International Standards and Conformity Assessment for all electrical, electronic and related technologies

SC 77A

EMC - Low frequency phenomena

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WG 2 Convenor & Members


Mr S Mark Halpin
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Mr Arun AggarwalIN
Mr Ton AlmeringNL
Mr Pasquale AmatoIT
Mr Antonio ArditoIT
Mr Andrzej BienPL
Mr Ilya BudovskyAU
Mrs Madeleine CARLIERFR
Mr Choon soo ChoKR
Mr Ahmet ferit cosanTR
Mr Frank DeterDE
Mr Mohamed Fuad FaisalMY
Mr Walter GebhartAT
Mr José Luis Gutiérrez IglesiasES
Mr José Julio Gutiérrez RuizES
Mr S Mark HalpinUS
Mr Zbigniew HanzelkaPL
Mr Richard E. HughesGB
Mr Thomas JäckleDE
Mr Ok-Seob LeeKR
Mr Yasunori MaekawaJP
Mr Julio J. MeleroES
Mr Wilhelm MombauerDE
Mr Andrew David NorteUS
Mr Michael O'DwyerIE
Mr Hak-tae OhKR
Mr Naotaka OkadaJP
Mr Sarath PereraAU
Mr B Subba RaoIN
Mr Géraud RiasFR
Mr José María Romero GordónES
Mr Fabio ScalonGB
Mr Kwangmu SonKR
Mr Mathieu Van Den BerghUS
Mr baoquan wanCN
Mr John M. WoodgateGB

Title & Task

WG 2

Voltage fluctuations and other low-frequency disturbances


a) To define limits, in product-family standards, of permissible voltage fluctuations produced by individual pieces of equipment intended for direct connection to supply systems and not submitted to approval by or notification to the supply authorities.

b) To give guidance on setting voltage fluctuations limits for
other low-voltage equipment for connection to supply systems,
particularly those submitted to approval by or notification to
supply authorities.

Note: In both cases a) and b) the conditions of use, the summation effects and propagation through the supply system (modelling of the system) should be taken into account.

c) To define the methods of measurement, test and calculations,
as required.

d) To use information received from SC 77A/WG 8 or from
international bodies on typical environmental voltage
fluctuations levels and maximum acceptable levels in supply
systems and to liaise with TC 77/WG 1 for terminology matters.