FCC: Federal Communications Commission. The US Federal Communications Commission specifies the maximum amounts of conducted noise signals (EMI) and radio frequency interference (RFI) that computer equipment is permitted to generate in Part 15 of the FCC Rules and Regulations. These limits are set in order to prevent computer equipment from interfering with the operation of radio and television receivers. Two different limits have been set, depending on the typical application and marketing of the computer equipment. The class “A” FCC limits are for equipment intended for use in commercial and industrial environments. The more stringent class “B” limits are for residential environments where TV and radio interference is more of a problem. Most personal computers are required to meet the class “B” limits since they are often sold for home use.
