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Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818

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Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 3, Problem 25SQ
Textbook Problem
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Select the best answer for each of the following.

The thermal relay heating element is selected

  1. a. 15 percent under voltage.
  2. b. 10 percent over voltage.
  3. c. from the motor’s FLA and a manufacturer’s selection chart.
  4. d. by ambient temperature.

To determine

Choose the best option from which the thermal relay heating element is selected.

Explanation of Solution

Discussion:

The thermal relay heating element is selected from the list of motor’s Full-Load-Amperage (FLA) or full-load-current and a manufacturer’s selection chart. Refer to Figure 3-16 in the textbook for a typical overload heater chart.

The NEC® (National Electrical Code) and local codes specify the size of the overload heaters as percentage of the full-load motor current. According to the NEC®, the size of the overload heaters is generally 125% of the full-load motor current...

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