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Electrical Applications 2 by David W. Tyler

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10
Transmission
and
distribution
of
electrical energy
the next house between the yellow line and neutral and the next from
blue to neutral.
In industry three-phase loads may use three or four wires.
Load balancing
Figure 1.11
/
R
+/
Y
+/
B
=0
Figure 1.12
Ao
A
Red o.l ft 21A
240
V
Do-
iO I
ft
Neutral 21A C
Figure 1.13
Red o.l ft 7A
o *-
Yellow o.l ft 7A
240 V
Neutral Zero current
JM
Blue 0.1 ft 7A
Phase voltages
=
240 V
Figure 1.14
Consider now the case of three single-phase loads being equal in
magnitude