AMETEK ReFlex - Manual (Page 63)

Mainframe ReFlex Power™
2-28 M380056-01 Rev J
Table 2-11. Wire Data
AWG
Copper Area,
cm
2
Resistance,
Ω/m at 20 °C
Resistance,
Ω/m at 100 °C
Current Rating,
A for 30ºC Rise
6 0.133 0.0013 0.0017 54
8 0.0837 0.0021 0.0028 40
10 0.0526 0.0033 0.0044 27
12 0.0331 0.0052 0.0069 21
14 0.0208 0.0083 0.011 16
16 0.0131 0.0132 0.0174 12
18 0.00823 0.0209 0.0276 10
20 0.00518 0.0333 0.044 7.5
22 0.00326 0.053 0.07 5.5
W IRE V OLTAGE D ROP
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:
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
The voltage drop (per output or return lead) could be calculated using the
following equation:
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