Information to help in determining and selecting characteristics of transformers complying with BS 171. Covers tapping quantities, winding connections, parallel operation, loading capability of the neutral point and calculation of voltage drop or rise for a specified load condition.Cross References:IEC 60050(421):1990IEC 60076-1:1993IEC 60076-3:1980IEC 60289:1988IEC 60354:1991IEC 60722:1982IEC 60905:1987IEC 60909:1988IEC 60909-1:1991IEC 60909-2:1992IEC 61378-1:1997ISO 9001:1994