WorksheetsNCCER Electrical 3 Module 2
Total questions: 15
Worksheet time: 8mins
A correction factor must be applied if the ambient temperature is above _____.
24°C
26°C
28°C
30°C
An acceptable method of identifying grounded conductors larger than No. 6 AWG is by
tagging them or marking them _____.
Black
Green
White
Blue
The color reserved for identifying the high leg of a three-phase, four-wire delta system is
_____.
Orange
Green
White
Grey
The physical properties of a No. 4/0 copper conductor would be found in _____.
NEC Tables 310.15(B)(1) and (2)
NEC Table 310.16
NEC Chapter 9, Table 1
NEC Chapter 9, Table 8
Correction factors for reductions due to high ambient temperatures are found in _____.
NEC Tables 310.15(B)(1) and (2)
NEC Table 310.16
NEC Chapter 9, Table 1
NEC Chapter 9, Table 8
If a conductor has a diameter of 80 mils, its diameter in inches is _____.
0.02"
0.04"
0.06"
0.08"
The square mil area of a conductor that is 0.250" on all sides is _____.
55,000 mils^2
62,500 mils^2
75,600 mils^2
80,200 mils^2
What is the total resistance of a two-wire circuit that spans a distance of 100' each way if the
resistance per 1,000' is 1.24 ohms?
0.112 ohm
0.248 ohm
0.312 ohm
0.480 ohm
To keep the voltage drop of a 277V circuit to a maximum of 3%, what would be the
MAXIMUM allowable voltage drop?
5.3V
8.3V
9.2V
10.4V
Which of the following MUST be considered when determining the size of the conductor
required to connect an electrical load to the source of supply?
Permissible voltage drop
Number of strands
Frequency of load operation
Type of conductor insulation
The circuit between the final overcurrent device and the outlet is known as a ___.
feeder
branch circuit
runner
subfeeder
The insulation thickness of a 2/0 THHN conductor is __.
20 mils
30 mils
40 mils
50 mils
Among the following, the smallest wire size is ___.
No. 40
No. 18
1/0
3/0
The total resistance of a 120V, two-wire circuit consisting of two No. 12 AWG solid copper conductors each 100' (30 m) long is ___.
0.386Ω
1.93Ω
2.47Ω
3.86Ω
If a 120V, two-wire circuit using No. 8 AWG wire feeds a total load of 40A with a branch circuit length of 100', the voltage drop is ___.
1.75V
3.65V
4.72V
6.25V
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