I posted this link in the Elmers forum but it was suggested that this one may be more appropriate.
There is a very comprehensive set of notes and articles which outline various aspects of EMC (Electro Magnetic Compatibility) which can be found at http://www.compliance-club.com/KeithArmstrong.aspx
You may need to complete a free sign in to view this information, but I'd strongly recommend this to anyone who has an interest in the subject or is involved in any form of electronic design.
The sections on Design Techniques for EMC and EMC for Systems and Installations are probably the most relevant for amateurs.
Martin - G8JNJ www.g8jnj.webs.com