dnk you are right it's just a preference thing and by all means do what makes you happy.
We should have 20a on the nuetral? no biggie so far. However, with laser printers, power supplies, copiers ect. introducing harmonic currents on the nuetral also, you see we could be taking chances with the nuetral becoming overloaded.
1) What is 12 AWG rated at 75 C?
2) Many times the cables we use are super neutral.
Now lets for fun do this for a whole commercial building for todays electronic equipment. We start to have problems.
Perhaps, but the use of multiwire or two wire circuits only deals with the branch circuits.
All the panels and feeders will be subjected to the same amount of harmonics using multiwire or two wire circuits.
It is common in the buildings we wire that all the 208 neutrals, including the panelboard neutral bars will be 200% of the phase conductors.
All that said, I agree with Don, harmonic currents are not new, they existed before PCs came along. The only new thing is
need to fix the problem.
