Signs, UXYT

Guide Information for Electrical Equipment for Use in Ordinary Locations



This category covers signs that are electrically operated and/or illuminated using incandescent lamps, LEDs (light-emitting diodes), electro-luminescent panels, neon tubing, fluorescent lamps, high-intensity-discharge lamps or combinations thereof for installation in accordance with Article 600 of ANSI/NFPA 70, "National Electrical Code" (NEC).

Cord-and-plug-connected signs do not have provision for permanent mounting to a building or structure. Due to servicing considerations, specific types of cord and plug-connected signs are intended and have provision for installation on end-use equipment.

Signs or sections of a sign forming a complete enclosure intended for permanent connection to a source of supply are provided with permanent means for attachment to a building, to a support or to a hanging rig. The mounting hardware, poles and other structural components of a sign have not been evaluated with respect to local variable conditions such as local wind and snow loading or soil conditions.

Electric signs, of such size that shipment in one carton or fully assembled is impractical, may be divided into sections. Each major subassembly bears an "Electric Sign Section" Certification Mark. Sign faces, trim and mounting hardware are not considered major subassemblies. Each sign has installation instructions describing or illustrating the proper assembly, mounting and connection of the sign sections. The acceptability of the assembled sections in the field rests with the Authority Having Jurisdiction.

Signs or sections of a sign, such as gasoline pump toppers, that are intended to derive power from within flammable- or combustible-fuel-dispensing equipment require special investigation to UL 87, "Power-Operated Dispensing Devices for Petroleum Products" (see Retrofit Assemblies (ERKQ)). The acceptability of such electric signs installed on or near fuel-dispensing equipment is subject to the provisions of Article 514 of the NEC, and rests with the Authority Having Jurisdiction.


All signs are marked to indicate their intended use location using one of the following environmental location markings:

"Dry Locations Only"
"Suitable for Damp Locations"
"Suitable for Wet Locations"

Signs, whether permanently connected or cord-and-plug connected, are only investigated for installation in accordance with their marked environmental location. Signs marked "Dry Locations Only" are only investigated for indoor use.

Signs, sign sections or outline lighting marked "The neon supply(ies) complies(y) with the secondary ground-fault protection requirements of UL 2161" are provided with neon transformers and power supplies that comply with the secondary fault protection requirements specified in UL 2161, "Neon Transformers and Power Supplies."


This category also covers signs that are rebuilt by the original manufacturer or another party having the necessary facilities, technical knowledge and manufacturing skills. Rebuilt signs are rebuilt to the extent necessary by disassembly and reassembly using new or reconditioned parts. Rebuilt signs are subject to the same requirements as new signs.


One of the following product identities appears on the product:

    Electric Sign

    Electric Sign Section

For rebuilt products, the word "Rebuilt" precedes the product identity.


Accessories intended for use in certified signs are covered under Sign Accessories (UYMR).

Retrofit conversions intended to be field installed in certified electric signs are covered under Sign Conversions, Retrofit (UYWU).

Changing message center signs may contain integral controllers or may be intended for use with externally connected controllers. Externally connected controllers are covered under Sign Controllers, Message Centers (UYTQ).

This category does not cover billboard illumination, exit lights, skeletal neon tubing for show windows, or illuminated clocks rated 600 V or less.

Field-assembled neon systems used in display windows, outline lighting, or skeletal neon signs are covered under Skeletal Neon Sign and Outline Lighting Systems, Field Assembled (UZBL).

Field-assembled cold cathode electric discharge lighting systems that provide general illumination are covered under Electric Discharge Lighting Systems, Cold Cathode (IFAY).

Field-installed neon outline lighting systems that outline or call attention to architectural details of a room or building are covered under Field-installed Neon Outline Lighting Systems (UYAM).

Products whose primary intent is to display, store, or support merchandise, such as gondolas, kiosks, product platforms, wall shelving units, cash-wrap counters, and nonmotorized check-out stands are covered under Commercial Displays (IYMX).

Showcases are covered under Wired Cabinets (ZNXR).


For additional information, see Electrical Equipment for Use in Ordinary Locations (AALZ).


The basic standard used to investigate products in this category is ANSI/UL 48, "Electric Signs."

Electric signs that comply with the requirements in UL 153, "Portable Electric Lamps," may also be certified as Portable Lamps (QOWZ).


The Certification Mark of UL on the product is the only method provided by UL to identify products manufactured under its Certification and Follow-Up Service. The Certification Mark for these products includes the UL symbol, the words "CERTIFIED" and "SAFETY," the geographic identifier(s), and a file number.

The Certification Mark for this category requires the use of a holographic label.

Alternate UL Mark

The Listing Mark of UL on the product is the only method provided by UL to identify products manufactured under its Listing and Follow-Up Service. The Listing Mark for these products includes the UL symbol (as illustrated in the Introduction of this Directory) together with the word "LISTED," a control number, and the product name "Electric Sign" or "Electric Sign Section."

For rebuilt products, the word "Rebuilt" precedes the product name.

The Listing Mark for this category requires the use of a holographic label.

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UL, in performing its functions in accordance with its objectives, does not assume or undertake to discharge any responsibility of the manufacturer or any other party. UL shall not incur any obligation or liability for any loss, expense or damages, including incidental or consequential damages, arising out of or in connection with the use, interpretation of, or reliance upon this Guide Information.

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Last Updated on 2018-11-13
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The appearance of a company's name or product in this database does not in itself assure that products so identified have been manufactured under UL's Follow-Up Service. Only those products bearing the UL Mark should be considered to be Certified and covered under UL's Follow-Up Service. Always look for the Mark on the product.

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