the receptacle that the 3 way tap was plugged into was origionally a 240 volt rececptacle. A 120v 20A receptacle has the other prong horizontal.
if guessing that origionally this was hooked up as a 220V outlet for a 220V water treatment system. somewhere down the line, someone installed a new system and rather than wiring properly, they just grounded one leg and twisted one prong so they could fit the plug into the outlet.
Re: 110 from 220#119202 12/08/0411:51 PM12/08/0411:51 PM