The salary cap in Leagues 1 and 2 is how FFP works at those levels. From memory it is 60% of turnover in League 1 and 55% in League 2.
The Premier League operate a voluntary salary cap, but it is a sham. The clubs are only allowed to increase their wages by a set percentage each season ensuring that those that spend most will always be able to do so.
And for us, we pretty much have one anyway as things are anyway.