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Electromagnetic compatibility (EMC) - Environment. Compatibility levels for low-frequency conducted disturbances and signalling in public low-voltage power supply systems Ingestion-build-103253 BS EN 62670-3 provides you1 Scope and object This Part ofIEC 61000is concerned with conducted electromagnetic phenomena (disturbances and signals from mains communicating systems) in the frequency range from 0 kHz to 150 kHz. It gives compatibility levels for public low voltage a. c. distribution systems having a nominal voltage up to 420 V, single phase, or 690 V, three phase, and a nominal frequency of 50 Hz or 60 Hz. The compatibility levels specified in this document apply