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Arcing Current Variation Correction Factor Equation and Calculator per IEEE 15842018
Electrical and Electronics Design and Engineering
Arcing Current Variation Correction Factor Equation and Calculator per IEEE 15842018
This calculator and equation will determine the arcing current at the open circuit voltage. Requires premium membership account to access calculator.
Related:
Arc Flash Hazard Calculations Procedure and Considerations For Medium Voltage System
NOTE:
 Values calculated on the is page are applicable only when V_{oc} ( opencircuit voltage) is between 600 V and 15,000 V. I_{arc_600}, I_{arc_2700}, and I_{arc_14300} (intermediate average arcing currents). The final Iarc value inherits the correction factor.
 When 208 V ≤ Voc ≤ 600 V: To Iarc (final current only). See: Interpolation Arcing Current Equations and Calculator
Preview: Arcing Current Variation Correction Factor Equation and Calculator per IEEE 15842018
Where:
VarC_{f} is the arcing current variation correction factor
I_{arc} is the final or intermediate rms arcing current(s) (kA) (see note)
I_{arc_min} is a second rms arcing current reduced based on the variation correction factor (kA)
V_{oc} is the opencircuit voltage between 208 kV and 15.0 kV
k1 to k10 = coefficients provided in Table B given below
VCB: Vertical conductors/electrodes inside a metal box/enclosure
VCBB: Vertical conductors/electrodes terminated in an insulating barrier inside a metal box/enclosure
HCB: Horizontal conductors/electrodes inside a metal box/enclosure
VOA: Vertical conductors/electrodes in open air
HOA: Horizontal conductors/electrodes in open air
Table B  Coefficients for Equation
E.C.

k1

k2

k3

k4

k5

k6

k7

VCB

0

−0.0000014269

0.000083137

−0.0019382

0.022366

−0.12645

0.30226

VCBB

1.138e06

−6.0287e05

0.0012758

−0.013778

0.080217

−0.24066

0.33524

HCB

0

−3.097e06

0.00016405

−0.0033609

0.033308

−0.16182

0.34627

VOA

9.5606E07

−5.1543E05

0.0011161

−0.01242

0.075125

−0.23584

0.33696

HOA

0

−3.1555e06

0.0001682

−0.0034607

0.034124

−0.1599

0.34629

NOTE:
The correction factor (1 – (0.5 × VarCf )) is applied as follows:
 208 V ≤ Voc ≤ 600 V: To Iarc (final current only)
 600 V < Voc ≤ 15 000 V: To Iarc @ 600, Iarc @ 2700, and Iarc @ 14300 (intermediate average arcing currents). The final Iarc value inherits the correction factor.
The “0.5” coefficient indicates that variation is applied to the average arcing current to obtain a lowerbound value arcing current.
Reference:
IEEE 15842018
Verify results and send feedback if a discrepancy is found.