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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:

Arc Flash Hazard Calculations Procedure and Considerations For Medium Voltage System 

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

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

Arcing Current Variation Correction Factor Equation

Arcing Current Variation Correction Factor Equation

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

Verify results and send feedback if a discrepancy is found.

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