NFPA 70E
Standard for Electrical Safety in the Workplace
NFPA 70E is a standard issued by National Fire Protection Association covering arc flash risk assessment, incident energy labelling, and ppe category marking on energised equipment.
Read it at National Fire Protection Association
Affixure supplies artifacts and hosts records. We do not interpret this standard on your behalf and we do not certify compliance with it. The link above goes to the issuing authority so you can read the text yourself.
Who enforces this, and how it reaches you
Not adopted into law in most jurisdictions, but OSHA cites it as evidence of industry practice under the General Duty Clause. That distinction matters: you are not cited for breaching 70E, you are cited under the General Duty Clause with 70E as the yardstick.
How this differs from the neighbouring standards
Where NFPA 70 governs installation, 70E governs working on it safely once installed. It is the source of the arc flash label - incident energy, boundary, and PPE category - and of the requirement to assess risk before energised work. An electrician needs both, for different reasons.
What you have to be able to show
NFPA 70E is built around risk assessment rather than around a recurring service, which changes what evidence looks like. Equipment likely to be examined or serviced while energised is expected to carry a field marked label conveying the information a worker needs before opening it, and the analysis behind that label is expected to be reviewed periodically so that it still reflects the installation. What has to be provable is therefore the currency of the analysis, not the date of a task. A label showing incident energy is a claim about the system as it was configured when the study was run, and the system changes.
What the record adds that the tag cannot
This is the standard where the tag is most dangerously convincing. An arc flash label is authoritative in appearance and silent about its own age. A worker reading it has no way to tell whether the study behind it reflects the current configuration or a configuration that was replaced when the service was upgraded four years ago, and the label will not say. Binding the label to a record means the study date, the revision history and the periodic review are reachable from the equipment itself. That converts a static assertion into something with provenance. For a document whose whole purpose is to inform a decision about personal protective equipment before someone opens a panel, provenance is not a filing convenience.
The mechanics are the same for every standard, and they are set out on how inspection records work.
Why this is a different purchase from ordering the same item printed
Arc flash labels are widely sold as printed output from a study, and the printing is the easy part. What no printer supplies is any mechanism for a worker to establish whether what they are reading is current. The same label ordered here resolves to the study behind it, so the equipment carries both the conclusion and the ability to check its age. For every other item in this catalogue the record is about proving work was done. Here it is about a worker deciding what to wear.
Choosing a substrate for this environment
Arc flash labels are the one item here where substrate failure has a direct safety consequence rather than a recordkeeping one, because a worker reads the label to decide what to wear. They live indoors on switchgear, so the environment is mild, but the service life is long and the print must not fade to ambiguity. Specify a laminated polyester face for print permanence rather than for mechanical toughness. Placement matters as much as material: the label has to be readable before the enclosure is opened, which means the outer face at eye height, not inside the door.
Substrate and rating are stated on every product page. If you are not sure, compare the options or order the hundred unit minimum and see how it survives before committing a fleet to it.
Equipment this applies to
Consumables used under this standard
| Product | Substrate | From |
|---|---|---|
| Arc flash warning label, polyester | Polyester, UL recognised | $2.27 |
| Panel nameplate, three ply phenolic | Phenolic (three ply) | $2.75 |
Questions people ask about NFPA 70E
Do you perform the arc flash study?
No. The incident energy analysis is engineering work performed by a qualified engineer, and the values on the label come from that study. We print the label to the required format and bind it to a record so the study date and revision history are reachable from the equipment. We do not calculate, verify or certify the values.
Why does the label need a record behind it?
Because a label is a claim about a system configuration, and configurations change. Nothing about the physical label communicates whether it reflects the installation as it exists today or as it existed before a service upgrade. A worker who can scan it and see when the study was run and whether it has been reviewed is in a materially different position from one reading a laminate of unknown age.
How does this relate to NFPA 70?
NFPA 70, the National Electrical Code, governs installation and includes marking requirements for equipment. NFPA 70E addresses safety related work practices for people working on that equipment. In practice the NEC tells you the installation must warn, and 70E addresses the assessment and the practices behind the warning. Both pages exist here because the labelling obligations people arrive asking about sit across the two.