Maximum frequency for 100% skin depth for solid conductor copper
Breaking force Soft Annealed Cu 37000 PSI
6
0.162
4.1148
0.3951
1.295928
101
37
1100Hz
760 lbs
8
0.1285
3.2639
0.6282
2.060496
73
24
1650 Hz
480 lbs
10
0.1019
2.58826
0.9989
3.276392
55
15
2600 Hz
314 lbs
12
0.0808
2.05232
1.588
5.20864
41
9.3
4150 Hz
197 lbs
Designation Letter
Meaning
S
Indicates a flexible cord designed for general use
W
Indicates the cord is rated for outdoor use
J
Indicates the cord with standard 300 voltage insulation. If there is no J in the designation, the cord has thicker, 600-volt insulation, designed for heavier use.
P
Indicates parallel wire construction, used in air conditioner cords and household extension cords
T
Indicates the cord jacket is made from vinyl thermoplastic
E
Indicates the cord jacket is made from thermoplastic elastomer rubber (TPE)