5
24
25
25
30 32
42
48
50
50
60 63
3 32
100 100
110
120
125
150 160
220 250
110-220
120 240
250 125
300 320
220 440 500 250
600 630
480 960 1000 500
1.c. This because the actual voltage to
earth determ ined the insulation resistance and capacitive reactance each
line-to-earth; thus, low (but acceptable) insulation resistance one line can in
effect earth and raise the other two line-to-line voltage earth.c. d. systems
(based VDE 0110-1)_______________________________________
Nominal voltage
o the
supply system
For insulation
line-to-line11
For insulation
line-to-earth"
All systems three-wire-systems
mid-point earthed
V V
12.5 12.168
Table 4.19: Single-phase three two-wire a.
.000 1,000
1) Line-to-earth insulation level unearthed pedance-earthed system equals
that line-to-line because the operating voltage earth any line can, in
practice, approach line-to-line voltage
