Tables > Conductors > Short Circuits > "C" Values
"C" values for conductors for use in short-circuit calculations
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AWG or MCM |
| Copper |
Copper |
| Three Single Conductors |
Three Conductor Cable |
| Steel Conduit |
Nonmagnetic Conduit |
Steel Conduit |
Nonmagnetic Conduit |
| 600V |
5KV |
15KV |
600V |
5KV |
15KV |
600V |
5KV |
15KV |
600V |
5KV |
15KV |
| 12 | 617 | 617 | 617 | 617 | 617 | 617 | 617 | 617 | 617 | 617 | 617 | 617 | | 10 | 981 | 981 | 981 | 981 | 981 | 981 | 981 | 981 | 981 | 981 | 981 | 981 | | 8 | 1557 | 1551 | 1557 | 1558 | 1555 | 1558 | 1559 | 1557 | 1559 | 1559 | 1558 | 1559 | | 6 | 2425 | 2406 | 2389 | 2430 | 2417 | 2406 | 2431 | 2424 | 2414 | 2433 | 2428 | 2420 | | 4 | 3806 | 3750 | 3695 | 3825 | 3789 | 3752 | 3830 | 3811 | 3778 | 3837 | 3823 | 3798 | | 3 | 4760 | 4760 | 4760 | 4802 | 4802 | 4802 | 4760 | 4790 | 4760 | 4802 | 4802 | 4802 | | 2 | 5906 | 5736 | 5574 | 6044 | 5926 | 5809 | 5989 | 5929 | 5827 | 6087 | 6022 | 5957 | | 1 | 7292 | 7029 | 6758 | 7493 | 7306 | 7108 | 7454 | 7364 | 7188 | 7579 | 7507 | 7364 | | 1/0 | 8924 | 8543 | 7973 | 9317 | 9033 | 8590 | 9209 | 9086 | 8707 | 9472 | 9372 | 9052 | | 2/0 | 10755 | 10061 | 9389 | 11423 | 10877 | 10318 | 11244 | 11045 | 10500 | 11703 | 11528 | 11052 | | 3/0 | 12843 | 11804 | 11021 | 13923 | 13048 | 12360 | 13656 | 13333 | 12613 | 14410 | 14118 | 13461 | | 4/0 | 15082 | 13605 | 12542 | 16673 | 15351 | 14347 | 16391 | 15890 | 14813 | 17482 | 17019 | 16012 | | 250 | 16483 | 14924 | 13643 | 18593 | 17120 | 15865 | 18310 | 17850 | 16465 | 19779 | 19352 | 18001 | | 300 | 18176 | 16292 | 14768 | 20867 | 18975 | 17408 | 20617 | 20051 | 18318 | 22524 | 21938 | 20163 | | 350 | 19703 | 17385 | 15678 | 22736 | 20526 | 18672 | 22646 | 21914 | 19821 | 24904 | 24126 | 21982 | | 400 | 20565 | 18235 | 16365 | 24296 | 21786 | 19731 | 24253 | 23371 | 21042 | 26915 | 26044 | 23517 | | 500 | 22185 | 19172 | 17492 | 26706 | 23277 | 21329 | 26980 | 25449 | 23125 | 30028 | 28712 | 25916 | | 600 | 22965 | 20567 | 17962 | 28033 | 25203 | 22097 | 28752 | 27974 | 24896 | 32236 | 31258 | 27766 | | 750 | 24136 | 21386 | 18888 | 28803 | 25430 | 22690 | 31050 | 30024 | 26932 | 32404 | 31338 | 28303 | | 1000 | 25278 | 22539 | 19923 | 31490 | 28083 | 24887 | 33864 | 32688 | 29320 | 37197 | 35748 | 31959 |
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