So when that provision went into effect all existing installations had to be updated immediately? I did not think the NEC worked that way.
Normally, you are correct. But this paragraph is a little different - it's a requirement for the type of receptacle that a machine can be plugged into. It's more of a maintenance item than an most of the NEC installation requirements. Most of these machines are serviced and repaired and refilled almost weekly. The maintenance guys options are to either install a GFCI on the plug, or plug it into a GFCI. There is no third option that it was fine when I got here, so I'll just leave it as is.
If it makes you feel better, I would say the new requirement didn't take effect immediately, but rather took effect the first time the vending machine was unplugged for service, and then plugged back in.
Wouldn't that depend on local rules? I don't think the term 'grandfathered' is even in the NEC.
True, if you can find someplace that hasn't adopted the 2005 NEC, or if they specifically exclude this paragraph, then I'll agree the GFI isn't necessary. Now that we know it might be 1000 machines, the vast majority, if not all, will fall under this requirement.
And you are correct, the term grandfathered isn't in the NEC. It is normally up to local jurisdictions to decide when new requirements take effect. All the more reason I wouldn't want to hang my hat on these being "grandfathered".
Putting the whole "grandfathered" item aside, if you are replacing 80% of the internal parts, IMO there is no question that it is remanufactured. You are basically keeping the shell.