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NEMA EW 1 1988 Edition, 1988
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Electric Arc Welding Power Sources
Includes all amendments and changes through Reaffirmation Notice , 2004
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ANSI/NEMA MW 1000, 2014
This Standards Publication defines minimum mechanical and electrical construction and performance requirements applying to the following arc welding power sources:

1. Single phase transformer or transformer-rectifier;

2. Polyphase transformer or transformer-rectifier;

3. DC generator;

4. AC generator or ac generator with rectifier; and

5. Associated electrical attachments.