American Dryer Corp. AD-20 - Manual (Page 21)

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b. Electric Models Only
1) Single-Phase (1ø) Wiring Connections/Hookup
If local codes permit, power to the dryer can be made by the use of a flexible U.L. listed power
cord or pigtail (wire size must conform to rating of dryer), or the dryer can be hard wired directly
to the service breaker panel. In both cases, a strain relief must be installed where the wiring enters
the dryer.