Whether you need class A or B is dependent upon the type of product that you are making: ITE equipment intended for use in a domestic environment must meet class B, examples of such equipment would be PCs or battery operated portable equipment. Equipment that is not designed for use in a domestic environment only has to meet Class A.
The measurement distance is 10m for both Class A and Class B Further information can be found in Sections 4 and 6 of EN55022:1994. regards Charlie Charlie Blackham Senior Approvals Engineer Madge Networks Ltd. x31592
