Discussion at work yesterday:

I had always been told that it was not a 'good thing' to place two power 
elements in-line that have surge protection elements. Example: a rack-mounted 
UPS system from which rack power distribution panels are fed that have their 
own built-in surge protection.  I was surprised to learn that some of our 
architects had never heard of this.

I know that there are some electronic engineering types on this list (Mike). 
Can someone confirm whether or not this is true, or urban myth? And, if true, 
what is the principle behind the problem and the potential consequences?
-- 
burns
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