Originally Posted by
John Steinke
That truly does look like the wrong sort of connector. Even the 2-screw MC/NM connectors that are rated for flexible cords assume a round cord - no the flat one shown.
And that's not "even the 2-screw" type.
That looks like a specialty made cord clamp.
Look at the size and shape of the cord and the size and shape of the opening in the clamp. They match.