Had my first dealings with 2 phase. Was disconnecting a machine and wanting make sure all the leads are identified, I started going over everything. At first I thought the 4 pole disconnect may have had a nutreal being disconnected. But wait there is no 110v on this machine. readings to ground were all over, and there was 2 sets of 240v. Aaaa wow! 2 phase. I thought it was a urban legend! Sure as could be a 3 phase to 2 phase 50kw trans. What I have learned to be a Scot Trans. comments welcome:)
The strangest voltage system I ever saw was in Jersey City. There were 3 phase legs going to a machine. You got 240 volts between each phase leg. On 2 of the phase legs you got 120 volt and on the third leg you got zero voltage to ground. There was no neutral for these machines. I was told that it was a very old style system.
No, I believe it was 120-125 volts to ground and 240 between legs. The 3rd leg was zero volts to ground. Even my old boss found this wiring system to be real weird. He used to work for Bendix and they made airplane parts here in NJ. They use to work with all sorts of wacky voltage and freq. in their factory. They even had one system that was 400 Mz I believe. It was for satellites or something.
As I said to Greg, I believe it was around 125 volts. It as many years ago and my memory isn't what it used to be. I just started as an apprentice with the old boss, so that would have been around 1977. Plus I only saw this type of system once in all the years I have been doing electrical work. I was more a resi-com type of electric, not much into heavy industrial.
I am not sure how you can have 240 volts from phase to phase, one phase that looks be grounded and not have 240 to ground. It may be impedance grounding on that corner and a low impedance measuring tool (wiggy?)