4.5 LEARNING OBJECTIVES 215
120 V
Metallic chassis
−
+ Unintended connection
(wiring fault)
(a)
B
120 V Load
?
Metallic chassis
−
+ Unintended connection
(wiring fault)
(b)
B
120 V Load
IG
Metallic chassis
−
+ Unintended connection
(wiring fault)
(c)
B
G
W
W
G
W
120 V GFCI Load
Sensing coil
IB
IW
Figure 4.4.4Appliance with wiring fault.Note:Currents and voltages
shown are rms magnitudes.(a)Ungrounded chassis.(b)Grounded chassis.
(c)Grounded chassis with GFCI in circuit.
4.5 Learning Objectives
Thelearning objectivesof this chapter are summarized here, so that the student can check whether
he or she has accomplished each of the following.
- Phase sequence of balanced three-phase voltages and currents.
- Wye–delta and delta–wye conversions for networks containing impedances.
- Circuit analysis with balanced three-phase source and balanced wye-connected load.
- Circuit analysis with balanced three-phase source and balanced delta-connected load.
