How do I connect input power to the XMT 304?
Always connect the grounding conductor (green/yellow wire) first, and always connect the green/yellow wire to the supply grounding terminal — never to a line terminal. Select the type and size of overcurrent protection using the Electrical Service Guide in Section 3-8, and locate the unit near the correct input power supply. (Page 18)
From the official Miller XMT 304 Arc Welder manual, page 18
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