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- Count the neutral conductor of a 4-wire, 3-phase, wye-connected circuit when the major portion of the load is electric discharge lighting (fluorescent, mercury vapor, high-pressure sodium, etc.), data processing, and other loads where the neutral conductor carries a. grounding b. traveler C. d. current. third harmonic unbalanced conductors to overheat but often overlooked is the possibility of2. What is the difference between single-phase controlled and three-phase controlled circuits?all elements in a circuit that carry the same current are said to be ______ a. closed-loop b. network c. series d. bilateral
- Explain the importance of power system protection. Discuss various types of protection devices and strategies used to safeguard electrical infrastructure from faults and disturbances.7.B. The size of a grounding electrode conductor for a service or separately derived system is generally basedon the size of the largestA. ungrounded supply conductor.B. equipment grounding conductor.C. grounded electrode.D. bonding jumper.7.C. Which of the following statements about bonding is true?A. The joint or termination must offer opposition in the circuit for effective electrical connections.B. Effective bonding keeps impedance high if a fault should occur.C. The entire electrical safety circuit is only as good as its strongest bonded link.D. Bonding connections must endure high levels of fault current until overcurrent protective devices can operate.How can you calculate the maximum short-circuit current that can pass when the A-B ends of an outlet in your home are short-circuited? What kind of measurements can be made for these calculations? Please explain.
- If the critical commutation time is 2 ms but it was observed that the practical commutation took 2.5 ms. This is the case of __________a) under commutationb) over commutationc) critical commutationd) none of the mentionedQuéstion 9 Line to line to line fault is an asymmetrical type of fault in power system which occurs very frequently True Falsec.1. Which of the following is one of the three essential functions of an equipment grounding conductor?A. Provide an arc-fault current pathB. Establish groundingC. Establish bondingD. Ensure the system is groundedc.2. What's another name for the three-point method of Earth resistance testing?A. Fall-of-potentialB. Line surgeC. Spatial shieldingD. Leakage current c.3. If the National Electrical Code provides a requirement to ground equipment, it generally implies thatthere will be a direct connection to the Earth of a connection through a/anA. grounding electrode conductor.B. equipment grounding conductor.C. equipotential bonding conductor.D. bonding conductor.
- Explain the concept of symmetrical and unsymmetrical faults in power systems. How are these faults analyzed, and what protective measures can be implemented?h.1. In an alternating-current system, the maximum size for a copper grounding electrode conductor isA. 250 kcmil.B. 3/0.C. 500 kcmil.D. 4/0. h.2. The figure shows a fault condition in an ungrounded electrical system. Which of the following will occurbecause of the fault in this system?A. Only the overcurrent protector at Point A will trip open.B. The ground fault will heavily damage the service.C. Nothing will happen until a second ground fault occurs.D. The overcurrent protection will trip, shutting off all the line side power.7. Complete solution. Include phase angles if possible.