I'm prone to brain farts, but here's the OP
I measured the amperage on a neutural that is part of a 3 wire 100 amp panel, 120/240 volt. One hot carried 21 amps, second leg carried 38amps and the neutural carried 26 amps. Does this sound normal for the nuetural to carry so much current?
If every single load was L-N,( and wouldn't that be the worst possible situation for current on the neutral) it would not have that much current on the neutral.
If there were ANY L-L loads there would be less on the neutral yet.
So, I'm missing what the L-L loads have to do with it.
It's 4 amps too much for the worst possible situation, with those magnitudes of current on each phase..
Like I said, I often miss the obvious, but I can't think of a way that the neutral could NORMALLY carry that much current under the load conditions he described.
I would say it is NOT normal for the OP's neutral to carry that much current.