Maximum amps for power transmission = 0.92 and

Maximum amps for chassis wiring = 7

i am surprised what is actually 22 guage wire can bear in a transformer i mean is it 7 or 0.92

and if i used 12 guage wire for secondary then for it is it 41 amps or 9.3 amps

friends i really need a formula like for guage of primary wire , guage of secondary should be . i am not good in electronics . help me friends thanks