HD and Lowes is a crapshoot, that's why I ended up with plastic boxes in the first place. It is designed to cut through protective coatings on boxes and enclosures to assure ground continuity. This may be achieved by use of a switch with ground connection. 8. Anyone know a good place to buy deep new work 1-gang metal boxes with stud brackets? No. For instance, I have seen 2 romex cables in a single 2 screw 1/2" romex clamp fastened to a 4" square box, and also I have seen all load romex cables that leave a load center pass through a single 2 screw 2 1/2" romex clamp. NEC Table 370-16(a) for Metal Boxes: Number of Conductors in Outlet, Device, and Junction Boxes. Use to connect building cable for dry locations, also known as Romex type NM-B cable, to enclosures and outlet boxes by pushing these grips into a knockout.. For technical drawings and 3-D models, click on a part number. Box Dimension in Inches Trade Size or Type. IP: 63.204.201.214. 4 X 1-1/4 round or octagonal 4 X 1-1/2 round or octagonal 4 X 2-1/8 round or octagonal. Metal boxes are usually made of aluminum, steel or cast iron. Metal boxes can also be used with Romex or NM wiring if desired, though special precautions must be taken to ensure proper grounding. 6. The 1 in. No. Metal receptacle covers must be grounded, even on plastic boxes. Where is this information in the Code book? Metal electrical boxes are primarily used with metal-sheathed or "BX" wiring. For exposed or shop wiring, metal boxes are probably better. No. This video shows how to install a metal oldwork box using Madison clips. An insert clamps the cable in place and provides more strain relief than standard snap-in cord grips for building cable. To install this type of clamp, insert the threaded end into a knockout hole in the box, then thread on the locknut onto the threaded end from inside the box.Tighten the nut with pliers. Thanks all for your help and sorry for the confusion. No. Locknut is reversible. 16. Can one Romex (14/2 or 12/2) be installed in conduit (1/2" EMT) as a means of mechanical protection sleeve when it's run vertically on an exposed basement wall (concrete) in an unfinished basement with no studs, from the ceiling to plug height (12 inches)? However, they can also be used with Romex or NM wiring if desired. Insert the cable through the clamp saddle and into the box, and tighten the screws on the saddle to secure the cable. A chief distinction between BX and NM is that BX can achieve grounding through the outer metal casing. No. Contact between an attached device (such as a light switch or outlet) and the metal box completes the grounding contact. Into an 1110 box, for a single plug. 14. Twin-Screw Clamp Connector is designed to connect non-metallic sheathed cable and flexible cord to a steel outlet box or other metal enclosure. No. Minimum Capacity (in.3) Maximum Number of Conductors. 12. Click to see full answer Herein, how do you secure Romex in a metal box? Metal Boxes: Many local building codes require metal junction boxes because they are durable and ensure long-lasting performance. The boxes made without metal are PVC or plastic. Corrosion resistant. No. 10. This casing needs to be attached to metal boxes. Another distinction is that some types of BX cable can be installed in exposed locations, either indoors or outdoors. And where I'm trying to use metal clamps with romex in plastic boxes (per the photo), I will switch to plastic clamps . 18. Romex is one popular brand of NM electrical cable. Choose from many junction box sizes to find the one that best suits your project. in Ontario Canada, as per Ontario and Canadian code