# Engineering Specification

Document source : www.fordemc.com

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Engineering Specification
ES-3U5T-1B257-AA
EMC Design Guide for Printed Circuit Boards
Frame 40 of 78
Rev. A
10/01/2002
Printed copies are uncontrolled
3.10. Resistance
Table 3­8 shows some wire characteristics (AWG is the American Wire Gauge).
Table 3­8. Resistance in Wires
AWG
Number of
strands
Strand
diameter
(inches)
Cable
diameter
(inches)
M
per foot
@ 20ûC
1
19 0.0664 0.332 0.1288
2
7 0.0974 0.292 0.1644
4
7 0.0772 0.232 0.2582
6
7 0.0612 0.184 0.4105
8
7 0.0486 0.147 0.6528
10 7
0.0385
0.116
1.028
12 7
0.0305
0.096
1.650
14 7
0.0242
0.073
2.624
16 7
0.0192
0.060
4.172
18 7
0.0152
0.048
6.636
20 7
0.0121
0.035
10.54
22
7 0.010 0.030 14.74

Equation 3­20 gives the resistance (R) of a solid copper slab:
wt
l
10
724
.
1
R
6
×
×
=
-
[]
Equation 3­20. Resistance in Copper
Where,
1.724x
x
x
x
10
-6
-cm equals the resistivity () of copper
t is the thickness in cm
w is the width in cm
l is the length of the slab in cm

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Summary :

## Resistance in Wires AWG Number of strands Strand diameter (inches) Cable diameter (inches) M per foot @ 20ûC 1 19 0.0664 0.332 0.1288 2 7 0.0974 0.292 0.1644 4 7 0.0772 0.232 0.2582 6 7 0.0612 0.184 0.4105 8 7 0.0486 0.147 0.6528 10 7 0.0385 0.116 1.028 12 7 0.0305 0.096 1.650 14 7 0.0242 0.073 2.624 16 7 0.0192 0.060 4.172 18 7 0.0152 0.048 6.636 20 7 0.0121 0.035 10.54 22 7 0.010 0.030 14.74 Equation 3­20 gives the resistance (R) of a solid copper slab: wt l 10 724 .

Tags : resistance,copper,table,wire,printed,equation,awg,inches,slab,diameter,3­8,3­20,boards
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