Could be drunk, could be incompetent, could be a mistake. At work professional union electricians wired 120VAC outlets for 208VAC. Luckily this was in the PC Techs area and the first thing they plugged in was a set of speakers. The tech was smart enough to know something was not right as the...
I work heavily with the security department at work. They have both 12VDC and 24VDC cameras. There have been "OOPS" where a 12V camera has been hooked up to 24VDC and that spells doom to the camera. But I've also seen the electrician that hooks up the 12VDC cameras use 16VDC supplies. The...