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Selection of required cross section for extension of cables and power lines
This procedure takes into consideration:
1.
The ohmic and inductive resistance of the line with an admissible loss of voltage of 5% and cos phi =
0,8 as per voltage-frequency-curves.
2.
The admissible warming-up of the lines as per VDE standard (table of required minimum cross section).
ATTENTION!
Example:
Nominal voltage 3 ~ 400 V, 50 Hz
Rated current 15 A
15 A x 100 m = 1500 A x m
Cross section as per diagramm: 2,5 mm
Cross section as per table: 15 A : 1 mm
Chosen cross section: 2,5 mm
Voltage - Frequency - Curves
Cross-section area of cable in mm
Rated current x length of cable A x m
SK00001GB
The larger one of both cross sections has to be chosen.
Line length 100 m
2
2
2
2
Cable
mm
1,5
2,5
12
DIAGRAM
Minimum cross-section
area according to VDE
Max.
Max.
load
fuse
2
A
A
1
15
10
18
10/3~16/1~
26
20
4
34
25
6
44
35
10
61
50
16
82
63
25
108
80
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