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All power and signal circuits entering the scan room must be equipped with RF filters to prevent unwanted RF from being conducted into the enclosure. Filters are usually fitted in both phase and neutral lines of power cables. To ensure patient safety, only approved types are used having a maximum leakage of 2 x 1.3 mA. Most conform to the EN 133200 and UL 1283 standards. Electrical filters are available from IMEDCO with rated currents of 20 A. Special 50VAC/100VDC filters are also available for signal leads entering or leaving the scan room. A stud close to the filters is provided for common grounding them and the RF shield.
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