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400.000 300.000 200.000 Current limitation curves -LPN-RK 250V LPS-RK 600V 100.000 80,000 60.000 40.000 30.000 20.000 Instantaneous peak let-through current amperes 10,000 8000 6000 4000 3000 2000 000 Suge 00 30 00000 Prospective short circuit current-symmetrical rms amperes

400.000 300.000 200.000 Current limitation curves -LPN-RK 250V LPS-RK 600V 100.000 80,000 60.000 40.000 30.000 20.000 Instantaneous peak let-through current amperes 10,000 8000 6000 4000 3000 2000 000 Suge 00 30 00000 Prospective short circuit current-symmetrical rms amperes

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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For problems 18 and 19, use the chart from Figure 17-27 to determine the approximate current values for a 60-ampere, 250-volt fuse when the prospective short-circuit current is 40,000 amperes.

18.The instantaneous peak let-through current is approximately _______  amperes.

19.The apparent rms current is approximately ______ amperes.

20. A section of plug-in busway nameplate indicates that the busway is braced for 14,000 amperes. The available fault current is 30,000 amperes. Using Figure 17-27, determine whether a 200-ampere, 250-volt, dual-element fuse will limit the current sufficiently to protect the busway against a possible fault of 30,000 amperes. Explain.

 

400.000 300.000 200.000 Current limitation curves -LPN-RK 250V LPS-RK 600V 100.000 80,000 60.000 40.000 30.000 20.000 Instantaneous peak let-through current amperes 10,000 8000 6000 4000 3000 2000 000 Suge 00 30 00000 Prospective short circuit current-symmetrical rms amperes
Transcribed Image Text:400.000 300.000 200.000 Current limitation curves -LPN-RK 250V LPS-RK 600V 100.000 80,000 60.000 40.000 30.000 20.000 Instantaneous peak let-through current amperes 10,000 8000 6000 4000 3000 2000 000 Suge 00 30 00000 Prospective short circuit current-symmetrical rms amperes
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