Arc flash calculator
I-estimate ang enerhiya ng arc flash at ang PPE category nito.
Reads IEEE 1584-2002 and 2018. Tables checked 1 Oct 2026.
Subukan ang isang job 7
Nilalagyan ng halimbawang value ang bawat job. Palitan ang mga ito ng sarili mong value.
- Estimate arc flash energy at an MCCThe incident energy at 455 mm from a 25 kA MCC, cleared in 0.15 s.
- Estimate arc flash at a main switchboardThe incident energy at 40 kA cleared in 0.3 s.
- Estimate arc flash at a distribution boardThe incident energy at 10 kA cleared in 0.1 s.
- Estimate arc flash in open airThe incident energy with no enclosure.
- Estimate arc flash at 11 kV switchgearThe incident energy at 11 kV and 12 kA.
- Find the boundary at a longer reachThe incident energy and arc flash boundary at a 600 mm working distance.
- Compare a faster clearing timeThe incident energy of a 25 kA fault cleared in 0.05 s.
Mga input
Worked example gamit ang mga default na input.
- Model
- IEEE 1584-2018
- System voltage
- 0.4 kV
- Bolted fault current
- 20 kA
- Clearing time
- 0.2 s
- Oras ng clearing sa nabawasang current
- 0 s
- Kagamitan
- Switchgear
- Configuration ng electrode
- VCB: vertical conductors sa loob ng box
- Electrode gap
- 0 mm
- Taas ng enclosure
- 0 mm
- Lapad ng enclosure
- 0 mm
- Lalim ng enclosure
- 0 mm
- Working distance
- 455 mm
Incident energy
7.01cal/cm²
- Arcing current
- 13.64kA
- Nabawasang arcing current
- 11.9kA
- Arc flash boundary
- 1,373.09mm
- PPE category
- 2
Design aid lang ang resultang ito. I-verify ito laban sa kasalukuyang standard.
Mga hakbang ng kalkulasyon
- ModeloIEEE 1584-2018
IEEE 1584-2018 Cl 4
- Arcing current sa 600 V16.27kA
IEEE 1584-2018 Cl 4
- Configuration ng electrodeVCB
IEEE 1584-2018 Cl 4
- Agwat ng electrode32mm
IEEE 1584-2018 Cl 4
- Arcing current13.64kA
IEEE 1584-2018 Cl 4
- Katumbas na laki ng enclosure20
IEEE 1584-2018 Cl 4
- Correction factor ng laki ng enclosure×1.00
IEEE 1584-2018 Cl 4
- Incident energy sa buong arcing current7.01cal/cm²
IEEE 1584-2018 Cl 4
- Variation factor ng arcing current0.26
IEEE 1584-2018 Cl 4
- Binawasang arcing current11.9kA
IEEE 1584-2018 Cl 4
- Incident energy sa nabawasang arcing current6.15cal/cm²
IEEE 1584-2018 Cl 4
- Incident energy, ang mas mataas na passResulta7.01cal/cm²
IEEE 1584-2018 Cl 4
- Arc flash boundary, ang mas mataas na pass1,373.09mm
IEEE 1584-2018 Cl 4
Tungkol sa calculator na ito
How this is calculated
The tool estimates the incident energy of an arcing fault. It uses the IEEE 1584-2018 model. It can also run the 2002 model for older studies. IEEE 1584 is not an AS/NZS Standard, so the steps cite its clause only.
- Model. You pick the 2018 or the 2002 model. The 2018 model asks for the electrode configuration and the equipment. The 2002 model asks if the equipment is enclosed and earthed (Cl 4).
- Arcing current. The tool finds the arcing current at 600 V. It then corrects it to your voltage for the electrode gap.
- Enclosure. It works the equivalent enclosure size. It applies the enclosure size correction factor.
- Incident energy. It works the incident energy at the full arcing current. It uses your clearing time and working distance.
- Reduced current. It applies an arcing current variation factor. It works the incident energy again at that lower current.
- Result. The tool keeps the higher of the two passes. It gives the arc flash boundary and the PPE category.
| Step | Table or clause | What it decides |
|---|---|---|
| Arcing current | IEEE 1584-2018 Cl 4 | The current at your voltage and gap |
| Enclosure correction | IEEE 1584-2018 Cl 4 | The effect of the box size |
| Incident energy and boundary | IEEE 1584-2018 Cl 4 | The energy and the distance for the higher pass |
Worked example
- 400 V switchgear with a 20 kA bolted fault and a 0.2 s clearing time. The working distance is 455 mm. The tool gives an arcing current of 13.64 kA and an incident energy of 7.01 cal/cm². The boundary is 1,373.09 mm. The PPE category is 2.
