Arc Flash Calculation Software

Arc Flash Calculator

This tool provides a screening estimate. It is not a substitute for a certified arc flash study.

Project name

Equipment ID

System voltage (V)

Bolted fault current (kA)

Normal clearing time (ms)

Reduced current clearing time (ms)

Frequency (Hz)

Working distance (mm)

Conductor gap (mm)

Enclosure width (mm)

Enclosure height (mm)

Enclosure depth (mm)

Electrode configuration

Enclosure type

Grounding method

Equipment class

Study notes

Example Data Table

Equipment	Voltage	Fault Current	Clearing Time	Distance	Typical Use
Panel PB-1	208 V	10 kA	80 ms	455 mm	Branch panel review
MCC-2	480 V	22 kA	120 ms	455 mm	Motor control center
SWBD-1	480 V	35 kA	180 ms	610 mm	Main switchboard
MV-3	4160 V	18 kA	250 ms	914 mm	Medium voltage gear

Formula Used

This page uses a simplified screening model. It does not reproduce the full published engineering standard.

Arcing current: Iarc = Ibf x voltage factor x gap factor x electrode factor x grounding factor.

Incident energy: E = 0.004 x V x Iarc x time x incident factor / (D / 610)^x.

Reduced current case: Iarc reduced = 0.85 x Iarc. The final energy is the larger of the normal and reduced current cases.

Boundary: AFB = D x (E / 1.2)^{1 / x}. The boundary estimates the distance where energy reaches 1.2 cal/cm2.

How to Use This Calculator

Enter the project and equipment name.
Add system voltage and available bolted fault current.
Enter normal and reduced current clearing times.
Set working distance, conductor gap, and enclosure dimensions.
Select electrode, enclosure, grounding, and equipment options.
Press Calculate to view the result below the header.
Use CSV or PDF buttons to save the current case.
Ask a qualified professional to validate final labels.

Arc Flash Calculation Software Overview

Arc flash work needs careful planning. This software gives a structured estimate for incident energy, arc flash boundary, and practical review notes. It accepts voltage, fault current, clearing time, conductor gap, enclosure size, electrode style, grounding, and working distance. These inputs help teams compare conditions before a formal study. The result is designed for screening, planning, and documentation support.

Why Arc Flash Estimates Matter

An arc flash can release heat, pressure, light, and molten metal. The danger changes quickly when distance, current, and clearing time change. A small reduction in protective device clearing time can lower energy greatly. A larger working distance can also reduce exposure. That is why the calculator separates each important field. Users can see which factor drives the final result.

Advanced Input Control

The form includes normal and reduced arcing current timing. This is useful because a lower arcing current may trip a device more slowly. The software also includes enclosure and electrode options. These choices do not replace laboratory based equations. They help create a conservative planning estimate when exact study data is not available.

Reading the Output

The result table shows estimated arcing current, reduced arcing current, incident energy, final selected energy, arc flash boundary, and PPE range. The final selected energy uses the larger value from the normal and reduced current cases. This helps avoid choosing a result that looks safe only because one scenario was ignored.

Engineering Use

Use this tool for early review, training examples, and quote preparation. Do not use it as the only basis for energized work. Real studies require verified one line diagrams, utility fault data, transformer details, cable data, protective device curves, labels, and field validation. A qualified electrical professional should approve the final report.

Good Safety Practice

Better design can reduce exposure. Consider remote switching, maintenance settings, faster protection, current limiting devices, and de energizing when possible. Keep equipment labels current. Review settings after system changes. Use arc rated personal protective equipment only when it matches the approved study and work task. Keep assumptions visible for every saved case. Clear records help reviewers find weak inputs, compare revisions, and explain why a boundary changed before labels are printed for field equipment.

FAQs

Is this a certified arc flash study?

No. It is a screening calculator. A certified study needs verified electrical data, protective device curves, equipment details, and approval from a qualified electrical professional.

What is incident energy?

Incident energy is the heat energy expected at a working distance during an arc flash event. It is commonly expressed in cal/cm2.

Why does clearing time matter?

Longer clearing time lets the arc release energy for more time. Faster protection can greatly reduce the estimated exposure.

Why is reduced arcing current included?

A lower arcing current can make a protective device trip more slowly. The calculator checks that case and selects the higher energy.

What is the arc flash boundary?

It is the estimated distance where incident energy falls to 1.2 cal/cm2. Workers inside that distance need task specific protection.

Can I use the PPE range directly?

Use it only for early review. Actual PPE selection must follow the approved study, employer policy, electrical standard, and task conditions.

What units are used?

Voltage is entered in volts. Fault current is entered in kiloamps. Time is entered in milliseconds. Distance and enclosure dimensions are entered in millimeters.

Why do enclosure choices change the output?

Enclosures can focus arc energy toward a worker. The screening model adjusts energy for open, standard, shallow, and deep equipment cases.