The Guide to the EMC Directive. 2nd edition. Chris Marshman. EPA Press. 245p softback. ISBN 0 9517362 7 2. £39.95.
A number of documents are required, many written in a legalistic way, when interpreting the needs for compliance to EMC standards.
This book consolidates this information into a handy guide on how companies can ensure that they comply with the various requirements, and is a short cut to accessing some 10 different documents from BSI, costing up to £40 each.
As the guide is less legalistic, it should be regarded as complimentary to the official documents. However, the text is not over simplistic, and provides useful guidance on how to interpret different options in the EMC standards.
Some of the interpretations, in fact, are now being confirmed in some recent guidance documents that are being issued by BSI. Typically, the need to test plug-in cards for PCs is suggested, rather than treating them as sub-assembly items.
Marshman also reinforces the role that the manufacturer is ultimately responsible for compliance, and he has to determine the level of risk he will take against expenditure needed to ensure EMC compatibility for each individual product.
There are three routes that are normally taken to check for conformity: type examination used for radio products; evaluation against standards; and a Technical Construction File, which can be checked out by a third party who is competent to assess compliance. Again, if the third party approves, it is still the manufacturer’s ultimate responsibility.
Chapter 10 describing practical routes to achieve compliance is particularly useful, along with a discussion of the key points to be considered in various standards.