clamps for nm-b cable in metal boxes After looking at the comments, the real problem isn't the knockout, it's a clamp that will work with access only to the inside of the box. Luckily, this is a solved problem. There are plastic push-in NM connectors made to install inside the box, such as the Raco Insider:
$27.55
0 · nm cable to panel box
1 · nm cable for metal box
2 · nm cable for electrical box
3 · nm cable clamps
4 · nm box cable clamps
5 · metal box nm cable attachment
6 · metal box cable clamps
7 · clamps for nm boxes
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This is usually accomplished by installation of an NM-connector at the knockout that is secured to the box from both sides and clamps down on the cable. Most NM-connectors are approved for . Orient the clamp so the saddle screws are facing you. This makes it easy to tighten the screws when installing the cable. You can also secure the clamp onto the cable first, then install the cable and clamp into the metal box.
This is usually accomplished by installation of an NM-connector at the knockout that is secured to the box from both sides and clamps down on the cable. Most NM-connectors are approved for securing only one or two cables, but there are connectors listed to handle even more.Twin Screw Non-Metallic Cable Clamp Connectors to join non-metallic sheathed cable and flexible cord to steel outlet boxes or other metal enclosures. A reversible locknut cuts through protective coatings on boxes and enclosures to preserve grounding. You also want to look at 314.17(C) Exception for single gang plastic boxes without an integral clamp. That section requires the NM cable to be fastened within 8" of a single gang plastic box without a cable clamp. After looking at the comments, the real problem isn't the knockout, it's a clamp that will work with access only to the inside of the box. Luckily, this is a solved problem. There are plastic push-in NM connectors made to install inside the box, such as the Raco Insider:
You have to attach cables to the box. Doesn't say which type of clamp to use only that the cable must be attached to the box. Subsection (A) also indicates where conductors enter a box shall be closed in an appropriate manner.
You'll need a 3/4" snap-in NM clamp that can be installed from the inside of the box. You do need a NM clamp (vs a mere bushing) here, first off; a simple bushing does not provide the clamping of the cable jacket required by NEC 312.5(C) for . Where flexible tubing is used to enclose the conductors, the tubing shall extend from the last insulating support to not less than 6 mm (? in.) inside the box and beyond any cable clamp.
Screw in two hole clamp in the weatherproof box (assuming you are coming in the back. Plastic snap-in nm holder for the metal box. Install the romex into the outdoor box, tighten clamp. Feed the romex into the interior box until tight, .
is there a requirement for a clamp where the NM enters a box? or is the requirement that it be secured within 12 inches of the box.
Orient the clamp so the saddle screws are facing you. This makes it easy to tighten the screws when installing the cable. You can also secure the clamp onto the cable first, then install the cable and clamp into the metal box.This is usually accomplished by installation of an NM-connector at the knockout that is secured to the box from both sides and clamps down on the cable. Most NM-connectors are approved for securing only one or two cables, but there are connectors listed to handle even more.
Twin Screw Non-Metallic Cable Clamp Connectors to join non-metallic sheathed cable and flexible cord to steel outlet boxes or other metal enclosures. A reversible locknut cuts through protective coatings on boxes and enclosures to preserve grounding. You also want to look at 314.17(C) Exception for single gang plastic boxes without an integral clamp. That section requires the NM cable to be fastened within 8" of a single gang plastic box without a cable clamp.
After looking at the comments, the real problem isn't the knockout, it's a clamp that will work with access only to the inside of the box. Luckily, this is a solved problem. There are plastic push-in NM connectors made to install inside the box, such as the Raco Insider: You have to attach cables to the box. Doesn't say which type of clamp to use only that the cable must be attached to the box. Subsection (A) also indicates where conductors enter a box shall be closed in an appropriate manner.
You'll need a 3/4" snap-in NM clamp that can be installed from the inside of the box. You do need a NM clamp (vs a mere bushing) here, first off; a simple bushing does not provide the clamping of the cable jacket required by NEC 312.5(C) for . Where flexible tubing is used to enclose the conductors, the tubing shall extend from the last insulating support to not less than 6 mm (? in.) inside the box and beyond any cable clamp. Screw in two hole clamp in the weatherproof box (assuming you are coming in the back. Plastic snap-in nm holder for the metal box. Install the romex into the outdoor box, tighten clamp. Feed the romex into the interior box until tight, .
nm cable to panel box
nm cable for metal box
Most frequently, expensive sheet metal bending tools, called brakes, are used to bend sheet metal, but you can also complete this task without one. Bending sheet metal by hand is a manageable task if the piece of sheet metal is small and thin enough to handle.
clamps for nm-b cable in metal boxes|nm cable to panel box