EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN: 9781337516549
Author: Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Chapter 21.1, Problem 5R
To determine
Mention the size rating of the fuses installed when an additional backup overcurrent protection needed.
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3. What size inverse time circuit breaker will be required for short-circuit and ground-
fault protection for a 1 horsepower, 120-volt motor?
All answers should be written in complete sentences. Calculations should be shown in detail, and Codereferences should be cited when appropriate. Unless otherwise stated, all conductors are copper type THHN, and the supply is AC.
1. What is the minimum conductor ampacity, overload protection, and dual-element fuserating for a circuit supplying a 560-volt, 3-phase, code J, 40°C, 125-horsepower motorwith a nameplate full-load current of 115 amperes?
True or False
1. The point of connection of a motor for its electrical supply is called junction box.
2. The bearing placed in the shaft of the generator is included as stator part.
3. Basically, not all generators are AC generator at first, even DC generator
4. DC generator can be used as an emergency generator.
5. Circuit breakers are used in a motor circuit protection rather than fuses (safety switch).
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EBK ELECTRICAL WIRING RESIDENTIAL
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- 5. An automatic switch or cutout is allowed in the equipment grounding conductor circuit when A. there's a redundant equipment grounding conductor in the circuit. B. the power sources are disconnected when operated. C. it's bonded around the disconnecting device. D. it also opens the neutral.arrow_forwardLockout is required: During servicing and maintenance where unexpected ener- gization or start-up of equipment could harm employees. During repair and replacement work, and during renovation work. a. b. C. During modifications or other adjustments to powered equipment. d. All of the above. Lockout may involve: Opening a disconnect switch. b. a. Closing a valve. Placing a block in the equipment. d. All of the above. C. Lockout is the process ci Shutting off a machine at the end of a shift. Warning equipment operators about the risks involved in bypassing a machine guard. Preventing the flow of energy from a power source to a piece of equipment, and keeping it from operating. a. b. C. d. Preventing mechanics from starting repairs without the machine operators' knowledge. Tagout: Serves as a warning. b. Physically restrains a person from operating a power source. Must be applied using specialized tagout tools. a. C. d. Must be worn like a badge by the employee who is doing the repairs.…arrow_forwardWho has the responsibility for Code interpretations? When are rules in the PEC mandatory and when are they advisory? What color-coding is required on multiwire branch circuits? What is the basis for figuring the general lighting loads in occupancies?arrow_forward
- Your Answers may be presented through Discussions, Drawings/Figures/Diagrams, Reference to NEC/PEC and Computations. 8. What is the minimum conductor ampacity, overload protection, and dual-element fuse rating for a circuit supplying a 560-volt, 3-phase, code J, 40°C, 125-horsepower motor with a nameplate full-load current of 115 amperes?arrow_forwardFor motor Branch circuits, the maximum setting of a conventional inverse - time circuit breaker must not exceed____of the full- load current of the motor. a.100% b.125% c.200% d.250%arrow_forwardDiagram 43 gives the voltage pulses created by the apparatus of diagram 42. The period of the induction coil interrupter is given by approximately what value? Group of answer choices: - 1/500,000 seconds - 1/100,000 seconds - 1/500 seconds - 1/550,000 seconds - cannot tell with only the information given in the grapharrow_forward
- 45. A switch or circuit breaker can be used as both the controller and disconnecting means if it a. opens all ungrounded conductors as required by NEC 430.103 b. is protected by an overcurrent device in each ungrounded conductor c. is manually operable, or both power and manually operable d. All of these answersarrow_forwardFault analysis is done to decide the __________________ of switch gear. a. breaking current b. reactance c. negative sequence relay d. relayarrow_forwardA 25-HP, continuous-duty, three-phase squirrel-cage induction motor is connected to a 240-volt line. The conductors are run in conduit to the motor. The motor does not have a NEMA design code listed on the nameplate. The termination temperature rating of the devices is not known. Copper conductors with THWN insulation are to be used for the motor connection. What size conductors should be used?arrow_forward
- (b) () Discuss the cascade control scheme for a heat exchanger system with a neat diagram. (ii) List down any two merits and two demerits of a cascade control system over ratio control system.arrow_forwardDraw the power circuit and control circuit of a Direct On Line Motor Starter fo a three-phase motor. Add 4 pilot lights (PL) in the control circuit; red PL for running forward, orange PL for running in reverse, green for not running and yellow for overload.1. List the components used. 2. Procedures.arrow_forwardIf an electrical defect occurs in the electronic powersteering(EPS) system, __ .a. the system continues to operate normally, but theEPS warning light is illuminatedb. the system continues to operate with a slightlyreduced power-steering assistc. the EPS control unit shuts the system down byopening the fail-safe and power relaysd. the EPS control unit locks the armature in thesteering gear to prevent armature and screw shaftdamagearrow_forward
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