RP0177-2000
NACE International 9
Figure 3 — Allowable short circuit currents for insulated copper conductors.
Reprinted with permission from Insulated Cable Engineers Association (ICEA). Publication P-32-382, copyright 1994.
____________________________
(A)
To calculate this formula using metric units, change A to metric values as indicated in Table A1, Appendix A.
I = Short circuit current in amperes
A = Conductor area in circular mils
t = Time of short circuit in seconds
T
1
= Maximum operating temperature
of 90
q
q
C
T
2
= Maximum short circuit temperature
of 250
q
q
C
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