So I was helping on gig this weekend. Not my rig, not my equipment, not my gerry rigged connector, don't crucify me. Hotel ballroom with single phase 240 connection. Company has 3 phase distro and had a "california" plug that doubled up 2 legs to a single leg to get the feed from the single phase plug. So one leg of the single phase was actually feeding 2 legs of the 3 phase distro. When we metered the single phase we had 120 per leg everything looked great. When we plugged into the distro voltage dropped to 96 volts and had 30 some volts from one of the legs to ground. Guy that owns the rig says they connect up this way all the time with no issues before but we certainly had issues that day.
We removed the distro and I ran to my shop and got another single phase distro and did everything correctly.
My question is what would be causing the voltage issues just to know for future.
Thanks