In one of my discussions with my autocad reseller, he told me that autocad bought Promise E which was an electrical package on its on and customized it to suit their needs, hence autocad electrical.
i have a 20+ year electrical library built up of symbols from autocad 14 days. when my honey do list is small, i plan to load the electrical package on my laptop and learn that. it seems to be a pre-requisit for engineering / support in this area.
regards,
james