NGPS – User’s Manual
39
Wire Cross
Section Area
[mm
2
]
Resistivity [Ω/km]
@ 20°C
Maximum Cable length in meters to limit voltage drop to be
less than 2 V (1 V per lead)
120 A
200 A
300 A
35
0.524
16
-
-
50
0.387
21
-
-
70
0.268
31
18,5
-
95
0.193
43
25,5
17
120
0.153
54
32,5
21,6
150
0.124
66
40,1
26,7
Table 10:
Wire selection
For higher lengths and/or higher currents it is advisable to use more than one cable in
parallel for each polarity. In those cases, a detailed design of the lines shall be prepared
by a Qualified Installer according to standards (e.g. IEC 60364-5-52).
Voltage ratings of the cable shall be rated for the maximum output voltage of the NGPS
power supply.
By using the values reported in
: Wire selection, the maximum voltage
applied to the load will be:
V
DC
N
+ V
S
max
– V
cable
,
Where:
•
V
DC
N
: NGPS nominal output voltage;
•
V
S
max
: Maximum compensation Voltage if Remote sensing is used (N.B.
Maximum compensation Voltage is 1 V for all models);
•
V
cable
: Cable Drop Voltage.
Lug terminal connection
Screws provided with the NGPS should be used for screw the
cable lug. Maximum length of the screws is 20 mm. Longer
screws may damage the power supply.
Tightening torque shall be between 4 to 5 Nm.
Always use spring washer and plane washer for a reliable
connection.
The load needs to be connected to the output terminals placed on the rear panel
of the unit as shown in
. This type of terminals offers a convenient and reliable
form of connection. These screw connections accept standard
M8
connections and the
terminals are already threaded. Cable lug terminal shall be for M8 screws.
CAUTION
