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Interpolation Arcing Current Equations and Calculator

Electrical and Electronics Design and Engineering

Interpolation Equations and Calculator for Arcing Current per IEEE 1584-2018

Reduced Final Arcing Current Equations and Calculator

Related:

Arc Flash Hazard Calculations Procedure and Considerations For Medium Voltage System 

To determine the final arcing current, incident energy, and arc-flash boundary at a specific voltage, first calculate the intermediate values for the three voltage levels of 600 V, 2700 V, and 14 300 V. Then use the interpolation IEEE 1584-2018 Equation (16) to Equation (18) to determine the final estimated values as follows:

Preview: Interpolation Equations and Calculator for Arcing Current per IEEE 1584-2018

Interpolation Equations for Arcing Current (I_arc)

Where:

I_{arc_1} = First Iarc interpolation term between 600 V and 2700 V (kA)
I_{arc_2} = Second Iarc interpolation term used when Voc is greater than 2700 V (kA)
I_{arc_3} = Third Iarc interpolation term used when Voc is less than 2700 V (kA)
Voc = Open-circuit voltage (system voltage) (kV)

When 0.6< Voc ≤ 2.7kV, the final value of arcing current is given as follows:
I_arc = I_{arc_3}

When Voc > 2.7kV, the final value of arcing current is given as follows:
I_arc = I_{arc_2}

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

Reference:

IEEE 1584-2018

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