Abstract: An apparatus and method for remotely determining the phase of a single phase load on a multi-phase power distribution system, including powerline communications and repeaters. The phase determination being based upon comparison of message receipt times.

Abstract: A method and arrangement for circulating condenser cooling air through the condenser section of an air conditioner used in dusty and windy environments. The condenser section includes an air cooled fin-tube type condenser secured across a straight duct extending vertically through the horizontal housing of the air conditioner. During operation of the air conditioner, an axial flow fan mounted within the duct draws ambient air into the duct through an opening in the bottom of the housing in a direction generally perpendicular to the natural wind flow in the vicinity of the air conditioner and directs the air through the condenser whereafter it is discharged to atmosphere.