The general guidance if you are writing for amateurs is to stop the tenor and soprano sections at their respective "high G" and if you are writing for professio

The general guidance if you are writing for amateurs is to stop the tenor and soprano sections at their respective "high G" and if you are writing for professionals to avoid going above their B. Amateur choirs will often sing music written for professionals (eg all the masterworks), and you will end up getting A's or Bb's but without expectations that it will sound good.