Wiring Rules; Selecting The Power Leads - Siemens ECOFAST Handbuch

2.1

Wiring Rules

Warning
Hazardous voltages! These may cause electric shock and burns.
Disconnect the system and device from the supply before starting work.
2.1.1

Selecting the power leads

The core cross-section of the power leads must be matched to the respective
ambient conditions. The decisive factors for choosing the core cross-section are
as follows:
• set current on the device
• method of installation
• ambient temperature
• type of material (PVC, rubber)
For PVC power leads installed in a cable duct, for example, the maximum
current carrying capacity as a function of ambient temperature is as follows:
Ø
2
1.5 mm
2
2.5 mm
2
4.0 mm
Observe the following rules when carrying out wiring:
Current carrying capacity of the plug connection as a
function of the connectable core cross-sections and
ambient temperature
Permissible outer diameter of the cable
sealing insert
Length of insulation to strip from cores
Length of insulation to strip from cable sheath
Table 2-1: Rules for wiring
ECOFAST Motor Starters
GWA 4NEB 950 5221-12 DS 02
T
30 °C 40 °C
U
14 A 12.2 A
19 A 16.5 A
26 A 22.6 A
Rules for flexible cables
Wiring and interfaces
45 °C 50 °C
11.1 A 9.9 A
15.0 A 13.5 A
20.5 A 18.5 A
Data
T =
u
55 °C
2
1.5 mm 12 A
2
2.5 mm 20 A
2
4.0 mm 30 A
green 7.0 to 10.5 mm
red 9.0 to 13.0 mm
white 11.5 to 15.5 mm
8 mm
20 mm
55 °C
8.5 A
11.6 A
15.9 A
40 °C
15 A
25 A
35 A
2-3