{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "device-boxes-us",
 "name": "US PVC device boxes (Carlon, Allied Moulded): size, cubic inches, device screw spacing",
 "kind": "standard",
 "category": "Home & kitchen",
 "group": "Household",
 "year": null,
 "question": "What are the dimensions and device screw spacing of a US single gang, two gang or old work electrical box?",
 "tags": [
  "electrical box",
  "outlet box",
  "switch box",
  "old work box",
  "new work box",
  "pvc",
  "device box",
  "nec",
  "box extender",
  "tote"
 ],
 "aliases": [
  "single gang box dimensions",
  "old work box cutout size",
  "carlon b120r dimensions",
  "carlon b114r dimensions",
  "2 gang box dimensions",
  "3 gang box dimensions",
  "electrical box screw spacing",
  "outlet box 3-9/32 screw spacing",
  "box extender dimensions",
  "smart switch adapter plate",
  "switch box depth",
  "old work box stl"
 ],
 "overall_mm": {
  "length": 108.7,
  "width": 25.4,
  "height": 2
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": false,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/device-boxes-us/",
 "sheet_txt": "https://xemstudio.com/objects/device-boxes-us/sheet.txt",
 "sheet": {
  "basis": "Maker catalog data (ABB Carlon, Allied Moulded) and Arrow Hart wallplate catalog; only printed numbers",
  "overall_mm": {
   "length": 108.7,
   "width": 25.4,
   "height": 2
  },
  "notes": [
   "US nonmetallic (PVC / fibreglass) device boxes, new work and old work: the sizes the makers print, the cubic-inch capacity as marked on the box, and the one position that every device box shares: the device mounting screws, 3-9/32 in apart.",
   "Sizes are length x width x depth as the maker's catalog data prints them. The data does not say whether an old work box length includes its ears or swing clamps, and two-gang boxes are listed with the long side in different columns, so measure your own box before you cut a wall or print a spacer.",
   "No drywall cutout is published as a number. Allied says to use its template (1/16 in clearance round the box) or to trace the box; Xem does not guess a cutout from the listed outline.",
   "The three template files carry what is printed: #6-32 device screw holes (0.138 in major diameter) 3-9/32 in apart at a 46.0 mm gang pitch. They are a design aid for a spacer, extender or smart-switch adapter plate, not a box: box interior, wall thickness and radii are not printed.",
   "Box fill: the cubic inches are as marked by the maker (NEC 314.16 sets the fill rules; this page does not restate them)."
  ],
  "table": {
   "columns": [
    "parameter",
    "value"
   ],
   "rows": [
    [
     "Carlon B114R-UPC old work, 1-gang",
     "14 cu in; 4-1/8 x 2-1/4 x 2-3/4 in (L x W x D)"
    ],
    [
     "Carlon B120R old work, 1-gang",
     "20 cu in; 4-1/8 x 2-15/16 x 3-5/8 in"
    ],
    [
     "Carlon B225R-UPC old work, 2-gang",
     "25 cu in; 3-15/16 x 3-1/8 x 2-3/4 in"
    ],
    [
     "Carlon BH234R old work, 2-gang",
     "34 cu in; 4.3 x 4.36 x 3.59 in"
    ],
    [
     "Carlon B355R old work, 3-gang",
     "55 cu in; 5.72 x 2.79 x 3.69 in"
    ],
    [
     "Carlon B232BR new work, 2-gang",
     "32 cu in; 3-3/4 x 4 x 3 in"
    ],
    [
     "Allied Moulded 9312-E series old work, 2-gang",
     "28.0 cu in; depth 2-3/4, width 4-1/8, height 3-1/4 in"
    ],
    [
     "Allied Moulded 9329-EW series old work, 2-gang",
     "32.5 cu in; depth 3-1/4, width 4-1/8, height 3-1/4 in"
    ],
    [
     "Allied Moulded 9363-EWK old work, 1-gang",
     "16 cu in; 2-3/8 x 3-1/4 x 2-7/8 in (width x height x depth)"
    ],
    [
     "device mounting screws (all gangs)",
     "3-9/32 in (83.3 mm) apart, one pair per device; #6-32 machine screws"
    ],
    [
     "gang pitch (device centre to centre)",
     "46.0 mm (1.81 in), from the wall plate catalog"
    ],
    [
     "Allied old work cutout rule",
     "template 1TP (1-gang) or 2TP (2-gang) leaves 1/16 in clearance round the box; or trace the box, stopping at the ears"
    ],
    [
