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"Wye" style 3 phase is symmetric between the phases, and what is in "modern" industrial buildings.
"Delta" style has a hot, or wild phase, which is higher potential compared to the other 2 phases, this makes it easier to get all sorts of single phase voltages in one building (120, 208, 220). Old industrial buildings use this.
I *think* you're in an old building, but if someone came in and updated it, all bets are off.
Don't blow your hands off testing the voltage between the phases.
If there is an orange wire, or a wire with orange electrical tape on it, then you have a wild leg delta, it's industry standard to label the wild leg as orange. In 480V feeds, that wild leg is 277V to ground, which is enough to maim or kill, so that's why they're careful to label it.
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Mike Bradshaw
1980 911SC sunroof coupe, silver/black
Putting the sick back into sycophant!
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