Appendix C: Electromagnetic Compatibility
Page C–3Stellar
®
SR55 Series Soft Starter User Manual – 1st Ed, Rev F – 09/18/2019
c.5 – emc bAsIc cRITeRIA
The electromagnetic compatibility of a product is defined by two criteria:
1) Immunity to electromagnetic disturbances generated externally to the product.
2) The type and amount of conducted and radiated electromagnetic emissions emanating
from the product.
Ascertaining the nature of the power supply is of primary consideration when deciding on
appropriate EMC requirements. The requirements for equipment installed in heavy industrial
environments (fed from their own isolated low voltage power supply) differ from those
installed in residential, commercial, light industrial, and health-care applications (directly
connected to a public low-voltage network).
Generally, industrial installations require higher immunity levels and permit higher levels
of conducted and radiated emissions than those for non-industrial installations. On the
other hand, lower levels of emissions output, and lower immunity levels, are specified for
installations connected directly to the public low-voltage network.
c.6 – puRchAsING ImplIcATIoNs of meeTING AN emc sTANdARd
Before purchasing components for the installation, the specifier must evaluate the expected
source of power for the Soft Starter and understand exactly the implications for meeting EMC
requirements. It is likely that failure to do so will result in the purchase and installation of
inappropriate equipment.
IMPORTANT: The information and guidance given in section C.7 forms
part of the statutory requirements of the European Union Directive
2004/108/EC on EMC.
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