How Much Does an Arc Flash Study Cost?

Arc flash study cost depends primarily on how large and complex the electrical system is, how much usable documentation already exists, and how much field time the engineer needs to collect data. A small commercial building can be completed for a few thousand dollars. A large manufacturing plant or industrial campus can run $25,000 to $75,000 or more.

Most facilities fall somewhere in between. The number that matters most is not the total study cost but the cost per bus, or per panel. That is how engineers typically price the work, and it is the clearest way to benchmark whether a quote is reasonable for what you have.

The arc flash study is a sequence of engineering analyses: short circuit study, coordination study, and arc flash calculations under IEEE 1584. Each of those has an associated cost. They are usually quoted as a single engagement because they share the same system model and the same field data.

Cost ranges by facility type

These ranges assume the engineering firm handles data collection, modeling, analysis, and reporting. They do not account for situations where the facility has no current one-line diagram, outdated equipment records, or equipment that requires special access. Those conditions add cost.

What drives arc flash study cost

Number of buses and panels

This is the primary driver. Engineers price most studies by the number of buses or panel positions included in the study scope. More buses means more field data to collect, more equipment to model, and more arc flash calculations to run. Getting an accurate count of your buses and MCC sections before requesting quotes helps you compare proposals correctly.

Data availability

Facilities with current, accurate one-line diagrams and organized equipment records cost less to study than facilities starting from scratch. The engineer does not need to trace circuits, verify panel schedules, or rebuild the system model from field observations alone. Facilities with poor documentation can add two to three days of field time before engineering work even begins.

Equipment age and condition

Older equipment with worn or missing nameplates requires more time to document. Nameplates that are unreadable have to be researched through serial number lookups with the manufacturer, estimated from remaining information, or photographed with additional equipment and lighting. Each of those adds time.

Facility complexity and voltage levels

Medium-voltage systems (4160V, 13.8kV, and higher) require more complex modeling and protective device coordination analysis than 480V systems. Relay-based protection at medium voltage adds time for settings collection and coordination plot development. Facilities with generators, cogeneration, or multiple utility tie points add additional modeling complexity.

Geographic location and travel

Engineering firms typically bill travel time and expenses on top of study fees. A facility two hours from the engineer's office adds four hours of travel time per site visit, plus mileage, hotel, and meals if an overnight stay is required. Remote or rural facilities can add thousands of dollars in travel costs to an otherwise mid-size study budget.

What is included in an arc flash study

A full-scope arc flash study engagement typically covers:

• Site walkdown and field data collection for all in-scope equipment
• One-line diagram development or update to reflect actual installed conditions
• Short circuit study: available fault current at each bus and equipment interrupting rating check
• Protective device coordination study: time-current curve analysis confirming selective coordination
• Arc flash calculations under IEEE 1584 for each in-scope bus
• Equipment label generation with incident energy, arc flash boundary, and PPE category
• Final study report with methodology, assumptions, results, and recommendations

Some firms include label installation in the scope. Others deliver label stock for facility staff to install. Equipment label installation across a large facility can itself be a significant labor cost that should be budgeted separately if not included.

Data collection as the primary cost driver

On facilities without current documentation, field data collection is the largest single line item in the study cost. The engineer or a field technician walks every location, photographs nameplates, reads breaker settings, measures cables, and records panel schedule information. On a large facility, this takes multiple days of field time at engineering billing rates.

This is where facilities can directly influence study cost. The more organized and accessible the equipment documentation, the less field time the engineer needs. Facilities that maintain current one-line diagrams, organized panel schedules, and equipment records can cut data collection time significantly.

70Ez addresses this directly. Field technicians photograph equipment and the AI reads the nameplate data, reducing the time spent hand-writing or transcribing from dirty nameplates. The structured export to SKM PowerTools, ETAP, or EasyPower means the engineer spends less time entering data and more time on the analysis itself. See how arc flash data collection works for a detailed walkthrough.

Download the free arc flash field data collection checklist to see exactly what data points are needed by equipment type. Having this data organized before the engineer arrives can reduce site visit time.

The cost of not doing the study

OSHA cites employers for failure to assess electrical hazards and provide appropriate PPE. OSHA 1910.132 and 1910.269 both require hazard assessment before electrical work. Violations can result in citations with penalties up to $16,131 per violation for serious violations and $161,323 for willful or repeated violations under current penalty schedules.

The liability exposure from a worker arc flash injury at a facility with no study is far larger than any study cost. Workers' compensation claims, litigation, regulatory investigation, and facility downtime from a serious incident routinely exceed the cost of the most expensive industrial arc flash studies.

The NFPA 70E 2027 requirement for arc flash risk assessment under Section 130.5 applies to any work on energized equipment at 50 volts or above. That covers virtually every electrical task beyond changing a fuse in a 120V circuit.

Factoring in the five-year recurrence

NFPA 70E recommends reviewing arc flash studies at intervals not exceeding five years. Factor that into your total cost of ownership. A study that costs $12,000 today will need to be updated in five years. If your electrical system changes significantly before then, an earlier update may be required.

Update studies are typically less expensive than initial studies if the system model is maintained and documentation stays current. Engineers can update an existing model rather than building from scratch. Facilities that keep their one-line diagrams current and document equipment changes as they happen pay less for update studies.

Some engineering firms offer annual maintenance contracts that include minor model updates and a full study refresh at the five-year mark. For facilities with frequent system changes, these can be cost-effective.

How 70Ez affects study cost

70Ez is a field data collection tool. It does not perform the engineering analysis. What it does is reduce the time between field work and analysis by eliminating the manual transcription step that typically follows site collection.

When a field technician photographs a transformer nameplate and 70Ez reads the impedance, kVA, and voltage data automatically, that is data that does not need to be hand-written and then re-keyed into power system analysis software. On a study with 50 transformers and 200 breakers, that adds up to hours of saved time. Saved time is saved cost. See how the arc flash analysis process works and where data collection fits into the total timeline.