Hugh and James:
I’m missing something regarding EMP protection measures, and I could use some help.
I have researched EMP, how it’s created, and the common frequencies of EMP. I’ve looked into its relative intensity based on creation mode, altitude (in the case of nuclear devices), and the extended effects attributed to conductive networks. I understand what a Faraday cage is and how it works. And I’ve read numerous articles, lots of forum comments, endless opinions, a quantity of engineering documents, and several much learned evaluations on protecting against EMP.
The Problem
So here’s where I keep running aground: Protecting from EMP is, at its base, a simple affair. You provide a conductive shell around what one wishes to protect. Grounding that shell, or not grounding, is a subject of debate. However, my experience with electronics indicates that if the shell is doing its job, grounding it is not a problem. It may or may not be required, or even useful, to electrically insulate sensitive contents from the conductive shell. That answer depends on to whom that question is addressed. But consensus seems to indicate that it can do no harm.Continue reading“Letter Re: EMP Protection Measures”