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Intermediate Average Arcing Current Equation and Calculator per IEEE 1584-2018

Electrical and Electronics Design and Engineering

Intermediate Average Arcing Currents 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 

Preview: Intermediate Average Arcing Currents Calculator per IEEE 1584-2018

Intermediate Average Arcing Currents Equation

Where:

Iaoc_Voc = Average RMS arcing current at the voltage level
Ibf = Bolted fault current for three-phase faults (symmetrical rms) (kA)
G = Conductor gap distance between electrodes (mm)
k1 to k10 = coefficients provided in Table A given below
lg = log10

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 A - Coefficients for Equation

E.C. / Voc
k1
k2
k3
k4
k5
k6
k7
k8
k9
k10
VCB
600 V
−0.04287
1.035
−0.083
0
0
−4.783E-09
1.962E-06
−0.000229
0.003141
1.092
2700 V
0.0065
1.001
−0.024
−1.557E-12
4.556E-10
−4.186E-08
8.346E-07
5.482E-05
−0.003191
0.9729
14300 V
0.005795
1.015
−0.011
−1.557E-12
4.556E-10
−4.186E-08
8.346E-07
5.482E-05
−0.003191
0.9729
VCBB
600 V
−0.017432
0.98
−0.05
0
0
−5.767E-09
2.524E-06
−0.00034
0.01187
1.013
2700 V
0.002823
0.995
−0.0125
0
−9.204E-11
2.901E-08
−3.262E-06
0.0001569
−0.004003
0.9825
14300 V
0.014827
1.01
−0.01
0
−9.204E-11
2.901E-08
−3.262E-06
0.0001569
−0.004003
0.9825
HCB
600 V
0.054922
0.988
−0.11
0
0
−5.382E-09
2.316E-06
−0.000302
0.0091
0.9725
2700 V
0.001011
1.003
−0.0249
0
0
4.859E-10
−1.814E-07
−9.128E-06
−0.0007
0.9881
14300 V
0.008693
0.999
−0.02
0
−5.043E-11
2.233E-08
−3.046E-06
0.000116
−0.001145
0.9839
VOA
600 V
0.043785
1.04
−0.18
0
0
−4.783E-09
1.962E-06
−0.000229
0.003141
1.092
2700 V
−0.02395
1.006
−0.0188
−1.557E-12
4.556E-10
−4.186E-08
8.346E-07
5.482E-05
−0.003191
0.9729
14300 V
0.005371
1.0102
−0.029
−1.557E-12
4.556E-10
−4.186E-08
8.346E-07
5.482E-05
−0.003191
0.9729
HOA
600 V
0.111147
1.008
−0.24
0
0
−3.895E-09
1.641E-06
−0.000197
0.002615
1.1
2700 V
0.000435
1.006
−0.038
0
0
7.859E-10
−1.914E-07
−9.128E-06
−0.0007
0.9981
14300 V
0.000904
0.999
−0.02
0
0
7.859E-10
−1.914E-07
−9.128E-06
−0.0007
0.9981

 

Reference:

IEEE 1584-2018

Verify results and send feedback if a discrepancy is found.

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