EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN: 9781337516549
Author: Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Chapter 30, Problem 12R
To determine
Choose the correct option from the given statement for the enclosures of transformers and GFCIs and junction boxes having one thing in common.
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The short circuit test is used to measure the __________________________________ of the
transformer.
(a) Brush loss (b) Friction loss (c) Iron loss (d) Copper loss
LOCAL 5652
UNION LABEL
USW
UNITED STEELWORKERS
6. Which one of the following types of construction is used for potential transformers?
A. Window-type
B. Wound-type
C. Bushing-type
D. Bar-type
Calculate the following. a) Expected voltage at “A” with switch SW1 open. b) Expected voltage at “A” with switch SW1 closed.
Chapter 30 Solutions
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- What two types of chime transformers for Class 2 systems are listed by UL? ___________________________ ___________________________arrow_forwardThe copper loss of a certain transformer at full-load is 220W. Then the copper loss at half full-load will be__________________. copper loss at half loadarrow_forwardTwo different transformers details are tabulated below. Calculate the missed values in the table. Secondary terminal voltage of the second transformer is 487.5V when loaded. Determine the regulation of the transformer.?arrow_forward
- The term "____" is defined in NEC® Article 100 as "connected to establish electrical continuity and conductivity." Select one: A. BENDED (BENDING) B. BONDED (BONDING) C. SHUNTED (SHUNTING) D. GROUNDED (GROUNDING)arrow_forward7.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.arrow_forwardRefer to the National Electrical Code or the working drawings when necessary. Whereapplicable, responses should be written in complete sentences.A 300-kilovolt-ampere transformer bank consisting of three 100-kilovolt-amperetransformers has a 3-phase, 480-volt delta primary and a 120/240-volt, 3-phase, 4-wiredelta-connected secondary.For problems 1 through 4 show calculations and/or source of information 1. What is the full-load current in the primary? 2. What is the full-load current in the secondary?arrow_forward
- Refer to the National Electrical Code or the working drawings when necessary. Whereapplicable, responses should be written in complete sentences.A 300-kilovolt-ampere transformer bank consisting of three 100-kilovolt-amperetransformers has a 3-phase, 480-volt delta primary and a 120/240-volt, 3-phase, 4-wiredelta-connected secondary.For problems 1 through 4 show calculations and/or source of information. 1. What is the proper rating of the fuses to install for overcurrent protection of thesecondary?2. What is the kilovolt-ampere of the bank if one of the transformers is removed?arrow_forwardRefer to the National Electrical Code or the working drawings when necessary. Whereapplicable, responses should be written in complete sentences.A 300-kilovolt-ampere transformer bank consisting of three 100-kilovolt-amperetransformers has a 3-phase, 480-volt delta primary and a 120/240-volt, 3-phase, 4-wiredelta-connected secondary.For problems 1 through 4 show calculations and/or source of information. 1. Sketch the secondary connections, and indicate where a 120-volt load couldbe connected.arrow_forwardWith the basic circuit diagram, explain the restricted earth fault relay for a transformer.arrow_forward
- 5. When should corner pull boxes be used in an installation?A. At all 90 degree bendsB. At all bends less than 90 degreesC. At all bends greater than 100 degreesD. At all bendsarrow_forwardh.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.arrow_forward6.A. How many grounded neutral conductors are in a 208Y/120 volt, 3-phase, 4-wire system?A. ThreeB. TwoC. FourD. One 6.B. A separate building that's supplied with a feeder or branch service will also need aA. separate EGC from the supply EGC.B. transformer for isolation.C. neutral conductor bonded to ground.D. grounding electrode system.arrow_forward
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