Cross Sectional Area
Cross Sectional Area = N (T x W - A)
Where
|
N
|
= |
Number of Individual Conductors in the Cable |
| |
T
|
=
|
Bare Wire Thickness |
| |
W
|
=
|
Bare Wire Width |
| |
A
|
=
|
Area reduction due to corner radii |
Example:
A
|
=
|
.00879 in2, for T≥.061 in |
| |
|
(0.5671 mm2, for T≥1.55mm) |
| |
|
.2136T2 in2, for T <.061 in |
| |
|
(0.2146T2 mm2, for T < 1.55 mm) |
ASTM/NEMA Corner Radii
Corner Radius
|
Tolerance
|
Area Reduction (Nominal)
|
Strand Thickness
|
Width<.189"
|
Width≥.189"
|
|
Width<.189"
|
Width≥.189"
|
Under 0.064" (0.163mm)
|
T/2
|
T/2
|
± 25%
|
0.2146T² in²
|
0.2146T² in²
|
0.064 - 0.089" (2.26mm)
|
0.020" (0.51mm)
|
0.031" (0.8mm)
|
± 25%
|
0.000343 in²
|
0.000825 in²
|
0.089 - 0.13" (3.3mm)
|
0.026" (0.66mm)
|
0.031" (0.8mm)
|
± 25%
|
0.000580 in²
|
0.000825 in²
|
IEC Corner Radii
| Strand Thickness |
Corner Radius
|
Tolerance
|
Area Reduction (Nominal)
|
≤ 1.00mm (0.394”)
|
T/2
|
± 25%
|
0.2146T² in²
|
1.00 ≤ 1.60mm (0.063”)
|
0.5mm
|
± 25%
|
0.2146 mm²
|
1.60 ≤ 2.24mm (0.088”)
|
0.65mm
|
± 25%
|
0.3627 mm²
|
2.24 ≤ 3.30mm (0.13”)
|
0.8mm
|
± 25%
|
0.5494 mm²
|