     "Allied old work ear screws",
     "two #8 sheet metal screws, at least 3/4 in long, one at each end of the box"
    ],
    [
     "wall thickness, radii, ear and clamp positions, cutout sizes",
     "not printed as numbers: not modelled"
    ]
   ]
  }
 },
 "sheet_text": "US PVC device boxes (Carlon, Allied Moulded): size, cubic inches, device screw spacing — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/device-boxes-us/  (sheet CC BY 4.0)\nBasis: Maker catalog data (ABB Carlon, Allied Moulded) and Arrow Hart wallplate catalog; only printed numbers\nCatalog version: 2026-10-20\n\nOverall (mm): length 108.7, width 25.4, height 2.0\n- US nonmetallic (PVC / fibreglass) device boxes, new work and old work: the sizes the makers print, the cubic-inch capacity as marked on the box, and the one position that every device box shares: the device mounting screws, 3-9/32 in apart.\n- Sizes are length x width x depth as the maker's catalog data prints them. The data does not say whether an old work box length includes its ears or swing clamps, and two-gang boxes are listed with the long side in different columns, so measure your own box before you cut a wall or print a spacer.\n- No drywall cutout is published as a number. Allied says to use its template (1/16 in clearance round the box) or to trace the box; Xem does not guess a cutout from the listed outline.\n- The three template files carry what is printed: #6-32 device screw holes (0.138 in major diameter) 3-9/32 in apart at a 46.0 mm gang pitch. They are a design aid for a spacer, extender or smart-switch adapter plate, not a box: box interior, wall thickness and radii are not printed.\n- Box fill: the cubic inches are as marked by the maker (NEC 314.16 sets the fill rules; this page does not restate them).\n\nparameter  value\nCarlon B114R-UPC old work, 1-gang  14 cu in; 4-1/8 x 2-1/4 x 2-3/4 in (L x W x D)\nCarlon B120R old work, 1-gang  20 cu in; 4-1/8 x 2-15/16 x 3-5/8 in\nCarlon B225R-UPC old work, 2-gang  25 cu in; 3-15/16 x 3-1/8 x 2-3/4 in\nCarlon BH234R old work, 2-gang  34 cu in; 4.3 x 4.36 x 3.59 in\nCarlon B355R old work, 3-gang  55 cu in; 5.72 x 2.79 x 3.69 in\nCarlon B232BR new work, 2-gang  32 cu in; 3-3/4 x 4 x 3 in\nAllied Moulded 9312-E series old work, 2-gang  28.0 cu in; depth 2-3/4, width 4-1/8, height 3-1/4 in\nAllied Moulded 9329-EW series old work, 2-gang  32.5 cu in; depth 3-1/4, width 4-1/8, height 3-1/4 in\nAllied Moulded 9363-EWK old work, 1-gang  16 cu in; 2-3/8 x 3-1/4 x 2-7/8 in (width x height x depth)\ndevice mounting screws (all gangs)  3-9/32 in (83.3 mm) apart, one pair per device; #6-32 machine screws\ngang pitch (device centre to centre)  46.0 mm (1.81 in), from the wall plate catalog\nAllied old work cutout rule  template 1TP (1-gang) or 2TP (2-gang) leaves 1/16 in clearance round the box; or trace the box, stopping at the ears\nAllied old work ear screws  two #8 sheet metal screws, at least 3/4 in long, one at each end of the box\nwall thickness, radii, ear and clamp positions, cutout sizes  not printed as numbers: not modelled\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- ABB (Carlon): B120R 1-gang old work box, catalog data (4-1/8 x 2-15/16 x 3-5/8 in, 20 cu in) — web — Publisher's page; dimensions are facts — https://empower.abb.com/ecatalog/ec/EN_NA/p/B120R\n- G.T. Sanders (ABB Carlon data): B114R-UPC old work box (14 cu in, 4-1/8 x 2-1/4 x 2-3/4 in) — web — Publisher's page; dimensions are facts — https://www.gtsanders.com/Product/B114R\n- Stoneway Electric (ABB Carlon data): B225R-UPC old work box (25 cu in, 3-15/16 x 3-1/8 x 2-3/4 in) — web — Publisher's page; dimensions are facts — https://www.stoneway.com/product/96915/Shared.ContactForPricing.ContactLink\n- Stoneway Electric (ABB Carlon data): BH234R old work box (34 cu in, 4.3 x 4.36 x 3.59 in) — web — Publisher's page; dimensions are facts — https://www.stoneway.com/product/1440/Shared.ContactForPricing.ContactLink\n- Crescent Electric (ABB Carlon data): B355R 3-gang old work box (55 cu in, 5.72 x 