How do I connect the output extension cables to Proheat 35?

Connect air-cooled or liquid-cooled output extension cables to Output Connector 1 and 2, ensuring both are of equal length (either 25 ft or 50 ft). If a single connection is made, place a protective plug on the unused port. (Page 23)

From the official Miller ProHeat 35 Industrial Heater manual, page 23

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