Originally Posted by InPhase277
You are reading through the other elements in the delta. You would have to disconnect one element end entirely to get an accurate resitance reading.
R total = (R1*R2)/(R1+R2)
So, if all of the elements are connected in the delta, and you put your meter across one element, you have 2 paths for current, one through the element you are testing across the other is through the other 2 elements in series, so ...
R total = (11.5*23)/(11.5+23) = 264.5/34.5 = 7.67
I think this proves what Inphase said, and also matches (pretty close) what the OP posted.
Edit for the OP:
480V / 11.5 ohms = 41.74A
41.74A * 480V = 20,035 VA (since PF is not a factor, it's 20kW)
20kW * 3 elements = a 60kW heater.