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Max. cable capacity
Rated
cross-section
Type of cable
1 lines
mm
2
A
Quadripole
1,5
18
Quadripole
2,5
24
Quadripole
4
32
Quadripole
6
41
Quadripole
10
57
Quadripole
16
76
Quadripole
25
102
Quadripole
35
126
Unipolar
60
168
Unipolar
70
213
Unipolar
95
258
Unipolar
120
300
Unipolar
150
350
Unipolar
185
392
Unipolar
240
461
Electrical cables - Direct starting - 3 phase motor
Rated poxer
Rated
Rated
of motor
voltage
current
HP
kW
V
A
1
220
1,9
178
240
1,7
231
0,5
0,37
380
1,1
531
400
1,0
611
415
1,0
691 1028
220
2,7
127
240
2,5
167
0,75
0,55
380
1,6
378
400
1,5
435
415
1,4
500
220
3,6
95
240
3,3
131
1
0,75
380
2,1
284
400
2,0
335
415
1,9
390
220
5,4
63
240
5,0
87
1,5
1,1
380
3,1
189
400
3,0
223
415
2,9
260
220
6,6
51
240
6,1
67
2
1,5
380
3,8
153
400
3,6
176
415
3,5
199
220
8,5
39
240
7,8
52
3
2,2
380
4,9
117
400
4,7
135
415
4,5
155
Max. cable lenght with 5% voltage drop
16
Resistance
Reatance
2 lines
4 lines
R
X
A
A
/Km
/Km
16
14
15,1
0,118
21
19
9,08
0,109
28
26
5,63
0,101
36
33
3,73
0,0955
50
46
2,27
0,0861
68
61
1,43
0,0817
89
82
0,907
0,0813
110
101
0,654
0,0753
146
134
0,473
0,101
185
170
0,326
0,0955
224
206
0,236
0,0955
261
240
0,188
0,0939
305
280
0,153
0,0928
341
314
0,123
0,0908
401
369
0,0943
0,0902
TAB. 4
Cable section (mm
2
) - Quadripolar cables
1,5
2,5
4
6
10
16
265
439
706 1060
344
570
915
791
908
189
313
503
755
248
412
660
990
563
834
847 1073
743
142
235
377
566
822
194
321
515
772
422
700
498
825
580
961
94
156
251
377
615
963
129
241
344
515
636
282
467
750
332
550
883
387
641 1027
76
127
203
305
497
780
99
164
263
395
642 1003
228
377
606
911
261
433
698 1045
296
491
787
59
97
156
234
382
599
77
127
204
307
499
779
175
290
465
899
201
333
534
802
230
381
611
917
5.2
HOW TO DETERMINE THE POWER SUPPLY CABLE
To determine the size of the power cable for the submersible motor, the
following information is required:
- V: Rated value of input voltage (V)
- I: Current consumption of motor, indicated on the motor rating plate (A)
- L: Length of line
- Cosf: Motor power factor (indicated on the rating plate)
- Room temperature (°C)
- Current carrying capacity of cable
Choose the minimum cross-section from the value I of the rated current of
the motor, according to the maximum current carrying capacities of cables
indicated in Table 4. Quadripolar cables are used for cables up to a cross-
section of 35 mm˝, while unipolar cables are recommended for larger cross-
sections.
Table 4 indicates maximum current carrying capacities of cables according
to the number of lines that are connected in parallel:
just one line
direct motor starting
stator motor starting
two lines
star/delta starting
two lines in parallel in order to use lighter cables
four lines
star/delta starting with double lines.
For star/delta starting, the current in the cables is equal to the rated current
divided by 1,73.
The maximum current carrying capacities of the cables shown in Table 4
apply for room temperatures of 30° C. If the room temperature is different
apply the correction factor.
The final choice of the cross-section of the cable is carried out by verifying
the voltage drop along the power line, by applying the following relation:
25
V% = 173 x I x L x (R x cos + X x sen ) / V
V% voltage drop in percent (must not exceed is 5%)
I = rated current in Amperes (for star/delta starting the value is 58%)
L = lenght of line in meters (for star/delta starting the lenght is double)
cos = power factor (indicated on the motor rating plate)
sen = ( 1-cos2 )
R,X = resistance and reactance of cable in ohm/metre (indicated in tab.4)
V = input voltage.
The following tables define the maximum lenght of the cables depending
on the power of the motor, input voltage, the size of the cables, all at a
room temperature of 30° C.
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