Nonmetallic or nm cable commonly known by the brand name romex must be secured to electrical boxes at the point where the cable enters the box.
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However you do not need to secure the nm or romex wire inside the plastic box.
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There are standard metal clamps and push in plastic clamps.
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Basics of plastic electrical box holders.
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Many boxes have internal clamps already present but if a box has no means for clamping you must use a clamp that mounts to the box through one of the knockout holes in the box.
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This code requirement is an important safety feature that protects the wiring connections inside the box in case the cable is pulled.
Eliminate the need to drive a new ground rod these clamps connect grounding wire to an existing flat grounding surface such as the lid of an electric meter box.
Installation is quick and easy with a push and snap in design that does not require the use of locknuts or screws.
Electrical cables typically must be secured to boxes with approved cable clamps.
The idea is that you staple on a solid surface the stud 8 inches or nearer to the outside of the box.
Securing electric cable in the box is good practice and it makes for a safer installation.