ESAMTAC
97. The restricted approach boundary (RAB) for the DC exposure at 480 volts is ___
1'
46. A DC ESS with a max steady state current of 100 amperes and 50 foot one way length of wire with a resistance of 0.00224 ohms per Kft has a voltage drop of ___.
11.2 V
38. Four 6 volt lead acid batteries are connected in series. They are rated at 2,000 mA. What is the current of the battery string.
2,000 mA
44. Conductors are sized according to ___.
310.15
16. What is the maximum power in watts this system could steadily provide for 20 hours and how many amps would each cell be delivering.
5,778 W, 10.7 A
19. Calculate the terminal voltage and time required to discharge the system for C/6 and C/20 respectively.
540 V, 6 hrs, 20 hrs
93. Exposure to current above ___ can be life threatening.
9 mA
66. Considering the installation of ESS, which of the following takes precedence?
A locally adopted electrical codes and standards (NFPA 70E)
92. At what voltage level is arc flash PPE required?
Above 50 V
29. Which of the following should be considered when determining a method of procedure for the installation of batteries in a rack?
All of the above
55. Which of the following is true?
All of the above
91. Which of the following is not determined by a shock risk assessment performed for an energized electrical work permit?
Amperage
65. DC arc flash calculation formulas can be found in NFPA 70E Annex ___?
Annex D
81. The formula for performing a DC incident energy analysis can be found in which NFPA 70 informative annex?
Annex D
82. Which of the following is not listed as category 1 PPE for arc flash and shock risk?
B Balaclava
86. ___ is a field expedient neutralizing agent.
Baking soda
18. Which type of inverter produces AC power, regulates PV array battery charging, sends excess power to the grid, and stands alone during grid outages?
Bi-modal inverters
9. Which of the following show promise for battery energy storage systems within microgrids?
Both lead acid and lithium ion, based on their applications.
51. The shielding with the broadest frequency rejection range is ___.
Braid shield
67. In the event of an emergency relating to an ESS, who oversees the response?
Building occupants
13. Which of the following is not a component of a battery cell?
Carrying handles or straps
24. When the door to a battery enclosure is opened, what is the most important thing to do first?
Check to make certain control power is off
39. When finely stranded cable has 19 strands of cable in sizes 18AWG to 2 AWG, 37 strands of cable in sizes 1 AWG to 4/0 AWG, AND 61 STRANDS OF CABLE IN SIZES 250 KCMILS TO 500 KCMILS?
Class C
100. How can the BSCC values be determined for a battery energy storage systems?
Contact manufacturer
61. What are the functions of BMS systems?
D All of the above
90. NEC Article 320 states that tools and equipment shall be ___.
D All of the above
10. Aging of the battery is dependent on ___.
D all of the above
11. Which of the following are alternative types of energy storage.
D all of the above
22. IEE 1187-2013 states that if the manufacturer has not provided sufficient information one should ___.
D all of the above
25. Which of the following should the inspection of batteries and the location of installation address?
D all of the above
28. Seismic racks for batteries are required by ___.
D all of the above
30. Spill containment is dictated by the ___?
D all of the above
32. A good way to avoid short circuits when installing batteries is to ___.
D all of the above
45. Voltage drop in DC systems is a ___ issue.
D all of the above
5. Combined heat and power systems ___.
D all of the above
54. A conductive body extending the ground connection can be a ___ conductor.
D all of the above
6. Which of the following is driving the expected trajectory of the microgrid market?
D all of the above
70. Electrolyte danger associated with lead acid batteries is primarily caused by spills. These can occur when a ___?
D all of the above
71. Which of the following is an electrical hazard associated with battery energy storage systems?
D all of the above
72. Excessive charge and discharge rates to Li-ion batteries may cause ___?
D all of the above
76.Lithium chemistry is susceptible to thermal runaway from over ___?
D all of the above
77. When working on lead acid batteries or around battery acids, which of the following is required PPE?
D all of the above
80. Which of the following PPE should be used when placing wet cell batteries in racks?
D all of the above
87. When performing a job hazard analysis, one should ___.
D all of the above
88. NEC Article 320 states that a battery risk assessment shall be performed to identify ___.
D all of the above
96. Article 130 Work involving Electrical Hazards permits exemptions to work permits for qualified persons, ___
D all of the above
98. In addition to the information listed on tables provided for industry codes and standards and manufacturer recommendations, hazard identification such as ___ is important in identifying arc flash and arc fault risk.
D all of the above
36. When making battery connections ___ could be the result of over torque.
D all of the above.
43. Connectors are sized for ___?
D all of the above.
