PROBLEM #5 COMPREHENSIVE QUESTIONS 1. Which class of transmission line voltages

Question

PROBLEM #5 COMPREHENSIVE QUESTIONS 1. Which class of transmission line voltages does 138 kV falls in? 2. Which substation steps the voltage down from 4 kV to 34.5 kV? 3·The National Electrical Code requires that the "hot" (or feeder line) that carries curren to load be supply be The ground wire be green safety or common ground. Fill in the blank with the correct answer. , and the line called neutral) that carries current back to the and will be used for 4. Which of the components will not work between the two outside wires (240 V) of a three-wire (120/240 V) system. Circle the correct answer. i) electric range ) lighting ii) thermostat iv) air conditioner 5. What are the three advantages of using transformers?

Explanation / Answer

a)138kV is high voltage line.

b)Distribution Substation steps the voltage form 34.5 to 4kv.

c)hot needs to be blue (for phase 3 and red for phase 2)

neutral needs to be white

and ground needs to be green.

d)air conditioner.

e)Transformers “step down” supply line voltage to distribution level voltage.

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