RPi Class A and B
In response to recent questions here is so more information around compliance aspects of the Raspberry Pi uncased Model B.
The board underwent EMC testing which enables one to discern if it should be classed A or B. From pre-compliance testing (RPi) it was evident that the board would not meet Class B. It did not meet the Class B limit but did meet, and comply with, the Class A limit.
It is legally acceptable to place Class A equipment on the market for use in a domestic environment in both the EU and U.S. and to affix the CE and FCC marks provided that a warning is provided on the product that it may cause interference. In respect of the RPi the warning is on the Safety Data Sheet.