Electrical Wiring Residential
Electrical Wiring Residential
19th Edition
ISBN: 9781337101837
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Chapter 27, Problem 15R

a.

To determine

Find the number of switches or circuit breakers permitted by a service disconnect.

b.

To determine

Find whether the overcurrent devices require being in one closure.

c.

To determine

Find the type of main disconnect provided in the residence.

d.

To determine

Find whether the city provides more than one service disconnect.

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2) A 208 V, four-pole, 60 Hz, Y-connected, wound-rotor induction motor has a rated power of 30 HP. The components of its equivalent circuit are R1 = 0.100 R2 = 0.070 XM = 10.0 X1 = 0.210 X2 = 0.210 Pmec = 500 W Psup ~ 0 Pcore = 400 W For a slip of 0.05, find: a) The line current b) The stator copper losses PcE c) The air gap power PEF d) The power converted from mechanical to electrical form Pconv e) The induced torque _ind f) load torque _load g) The total efficiency of the machine h) The speed of the motor in revolutions per minute and in radians per second
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