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IEC Second Semester practice final
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IEC Second Semester practice final
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IEC SECOND SEMESTER PRACTICEFINAL COMPLETE SOLUTION 100%
VERIFIED ANSWERS GRADED A+
The maximum size ITCB permitted to be installed in the panel is ___ A. Refer to the information given in
Figure 230.225.
2020 NEC: 430.52(C)(1) Exc 1 | 2020 NEC: 430.250 (Table)Table FLA = 30.8 amps 2.5 X 30.8 = 77 80-A
breaker - 80
Using the information shown in Figure 230.225 and 430.52(C)(1) Exc 1 DETD, fuses with the maximum
permitted rating were installed in the disconnecting means for the motor. Given this information and
that the smallest permitted circuit conductors are used, the minimum size EGC permitted is ___ AWG.
Table FLA = 30.8 amps 1.75 X 30.8 = 53.9 60 A fuses 10 AWGversus 30.8 X 1.25 = 38.5 A 8 AWG at 75º
terminations EGC not req'd to be > 8 AWG2020 NEC: 250.122 | 2020 NEC: 430.52(C)(1) Exc 1 - 10
A 100-gallon water heater is to be installed to supply hot water to the restrooms in an office building.
The water heater is rated for 9.8 KW at 240 volts 1-phase. The circuit for the water heater originates in a
120/208-volt, 3Ø, 4-wire panelboard. The minimum size THHN/THWN copper wire that can be installed
between the required disconnect switch and the water heater is ___ AWG. Don't forget to check the
requirements of 240.4(D).
R = [Erated]2÷ Prated = (240)2÷ 9800 = 5.8775 & I208 = E ÷ R = 208 ÷ 5.8775 = 35.3935.39 X 1.25 = 44.24
or 44 amps 8 AWG2020 NEC: 422.13 | 2020 NEC: 422.10(A) - 8
A 208-volt, 3-phase, 50 hp, squirrel-cage motor has a full-load current of ___.
2020 NEC: 430.250 (Table) - 143
A free-standing cabinet is to be installed in a science classroom at a high school. The plans show a
receptacle that is to be installed face-up in the cabinet countertop. Does Section406.5(E) in the NEC®
prohibit this installation? - No
A handhole is not required for metal luminaire poles ___ feet or less above finish grade if the pole is
provided with a hinged base and the equipment grounding terminal is accessible within the base.
, 2020 NEC: 410.30(B)(1) Exc 2 - 20
A location in which flammable gases or vapors are present in the air in quantities sufficient to produce
explosive or ignitable mixtures is classified as a ___ location.
2020 NEC: 500.5(B) - Class 1
A surface-mounted fluorescent luminaire (light fixture) mounted in a clothes closet must maintain a
clearance of at least ___ inches to the storage area.
2020 NEC: 410.16(C)(2) - 6
Article ___ in the NEC® provides requirements for generators. - 445
Article ___ in the NEC® provides requirements for the installation of refrigeration equipment. - 440
Branch-circuit conductors supplying more than one motor shall have an ampacity of at least ___ percent
of the FLC of the largest motor, plus 100% of the FLC of the other motor(s) in the group.
2020 NEC: 430.24 - 125
Control voltage for permanent amusement attractions shall be a maximum of _______ volts, nominal, ac
to ground.
2020 NEC: 522.5 - 150
Each fitting attached to a heavy-duty lighting track shall ___.
2020 NEC: 410.153 - have individual overcurrent protection
Each motion picture projector, floodlight, spotlight, or similar equipment shall have clear working space
not less than ___ inches wide on each side and at the rear thereof.
2020 NEC: 540.12 - 30
Emergency system equipment shall be designed and located so as to minimize the hazards that might
cause complete failure due to flooding, fires, and ___.
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