>Assuming I did find a way to reliably blast a wire at 12V, >how are the switching components going to fare ? I can see you have not blown a fuse on your switchboard at home recently. The number of times I have taken a fuse holder out to find that the porcelain is copper plated ...... -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.