Standard icon


ANSI/IEEE 304-1977 - IEEE Test Procedure for Evaluation and Classification of Insulation Systems for Direct-Current Machines

Description: Insulation systems for direct-current machines are classified in accordance with their limiting temperatures as determined by test rather than by chemical composition. The intention is to classify according to the recognized A, B, F, and H categories by determining thermal capability in accordance with machine temperature-rise standards. This test procedure has been prepared to indicate accepted tests. It is applicable to insulation systems for use in usual service conditions. This standard does not cover special requirements such as for machines in gas atmospheres being subjected to strong chemicals, metal dusts, or submersion in liquids.
  • Status:Inactive-Withdrawn STDHelp

Get This Standard

Buy Purchase a copy of this standardBuyExternal Link
Buy VuSpec CD ROM This standard can be purchased as part of the following VuSpect CD:
- IEEE Electric Machinery Standards Collection: VuSpec™ Buy
Access with Subscription External Link Standards Online subscribers can access this standard in IEEE Xplore Digital Library. Access Learn More