4. Which of the following is not an output variable of a combined heat and power (CHP) electrical microturbine?
Exhaust temperature.
50. In ESM systems, fiber optics are often used to ___?
Extend communication distance
14. DC is more difficult to interrupt at high voltages and currents than AC.
False
15. As PV modules are wires in series and parallel, voltage and current decrease.
False
34. Manufacturer approved lubricant should be used to aid in sliding batteries along racks.
False
35. If a battery is difficult to maneuver it is acceptable to use its posts to increase leverage.
False
42. As batteries are connected in series the voltage does not accumulate but remains as that of the individual cells; therefore, the initial PPE category selected does not need to be increased.
False
47. Thermal protection in a circuit breaker protects against short circuits and faults, which are drastically larger than an overload.
False
57. A grounding electrode conductor (GEC) for a DC system cannot be spliced or jointed.
False
78. Under normal circumstances, lithium batteries have no associated chemical risks.
False
83. Adding a CB to a battery energy storage system is justified energized work
False
95. Non insulated (standard) tools can be used on segmented battery arrays.
False
99. According to article 130.2(A), work less than 50 volts indicates capacity of source and OCPD must be considered for exposure to burns and arc flash.
False
37. Which type of connector is used in battery systems that exhibit thermal contraction and expansion, have the need for frequent battery replacement, and exhibit limited work space?
Flexible Cable
63. Identify the overcurrent protection devices from the following options.
Fuse
21. In an ESS, the maximum current shall be the continuous inverter input current rating when the inverter is producing rated power at the ___ input voltage.
Highest
40. What type of connector is typically used to terminate flexible cable.
LT adaptor
74. Thermal runaway is a common concern for ___.
Lithium
53. A 3 wire DC system is grounded by means of the ___ conductor.
Neutral
26. When is it safe to open or enter ESS equipment?
Once the lockout/tagout procedure is performed.
62. Under what circumstances can a BMS issue a "battery cannot accept charge" signal to the inverter?
Pack discharge current limit
41. ___ is the best material for resisting corrosion; therefore, it is used in most hardware applications.
Stainless steel
7. Which of the following will an inverter not do?
Store electricity
73. Which of the following poses a chemical risk when dealing with lead acid batteries?
Sulfuric acid
1. Microgrids can help enable renewable energy by managing intermittency.
True
2. Distributive generation reciprocating engines used for combined heat power generation have a greater electrical output range than gas turbine engines.
True
23. In a ESS, once the electrical risks and voltage potentials have been brought to the minimal levels, the grounding and bonding connections can be removed prior to the removal and shipment of the container.
True
31. Polarity and chemical hazards must be considered when racking batteries.
True
33. Batteries are very heavy and may require a lift tale or several workers when racking them.
True
56. A two wire dc system is permitted to be ungrounded if it meets code requirements.
True
59. Managing charge and discharge is accomplished by a BMS through monitoring key variables and activating input signals based on them.
True
64. Cables used in ESS systems installed in buildings must comply with NEC classifications.
True
68. Overvoltage in li ion batteries may cause electrolyte decomposition leading to thermal runaway.
True
69. Li-ion batteries may create thermal injury hazards caused by overheating.
True
79. One should never work on installing lead acid batteries unless an eye wash station or kit is in proximity.
True
8. Lead acid batteries with thicker plates and larger acid volume can furnish higher capacity.
True
84. A balaclava is required when wearing a switching hood.
True
85. For spills greater than 5 liters the electrolyte should be neutralized where it occurred as soon as possible with a spill kit
True
89. NFPA 70E provides the prescriptive components to meet OSHA performance based requirements.
True
58. A ungrounded DC system requires ___.
an equipment grounding conductor
27. ___ is/are required by OSHA 29 CFR 1910.151(c) if any person is exposed to injurious corrosive materials.
an eyewash or shower
48. Finely stranded cables are terminated with ___.
compression lugs
60. What is the full form of CAN bus?
controller area network bus
75. Hydrogen is most likely present during ___.
float charge
3. In an AC coupled system, ___.
if the utility goes offline, harvested solar energy first flows to critical AC loads via the inverter and then to the battery bank.
94. According to article 130.2(A)(1) work involving electrical hazards, additional hazards or increased risks include ___.
interruption of life support equipment
62. Under what circumstances can a BMS issue a " battery cannot accept charge" signal to the inverter?
pack discharge current limit
52. A battery management systems primary purpose is to ___.
protect the batteries from operating out of specifications.
49. As batteries are connected in series, which of the following occurs?
voltage increases