I don't know much about 240 V single phase power so please bear with me! I am confused about the wiring. Here is the situation.
In my outlet there are 3 wires, black, red and blue. I used my Fluke multimeter to check the voltages in between these lines. To my understanding, I should have L1 and L2 which are two signals 180 degrees apart, and a neutral.
I checked around with the multi meter until I found a voltage of 240 V and figured these were the L1 and L2 lines (red and black) and the third one (blue) must be the neutral, since the voltage between the third one and any of the other 2 was only 120.
So using just these two lines, I wired up my device (which is a DIY single phase to 3 phase converter for my milling machine) and it works just fine. But then I realized that the machine isn't grounded. For 120 V service, I am used to having a ground wire that I can hook up to the chassis for safety. So I go into the distribution box that the outlet is connected to and I see bare wire, which I presume is ground. So just to be sure, I shut off all of the power and did a continuity check between this bare wire and each wire in the outlet and I got continuity with the red wire! I don't understand this at all since the red and black were my L1 and L2 lines!
Can anyone explain why this is the case? I am pretty sure I CANNOT use the neutral line as a chassis ground and I want this machine to be grounded. Any help would be appreciated!
EDIT: In regards to wire color code. I am located in central PA.