Standards Reference
The codes and standards we design, manufacture, and test to. Each entry links to the issuing body’s catalog page where you can review scope or purchase the full document.
When a spec sheet says “ANSI/IEEE C57.12.91” or “UL 891,” it’s referencing the rules the equipment was designed and tested to. Knowing which standards apply to your project — and citing them on your RFQ — eliminates ambiguity in quoting and ensures the equipment matches code requirements at installation.
IEEE — Transformers (C57 series)
The IEEE C57 family is the umbrella for North American transformer standards. Most transformer specifications and test reports reference at least one C57 document.
IEEE / ANSI — Switchgear & Switchboards (C37 series)
The C37 series covers all aspects of switchgear from construction to testing to protective relaying. Critical references for any MV or LV switchgear project.
UL — Listings & Construction
Underwriters Laboratories listings are required for most U.S. installations. UL standards specify construction requirements that the equipment must meet to qualify for the UL mark.
NEMA — Industry Standards
NEMA publishes standards on equipment construction, ratings, and efficiency. NEMA standards are referenced extensively in product specifications.
NFPA — Safety & Code
NFPA standards govern electrical installation (NEC), maintenance practices, and worker safety. Required references on every project.
NETA — Field Testing
NETA’s Acceptance and Maintenance Testing Specifications are the de-facto standards for commissioning new equipment and periodic field testing. Most insurance carriers require NETA-compliant testing.
DOE — Efficiency Regulations
U.S. Department of Energy regulations on transformer efficiency. Compliance is mandatory for distribution transformers sold in the U.S.
ASTM — Test Methods
ASTM publishes the test methods referenced in IEEE C57.106 and other oil-quality standards. These are what your testing lab actually runs.
IEC — International Standards
For projects outside North America (or for U.S. projects with international scope), IEC standards are the equivalent reference.
OSHA — Worker Safety
OSHA 1910.269 governs work practices on energized electrical equipment. Combined with NFPA 70E it forms the basis for worker safety on every electrical project.
Always reference the latest revision year (e.g., “IEEE C57.12.00-2021”). Standards are revised periodically, and the equipment must meet whichever version is current at time of order. If you’re specifying for a project, name the standard AND the year — that eliminates ambiguity.
Spec to These Standards
Every transformer and switchgear we build is engineered to the relevant ANSI/IEEE/UL standards. Send us your RFQ.