Arc Flash Risk Assessment for Paper Machinery: Turning an Electrical Hazard into a Documented Programme, 2026 Guide
In April 2025, Piotr Zielinski, plant electrician at a paper converting site near Wroclaw, Poland, opened a motor control centre door to take a reading and stepped back from a flash that scorched the panel interior and his gloves. He was not injured, but the near miss triggered an audit that found no arc flash labels on any of the plant's switchgear, no documented incident energy study, and no written safe work practice beyond the general rule to wear gloves. The first response was to buy heavier gloves. The turning point came when the audit showed the plant could not state the incident energy at the panel the electrician had opened, so no glove specification could be correct. The hazard had never been quantified, and protective equipment chosen without a study is a guess dressed as a procedure.
Why Paper Plants Carry Arc Flash Risk
Arc flash is an electrical fault that produces a burst of energy in the form of heat, light, and pressure. It occurs when insulation fails or when a conductive object bridges a live conductor, and the energy released depends on the available fault current and the duration of the fault before it is cleared.
Paper facilities carry this risk because they run large motors, long cable runs, and switchgear that operates at voltages and fault levels where an incident can be severe. The environment adds moisture and dust, which degrade insulation and create tracking paths, and the process adds continuous demand, which means the electrical system is rarely taken out of service for the convenience of an inspection.
The hazard is not limited to high voltage. Most arc flash incidents in industrial plants occur at low voltage, because low voltage equipment is where people work the most and where the shock hazard is often the only one considered.
What a Risk Assessment Produces
An arc flash risk assessment is not a document; it is a set of outputs that change how work is done.
| Output | What it contains | How it is used |
|---|---|---|
| Incident energy study | Calculated energy at each point | Sets the arc-rated clothing and PPE |
| Equipment labels | Energy and boundary at the panel | Tells the worker what is required before opening |
| Safe work practices | Procedures for live and de-energised work | Defines what is permitted and how |
| Job safety plan | Task-specific hazard review | Done before the task, not after |
| Training records | Qualified person status | Proves the worker knows the hazard |
A plant that has labels but no study has decoration. A plant that has a study but no safe work practice has data it does not use. The outputs have to arrive together.
NFPA 70E, the Standard for Electrical Safety in the Workplace, provides the framework that many industrial plants use for electrical safety programmes, including arc flash risk assessment, equipment labelling, and the selection of arc-rated protective equipment. The 2024 edition continues the shift from a purely prescriptive approach to one built on risk assessment and documented safe work practices, which is why a plant's programme is judged by what it can show rather than by what it owns.
Incident Energy Studies and Labeling
An incident energy study calculates the energy that would be released at each point in the electrical system under a fault, using the available fault current and the clearing time of the protective device. The result is expressed as incident energy at a working distance, and it determines the arc rating that protective clothing must have.
The study is only as good as its inputs. The available fault current must reflect the actual utility supply, not a value from an old drawing. The clearing time must reflect the protective device that will actually operate, including the settings that are in service rather than the settings that were specified. And the study must be updated when the system changes, because adding a transformer or changing a relay setting can move the energy at every downstream point.
Labels follow the study, and they belong on the equipment where a worker will see them before opening a door: incident energy, arc flash boundary, and the required protective equipment. A label that sits in a binder rather than on the panel changes nothing at the moment of the incident.
IEEE 1584, Guide for Performing Arc-Flash Hazard Calculations, provides the calculation methods that underpin published incident energy studies, including the treatment of system voltage, available fault current, and protective device clearing time. A study that cites a recognised calculation method can be reviewed and reproduced, while a study produced by an undocumented spreadsheet cannot, and the difference matters when an incident is investigated and the programme is tested.
Safe Work Practices and PPE
Arc-rated protective equipment is the last line of defence, not the first. The order that works begins with de-energising the equipment and verifying the absence of voltage, because a task done on dead equipment cannot produce an arc flash.
Where live work is unavoidable, the programme has to define it rather than leave it to the individual. That means an energised work permit, an approach boundary that is respected, a shock risk assessment as well as an arc flash risk assessment, and protective equipment matched to the incident energy at that specific point.
The shock hazard is the partner of the arc flash hazard, and programmes that address only one are half-built. Approach boundaries, insulated tools, and voltage-rated gloves address the shock side, while arc-rated clothing and face protection address the thermal side, and a task usually needs both.
