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Plastic electrical boxes with knockouts.
Figure 1 plastic electrical box showing cable knockouts.
Also many plastic boxes have doors that act as clamps to hold the electrical cable to the box eliminating the need for additional clamps.
These tabs serve their purpose but we d much rather have a wire connector or a metal clamp with a screw and tighten the tension to hold the wires in place.
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The plastic boxes sometimes have plastic push in tabs to hold the nonmetallic sheathed nm wire.
In your case if you have old fabric covered cable you really should be using boxes with a 1 2 screw type cable clamp.
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The cable which would be clamped in position if it was a metal box floats freely in the hole created by the knockout and is held in place by the staple or wire clamp that according to electrical code must be placed on the wire within 8 inches of the electrical box.
In this case however this box has knockouts to remove with no fastener for the wires.
This home depot guide helps you to.
Rather they are kinda like trap doors and some pressure against the nm cable helps keep it from slipping back out of the box.
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If knockouts are out only in single gang boxes only in holes filled with cable and stapled you should be ok.
For one home improvement centers tend to favor plastic boxes.
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Protect your family with safe electrical boxes.
The knockouts on plastic boxes are not designed to be removed completely.
A combination of an outlet box cord and duct these outlet strips minimize tripping hazards and protect the cord from damage.
A knock out or ko is a partially stamped opening in electrical enclosures that allows quick entry of a wire cable or pipe via connector or fitting to the interior.
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The code 314 17 allows cables without clamps on smaller single gang boxes if the cables are stapled within 8 inches of the box.
For another plastic boxes are lighter their edges are softer and their holes are easier to knock out.
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Bench top outlet strips mount these outlet strips to a desktop or workbench with the mounting hardware or set them on a surface.
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