I have a 40-amp circuit that previously was used for the oven/range in my house, though I switched to gas so the circuit is no longer in use. If I wanted to install an L6-30r (30-amp receptacle) on this circuit is it sufficient to simply swap the breaker for a 30-amp and use the existing (appears to be 8AWG) wire? Second part of question, most L6-30r's that I'm finding note that they accept 14-10AWG wire, is this the norm and if so what other options would I have if I want to connect a device to this circuit with an L6-30p?
**Edit - I should have noted this would be a dedicated circuit, no other receptacles would be installed on it. The existing receptacle for the range/oven would be removed.