Sparkmaster.
You can not determine the rating of a transformer by measuring the wire size. 310.16 in the NEC means absolutely nothing to the manufacturers of transformers.
I have to guess these are fairly small transformers if they have leads on them.
It is most unusual to not have a name tag of some sorts so I am also going to guess that these are some sort of used / old transformers.
What do they look like?
Where are the leads?
Where did they come from?
Basically if they are not marked you can not install them.
