http://www.unc.edu/depts/wcweb/handouts/commas.html"]COMMAS[/url], and if you google the word, you'll find a lot of sites with more information and examples.
'Because' normally introduces a dependent clause, and dependent clauses are normally restrictive, hence taking no comma. When sentences and their clauses get too long, however, a comma may be necessary for clarity.
Hope this helps.
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I came across the following example on the internet, which neatly demonstrates why you often need to think about the contents of your statement before you decide:
I knew that President Nixon would resign that morning because my sister worked in the White House and she called me with the news.
Without the comma, the sentence might suggest that President Nixon resigned because my sister worked in the White House.
On the other hand, we must assume at least a little intelligence and common sense in the reader.
No reasonable person would ever think Nixon was going to resign because someone's sister worked in the White House, for heaven's sake!
(Nevertheless, I do agree that the comma helps in this case.)
The reason a comma is not used before "because" is because the subject of this sentence is "I knew", not "President Nixon would resign that morning"
To explain ...
What this sentence is really saying is I knew that 'insert information' because my sister worked in the White House, and she called me with the news. You can clearly see in this case that you would not place a comma before "because." However, in both cases there should be a comma after house as she called me with the news is an independent clause.
The very use of "because" dictates that the following clause will be sub-ordinated in every case, and sub-ordinated clauses are not separated by commas.
I hope I have explained this well enough to clarify your confusion. In short, never use a comma before because*.
*Disclaimer unless the writer is being 'creative' and knows the rules he/she is breaking
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