Last Updated: 2026-10-07
Answer Capsule: Arc flash label placement follows NEC 110.16: the marking must be clearly visible to qualified persons before they examine, adjust, service, or maintain the equipment. Put it on the outside of the door or cover, one label per section, at eye level. Never cover a nameplate, listing mark, or panel schedule.
The study is done, the labels arrived, and someone on your crew is standing in front of a six-section switchboard asking where they go. Put them in the wrong spot and the inspector fails the job even though every number on the label is right. Print Pro AZ hears this from electrical contractors every month, usually the day before the walk-through.
This guide covers arc flash label placement for each type of gear on a commercial job. That means switchgear and switchboards, panelboards, motor control centers, disconnects, and meter socket enclosures. Brent Hanke, founder of Print Pro AZ, has watched thousands of these labels go out the door. The rules below come from what passes and what does not.
Where Does the Code Say an Arc Flash Label Has to Go?
The National Electrical Code, Section 110.16, sets the rule. The marking must be located so it is clearly visible to qualified persons before examination, adjustment, servicing, or maintenance of the equipment. That one sentence drives every placement decision. The label exists to be read before the work starts, not discovered after the cover comes off.
Two other rules back it up. NFPA 70E-2024 Section 130.5(H) requires the label on equipment likely to need examination, adjustment, servicing, or maintenance while energized. NEC 110.21(B), which 110.16 points to, requires field-applied hazard markings to be permanently affixed and durable for the environment. Its informational note points to ANSI Z535.4 for words, colors, and location.
What it means for you: The label goes on the outside, where a worker in the normal working position sees it. Under NEC 2026, this applies at any amp rating on service and feeder supplied gear in other than dwelling units. Our NFPA 70E 2024 arc flash label requirements guide covers what goes on the label. This post covers where it goes. Confirm which NEC edition your AHJ enforces before you finalize the set.
What Does "Readable Before the Cover Is Opened" Mean in Practice?
It means a qualified person can read every field on the label without removing a cover, opening a door, or pulling a dead front. A label on the inside of a panel door fails this test. So does a label on the back of a hinged cover, or one tucked behind a trim plate.
Here is a call Print Pro AZ gets every month. A contractor puts the label inside each panelboard door, next to the panel schedule. The reason given is "that is where the electrician looks." The inspector opens the first door, sees the label, and writes it up. The worker had to open the door to learn the hazard of opening the door.
The field test: Stand where you would stand to work on the gear. Look at it with the doors closed. If you can read the voltage, the boundary, the PPE data, and the date from there, placement is right. That placement is one of the five inspection failures in the Print Pro AZ field guide.
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Where Do Arc Flash Labels Go on Switchgear and Switchboards?
On switchgear and switchboards, place one label on the front of each section, on the door or cover, at standing eye level. Multi-section gear has several places a worker can open, and each one needs its own warning. One label on the main section does not cover the feeder sections down the line.
- One label per section. The study assigns incident energy per bus or per section. Print a label for each equipment ID the study lists and put it on that section.
- Line side and load side. If the engineer lists separate values for the line side and load side of the main, you need both labels. Put each one on the section it covers.
- Rear access. If the gear has rear doors a worker can open for maintenance, label the rear too. Same data, second location.
- Keep it off the nameplate. Never cover the manufacturer nameplate, the listing mark, or the short circuit current rating. Find clear steel next to them.
Where Do Arc Flash Labels Go on Panelboards?
On a panelboard, place the label on the outside of the door or on the front of the trim, never inside the door. Put it near the top where the handle does not block it, and keep it clear of the directory and the nameplate.
Most panelboards on a commercial job are 480/277 V or 208/120 V feeder-supplied panels. Under NEC 2023, feeder-supplied equipment came into scope at 1000 A and above. Under NEC 2026, the amp threshold is gone. That means every lighting panel in a non-dwelling building needs a full data label once your jurisdiction adopts the 2026 edition.
Sizing tip: Panel doors have limited flat space. A 3.5 by 5 inch label fits nearly every commercial panelboard door. Print Pro AZ makes an aluminum arc flash and shock hazard label in that size. It is .048 aluminum, built for doors that see foot traffic, carts, or weather.
Where Do Arc Flash Labels Go on Motor Control Centers?
