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Table 2-11. Wire Data
Copper Area,
AWG
6
8
0.0837
10
0.0526
12
0.0331
14
0.0208
16
0.0131
18
0.00823
20
0.00518
22
0.00326
W
V
IRE
OLTAGE
For applications where regulation is important, the contribution of the load
wiring to voltage drop between source terminals and the load must be
considered. The wire gauge must be selected to maintain an acceptable total
voltage drop for the load wiring under the maximum peak current. The
resistance of the load wiring must be determined for the sum total length of
the output lead and the return lead. The total voltage drop is the sum of the
individual drops in the output and return leads. Table 2-11 gives the
resistance per meter (m) of various wire gauges at 20 °C and 100 °C.
Use the following equation to calculate the resistance for other wire
temperatures:
The voltage drop (per output or return lead) could be calculated using the
following equation:
2-28
Resistance,
Ω /m at 20 °C
2
cm
0.133
0.0013
0.0021
0.0033
0.0052
0.0083
0.0132
0.0209
0.0333
0.053
D
ROP
R = R20 °C x [1 + 0.004 x (T - 20 °C)]
where,
R = resistance, Ω/m, at temperature T
R20 °C = resistance, Ω/m, at 20 °C
T = temperature of wire, °C
V = I x L x R20 °C x [1 + 0.004 x (T - 20 °C)]
where,
V = total voltage drop, V
I = current, A
L = length of wire, m
R20 °C = resistance of wire, Ω/m, at 20 °C
T = temperature of wire conducting current, °C
Resistance,
Current Rating,
Ω /m at 100 °C
A for 30ºC Rise
0.0017
0.0028
0.0044
0.0069
0.011
0.0174
0.0276
0.044
0.07
ReFlex Power™
54
40
27
21
16
12
10
7.5
5.5
M380056-01 Rev L
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