I brought a 14/3 U/F cable into a single plastic nail-on box, through a hole that I drilled through the back of the box. Do I need a connector on that wire, and if so what would you recommend a black button Romex connector backwards?

  • What size hole did you drill? Commented Sep 1, 2020 at 3:31
  • I could easy fit a 3/4 or one inch black button romex connector on backwords but isk if thats cool Commented Sep 1, 2020 at 4:20
  • but why backwards?
    – Jasen
    Commented Sep 1, 2020 at 5:41
  • 1
    @isherwood For some reason the industry refers to cable clamps as "connectors". That would be like referring to your car's shocks as a "carburetor" but whatever. Commented Sep 1, 2020 at 15:50
  • 1
    @D.M.Electricprotectyatech -- just tell us the size of the hole you put in the box and we'll go from there :) Commented Sep 1, 2020 at 23:46

1 Answer 1


I have used listed clamps on construction boxes but black button connector is a device like an “insider” plastic clamp it is only listed for 1 direction. Mechanical 2 screw clamps can be installed with the screws on the inside or outside. On plastic boxes if you have a bushing to protect the insulation the staple needs to be within 8” not all plastic boxes have clamps but if you drill a hole it will require protection for the wire at a minimum. I would say based on that it doesn’t matter but if the instructions for your clamp provide a direction the inspector can flag it.

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