. After installation c. At the factory before delivery What tool simulates an EV connection for testing? a. Load bank b. Fluke FEV100 c. Amp probe d. Battery simulator b. Fluke FEV100 Which risk control method depends on human behavior and compliance? a. Engineering controls b. Administrative controls c. Elimination d. Substitution Administrative controls Barriers around live parts are an example of what control according to NFPA 70E? a. Administrative b. Engineering c. Elimination d. Substitution b. Engineering What could energize the EVSE branch circuit during work? a. Utility only b. PV system c. EV battery d. All of the above b. PV systems Testing meter operation before use reduces the risk of _____? a. Exceeding interrupting ratings b. Arc flash hazards c. Transient induced voltage d. Taking inaccurate voltage measurements d. Taking inaccurate voltage measurements What conditions require an energized electrical work permit? a. Any work on energized conductors b. Work within the limited approach boundary c. Tasks requiring arc flash PPE d. All of the above d. All of the above Where are PPE category tables found in NFPA 70E? a. Article 110 b. Article 120 c. Article 130 d. Annex D c. Article 130