SPEC F125
January, 2008
Short Circuit Currents
Allowable Short Circuit Currents For Thermoset Insulated Aluminum Conductors Rated For 105°C Maximum Continuous Operation 1000000
Short Circuit Current—Amperes
100000
10000
Curves Based on the Formula 1000 2
[ ] t = 0.0125 log [ TT ++ 228 228 ] I A
2
10
1
I = Short Circuit Current–Amperes A = Conductor Area–Circular Mils t = Time of Short Circuit–Seconds T1 = Maximum Operating Temperature–105°C T2 = Maximum Short Circuit Temperature–250°C
100
10
8
6
4
2
1
1/0 2/0 3/0 4/0 250
350
500
750 1000
Conductor Size (AWG/kcmil) 1 Cycles 16 Cycles
2 Cycles 30 Cycles
4 Cycles 60 Cycles
8 Cycles 100 Cycles
Reprinted with permission from ICEA P-32-382 Short Circuit characteristics of Insulated Conductors, Copyright 2006, Insulated Cable Engineers Association, Carrollton, GA 30112. This reprint is not the referenced subject, which is represented only by the standard in its entirety. Phone: 888-593-3355 www.generalcable.com