2/0 on a 200 amp???...maybe there's your problem.. anti-ox is not a code requirement. not sure oxidation would cause wire to burn up until its real bad, usually a loose or poor connection will burn up.
The 2/0 is the neutral conductor.....no problem.
anti-oxident is acually required per 110.14....
I know it says where employed and this is a well debated topic. But it is required, if you look at the specifications from all wire manufactures they say to use anti oxident thus we are required to install according to manufactures instructions.
I think this was a clear example of anti oxident vs no anti-oxident.
But how come inside the panel, the neutral lug was overheating...when the weak point was the line side neutral in the meter?
Just wondering what you guys think, seen, know, feel, beleive could be the cause of this problem.