Listed and Labeled Electrical Equipment Required Under IRC 2024

Quick Answer

Under IRC 2024 Section E3404, all electrical equipment installed in a residence must be listed and labeled by a nationally recognized testing laboratory (NRTL) such as UL, ETL, CSA, or an equivalent body approved by the authority having jurisdiction. Listed equipment has been tested to applicable product standards and found to meet the safety requirements of those standards. Equipment that is not listed — including custom-built panels, uncertified imported fixtures, or equipment purchased from unverified online sources — is not permitted without a field evaluation performed by a qualified evaluation organization.

Under IRC 2024, inspectors will reject unlisted equipment at any inspection stage.

What IRC 2024 Actually Requires

IRC 2024 Section E3404.1 states that electrical equipment shall be acceptable only if it is listed and labeled, used or installed in accordance with its listing and labeling, and installed in accordance with any instructions included in the listing or labeling. This three-part requirement is important: a product is not compliant just because it carries a listing mark — it must also be installed within the scope of its listing and per the manufacturer’s instructions included in that listing.

A listed product is one that has been evaluated by a listing organization and found to comply with the applicable product standard. A labeled product carries the physical marking (a logo, mark, or label) of the listing organization on the product itself. Both conditions must be present. A product that was tested by a laboratory but does not carry the physical label in the field — because the label was removed or obscured — is not verifiably labeled from an inspection standpoint. The label must be present and legible on the installed product.

The most common listing marks seen on residential electrical equipment are: UL (Underwriters Laboratories, now UL Solutions), which covers the vast majority of electrical products sold in the U.S. retail market; ETL (Intertek), which is an equivalent NRTL recognized by OSHA and accepted by all IRC-based jurisdictions; CSA (Canadian Standards Association), which is an NRTL recognized in both the U.S. and Canada; and MET Laboratories, also an OSHA-recognized NRTL. Products bearing any of these marks from their respective testing programs are considered listed under IRC 2024.

Section E3404.2 addresses field-installed equipment and custom assemblies. Where electrical equipment is assembled in the field rather than as a factory-assembled, listed unit, the field assembly must comply with the applicable product standard and must be listed or evaluated through a recognized field evaluation process. Field evaluations are performed by NRTLs that offer field evaluation services (UL, Intertek, MET, and others). A field evaluation results in a field-applied evaluation label that certifies the specific installation complies with the applicable standard. This process is expensive and time-consuming, which is why specifying listed factory-assembled equipment whenever possible is strongly preferred.

Why This Rule Exists

Product listing requirements exist because electrical equipment failures — due to poor design, inadequate materials, or improper construction — are a leading cause of electrical fires. The listing process subjects equipment to standardized tests that simulate normal and abnormal operating conditions, including overload, short circuit, temperature cycling, and environmental exposure. Equipment that fails these tests does not receive a listing mark. Equipment that passes the tests is listed only for the specific conditions and applications covered by the applicable standard.

The listing process also ensures that the equipment’s design is reviewed by qualified engineers who understand the relevant hazards. A consumer-grade power strip, for example, that is listed to UL 1363 has been tested for overload protection, connector construction, cord strain relief, and temperature rise under load. An unlisted power strip assembled from substandard components may look identical but may lack the overload protection mechanisms that prevent fires when the strip is overloaded. These differences are not visible to an electrician or inspector without destructive testing.

The growth of online marketplaces has significantly increased the prevalence of counterfeit and uncertified electrical products in residential construction. Products bearing counterfeit UL marks — marks that look like genuine listing marks but were not authorized by UL — have been documented in recalls from the Consumer Product Safety Commission. Common counterfeit products include extension cords, power strips, USB chargers, ceiling fan controllers, and GFCI outlets. Field inspection cannot always detect counterfeits by visual inspection alone, which is why purchasing from reputable supply channels is important.

What the Inspector Checks at Rough and Final

At rough-in inspection, the inspector verifies that all installed wiring materials — NM cable, conduit, boxes, and cable connectors — are listed for their application. The inspector will look for listing marks on cable sheaths (printed at regular intervals on NM cable), on conduit fittings, and on electrical boxes. Boxes must be listed and of a listed type (metallic or non-metallic) appropriate for the wiring method and location. Cable connectors must be listed for the cable type and conduit or box combination.

At final inspection, the inspector verifies listing marks on all installed devices and equipment, including: receptacles and switches; luminaires and ceiling fans; panelboard and circuit breakers; AFCI and GFCI devices; EV charging equipment; kitchen appliances connected under the electrical permit; and any specialty equipment such as whole-house surge protective devices. The inspector will specifically look for the listing mark on the circuit breaker and verify it is listed for the panelboard manufacturer — cross-brand breaker compatibility is a common violation. They may also spot-check that the product installation matches the listing instructions (e.g., a luminaire rated for dry location only should not be installed in a damp or wet location).

