is comma required prior to because
The short answer is no. Itâs unusual to put a comma before because. You only do it when you need the comma to prevent confusion because your sentence could have two meanings. The Chicago Manual of Style has an excellent entry on this topic in its Q&A section online. It gives the example.
Guide to Comma Use. Learning when to and when not to use commas is a difficult and sometimes overwhelming task for many writers, but it is absolutely essential because commas are signals that tell readers which words need to be separated from each other or which words are not essential to the basic grammar of a sentence.