Generic EMC standard - emission in industrial environments (CISPR Class A limits).
A generic standard specifying electromagnetic-emission requirements for equipment operating in industrial environments (indoor and outdoor locations) over the range 9 kHz–400 GHz. An industrial environment is defined by a dedicated power network supplied from an HV/MV transformer.
The standard is the emission counterpart of IEC 61000-6-2 and applies to equipment not covered by IEC 61000-6-3 (residential, commercial and light-industrial environments). The limits are intended to protect radio reception in this environment; the standard notes that in special cases, e.g. when a sensitive receiver operates close to the equipment, these levels may not provide sufficient protection.
The standard applies when no product or product-family EMC standard exists. A reference to “EN 61000-6-4” in a data sheet means a declaration that the component's conducted and radiated emissions remain within Class A limits for an industrial environment.
An emission declaration says nothing about equipment immunity; immunity is covered by EN 61000-6-2. In railways, EN 50121 standards take precedence and specify their own emission limits for rolling stock and infrastructure equipment.
Measurement methods come from CISPR standards: CISPR 16-1-1 to 16-2-3 (instrumentation and methods), CISPR 11 and CISPR 32; Class A limits are applied. Conducted emissions are measured at the AC mains port from 150 kHz to 30 MHz using a LISN with quasi-peak and average detectors.
Radiated emissions are measured from 30 MHz to 1 GHz and above 1 GHz in a semi-anechoic chamber or on an OATS at a standardised distance. The equipment under test operates in the mode producing the highest emissions in the measured band consistent with normal use; the result takes measurement-instrument uncertainty into account.
Ed. 3.0 clarified definitions of the average detector above 1 GHz, radiated limits with distinction of polarisation in frequency-matching ranges, and variants of equipment arrangement.
A reference to “EN 61000-6-4” in a data sheet means equipment intended for an industrial environment (Class A); for rolling stock and infrastructure equipment, check whether the manufacturer also states conformity with the relevant part of EN 50121, which takes precedence as the product standard.
