Table of Contents
Advertisement
Installation
Table 2-8 identifies ratings for popular DC and AC power source cable wire gauges.
C
1:
OLUMN
SIZE
(AWG)
14
12
10
8
6
4
2
1/0
3/0
Table 2-8 Recommended Wire Gauge Selection Guide
The following notes apply to Table 2-8 and to the power cable definition:
1.
The above figures are based upon insulated copper conductors at 25 C (77 F),
two current carrying conductors in the cable plus a safety (chassis) ground.
Columns 3 and 4 refer to "one way" ohms and IR drop of current carrying
conductors (e.g., a 50-foot cable contains 100 feet of current carrying
conductor).
2.
Determine which wire gauge for the application by knowing the expected peak
load current (I
and the one way cable length.
The formula below determines which ohms/100 feet entry is required from
Column 3. Read the corresponding wire gauge from Column 1.
(Column 3 value) = V
Where:
Column 3 value = Entry of the table above.
Cable length = One way cable length in feet.
V
= Maximum loss, in volts, permitted within cable.
loss
2-14
C
2:
OLUMN
AMPERES
OHMS/100 FEET
(MAXIMUM)
15
20
30
40
55
70
95
125
165
), the maximum tolerated voltage loss (V
peak
/[I
x 0.02 x (cable length)]
loss
peak
C
3:
OLUMN
IR DROP/100 FEET
(ONE WAY)
(COL. 2 X COL. 3)
0.257
0.162
0.102
0.064
0.043
0.025
0.015
0.010
0.006
TW 3700 • TW 5550
C
4:
OLUMN
3.85
3.24
3.06
2.56
2.36
1.75
1.42
1.25
1.04
) within the cable,
loss
Elgar TrueWave
Advertisement
Table of Contents
