EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN: 9781337516549
Author: Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Chapter 20.2, Problem 12R
a.
To determine
State the required size of
b.
To determine
State the required size of
c.
To determine
State the required size of
d.
To determine
State the required size of
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3. The three bus-bar conductors in an outdoor sub-station are supplied by units ofpost insulators. Each unit
consists of a stack of 3-pin insulators fixed one on the top of the other. The voltage across the lowest
insulator is 8-45 kV and that across the next is 7-25 kV. Find the bus-bar voltage of the station.
[38-8 kV]
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.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.
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- A? Conductor is defined in NEC 240.2 as a conductor, other than a service conductor, having overcurrent protection ahead of its point of supply that exceeds the value permitted for similar conductors that are not taps. A. Faulted b. Tap c. Magnetic d. Copper-likearrow_forwardFour No. 12 and four No. 10 conductors are to be installed in a EMT conduit 600 V jacketed. What size EMT conduit is required if a. The conductors are Type T90 Nylon? b. The conductors are Type RW90?arrow_forward1. Which of the following statements about equipment grounding conductors is true?A. Unacceptable equipment grounding conductors include conduit, tubing, and cable armor.B. They must be capable of withstanding the higher level of ground-fault current to perform their safety function.C. They increase voltages above ground potential on conductors and equipment enclosures during normal operation.D. When they're far from their associated circuit conductors, impedance values are kept as low as possible during ground-faultconditions.arrow_forward
- 3. With respect to conductor insulation, describe the following location ratings: a. Dry b. Damp c. Wetarrow_forwardH2. A/An _______ is an insulating tube or sleeve that protects an electrical conductor where it passesthrough a hole.A. expansion fittingB. couplingC. gland nutD. bushing H3. Conductors that are larger than AWG size 8 will come only as a/an _______ conductor.A. aluminumEnd of examB. coveredC. solidD. strandedarrow_forward1. _______ is not considered an effective ground-fault current path. a) Ground b) Equipment grounding conductors c) Equipment bonding jumpers d) Grounded conductors 2.Which of the following is not a conductor in the grounding and bonding scheme for an ungrounded system? a) Grounding electrode conductor for grounding equipment enclosures and conductive parts b) Equipment grounding conductor c) Bonding conductors or jumper d) System grounded conductorarrow_forward
- Define service-drop conductors.arrow_forwardDefine an equipment grounding conductor.arrow_forwardCount 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 ofarrow_forward
- 10. Main bonding jumpers are required to be made of _______ or other corrosion-resistant material.A. copperB. aluminumC. copper-clad aluminumarrow_forwardMost residential general lighting circuits are wired with 14-AWG copper conductors and are protected by 15-amp circuit breakers. However, there are many electricians who install 12-AWG copper conductors and protect them with 20-amp circuit breakers. How will you know which conductor size and which circuit breaker size will be used for the general lighting branch circuits in the house you are wiring?arrow_forward20.a. What's the primary disadvantage of using copper conductors?A. DurabilityB. CostC. AvailabilityD. Weight20.b. The NEC requires that each service-disconnecting means be suitable forA. hazardous locations.B. disconnecting the meter.C. wet conditions.D. the prevailing conditions 20.c. As a general rule, each building or structure is limited to a single service. What's an automatic exceptionto this rule?A. A second service deemed suitable for useB. A second service having the proper markingsC. Emergency systems or fire pumpsD. Higher building occupancyarrow_forward
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