Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 47, Problem 13RQ
If dual-element time-delay fuses are to be used as the short-circuit protective device, what size fuses should be used to protect the circuit in question 12?
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Chapter 47 Solutions
Industrial Motor Control
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- If dual-element time delay fuses are to be used as the short circuit protective device, what size fuses should be used to protect the circuit in question #12? Five 5 HP, three-phase motors with NEMA code B are connected to a 240-volt line. The conductors are copper with type THWN insulation. What size conductor should be used to supply all of these motors?arrow_forwardThe secondary of the transformer in question #3 has a rated voltage of 2400 volts. What size fuse should be used to provide branch circuit protection?arrow_forwardPower-consuming devices are wired in _____(series orparallel).arrow_forward
- A 10 kVA transformer has a primary voltage of 208 volts and a secondary voltage of 120 volts. What size circuit breaker should be used to protect the primary winding?arrow_forwardWhat size conductor should be used to connect the primary of the transformer described in question #6? Assume the conductor to be copper with type THW insulation.arrow_forwardAn inductor has an inductance of 0.025 H and a wire resistance of 3 Ω. How long will it take the current to reach its full Ohm’s law value?arrow_forward
- What size overcurrent device should be used to protect the primary of a 480/120 volt 15 kVA transformer?arrow_forwardRefer to the circuit shown in Figure 1123. What is the function of resistor R3 in the circuit?arrow_forwardThe short-circuit protective device supplying the motors in question #10 is an inverse-time circuit breaker. What size circuit breaker should be used?arrow_forward
- There is an ambient temperature of 65°C with a temperature rating of the conductor as 75°C. What is the ambient temperature correction factor based on 86°F?arrow_forwardWhy is shielded wire used for signal runs?arrow_forwardAn 11-pin control relay contains three sets of single-pole double throw contacts. List the pin numbers by pairs that can be used as normally open contacts.arrow_forward
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