BS 5049-2: 1994 CISPR 18-2: 1986 : Radio interference characteristics of overhead power lines and high-voltage equipment — Part 2: Methods of measurement and procedure for determining limits
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This publication applies to radio noise from overhead power lines and high-voltage equipment which may
cause interference to radio reception, excluding the fields from power line carrier signals.
The frequency range covered is 0.15 MHz to 300 MHz.
The general procedure for establishing the limits of the radio noise field from the power lines and
equipment is given, together with typical values as examples, and methods of measurement.
The clause on limits concentrates on the low frequency and medium frequency bands as it is only in these
that ample evidence, based on established practice, is available. No examples of limits to protect reception
in the frequency band 30 MHz to 300 MHz have been given, as measuring methods and certain other
aspects of the problems in this band have not yet been fully resolved. Site measurements and service
experience have shown that levels of noise from power lines at frequencies higher than 300 MHz are so low
that interference is unlikely to be caused to television reception.
The values of limits given as examples are calculated to provide a reasonable degree of protection to the
reception of broadcasting at the edges of the recognized service areas of the appropriate transmitters in the
a.m. radio frequency bands, in the least favourable conditions likely to be generally encountered. These
limits are intended to provide guidance at the planning stage of the line and standards against which the
performance of the line may be checked after construction and during its useful life.
The measuring apparatus and methods used for checking compliance with limits shall conform to
C.I.S.P.R. specifications, for example C.I.S.P.R. Publication 16: C.I.S.P.R. Specification for Radio
Interference Measuring Apparatus and Measurement Methods. For the frequency range above 30 MHz,
the measuring methods are still under consideration by C.I.S.P.R. although some basic aspects are given
in C.I.S.P.R. Publication 16.
BS 5049-2: 1994 CISPR 18-2: 1986 : Radio interference characteristics of overhead power lines and high-voltage equipment — Part 2: Methods of measurement and procedure for determining limits
BS 5049-2: 1994 CISPR 18-2: 1986 : Radio interference characteristics of overhead power lines and high-voltage equipment — Part 2: Methods of measurement and procedure for determining limits