83-507-013 Rev. A
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minimize the voltage drop (1V typical maximum) to prevent excessive output power consumption
from the power supply and poor dynamic response to load changes. Please refer to Tables 3-2
and 3-3 for minimum wire length (to limit voltage drop) in American and European dimensions re-
spectively.
Maximum length in Feet to limit
voltage drop to 1V or less
Wire size
AWG
Resistivity
OHM/1000ft
5A 10A 20A 50A 150A
14 2.526
80
40
20
8 2
12 1.589
120
60
30
12
3.4
10 0.9994
200
100
50
20 6
8 0.6285
320
160
80
32
10
6 0.3953
500
250
125
50
16
4 0.2486
800
400
200
80
26
2 0.1564
1200
600
300
125
40
0 0.0983
2000
1000
500
200
68
Table 3-2: Maximum wire length for 1V drop on lead (in feet)
Maximum length in meters to limit
voltage drop to 1V or less
Cross sect.
area
(mm²)
Resistivity
OHM/Km
5A 10A 20A 50A 150A
2.5 8.21
24.0
12.0
6.0
2.4
0.8
4 5.09
39.2
18.6
9.8
4.0
1.4
6 3.39
59.0
29.4
14.8
5.8
2.0
10
1.95 102.6 51.2 25.6 10.2 3.4
16
1.24 160.0 80.0 40.0 16.0 5.4
25 0.795
250.0
125.0
62.0
25.2
8.4
35 0.565
354.0
177.0
88.0
35.4
11.8
Table 3-3: Maximum wire length for 1 V drop on lead (in meters)
For currents not shown in Table 3-2 and 3-3, use the formula:
Maximum length=1000/(current x resistivity)
Where current is expressed in Amperes and resistivity in ohms/km or ohms/1000ft.
3.9.3 Wire
termination
The wires should be properly terminated with terminals securely attached. DO NOT use unterm- inated
wires for load connection at the power supply.
3.9.4 Noise and Impedance Effects
To minimize the noise pickup or radiation, the load wires and remote sense wires should be twisted pairs
to the shortest possible length. Shielding of sense leads may be necessary in high noise environments.
CAUTION
When local sensing, a short from +LS or +S to -V or -S or -LS,
will cause damage to the power supply. Reversing the sense
wires might cause damage to the power supply in local and
remote sensing. (Do not connect -S to +V or +S to -V).
