ELECTRICAL REQUIREMENTS A 120 volt, 60 Hz., AC only, 15- or 20-amp, fused electrical supply is required. A time-delay fuse or circuit breaker is recommended. It is recommended that a separate circuit serving only this appliance be provided. DRAIN SYSTEM Drain system can be installed using a floor drain, wall standpipe, floor standpipe, or laundry tub. Select method you need. Floor standpipe drain system 4.5" (114 mm) Floor drain system 39" (990 mm) Minimum diameter for a standpipe drain: 2" (51 mm).