Residential Construction Academy: House Wiring (MindTap Course List)
5th Edition
ISBN: 9781337402415
Author: Gregory W Fletcher
Publisher: Cengage Learning
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Question
Chapter 14, Problem 1RQ
To determine
The full-load current for a single-phase motor.
Expert Solution & Answer
Answer to Problem 1RQ
12 A
Explanation of Solution
Given:
The power of motor is 2 hp.
The voltage is 230 V.
Table 430.248 of the National Electric Code (NEC) is used to determine the full-load current of a single-phase motor.
The table 430.248 of the National Electric Code (NEC) is shown below:
| Horsepower | 115 V | 200 V | 208 V | 230 V |
| 1/6 | 4.4 | 2.5 | 2.4 | 2.2 |
| 1/4 | 5.8 | 3.3 | 3.2 | 2.9 |
| 3/4 | 7.2 | 4.1 | 4.0 | 3.6 |
| 1/2 | 9.8 | 5.6 | 5.4 | 4.9 |
| ¾ | 13.8 | 7.9 | 7.6 | 6.9 |
| 1 | 16 | 9.2 | 8.8 | 8.0 |
| 1 ½ | 20 | 11.5 | 11.0 | 10 |
| 2 | 24 | 13.8 | 13.2 | 12 |
| 3 | 34 | 19.6 | 18.7 | 17 |
| 5 | 56 | 32.2 | 30.8 | 28 |
| 7 ½ | 80 | 46.0 | 44.0 | 40 |
| 10 | 100 | 57.5 | 55.0 | 50 |
Here, the full-load current is in Ampere (A).
Thus, the full-load current for 2 hp and 230 V is 12 A.
Conclusion:
The full-load current for single-phase motor is 12 A.
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