Cross Sectional Area

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