Engraved Electrical Panel Labels & Breaker Tags

What NEC 110.21(B) and 110.22 require on panels

NEC 110.21(B) covers field-applied hazard markings. They have to warn adequately, be permanently affixed, and hold up in the environment where they are installed. Handwriting is not allowed except for information that is likely to change. The informational note points to ANSI Z535.4 for signal words, colors and layout.

NEC 110.22(A) requires each disconnecting means to be legibly marked to show its purpose, unless the purpose is obvious from where it sits. The marking also has to be durable enough for the environment. Section 408.4 adds a circuit directory for each panelboard and, outside one- and two-family dwellings, a marking on every switchboard and panelboard that says where its power comes from.

An engraved phenolic tag meets the "permanent" and "durable" parts of these rules without much argument. The text is cut into the material, so it does not fade or peel the way a label maker strip can.

Panel, feeder and source-identification tags

A typical commercial panel gets three kinds of tag:

Panel ID. The name from the drawings, such as PANEL 2H1, with voltage, phase and wire count: 480Y/277V 3PH 4W.
Source of supply. FED FROM MDP-1, plus the room or location when the source is not in sight.
Feeder and disconnect tags. For feeders leaving a switchboard and for any disconnect whose purpose is not obvious.

Put the panel name on the top line in the largest text, and the electrical details on the lines below it. Inspectors and service techs read the name first.

Standard sizes and colors

Use	Common size	Common color
Panelboard ID	1 x 3 in to 2 x 4 in	White on black
Switchboard or MDP	2 x 6 in to 3 x 8 in	White on black
Emergency or life safety panel	1 x 3 in to 2 x 4 in	White on red
Standby or optional standby	1 x 3 in to 2 x 4 in	Black on yellow or as specified
Fed-from and feeder tags	1 x 3 in	Match the panel ID

Colors for normal, emergency and standby power often come from the project spec (usually Division 26 05 53) rather than the NEC. Check the spec first. If it is silent, the colors above are what most engineers expect.

Ordering a whole job from a panel schedule (spreadsheet)

Export your panel schedule or tag list to Excel or CSV and load it in the builder. Any column layout works. You point each column at a field (line 1, line 2, size, color, quantity) and the builder shows every tag at true size. Rows with text that will not fit get flagged before you send anything.

For a whole building it is often easier to email the schedule and let us set it up. You get one proof for the lot.

Mounting: adhesive vs screw holes

Adhesive backing works on clean, flat, painted steel indoors, which covers most panel doors. Wipe the surface with isopropyl alcohol first. For outdoor gear, textured paint, hot surfaces or anything that gets pressure-washed, add mounting holes and use rivets or self-tapping screws. Many specs call for mechanical fasteners on all nameplates, so check before you choose. Either option is included in the price.

Price examples in USD

Price is billed area times the rate for the thickness. Each side rounds up to the next whole inch. At the current provisional rates of $0.79 per square inch for 1/16 inch and $0.93 for 1/8 inch:

1 x 3 in panel ID, 1/16 in: 3 sq in x $0.79 = $2.37
2 x 4 in panel ID, 1/8 in: 8 sq in x $0.93 = $7.44
3 x 8 in switchboard tag, 1/8 in: 24 sq in x $0.93 = $22.32

See pricing for the full method.

How to label an electrical panel

Start from the panel schedule on the drawings, so names match what the next electrician will look for.
Tag the panel itself first: name, voltage, phase and wire count, and where it is fed from.
Fill in the circuit directory, then tag breakers and disconnects whose purpose is not obvious.
Pick colors from the project spec (normal, emergency, standby), then size each tag to the door.
Load the list in the builder, check the true-size proof and order the whole panel at once.

Commercial work needs permanent markings under NEC 110.21(B), so engraved tags beat label-maker tape here. Dwellings mostly need a legible circuit directory.

