BS IEC 62153-4-17:2018 Metallic cables and other passive components. Test methods Electromagnetic compatibility (EMC). Reduction Factor

Communication cables
Metals
Electrical measurement
Attenuation
Electromagnetic compatibility
Couplers
Electric cables
Coaxial cables

Link: BS IEC 62153-4-17:2018 Metallic cables and other passive components. Test methods Electromagnetic compatibility (EMC). Reduction Factor
Source: BSI Standards