The article introduces the main contents of IEC 61000-3-3:2013 Electromagnetic compatibilty（EMC）-Part3-3:Limits-Limitation of voltage changes

voltage fluctuations and flicker in public low-voltage supply systems

for equipment with rated current ≤ 16 A per phase and not subject to conditional connection.The article explains measurement

test configuration

operating conditions

test requirements and limits and other requirements in the standard.The differences between new and old standard is analyzed.