1. IEC Standard 61000-4-30‘Electromagnetic compatibility (EMC), Part 4: Testing and measurement techniques, Section 30: Power quality measurement methods’, , 2003 International Electrotechnical Commission, Geneva
2. IEEE Standard 1159: ‘Recommended practice for monitoring electric power quality’, and new draft standard P1159.1, (IEEE, New York, 1995) (Numerical example: http://grouper.ieee.org/groups/1159/2/wave7.xls, accessed July 2005)
3. IEEE Standard 1100: ‘TEEE recommended practice for powering and grounding sensitive electronic equipment (Emerald Book)’, (IEEE, New York, 1999)
4. South African Standard NRS 048-1: ‘Electricity supply – quality of supply, Part 1: Overview of implementation of standards and procedures’, (South African Bureau of Standards, 2002)
5. European∕British Standard BS∕EN 50160: ‘Voltage characteristics of the electricity supplied by public distribution systems’, (EuroNorms, CLC, BTTF 6S-6, 1994)