A practical methodology for the measurement of screening effectiveness of trunking

The measurement methodology of determining trunking screening effectiveness is at present, very variable across the industry. The results obtained are equally variable. This paper describes a method of measurement which is practical in its application, and if implemented throughout the industry would reduce these inconsistencies. The results obtained using this methodology will show that a segmented conductive trunking system acts in a similar manner as a segmented screened cable. As such, the method of termination of a screened trunking system will effect its screening effectiveness in a similar manner to that for screened cables. Because of the differences identified, there is a need for standardising a measurement procedure for screening effectiveness to achieve reproducible results in a realistic and practical installation