Note that the minimum wire size required to prevent overheating may not be large enough to prevent
over-voltage tripping or maintain good regulation. Under most conditions, the load wires should also
be heavy enough to limit the voltage drop to no more than l.0 V per lead.
To help prevent nuisance tripping of the over-voltage circuit, select a wire size sufficient to handle the
FULL output current of the unit no matter what the intended load current or current limit setting.
Load lead resistance is also an important factor relating to the CV stability of the instrument when
remote sensing capacitive loads. If high capacitance loads are expected, you should not use wire
gauges heavier than 12 to 14 AWG for long runs of load lead.
Wire Size Metric size (Note1) Resistance Max length to limit voltage to 1 V/lead
for 5 A for 10 A for 20 A for 50 A
AWG 2 wires
bundled
4 wires
bundled
Ω per foot Wire length in feext
20 7.8 6.9 0.0102
20 x x x
18 14.5 12.8 0.0064
30 15 x x
16 18.2 16.1 0.0040
50 25 x x
14 29.3 25.9 0.0025
80 40 20 x
12 37.6 33.2 0.0016
125 63 30 x
10 51.7 45.7 0.0010
200 100 50 20
8 70.5 62.3 0.0006
320 160 80 32
6 94 83 0.0004
504 252 126 50
Area in mm
2
2 wires
bundled
4 wires
bundled
Ω per meter Wire length in meters
0.5 7.8 6.9 0.0401
5 x x x
0.75 9.4 8.3 0.0267
7.4 x x x
1 12.7 11.2 0.0200
10 5 x x
1.5 15.0 13.3 0.0137
14.6 7.2 x x
2.5 23.5 20.8 0.0082
24.4 12.2 6.1 x
4 30.1 26.6 0.0051
39.2 19.6 9.8 3.9
6 37.6 33.2 0.0034
58 29 14.7 5.9
10 59.2 52.3 0.0020
102 51 25 10.3
Notes:
1. Capacity for AWG wires from MIL-W-5088B. Maximum ambient temperature: 55°C. Maximum wire temperature: 105°C
2. Capacity for metric wires from IE Publication 335-1.
3. Capacity of aluminum wire is approximately 84% of that listed for copper wire.
4. “x” indicates wire is not rated for the maximum output current of the power module.
5. Because of wire inductance considerations, it is also recommended that you keep your load leads twisted, tie wrapped, or
bundled together and less than 50 feet (14.7 meters) in length per lead.
Keysight N6705C Operating and Service Guide 57
2 Installation
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