Can I use an extension cord with my washing machine?
No, you should not use an extension cord with your washing machine. The power cord must be plugged into a grounded 3-prong outlet located within 4 feet (1.2 m) of where the power cord attaches to the back of the washer. Failure to follow this can result in death, fire, or electrical shock.
From the official Whirlpool Cabrio WTW6200SW Washing Machine manual, page 6
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