With the right information and technique you should be able to remove a ko from electrical panels and other electrical enclosures without any problems.
Plastic electrical boxes with knockouts.
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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.
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The plastic boxes sometimes have plastic push in tabs to hold the nonmetallic sheathed nm wire.
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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.
The code 314 17 allows cables without clamps on smaller single gang boxes if the cables are stapled within 8 inches of the box.
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A combination of an outlet box cord and duct these outlet strips minimize tripping hazards and protect the cord from damage.
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This home depot guide helps you to choose the ideal electrical box for your home wiring project.
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.
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In your case if you have old fabric covered cable you really should be using boxes with a 1 2 screw type cable clamp.
In this case however this box has knockouts to remove with no fastener for the wires.
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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Rather they are kinda like trap doors and some pressure against the nm cable helps keep it from slipping back out of the box.
For one home improvement centers tend to favor plastic boxes.
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For another plastic boxes are lighter their edges are softer and their holes are easier to knock out.
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This home depot guide helps you to.
Also many plastic boxes have doors that act as clamps to hold the electrical cable to the box eliminating the need for additional clamps.