4,334 records

Which OSHA-recognized labs can certify to this test standard?

4,334 records covering 1,065 test standards, one fact each. Every value is transcribed from the source that states it and carries the sentence it was taken from: 23 sources across 1 site, last checked 2026-09-17, due for re-check by 2026-12-07. Every record has a page of its own, quoting the line that states it.

1 record where two or more sources state different values. Both sides are reproduced on the record page, each with its own source and quote.

About this data

The inverted view of OSHA's Nationally Recognized Testing Laboratory program: for each test standard, every NRTL currently recognized to certify products to it. Answers 'which NRTLs can certify to UL 508A', 'can anyone other than UL list to UL 1741', 'is my lab's mark acceptable to OSHA for this product', and 'who else could quote this job'. OSHA publishes the recognition one laboratory at a time — twenty separate pages, each a long table of that lab's standards — and its own list-of-standards page says so in as many words: 'See individual NRTL informational web pages to determine which of these standards fall within an NRTL's scope of recognition.' So the question a manufacturer actually has (who may certify my product, and therefore who can I ask for a price) requires opening and searching twenty pages, and nobody publishes the answer.

The data

Showing the first 400 of 4,334 records. Every record has its own page, with its source and the quoted line that states it; these list the rest.

• Records 1–400ANSI A90.1 … UL 991
• Records 401–800UL 998 … UL 62841-2-10
• Records 801–1,200UL 62841-2-11 … UL 404
• Records 1,201–1,600UL 407 … UL 60745-2-19
• Records 1,601–2,000UL 60745-2-20 … UL 1951
• Records 2,001–2,400UL 1993 … UL 1018
• Records 2,401–2,800UL 1023 … UL 45
• Records 2,801–3,200UL 48 … UL 1242
• Records 3,201–3,600UL 1247 … CSA/AM Z21.17
• Records 3,601–4,000CSA/AM Z21.18 … UL 1058
• Records 4,001–4,334UL 1059 … UL 122701

Where this came from

Every record above links the page it was taken from and quotes the sentence that states it. These are the 23 sources this dataset was assembled from.

• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/standards-no-longer-recognized
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/list-standards
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/BACL
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/csa
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/csl
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/dekra
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/element
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/fm
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/iapmo
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/its
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/jet
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/lc
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/met
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/nna
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/nsf
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/qai
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/qps
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/sgs
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/solarptl
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/swri
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/tuv
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/tuvam
• osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/ul

Machine-readable

• data.jsonThe whole dataset — every record with its source URL and source quote.
• Open Knowledge Format bundleOne JSON object per line — every record's frontmatter and quoted span exactly as it is held here, in one fetch.
• data.csvThe same records as one flat table, for a spreadsheet or a dataframe. The last four columns are the source URL, the quoted sentence it was read from, the date we last checked it, and which columns are our reading rather than the page's words.
• How this is made and checkedWhat "verified against source" does and does not mean.

From your own code

Same records, same quotes, without scraping the page: refsource is on PyPI and npm. Each value comes back carrying the URL it was read from and the sentence on that page that states it — .source and .quote sit on the value itself rather than in a side channel, so the checking step is available instead of skipped.

pip install refsource
refsource lookup nrtl-recognized-test-standards standard_number="ANSI A90.1"

npx -y refsource lookup nrtl-recognized-test-standards standard_number="ANSI A90.1"

Set your AI assistant up to use this

Two files and no account. Put this in .mcp.json at the root of your project — Claude Code, Cursor, Windsurf, VS Code and Codex all read that file — and your assistant can look this dataset up instead of recalling it. The server is remote, keyless and read-only.

{
  "mcpServers": {
    "referencesource": {
      "type": "http",
      "url": "https://referencesource.org/mcp"
    }
  }
}

Add to Cursor · or, on the command line: claude mcp add --transport http referencesource https://referencesource.org/mcp --scope project

Then one line in the project's CLAUDE.md or AGENTS.md, so the assistant knows when to reach for it:

When a question needs "Which OSHA-recognized labs (NRTLs) can certify to a given test standard", call the referencesource MCP server at https://referencesource.org/mcp (tool `search_records`, dataset_slug `nrtl-recognized-test-standards`) instead of answering from memory — every record it returns carries its source URL and a verbatim quote from that page.

What each tool does, and the servers built over single registers: Connect your AI assistant.

4,334 records. last verified against source 2026-09-17. due for re-check by 2026-12-07.

Licence. OSHA web content is a US government work in the public domain. Records quote the row verbatim and link to the OSHA page they came from.