[albrewer]

If you don't own or didn't use a torque wrench to tighten the connections and this was awhile ago, I would go and re-torque them. Properly connecting these types of connections requires more technique than "give it five ugga duggas and it'll never move." Not saying that's what you did, but still, re-check :)

[dsfyu404ed]

How many electricians do you see using a torque wrench?

[bdcravens]

It's code to do so as of NEC 2017.

[Kirby64]

Only if the outlet provides torque specs with its instructions. If there's no specification, torquing isn't required. Stupid 'workaround', but most outlets likely do not have torque requirements.

[bdcravens]

Correct, though when I put the 240 in my garage, both the outlet and breaker had torque specs.

[bdcravens]

When I put my plug in, I did this. Torque screwdrivers are $30 on Amazon (hint: look for the ones that are used for firearms)