On an MCC, place a label on each vertical section, on the front at eye level, and keep it off the individual bucket doors. Buckets get swapped. A label on a bucket leaves the section with the wrong data, or no data, after a change-out.
The main incoming section is the highest-energy spot in most MCCs. Label it first and confirm the equipment ID matches the study. Then work down the lineup, one label per vertical section. If the study gives one value for the whole MCC bus, use the same data on every section. Every section still gets its own label.
Field note: MCC rooms are often hot, dusty, and dim. Print Pro AZ prints MCC labels on UV-rated polyester or .048 aluminum so they stay readable. Our post on arc flash label materials and UL 969 covers which one fits your room.
Where Do Arc Flash Labels Go on Disconnects and Meter Sockets?
On a disconnect, place the label on the front cover next to the handle. On a meter socket enclosure, place it on the front cover, or on the adjacent enclosure surface if the cover is too small. Both must be readable from the normal working position with the cover closed.
Disconnects cause the most placement arguments. The cover is small, the nameplate takes half of it, and the gear is often outdoors. Here is the order Brent Hanke recommends:
- Use the smallest label size that still carries all four data items in readable type.
- Put it on the cover, beside the handle, not on the handle or over the nameplate.
- If the cover has no room, put it on the enclosure body next to the cover.
- Outdoors, use aluminum or UV-rated polyester so the sun does not erase the date.
Meter socket enclosures are named in the NEC 110.16 scope for non-dwelling installations. Under NEC 2026, they need the full data label at any rating. Ask the engineer for the meter center values when the study is ordered.
How High, How Bright, and What Should the Label Never Cover?
Mount the label at standing eye level, in the light the room normally has, on clean flat metal, and never over another required marking. None of those are numbers in the code. They are what makes the "clearly visible" rule work in the field.
| Question | Rule of thumb | Why |
|---|---|---|
| Height | Eye level for a standing worker | Read it before touching the gear |
| Lighting | Readable under normal room light | The inspector will not bring a flashlight |
| Surface | Clean, flat, dry metal | Adhesive fails on dust and oil |
| Nameplate | Leave it fully visible | Listing and rating marks are required |
| Panel schedule | Leave it fully visible | The directory is its own code requirement |
| Old stickers | Remove generic warnings | Two conflicting labels fail inspection |
| Multi-section gear | One label per section | Every door is a working position |
One more placement rule lives outside the gear. OSHA 29 CFR 1910.303(g)(2)(iii) requires warning signs at entrances to rooms with exposed live parts. That sign is not the arc flash label, and it does not replace it. The room sign warns anyone at the door. The arc flash label warns the qualified person at the gear.
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Frequently Asked Questions
Can I put the arc flash label inside the panel door?
No. NEC 110.16 requires the marking to be clearly visible before examination, adjustment, servicing, or maintenance. A label inside the door is only visible after the door is open. Put it on the outside of the door or the front of the trim.
Do I need an arc flash label on every section of switchgear?
Yes. Each section is a separate working position with its own door. Print one label per equipment ID in the study and place it on the matching section. If several sections share the same values, each one still gets a label.
Does the arc flash label go on the disconnect or the motor?
On the disconnect. The disconnect is the equipment a worker opens to service while it may be energized. The motor itself is not in the NEC 110.16 equipment list.
Do outdoor disconnects need a different label material?
Yes, in practice. NEC 110.21(B) requires the marking to be durable for the environment. Arizona sun fades vinyl, and the assessment date is the first line to go. Use .048 aluminum or UV-rated polyester outdoors.
Conclusion
Three takeaways. First, NEC 110.16 puts the label where a qualified person reads it before opening anything, which means the outside of the door or cover. Second, multi-section gear gets one label per section, and disconnects get the smallest label that still holds all four data items. Third, never cover a nameplate, listing mark, or panel schedule.
Getting placement right the first time means the inspector reads the label and moves on. Print Pro AZ prints your full set from the study data with same-week shipping.
Ready to label a lineup? Browse the arc flash label collection or call Brent: (602) 649-5305.
Sources
- NFPA 70, National Electrical Code
- NFPA 70E, Standard for Electrical Safety in the Workplace
- OSHA 29 CFR 1910.303, General Requirements
Brent Hanke | Print Pro AZ | (602) 649-5305 | b.hanke@printproaz.com
Brent Hanke is the founder of Print Pro AZ, supplying NEC-compliant labels to contractors across the country.