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Installation - 2
29
Table 2-6. Ampacity and Resistance of Stranded Copper Conductors
AWG No. Area
in mm
2
Ampacity Resistance
in Ω
ΩΩ
Ω/meter
Resistance
in Ω
ΩΩ
Ω/feet
Notes
10
8
6
4
2
1/0
2/0
3/0
4/0
5.26
8.36
13.3
21.1
33.6
53.5
67.4
85.0
107
40
60
80
105
140
195
225
260
300
0.00327
0.00206
0.00129
0.00081
0.00051
0.00032
0.00025
0.00020
0.00016
0.00099
0.00062
0.00039
0.00025
0.000156
0.000098
0.000078
0.000062
0.000049
1. Wire ampacities are based on
30° C ambient temperature with
conductor rated at 60° C.
2. Resistance is nominal at 20° C
wire temperature.
Power Bus Configuration Examples
Figures 2-1 and 2-2 illustrate two typical power bus configurations consisting of two Agilent E4370A
MCCD mainframes connected to one Agilent E4371A Powerbus Load and two external dc power
supplies. As shown in the figures, current requirements may vary widely based on the way the equipment
is connected to the power bus.
(256 channels)
(256 channels)
P
o
w
e
r
S
o
u
r
c
e
(
2
4
V
@
1
4
6
A
)
Powerbus Load
P
o
w
e
r
S
o
u
r
c
e
(24 V @ 146 A)
+
_
+
_
+
_
+
_
+
_
maximum
discharging
current = 140A
maximum
charging
current = 292A
+ -
charging = 146A
discharging = 70A
charging = 146A
discharging = 70A
discharging = 140A
charging = 146A
charging = 146A
+4 E4374A cards
(256 channels)
P
o
w
e
r
S
o
u
r
c
e
(
2
4
V
@
1
4
6
A
)
Powerbus Load
P
o
w
e
r
S
o
u
r
c
e
(24 V @ 146 A)
+
_
+
_
+
_
+
_
A
g
i
l
e
n
t
E
4
3
7
0
A
(256 channels)
+
_
+
_
T
e
r
m
i
n
a
l
B
l
o
c
k
STAR CONFIGURATION
Rigid Bars
Flexible Wires
BUS BAR CONFIGURATION
Flexible Wires
1
4
6
A
146A
1
4
0
A
146A/70
A
1
4
6
A
/
7
0
A
A
g
i
l
e
n
t
E
4
3
7
0
A
A
g
i
l
e
n
t
E
4
3
7
1
A
A
g
i
l
e
n
t
E
4
3
7
1
A
A
g
i
l
e
n
t
E
4
3
7
0
A
A
g
i
l
e
n
t
E
4
3
7
0
A
+4 E4374A cards
+4 E4374A cards
+4 E4374A cards
Charging values based on:
Power/channel = 11W
Efficiency = 80%
Power bus voltage = 24V
Discharging values based on:
Power/channel = 9W
Efficiency = 80%
Power bus voltage = 26.5V
Figure 2-1. Typical Power Bus Configuration for Agilent E4374A cards