Worksheetsamperes
Total questions: 8
Worksheet time: 4mins
The maximum setting of the ground-fault protection shall be ___ and the maximum time delay shall be one second for ground-fault currents equal to or greater than ____.
1200 A, 3000 A
1000 A, 2000 A
600 A, 300 A
300 A, 1000 A
The ampacity of an 8.0 mm2 TW copper conductor when there are not more than three (3) conductors in the raceway and the ambient temperature is 38 ˚C would be.
33 A
20 A
50 A
36 A
What is the current-carrying capacity of each of the three copper bus-bars? The cross-sectional area of each is 1.25 cm x 2.75 cm, if each bus bar were replaced by aluminum, what is the corresponding current-carrying
550 A, 370 A
155 A. 109 A
533 A, 375 A
375 A, 533 A
Where connected to a 20-ampere branch circuit supplying two or more receptacle or outlets, what should be the maximum allowable rating of a cord-and-plug connected load?
16 amp
20 amp
30 amp
24 amp
What is the current carrying capacity of each conductor if 28-14 sq. mm THW copper conductors are installed in an auxiliary gutter?
32 A
28 A
18 A
36 A
A cable that contains four single-phase control circuit of two 5.5 sq. mm THHN with 1 neutral and 1 grounding conductor each is to extend from a point on the feeder that at times reaches an ambient temperature of 40 degree Celsius. What is the absolute allowable ampacity for the conductor?
28 A
15.4 A
17.5 A
30.8 A
Find the minimum size of overloads required to protect a 3-phase 10 hp 230 volts Induction type squirrel induction motor with a service factor of 115%
28 A
70 A
35 A
22.4 A
A 15 hp 480 V 3-phase motor bears the code letter D and specifies a temperature rise of 40 °C. Determine the locked-rotor current required.
13.46 A
23.31 A
81 A
16.83 A
