ELECTRICAL WIRING:RESIDENT.-TEXT (PB)
19th Edition
ISBN: 9781337116213
Author: MULLIN
Publisher: CENGAGE L
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Textbook Question
Chapter 24, Problem 6R
The nameplate on a transformer will indicate whether or not it is a Class 2 transformer.
(True) (False) (Circle the correct answer.)
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➤ 1. What is the role of the current transformer and voltage transformer?
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➤ 3. Why the secondary side of the CT is never allowed to open the circuit
during operation?
Consider a 5A ammeter is connected to the secondary side of a 100/5A current transformer (CT) in order to measure the current of the circuit. Safety considerations require that the CT has to be short circuited (or the primary circuit switched off) during a replacement of the ammeter. Explain why this is needed.
Chapter 24 Solutions
ELECTRICAL WIRING:RESIDENT.-TEXT (PB)
Ch. 24 - Prob. 1RCh. 24 - Prob. 2RCh. 24 - Prob. 3RCh. 24 - In a home, the low-voltage wiring between the...Ch. 24 - Prob. 5RCh. 24 - The nameplate on a transformer will indicate...Ch. 24 - If Class 2 conductors are insulated for 150 volts,...Ch. 24 - If you use 600-volt rated conductors for Class 2...Ch. 24 - The NEC is very strict about securing anything to...Ch. 24 - Does the Code permit attaching the low-voltage...
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- 12. If overcurrent protection is provided in the transformer of a separately derived system, which of the following statements is correct?A. A ground electrode must be present at the transformer and the building's disconnect.B. There's no need for service equipment or a panelboard in the separate building.C. An equipment grounding conductor must be run with the conductors between the transformer and the building's disconnect.D. The neutral should be bonded to the equipment grounding conductor at the service equipment in the separate building.arrow_forwardQ6) In Current transformer Primary turns is __________ than Secondary turns. a. Less b. none c. Same d. Morearrow_forwardchoose correct ans onlyarrow_forward
- 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-typearrow_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_forwardthe current that is required to magnetize the core of a transformer is called____. A- primary full-load current, B- secondary no-load current, C excitation current. D- none Does the value of the excitation current change from no-load to full-load? A- yes B- no does the ratio of excitation current to output load current change from no-load to full-load? A- yes , B- noarrow_forward
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