I hope this post is accepatable to the host and does not violate the "ad" rule. I found the following quite interesting. Wearing the proper outer gear does not always translate to a safe condition.
http://www.ohsonline.com/Articles/2009/08/03/Arc-Flash-Training-PPE.aspx
http://www.ohsonline.com/Articles/2009/08/03/Arc-Flash-Training-PPE.aspx