NEMA ICS 20:2009 (R2015)

FOREWORD As a result of increased activity in the field of harmonization, primarily involving North American and IEC based standards for electrical equipment, new topics and terminology continue to surface that are increasingly confronting the public and users at large, but which may not be clearly understood. This informational guide was created to provide additional background information on various key topics of interest related to the application and proper usage of electrical equipment in the global marketplace. The topics in this document do not contain all the details and variations of all the mentioned equipment. However, Standard and Code references have been included in the different sections with the intent that users reference them as necessary. In addition, we recommend that you contact the product manufacturer for any product-specific questions that are not covered in this informational guideline. Referenced Standards are intended to be those of the latest revision or latest edition.