![]() ![]() Where very thick wall finishes are used, it is important to have the contractor thinking about this very early in the construction process, as in some cases, it will be necessary to install extremely deep rough-in plates and in some cases deeper backboxes and this gets costly after the walls are rocked. to compensate for deep-seated boxes plaster compensation rings with same diameter can be stacked with 2 screws for attaching equipment and 2 ring attachment. ![]() This has to do with minimizing the possibilities that a fault in the box would catch the wall finish material on fire. 4' square box 4' square 1.5' deep plaster ring Masonry box (gangable) I have been installing these type boxes in finshed block jobs (kitchens, schools, industrial, etc.) for 30 years. This Electrical Box Extender works in 4-Inch square electrical boxes with plaster rings for single switches or receptacle. I have gone into a finished school and pulled off faceplates only to have to make the contractor remove hundreds of device plates and go back and install box extensions. Re: Electrical Boxes in block walls Steve as stated earlier a 4' sq (1900 box) box with a 1.5' plaster ring works as well as a standard masonry (tile) box. nVent CADDY All-in-One electrical assemblies combine the electrical box, support bracket, mud ring, far-side support and ground wire pigtail into a single solution that is ready to use right out of the box. Where thick wall finishes are used such as laminates, casework, bulletin boards, cloth covered wall panels, this 1/4" is measured from the face of the final finished surface to the box. The volume of a wiring enclosure (box) shall be the total volume of the assembled sections and, where used, the space provided by plaster rings, domed covers, extension rings, and so forth, that are marked with their volume or are made from boxes the dimensions of which are listed in Table 314.16(A). The general purpose of mud ring covers is to cover the mud temporarily before mounting electrical switches or receptacles. finished wall plates flush with interior drywall plaster or tile surfaces. Please be careful in that this includes any wall coverings. The volume of a wiring enclosure (box) shall be the total volume of the assembled sections and, where used, the space provided by plaster rings, domed covers, extension rings, and so forth, that are marked with their volume or are made from boxes the dimensions of which are listed in Table 314.16 (A). Multi-gang raised device covers are used when multiple electrical or low voltage. NEC requires that no more than 1/4" of combustible material be exposed between the faceplate and the backbox. ![]()
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