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how to know the ampere rating of cable and wire?
You need to consult the standards which are applicable to whereabouts in the world you are. Most countries have their own codes which differ subtly or otherwise with every other country, and so there are no hard and fast rules.
http://cr4.globalspec.com/search/sitesearch?do=show&sort=textmatchrank&srch=Wire%20and%20Cable%20Amp%20Ratings&srchobjs=t%2Cc&fs=12&order=asc
http://cr4.globalspec.com/search/sitesearch?do=show&sort=textmatchrank&srch=cable%20sizing&order=asc