Disconnect marking under NEC 110.22 and 408.4

NEC 110.22(A) requires each disconnecting means to be marked with its purpose unless that is evident from its location. A safety switch next to the rooftop unit it feeds may not need much. A row of identical breakers in a distribution board does. Section 408.4(A) also requires every circuit and circuit modification at a switchboard or panelboard to be legibly identified by its clear, evident and specific purpose. "Spare" or "lights" is not enough.

A good disconnect tag names the load and where it is: RTU-3 ROOF or AHU-2 MECH RM 214. Add the source if it helps the next person: FED FROM 2H1-14.

Small-format tags for breakers and MCC buckets

Use	Common size	Price at 1/16 in
Breaker in a distribution board	1/2 x 2 in to 1 x 3 in	$1.58 to $2.37
MCC bucket	1 x 3 in to 1 x 4 in	$2.37 to $3.16
Safety switch or disconnect	1 x 3 in to 2 x 4 in	$2.37 to $6.32

Prices use the current provisional rate of $0.79 per square inch, with each side rounded up to the next whole inch, so a 1/2 x 2 inch tag bills as 1 x 2. Measure the space on the door or bucket before you pick a size.

Text size guidance for small tags

On a tag 1/2 inch tall, one line of text at about 1/4 inch is the practical limit. On a 1 inch tag you can fit two lines at about 3/16 inch, or one line at 3/8 inch. Text below 1/8 inch is hard to read from arm's length in a dim room. If the name does not fit, abbreviate it the way it appears on the drawings rather than shrinking the type. The builder shows the text height on every line and warns when it drops too low.

Bulk numbering from a spreadsheet

For a switchboard with 84 breakers or an MCC lineup with 40 buckets, typing each tag is slow. Put the text in a spreadsheet, one row per tag, and load it in the builder. Map the columns, check the preview and you are done. Sequential numbers (CKT 1 to CKT 84) can be filled in the spreadsheet in seconds.

Common questions

What does NEC require on an electrical panel label?

The NEC requires each disconnecting means to be marked with its purpose (110.22), a circuit directory at each panelboard (408.4(A)), and, outside one- and two-family dwellings, a marking on each switchboard and panelboard that identifies where its power comes from (408.4(B)). Hazard markings must be permanent and durable under 110.21(B). The project spec usually adds the panel name, voltage and phase.

Do panel labels have to be engraved?

No. The NEC asks for permanent, durable and legible markings, not a specific material. Engraved phenolic tags are the common choice because they meet that easily and many project specs call for engraved laminated plastic nameplates by name.

What color should panel labels be?

Use the project spec if it has a color schedule. Without one, white on black is standard for normal power, white on red for emergency and fire alarm, and a distinct color such as black on yellow for standby systems.

Can you make labels from my panel schedule?

Yes. Load an Excel or CSV export in the builder and map the columns, or email the schedule and we will set the tags up and send one proof.

How durable are phenolic labels vs printed labels?

Engraved phenolic tags hold up far longer than printed labels because the text is cut into the material rather than printed on top. They do not fade, smear or lift at the edges, and they tolerate heat and cleaning better than most vinyl.

How do I label a disconnect per NEC?

NEC 110.22(A) requires each disconnect to be marked with its purpose unless it is evident. Name the load and its location, such as RTU-3 ROOF, and use a durable, permanent tag. If the disconnect is not within sight of the load, also say where the load is.

What size tag fits an MCC bucket?

Most MCC bucket doors take a 1 x 3 inch or 1 x 4 inch tag. Measure the flat area on the door before ordering, since layouts vary by manufacturer.

Can you number hundreds of tags at once?

Yes. Put one tag per row in a spreadsheet and load it in the builder, or email the list. Each row becomes its own tag on one proof.

Code references are to NEC 2023 (NFPA 70) unless another edition is named, reviewed on 2026-10-14. Many US jurisdictions still enforce the 2017 or 2020 NEC, and some are moving to the 2026 edition, which renumbers a few sections. Local amendments apply. Your inspector (the AHJ) and your engineer of record have the final say on wording, colors and placement.

Engraved labels for electrical panels and breakers