How to determine amp rating ?

[lincpimp]

As said above, this is what you really need to drive home:

Some arbitary amp rating for any given motor is just about useless for the purpose of comparing a motor to another motor, or even providing any info about the motor at all.

That amp rating could be read just before the motor melts, or with it running for an hour at 1/10th load with a 40ton a/c system blowing over it. Without any other info the amp rating is useless....