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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

Where:

I_{aoc_Voc} = Average RMS arcing current at the voltage level
I_bf = 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.