12. A three-phase motor has a nameplate current of 92 amperes. The nameplate indicates a service factor of 1.25, which would size the heaters at 125% of full load current. Using the chart in Figure 4-7B, what size overload heaters should be used to protect this motor?
12. A three-phase motor has a nameplate current of 92 amperes. The nameplate indicates a service factor of 1.25, which would size the heaters at 125% of full load current. Using the chart in Figure 4-7B, what size overload heaters should be used to protect this motor?
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Transcribed Image Text:12. A three-phase motor has a nameplate current of
92 amperes. The nameplate indicates a service.
factor of 1.25, which would size the heaters at
125% of full load current. Using the chart in
Figure 4-7B, what size overload heaters should
be used to protect this motor?

Transcribed Image Text:Overload heater selection for NEMA starter sizes O (D0-4. Heaters ae
calibrated for 115% of motor full load current. Eor beaters thetrs are
correspond to 125% of motor full load current use the next size larger
Size 3 Sze 4
Imetal
tes on
rtion
auses
de by
<pand
<pand
nange
deter-
0,18
0 20
0.22
0.24
0.26
|0,38
0 42
rip.
ends
Figure 4-7B Typical overload heater chart
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