Limits
- The 2018 model covers 208 V to 15 kV. Above 15 kV the tool uses the Lee model, which is a different method.
- The reduced current pass uses the same clearing time. Enter its own time from the device curve.
- The tool takes your bolted fault current and clearing time as given. Get them from a fault level study and the device curve.
- The result is an estimate. It is not a label and it is not a safe-work permit.
See also: Arc flash basics, Incident energy at a 400 V switchboard and Arc flash label for a commercial main switchboard.
Mga tanong
Design aid ang resulta. I-verify ito laban sa kasalukuyang standard.
Ano ang ginagawa ng arc flash calculator?
Tinatantiya ng tool ang arcing current, pagkatapos ang arc flash boundary. Tinatantiya rin nito ang incident energy sa working distance mo, at iniuulat ang PPE category para sa energy na iyon. Ipinapakita ng mga hakbang ang bawat value na ginamit ng model.
Aling model ang ginagamit nito?
Gumagamit ng IEEE 1584-2018 model ang bagong page. Piliin ang 2002 para tumugma sa mas lumang pag-aaral. Ang link o save na ginawa bago ang 2018 model ay bumabasa bilang 2002, kaya hindi nagbabago ang resulta nito. Kapag higit sa 15 kV, walang nalalapat na model, kaya gumagamit ang tool ng Lee method at sinasabi ito.
Aling mga input ang pinakamahalaga?
Ang bolted fault current at ang clearing time ang pangunahing nagtatakda ng incident energy. Mahalaga rin ang working distance, na default na 455 mm. Sa 2018 model, binabago ng electrode configuration at laki ng enclosure ang energy. Ang VCB, vertical conductors in a box, ang karaniwang kaso sa switchboard. Sa 2002 model, mahalaga ang mga setting na enclosed at earthed.
Bakit tumatakbo nang dalawang beses ang 2018 model?
Nag-iiba ang arcing current sa bawat test. Kaya tumatakbo rin ang tool sa nabawasang arcing current, na maaaring magdulot ng mas mabagal na trip ng device. Iniuulat nito ang mas mataas na energy at ang mas malaking boundary. Ilagay ang clearing time sa nabawasang current kung iba ang oras na ibinibigay ng device curve mo.
Paano pinipili ang PPE category?
Itinatakda ng tool ang category mula sa incident energy. Ang mga gilid ng band na ginagamit nito ay 1.2, 4, 8, 25 at 40 calories kada square centimetre. Kapag higit sa 40, iniuulat ang resulta bilang higit sa category 4. Nasa page address ang mga input, kaya muling nagagawa ng link ang study case.
Mga worked example
- IEEE 1584-2002: arc flash model and limitsWhat the IEEE 1584-2002 empirical model governs, where it stops applying, and a 400 V switchboard study that lands on 7.54 cal/cm² at 455 mm.
- Arc flash at a 48 V home batteryClass a 48 V lithium home battery with 6 kA at its terminals by AS/NZS 5139, find its arc flash energy and PPE level, then bring it down with fuses.
- Arc flash boundary at a motor control centreArcing current, incident energy and arc flash boundary for a 400 V MCC at 25 kA with a 0.1 s clearing time, and why the equipment type moves the result.
- Arc flash incident energy at a 400 V switchboardA 400 V board with 20 kA bolted fault and 0.2 s clearing gives 6.23 cal/cm² at 455 mm, an arcing current of 9.64 kA and a 1395.97 mm boundary.
Background
- Battery classes and arc flash in AS/NZS 5139How AS/NZS 5139 classes a battery system by hazard and decisive voltage class, works its arc flash energy, and sets the PPE, consequence and home limits.
- Arc flash basicsArcing current, incident energy, boundary and working distance explained, with three engine runs that show clearing time beating fault current every time.
Mga clause at table na binabasa ng tool na ito
- IEEE 1584-2018 Cl 4Arc flash incident energy, 2018 model
- IEEE 1584-2002 Cl 5Arc flash incident energy
- IEEE 1584-2018 Table 1Coefficients for the intermediate average arcing current
- IEEE 1584-2018 Table 2Coefficients for the arcing current variation correction factor
- IEEE 1584-2018 Table 7Enclosure size correction factor coefficients
- IEEE 1584-2018 Tables 3 to 5Coefficients for the intermediate incident energy and arc-flash boundary
- IEEE 1584-2018 Tables 8 and 10Typical bus gaps, enclosure sizes and working distances by equipment class
- IEEE 1584-2002 Cl 5.2–5.6Arc flash incident energy model coefficients
Bawat clause at table, kasama kung paano ito na-verify
Huling na-check ang mga table noong 1 Oct 2026.
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