...LONDON (S&P Global Ratings) Aug. 9, 2017--S&P Global Ratings said today that it has raised South Africa national scale issue and issuer ratings on 15 corporate and infrastructure issuers. We affirmed the long-term South Africa national scale corporate credit rating on one issuer. The rating actions follow the recent publication of our revised mapping table for South Africa national scale ratings (see "S&P Global Ratings' National And Regional Scale Mapping Tables," published On July 27, 2017). At the same time, we removed the "under criteria observation" (UCO) designation from the national scale ratings. The mapping table applies to all entities and issues rated on the South Africa national scale. Such ratings carry the prefix 'za', as in 'zaBBB'. As explained in our national scale framework, to determine a national scale credit rating, we use criteria that are identical to, or consistent with, our global rating scale criteria. We typically first determine our view of creditworthiness on...