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?
Electrical – Connectors on wires entering a plastic box
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Related Solutions
What you see is very common, no RX connector. I think you will find that a common $0.50 3/4 inch romex (NM) connector will screw directly into the treads of the knock out.
Simply remove the tork nut and thread the connector into the box hole threads. This will work fine with the back hole since your going to seal the box to the wall with silicon. If you were to use the side, top or bottom knock outs, or not otherwise give the opening a water tight seal, you would have to use water tight connectors for the wire size.( rubber insert for 12/2, 14/2 UF/NM Etc.
Yes, there are connectors that can be slipped onto the cable and popped into place in the panel knockout. They do not snap over the cable though, you must disconnect the wires and slide the connector over them.
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Best Answer
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.