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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/meter
Resistance
in 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.
Figure 2-1 illustrates 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 figure, current requirements may vary widely based on the way the equipment is connected
to the power bus.
MCCD
(256 channels)
MCCD
(256 channels)
P
o
w
e
r
S
o
u
r
c
e
(24 V
@
133 A
)
Powerbus Load
P
o
w
e
r
S
o
u
r
c
e
(24 V @ 133 A)
+
_
+
_
+
_
+
_
+
_
maximum
discharging
current = 174A
maximum
charging
current = 266A
+ -
charging = 133A
discharging = 87A
charging = 133A
discharging = 87A
discharging = 174A
charging = 133A
charging = 133A
MCCD
(256 channels)
P
o
w
e
r
S
o
u
r
c
e
(24 V
@
133 A
)
Powerbus Load
P
o
w
e
r
S
o
u
r
c
e
(24 V @ 133 A)
+
_
+
_
+
_
+
_
A
gilen
t E
4370A
MCCD
(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
3
3
A
133A
1
7
4
A
133
A
/87
A
1
3
3
A
/
8
7A
A
gile
nt E
4370A
A
gi
lent E
4371A
A
gile
nt E
4371A
A
gilent E
4370A
A
gilen
t E
4370A
Figure 2-1. Typical Power Bus Configurations