The electrical power, from its origination to the system, must adhere to the wire size andtransformer sizes as prescribed in the installation drawings. The feeder voltage-drops, as well asthe supplying power, must be within the given parameters. Sizing for feeder is usually calculatedfor a maximum of 2% voltage drop at the minimum voltage range. The actual feeder sizing mayvary from the installation drawing for a facilities voltage.Calculate feeder losses before you begin. Total feeder losses must be calculated to ensure thatthe losses are less than those specified in the installation drawings. Calculating the recommendedminimum transformer sizing for feeding a system ensures the transformer losses are less than halfof the maximum regulation for the system.