That's a long term, Can you find a way to shorten that up?
When metering the lost leg to ground, you are essentially metering the other leg thru a line to line load (or thru two line to neutral loads). There is essentially no voltage drop through the resistance of the loads because you are using a high impedance meter.
L1 and L2 are connected together probably through a control transformer so if there is power (120 volts) going to only one of them you will still read a voltage to ground on either one.
You are measuring the same phase, since the other phase (or leg) is dead, the voltage is in series with leg that is still working, I get so many calls in where they say “I’m getting 120 volts (or 277) to ground but it doesn’t work”. When I tell them check phase to phase, they come back with “Oh! I’m getting nothing between A and B or any combination there of”
Since your line to line voltage is supposed to be 208, the source pretty much has to be 208/120 three phase wye, they just run single phase feeders consisting of two phase conductors and neutral conductor to each apartment. Conventional sources that produce 208/120 have to be three phase
Majority have dual rating with the 208 being about 25% less than the 240 volt rating.
Usually have to get into commercial appliances for that. Household appliances are 120/240 with lesser rating marked for 208 volts. The dryer usually has 120 volt controls and motor - it still sees same voltage on either system, just the heat element is going to less watts @ 208 volts, and possibly will take longer to do the same task under same conditions. Ranges, cooktops, ovens - clocks, lights, convection blowers are 120 and see same voltage either way, again just the heating elements will be less watts when connected to 208 and may mean more time to do same task in some situations.
