Diagram
SK00495GB.fm 21
10. Diagram
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! The larger one of both cross sections has to be chosen.
Example:
Nominal voltage 1 ~ 115 V, 60 Hz
Rated current 15 A Line length 100 m
15 A x 80 m = 1200 A x m
Cross section as per diagramm: 6 mm
2
Cross section as per table: 15 A : 1 mm
2
Chosen cross section: 6 mm
2
Voltage - Frequency - Curves
Cross-section area of cable in mm
2
Minimum cross-section
area according to VDE
Max. Max.
Cable load fuse
mm
2
AA
115 10
1,5 18 10/3~16/1~
2,5 26 20
434 25
644 35
10 61 50
16 82 63
25 108 80
Rated current x length of cable A x m
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