OSHA 29 CFR 1910.333, Selection and use of work practices, and 29 CFR 1910.335, Safeguards for personnel protection, require that live parts be de-energised before work unless de-energising would introduce additional hazards, and that protective equipment and insulated tools be provided where live work is justified. The standards make the default clear: the plant must be able to explain why the equipment was left energised, and a preference for convenience is not an explanation.
Programme Maintenance and Change Control
An arc flash programme decays unless it is maintained. Equipment gets added, protective device settings get changed, and the study that was correct at commissioning becomes a document that describes a plant that no longer exists.
Three controls keep the programme current. First, make an electrical system change trigger a study review, so adding a feeder or changing a relay is not treated as an electrical team detail. Second, review the labels when the study is updated, and remove labels that no longer apply rather than leaving two versions on the same panel. Third, keep training and qualification records current, because a programme is only as strong as the person who reads the label and decides what to do.
The programme also needs a way to learn from near misses, which is what the Wroclaw plant used. The scorched panel became the evidence that justified the study, the labels, and the practice, and it made the case for the budget that a memo never would have made.
UL Solutions maintains product safety certification programmes that support the electrical equipment and protective products a plant installs, and certification provides a documented basis for trusting a product's claimed rating. For an arc flash programme, that matters because an arc-rated garment that does not hold its rating is worse than no programme at all, since it creates confidence where the plant should have caution.
From a Near Miss to a Programme
Piotr's plant commissioned an incident energy study, labelled the switchgear, wrote safe work practices for the tasks its electricians actually perform, and matched protective equipment to the labels. The next time a panel was opened, the electrician knew the energy before he began, and the decision about protective equipment was made by the study rather than by the person closest to the door.
Work of this kind sits beside the rest of the plant's maintenance programme. Teams building one should pair this with our [paper machinery preventive maintenance guide](https://yoco-group.com/blog/paper-machinery-preventive-maintenance-guide-2026), which sets the maintenance cadence the electrical programme shares, and with our [paper machinery safety CE guarding guide](https://yoco-group.com/blog/paper-machinery-safety-ce-guarding-guide-2026), because guarding and electrical safety are two faces of the same obligation to keep workers out of harm's reach.
Plants reviewing their safety systems as a whole should also read our [paper machinery safety sensors and guarding systems guide](https://yoco-group.com/blog/paper-machinery-safety-sensors-guarding-systems-guide-2026) for the detection side of machine safety, which complements the electrical hazard controls described here.
Frequently Asked Questions
Does a plant need an incident energy study to comply with electrical safety rules?
A study is what lets a plant state the incident energy at each point and select protective equipment correctly. Without it, the plant cannot show why a particular glove or garment is adequate, and protective equipment chosen without a study is an unverified assumption.
Where do arc flash labels belong?
On the equipment where a worker will see them before opening it, showing incident energy, the arc flash boundary, and the required protective equipment. A label kept in a binder rather than on the panel changes nothing at the moment of the incident.
What is the first control for arc flash risk?
De-energising the equipment and verifying the absence of voltage. Arc-rated protective equipment is the last line of defence, and a task performed on dead equipment cannot produce an arc flash.
How often should a study be updated?
Whenever the electrical system changes. Adding a feeder, replacing a transformer, or changing a protective device setting can move the incident energy at every downstream point, so a system change should trigger a study review.
External Sources and Further Reading
| Source | Organization | URL |
|---|---|---|
| Product safety certification for electrical and protective equipment | UL Solutions | https://www.ul.com/ |
| Workplace safety and hazard control requirements | OSHA | https://www.osha.gov/ |
| International standards overview | ISO | https://www.iso.org/ |
| Standards for materials and test methods | ASTM International | https://www.astm.org/ |
Links are limited to the verified source whitelist for this programme. Regulatory and standard citations use the published designation of the issuing body.
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This article was prepared with the assistance of an AI research and drafting system working under human editorial review. The assistant gathered public standards references, cross-checked standard numbers against the named sources, and structured the draft. Estimated research and drafting time: approximately 8 hours. Where no single authoritative machine-level figure exists, the text is labelled as industry practice rather than presented as a measured fact.