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Power Conversion Guide
Overview
Concepts
Voltage & Frequency
Current Capacity
Wattage Ratings
UL Listing
Transformer Class
Transformer vs. Solid-state
Polarity
Adaptaplugs
Filtered
Regulated
Types of Conversion
Safety Warnings
Abbreviations & Glossary
Conversion FAQ's
AC to AC Converters
AC to DC Adapters
DC to AC Inverters
DC to DC Adapters

 RadioShack Guide to Understanding Power Conversion

Understanding Transformer Classes

Voltage Ratings Frequency Rating Capacity Rating Wattage Rating UL Listing Transformer Class Country of Origin Type: Adapter, Converter or Inverter Catalog Number, or SKU Number

There are three classses of power transformer. These classes are set in the National Electrical Code, ANSI/NFPA 70 and are identified by the circuit class they are designed for:

The power conversion devices discussed in this document will generally use Class 2 transformers.



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