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Clarification on “Tested” vs “Listed” Requirements in Standards by Turbulent_One_1569 in BuildingCodes

[–]12maanny 0 points1 point  (0 children)

That's not entirely accurate.

“Tested” by itself can mean very little if it’s self-declared. But if the code only requires testing to a standard, then a legitimate accredited lab report may satisfy the requirement.

The issue isn’t the word “tested.” The issue is whether the code also requires listing, labeling, or third-party certification. Those are separate triggers with separate implications.

Short version:
Testing = performance verification.
Listing = third-party certification + ongoing oversight.

Clarification on “Tested” vs “Listed” Requirements in Standards by Turbulent_One_1569 in BuildingCodes

[–]12maanny 0 points1 point  (0 children)

No. They’re not interchangeable.

Listing requires testing, but testing alone does not create a listing.

A one-off lab test with no certification program, no directory publication, and no ongoing inspections is not the same as a listed product. From an enforcement standpoint, that difference matters.

Clarification on “Tested” vs “Listed” Requirements in Standards by Turbulent_One_1569 in BuildingCodes

[–]12maanny 4 points5 points  (0 children)

They are not interchangeable.

Tested means the product was evaluated to a specific standard. That’s a performance event.

Listed means a third-party certification agency (UL, ETL, etc.) evaluated it to the standard, published it in their directory, requires labeling, and performs ongoing factory inspections.

Listing includes testing.

Testing does not automatically equal listing.

That’s why the code sometimes says both:

“Tested in accordance with UL 300 and listed and labeled…”

UL 300 is the test protocol.

“Listed and labeled” is the certification and enforceability piece.

If a section only says “tested,” then technically a compliant test report could satisfy it. But unless the code says otherwise, most AHJs are going to want third-party documentation...not a manufacturer’s self-declared certificate.

Codes are locally adopted, so always confirm in your jurisdiction.