What should I do before installing or servicing the welding generator?
Disconnect input power or stop the engine before installing or servicing this equipment. You must lockout/tagout input power according to OSHA 29 CFR 1910.147. Always properly install and ground the equipment according to the Owner's Manual and national, state, and local codes. (Page 5)
From the official Miller Millermatic 130 MIG Welder manual, page 5
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