I'm somewhat confused on when Baruch Hu Uvaruch Shemo (ברוך הוא וברוך שמו) should be said after Hashem's name in a B'racha (I'm taking for granted that it is only said in the context of a bracha, but correct me if I'm wrong), and when it shouldn't.
There appear to be certain times where everyone in the synagogue says it:
- The B'rachos that are said in the morning
- The Chazzan's recitation of Shemoneh Esrei
On the other hand, there appear to be sometimes where no one says it:
- When being yotzei a Bracha
But then there are some "grey areas" where it appears that only some of the congregants do say it, and some remain silent:
- Friday night, by the B'racha mein Sheva
- Hashem's name in Birchas Kohanim
[there are probably lots more examples; these just happen to be the ones that prompted my question]
In short: I'm looking for a rule: when is it said, and when isn't it?