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### Arcing Current Variation Correction Factor Equation and Calculator per IEEE 1584-2018

Electrical and Electronics Design and Engineering

Arcing Current Variation Correction Factor Equation and Calculator per IEEE 1584-2018

This calculator and equation will determine the arcing current at the open circuit voltage. Requires premium membership account to access calculator.

Related:

NOTE:

• Values calculated on the is page are applicable only when Voc ( open-circuit voltage) is between 600 V and 15,000 V. Iarc_600, Iarc_2700, and Iarc_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  Where:

VarCf is the arcing current variation correction factor
Iarc is the final or intermediate rms arcing current(s) (kA) (see note)
Iarc_min is a second rms arcing current reduced based on the variation correction factor (kA)
Voc is the open-circuit 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 1.138e-06 −6.0287e-05 0.0012758 −0.013778 0.080217 −0.24066 0.33524 HCB 0 −3.097e-06 0.00016405 −0.0033609 0.033308 −0.16182 0.34627 VOA 9.5606E-07 −5.1543E-05 0.0011161 −0.01242 0.075125 −0.23584 0.33696 HOA 0 −3.1555e-06 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 lower-bound value arcing current.

Reference:

IEEE 1584-2018

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