# Electrical Testing Reference

> Electrical Testing Reference is an encyclopedic reference on electrical acceptance and maintenance testing: test methods, the standards that govern them, equipment and instrument classes, certification, quantities and units, a glossary, organizations, and National Electrical Code adoption by state. Every fact on the site is a datum that cites its source. The site paraphrases facts and does not reproduce standard text, tables or acceptance values; the named standard governs.

## Page families
- Test methods (49): https://www.electricaltestingreference.com/tests/ - what each electrical test measures, why it is performed and the standards that call for it
- Standards (6): https://www.electricaltestingreference.com/standards/ - catalog facts for each standard: designation, edition, status, publisher and scope
- Equipment classes (0): https://www.electricaltestingreference.com/equipment/ - classes of electrical equipment and the tests that apply to them
- Instrument classes (0): https://www.electricaltestingreference.com/instruments/ - classes of test instruments and what they measure
- Certification and accreditation (7): https://www.electricaltestingreference.com/certification/ - technician certification and laboratory accreditation programs
- Quantities, units and formulas (2): https://www.electricaltestingreference.com/quantities/ - electrical quantities, units and formulas
- Glossary (2): https://www.electricaltestingreference.com/glossary/ - defined terms
- Organizations (4): https://www.electricaltestingreference.com/organizations/ - standards bodies, associations and accreditation bodies
- People (0): https://www.electricaltestingreference.com/people/ - people with a documented role in the field
- NEC adoption (0): https://www.electricaltestingreference.com/nec-adoption/ - the National Electrical Code edition in force in each US state, from public records

## Datum model
- The site holds 521 published datums. A datum is one sourced fact: an id (case-sensitive, for example nec.adoption.NV), a one-sentence statement, a kind, the subject page it belongs to, and a source block (designation, edition, clause, publisher, source class and catalog link).
- Each datum carries review_status (unreviewed, software_reviewed, human_reviewed, published), provenance_status, confidence, verified_on and a change history.
- Every datum has a permalink at https://www.electricaltestingreference.com/data/<id>/ and an index at https://www.electricaltestingreference.com/data/.
- Acceptance values from licensed standards are withheld, and material under an editorial or license hold is never served by the pages, the API or the MCP server.

## How to look things up
- Subject pages live at https://www.electricaltestingreference.com/<family>/<slug>/ (lowercase, trailing slash); each family hub lists its pages, and https://www.electricaltestingreference.com/sources/ lists every cited source.
- NEC adoption by state: https://www.electricaltestingreference.com/nec-adoption/ or the nec_adoption MCP tool with a USPS code or state name.
- Corrections: https://www.electricaltestingreference.com/corrections/ (log) and https://www.electricaltestingreference.com/contact/ (form). Changes: https://www.electricaltestingreference.com/changes/.

## Machine access
- Sitemap: https://www.electricaltestingreference.com/sitemap.xml
- Full page list: https://www.electricaltestingreference.com/llms-full.txt
- Read API (JSON, key-free at a low per-IP rate, keyed for higher limits, CORS open for GET): https://www.electricaltestingreference.com/api/v1/
- API: https://www.electricaltestingreference.com/api/v1/pages (optional family, limit, offset)
- API: https://www.electricaltestingreference.com/api/v1/pages/<family>/<slug>
- API: https://www.electricaltestingreference.com/api/v1/datums?family=<family>&slug=<slug>
- API: https://www.electricaltestingreference.com/api/v1/datums/<id>
- API: https://www.electricaltestingreference.com/api/v1/sources
- API: https://www.electricaltestingreference.com/api/v1/search?q=<words>
- API: https://www.electricaltestingreference.com/api/v1/nec-adoption/<state>
- OpenAPI description: https://www.electricaltestingreference.com/api/v1/openapi.json
- MCP server (Streamable HTTP, JSON responses, no authentication): https://www.electricaltestingreference.com/mcp
- MCP tool search: full-text search over pages and datums (query)
- MCP tool get_page: one page with its article and datums (family, slug)
- MCP tool get_datum: one datum by id (id)
- MCP tool list_sources: every cited source
- MCP tool nec_adoption: NEC edition in force (state, USPS code or name)

## Terms
- Machine-use terms: https://www.electricaltestingreference.com/machine-use/
- License: https://www.electricaltestingreference.com/license/
- How to cite: https://www.electricaltestingreference.com/cite/
- Attribution is required. No bulk republication of the site text or of API or MCP output as a dataset; rate limits apply.
- The standards cited are not the site's property and are not licensed by any output of the site.
- Attribution: cite as "Electrical Testing Reference" with the page or datum URL. Cite the governing standard for the fact.