NFPA 70
National Electrical Code
NFPA 70 is a standard issued by National Fire Protection Association covering panel directories, disconnect identification, and available fault current marking.
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
Adopted into law state by state, frequently with amendments and often a cycle or two behind the current edition. Enforced by electrical inspectors at permit and final inspection rather than on an ongoing basis.
How this differs from the neighbouring standards
The National Electrical Code governs installation: how equipment is put in, marked, and identified. It is adopted into law state by state, often with amendments, so the edition in force where you work may lag the current one.
What you have to be able to show
The National Electrical Code is an installation standard, and most of what it requires is built into the work rather than recorded afterwards. Where it becomes a labelling question is in the markings equipment must carry: identification of disconnecting means, warnings where equipment may be worked on while energised, and field applied markings that have to remain legible for the life of the installation. That last requirement is the one with practical consequences for what you buy, because durability is not a preference here. A marking that has faded to illegibility in a switchgear room is a marking that no longer does anything, and legibility is judged in the field years after the electrician has gone.
What the record adds that the tag cannot
Electrical installations are modified continuously and documented occasionally. Circuits are added, panels are re-fed, disconnects are relabelled by whoever was on site, and the accumulated result is a panel schedule that describes a building that no longer exists. The physical label cannot solve this because it has no way to indicate its own age. A serialised marking resolves to a record showing when it was applied and what it was applied for, which turns an anonymous laminate into something with a date attached. For an installation that will be modified by a dozen different contractors across its life, knowing when a marking was made is often more useful than what it says.
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
Electrical marking is bought by the roll and applied by the electrician, and durability is the only property anyone specifies. We take the same specification seriously - substrate and rating are on every product page - and add the one thing a roll of labels structurally cannot have, which is a record of when each marking was applied and by whom. On an installation that outlives everyone who worked on it, that is the difference between a label and a document.
Choosing a substrate for this environment
The Code requires field applied markings to have sufficient durability for the environment, which is deliberately non-specific because a marking in a conditioned electrical room and one in an outdoor pad mounted enclosure face different problems. Indoors, print permanence under long term lighting is the constraint. Outdoors or in unconditioned space, thermal cycling attacks the adhesive first: the label survives the temperature but the bond does not, lifts at a corner and collects moisture. For anything exposed, specify outdoor rated stock and clean the surface first, because most early adhesive failures are contamination rather than material.
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 70
Does the NEC require serialised labels?
No. The Code addresses what markings must convey and requires that field applied markings have sufficient durability to withstand the environment. Serialisation is not a Code requirement and we do not present it as one. It is a property we add because electrical installations are modified by many hands over a long life and an undated marking cannot tell you whether it still describes the circuit.
What substrate should be used in a switchgear room?
Durability requirements depend on the environment, which the Code addresses in general terms rather than by prescribing a material. Each product page states the substrate and what it is rated for so the specification can be matched to the location. The practical failure to design against is adhesive and print legibility over years of heat rather than mechanical damage.
How is this different from the arc flash label under 70E?
Different purpose. NEC markings identify equipment and warn that a hazard exists. The 70E label conveys the result of an incident energy analysis so a worker can select protective equipment. They often appear on the same panel and are frequently confused, which is why they are separate products and separate records here.