Was fixing a bad wiring job between a sub panel and a 240v 2 phase water pump and noticed that my multimedia was only testing it as 190v. Checked back at the breaker and saw the same. Checked between L1 and L2 on a different breaker and saw the same.
My 240v equipment (dryer, oven, water heater, 2 HVAC units) all work fine.
Should I be concerned?
How big of a deal is this? Like call an electrician asap or wait until I have some other electrical work lined up?
Power delivered to homes in the US is Split Phase. Meaning the distribution transformer was wired to a single distribution phase and it is center tapped. So you would get 120vac A to center, or B to center, but 240ac from A to B.
If it was 2 phase they would be 120 degrees out of sync and would deliver 208vac.