Name:   wix - Subject:   International Electrical Code Date:   11/2/2016 9:17:10 PM

Now if you want to really confuse things, I lived in a southern city that required residential houses to meet the International Electrical Code, which required an extra ground wire....made no sense to me but cost a bundle.  BTW, my thinking on 60 cycle is the pulse goes from 110 VAC to 0, sixty time per second, not to -110 VAC, which is what the minus should mean.