Electromagetic field and line-conducted interference needs to be eliminated in order to measure low-intensity partial discharges with a PD background noise level (≤ 1 pC) in accordance with IEC 60270. The effect of electromagetic field interference caused by radio signals, radar stations, welding arcs, etc. can be limited by a shielded room, also known as a Faraday cage. PowerHV supply shielding room for Routine and type testing of cable and cable accessories. The design and size of the shie...