Unit Converter & Reference Tables
Quick conversions and lookup tables for specifying equipment across US and international markets.
The converters run in your browser. The tables are quick references to point you at the right standard or classification, not a substitute for reading it.
Unit & Spec Converter
Quick conversions between kVA, kW, and power factor, AWG wire gauge and mm², and an approximate NEMA-to-IP enclosure rating cross-reference.
kVA ↔ kW ↔ PF
AWG ↔ mm²
NEMA ↔ IP Enclosure Rating (approximate)
| NEMA type | Approx. IP equivalent | Typical use |
|---|---|---|
| 1 | IP20 | Indoor, general purpose |
| 2 | IP21 | Indoor, light dripping water |
| 3 | IP54 | Outdoor, windblown dust/rain |
| 3R | IP14 | Outdoor, rain/sleet (vented) |
| 4 | IP56 | Outdoor, hosedown/splashing water |
| 4X | IP66 | Outdoor, corrosion-resistant + hosedown |
| 6 | IP67 | Occasional temporary submersion |
| 6P | IP67 | Prolonged submersion + corrosion-resistant |
| 12 | IP52 | Indoor, dust/dripping non-corrosive liquids |
Standards Cross-Reference (US ↔ International)
A quick-reference pairing of common US standards (ANSI/IEEE/NEMA/UL) with their closest international (IEC) counterpart for the same equipment category. These are commonly paired equivalents for similar equipment classes, not certified legal equivalencies — a UL listing and an IEC/CE certification are separate compliance processes with their own testing requirements.
Show the table · 9 rows
| Equipment category | US standard | International (IEC) standard |
|---|---|---|
| Power transformers | IEEE/ANSI C57.12.00 | IEC 60076 |
| Medium-voltage switchgear | IEEE C37 series | IEC 62271 series |
| Low-voltage circuit breakers | UL 489 | IEC 60947-2 |
| AC motors | NEMA MG-1 | IEC 60034 |
| Enclosure ratings | NEMA 250 | IEC 60529 (IP code) |
| Wire/cable sizing | AWG / NEC Chapter 9 | IEC 60228 (mm²) |
| Battery energy storage safety | UL 9540 / UL 9540A | IEC 62619 / IEC 63056 |
| Grounding / earthing | IEEE 80 | IEC 61936-1 |
| Surge protective devices | UL 1449 | IEC 61643 |
Compliance Mark Quick-Reference
Buyers often treat these marks as interchangeable — they aren't. Some are independent third-party certifications; one is a manufacturer's own self-declaration.
Show the table · 7 rows
| Mark | Issued by | What it actually means |
|---|---|---|
| UL Listed | UL (Underwriters Laboratories) | Third-party safety testing and certification to a US standard — the most common NRTL mark in North America. |
| ETL Listed | Intertek | An equivalent third-party NRTL certification to UL, testing against the same underlying US safety standards. |
| cULus | UL | Certifies compliance with both US and Canadian safety standards in a single mark. |
| CSA (or cCSAus) | CSA Group | Canadian safety certification; the cCSAus variant covers both Canada and the US. |
| CE Marking | Manufacturer (self-declared) | The manufacturer's own declaration of conformity to applicable EU directives, required for sale in the European Economic Area — not a third-party lab certification like UL. |
| RoHS | EU directive compliance | Restricts specific hazardous substances (lead, mercury, cadmium, and others) in electrical and electronic equipment. |
| FCC | US Federal Communications Commission | Certifies electromagnetic interference / radio-frequency emissions compliance for equipment containing electronics. |
HS Code Reference (Common Equipment Categories)
The Harmonized System (HS) is the WCO's internationally standardized product classification, used as the basis for every country's customs tariff schedule. The 4-digit headings below are stable across countries; the more specific 6–10-digit subheading that actually sets your duty rate depends on technical details (voltage class, power rating, technology) and the importing country's own tariff schedule — always confirm final classification with a licensed customs broker.
Show the table · 9 rows
| Equipment category | HS heading | Description |
|---|---|---|
| Transformers | 8504 | Electrical transformers, static converters, and inductors |
| Switchgear >1000V | 8535 | Electrical apparatus for switching/protecting circuits, voltage >1000V |
| Switchgear/breakers ≤1000V | 8536 | Electrical apparatus for switching/protecting circuits, voltage ≤1000V |
| Panels & switchboards | 8537 | Boards, panels, and consoles for electric control or distribution |
| Generating sets | 8502 | Electric generating sets and rotary converters |
| Motors | 8501 | Electric motors and generators (other than generating sets) |
| Batteries / accumulators | 8507 | Electric accumulators, including separators |
| Solar cells / modules | 8541 | Semiconductor and photosensitive devices, including photovoltaic cells |
| Insulated wire & cable | 8544 | Insulated wire, cable, and other insulated electric conductors |
External Data & Price Trackers
Copper/aluminum pricing and interconnection queue congestion both move fast enough that a static number on this page would be stale within days — so rather than publish figures we can't keep current, here are the real sources procurement and interconnection teams actually track:
- LME Copper and LME Aluminium — London Metal Exchange official daily reference prices, the standard benchmark for copper and aluminum used in cable, bus, and transformer winding cost.
- EIA Electricity Data — U.S. Energy Information Administration's industrial and commercial electricity price data by state, useful as an input to the transformer TCO estimator.
- Berkeley Lab "Queued Up" — Lawrence Berkeley National Laboratory's annual survey of US interconnection queues, aggregating data from ISOs/RTOs and utility balancing areas nationwide.