In the U.S. the Federal Communications Commission (FCC) regulates the amount of acceptable EMI/RFI emissions a product can produce. In Europe the EMC directives have regulations for emissions and immunity class testing of electrical products. Enclosures used to house electrical products or systems are required to comply with the above mentioned directives, although empty enclosures are not required to meet any regulatory requirements.
Enclosure EMI/RFI performance is frequently expressed as shielding effectiveness over a range of frequencies. Several standards address test methods for determining enclosure EMI/RFI performance.
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