What Contractors Need to Know

The listing requirement applies to the product as installed, not just as purchased. A circuit breaker that is listed by itself but is not listed for use in the specific panelboard where it is installed is a code violation. Panelboard manufacturers list their products with specific breaker types and brands that have been tested in that panel. The panel’s listing label identifies which breaker brands and types are acceptable. Installing a non-listed breaker in a panel — even if it physically fits — voids the panelboard’s listing and violates the code.

Contractors purchasing materials should buy from established electrical supply houses, not from general merchandise retailers or online marketplaces where counterfeit products are documented. If you receive a shipment of material where the listing marks look unusual, the label font is inconsistent, or the marks are printed rather than molded or embossed where they should be, contact your supplier and the listing organization before installing the product. Reject any material you cannot verify as genuinely listed.

Custom electrical assemblies — such as motor control panels, specialized enclosures, or equipment built to an owner’s specification — must be evaluated before installation if they are not manufactured as listed factory assemblies. The field evaluation process involves engaging an NRTL to send a field evaluation engineer to review the assembly against the applicable product standard. This process typically takes several weeks and costs $2,000 to $10,000 or more depending on the complexity of the assembly. Budget for this if your project includes custom electrical work.

What Homeowners Get Wrong

The most common homeowner mistake is purchasing electrical equipment from online marketplaces and assuming that any product claiming to have a UL listing is genuinely listed. The CPSC has documented numerous recalls of products bearing counterfeit listing marks. To verify that a product’s listing mark is genuine, go to the listing organization’s product database: UL maintains a searchable Product iQ database at iq.ul.com; ETL listings are searchable at intertek.com/marks/etl; CSA listings are at csagroup.org/testing-certification/product-listing. If the product does not appear in the database, do not install it.

Homeowners also frequently purchase “smart home” devices — smart plugs, smart switches, smart dimmers, and smart lighting controllers — from unverified online sources. These devices often lack genuine listing marks or carry marks for standards not recognized by OSHA. Smart devices installed in electrical boxes are electrical equipment and must be listed. If your smart home device does not carry a UL, ETL, or CSA mark from a reputable channel, it is not code-compliant and an inspector will reject it at final inspection.

Another common misunderstanding is the assumption that CE marking (a European conformity mark) is equivalent to a U.S. listing mark. CE marking is a manufacturer’s self-declaration of conformity with European product directives and is not issued by an independent third-party testing laboratory. CE-marked products are not listed under IRC 2024 unless they also carry a mark from a U.S. NRTL. Many electrical products imported from overseas carry CE marks but not UL, ETL, or CSA marks — these are not code-compliant for U.S. residential installation.

State and Local Amendments

The listing and labeling requirement in IRC 2024 mirrors the equivalent requirement in the National Electrical Code (NEC 110.2 and 110.3), so jurisdictions that have adopted either the IRC or the NEC apply this requirement. Some jurisdictions have adopted local amendments that identify specific listing standards for particular product categories — for example, requiring that EV charging equipment be listed to UL 2594, that solar inverters be listed to UL 1741, or that battery energy storage systems be listed to UL 9540. These product-specific listing requirements are typically consistent with IRC 2024’s general requirement but make the applicable standard explicit.

California has historically led in adopting product-specific energy efficiency requirements that intersect with listing requirements. California Title 20 appliance efficiency standards require that certain listed luminaires and controls also meet efficiency performance standards. In California, a luminaire may be listed to a safety standard but still not comply with code if it does not meet the Title 20 efficiency requirements. Contractors working in California should verify both the safety listing and the efficiency compliance of all luminaires and controls.

When to Hire a Professional

Homeowners who encounter a situation requiring a field evaluation — such as a custom panel, specialty equipment, or an unlisted product that a vendor is insisting can be used — should consult a licensed electrical engineer or electrical contractor before proceeding. Field evaluations require specialized knowledge of product standards and the field evaluation process. An electrical engineer can assess whether a field evaluation is necessary, identify the applicable standard, and serve as the project’s technical representative during the evaluation process.

For standard residential work, hiring a licensed electrician ensures that all materials sourced for the project come from reputable supply channels and are genuinely listed. Licensed electrical contractors typically have established accounts with electrical supply houses that source products from authorized distribution chains where counterfeit products are far less prevalent than in general retail or online marketplace channels.

Common Violations Found at Inspection

• Circuit breaker installed in a panelboard where the breaker brand is not listed for that panel manufacturer — a cross-brand compatibility violation even if the breaker physically fits.
• Luminaire installed in a wet or damp location that is rated for dry location only, outside the scope of its listing.
• Smart switch or dimmer installed without a genuine UL, ETL, or CSA listing mark, purchased from an online marketplace.
• CE-marked electrical equipment (European conformity mark) installed as if it were equivalent to a U.S. NRTL listing mark.
• Custom-built electrical enclosure or panel assembly installed without field evaluation, lacking a field-applied listing label.
• Listing label removed from equipment during installation, leaving no verifiable listing mark for the inspector to check.
• Product installed in a manner inconsistent with the listing instructions — such as a luminaire installed upside-down contrary to its mounting instruction, voiding the listing scope.
• EV charging equipment installed that is not listed to UL 2594 or an equivalent recognized standard for EV charging equipment.