2.79 x 3.69 in) — web — Publisher's page; dimensions are facts — https://crescentelectric.com/electrical-boxes/outlet-boxes/three-gang-old-work-outlet-box-volume-55-cubic-inches-length-572-inches-width-279-inches-depth-369-inches-color-blue-material-pvc-mounting-means-mounting-ears-and-two-swing-clamps\n- Stoneway Electric (ABB Carlon data): B232BR new work 2-gang box (32 cu in, 3-3/4 x 4 x 3 in) — web — Publisher's page; dimensions are facts — https://www.stoneway.com/product/815079/Shared.ContactForPricing.ContactLink\n- Allied Moulded (via Elliott Electric): Old work box catalog sheet 9312/9329 series: cubic inches, depths, cutout rule (box plus 1/16 in), screws — web — Publisher's page; dimensions are facts — https://static.elliottelectric.com/Media/9329EWK-ALM\n- Stoneway Electric (Allied Moulded data): 9363-EWK old work box (16 cu in, 2-3/8 x 3-1/4 x 2-7/8 in) — web — Publisher's page; dimensions are facts — https://www.stoneway.com/ALLIED-MOULDED-PRODUCTS-9363-EWK-Allied-Moulded-9363-EWK-1-Gang-Switch-Receptacle-Outlet-Box-2-7-8-Inch-Depth-Thermoset-Fiberglass-Reinforced-Polyester-16-Cubic-Inch-Beige-Tan/p2288283\n- Arrow Hart / Hubbell Wiring (via Elliott Electric): Wallplate Dimensional Information, catalog pages J-2 and J-3 (gang pitch 46.0 mm, strap spacing 83.3 mm) — web — Publisher's page; dimensions are facts — https://www2.elliottelectric.com/Media/68-EWD-1045-1-Other\n\nNo true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.\nAPI: https://xemstudio.com/api/geometry?object=device-boxes-us\n",
 "sources": [
  {
   "publisher": "ABB (Carlon)",
   "title": "B120R 1-gang old work box, catalog data (4-1/8 x 2-15/16 x 3-5/8 in, 20 cu in)",
   "url": "https://empower.abb.com/ecatalog/ec/EN_NA/p/B120R",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "G.T. Sanders (ABB Carlon data)",
   "title": "B114R-UPC old work box (14 cu in, 4-1/8 x 2-1/4 x 2-3/4 in)",
   "url": "https://www.gtsanders.com/Product/B114R",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Stoneway Electric (ABB Carlon data)",
   "title": "B225R-UPC old work box (25 cu in, 3-15/16 x 3-1/8 x 2-3/4 in)",
   "url": "https://www.stoneway.com/product/96915/Shared.ContactForPricing.ContactLink",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Stoneway Electric (ABB Carlon data)",
   "title": "BH234R old work box (34 cu in, 4.3 x 4.36 x 3.59 in)",
   "url": "https://www.stoneway.com/product/1440/Shared.ContactForPricing.ContactLink",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Crescent Electric (ABB Carlon data)",
   "title": "B355R 3-gang old work box (55 cu in, 5.72 x 2.79 x 3.69 in)",
   "url": "https://crescentelectric.com/electrical-boxes/outlet-boxes/three-gang-old-work-outlet-box-volume-55-cubic-inches-length-572-inches-width-279-inches-depth-369-inches-color-blue-material-pvc-mounting-means-mounting-ears-and-two-swing-clamps",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Stoneway Electric (ABB Carlon data)",
   "title": "B232BR new work 2-gang box (32 cu in, 3-3/4 x 4 x 3 in)",
   "url": "https://www.stoneway.com/product/815079/Shared.ContactForPricing.ContactLink",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Allied Moulded (via Elliott Electric)",
   "title": "Old work box catalog sheet 9312/9329 series: cubic inches, depths, cutout rule (box plus 1/16 in), screws",
   "url": "https://static.elliottelectric.com/Media/9329EWK-ALM",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Stoneway Electric (Allied Moulded data)",
   "title": "9363-EWK old work box (16 cu in, 2-3/8 x 3-1/4 x 2-7/8 in)",
   "url": "https://www.stoneway.com/ALLIED-MOULDED-PRODUCTS-9363-EWK-Allied-Moulded-9363-EWK-1-Gang-Switch-Receptacle-Outlet-Box-2-7-8-Inch-Depth-Thermoset-Fiberglass-Reinforced-Polyester-16-Cubic-Inch-Beige-Tan/p2288283",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Arrow Hart / Hubbell Wiring (via Elliott Electric)",
   "title": "Wallplate Dimensional Information, catalog pages J-2 and J-3 (gang pitch 46.0 mm, strap spacing 83.3 mm)",
   "url": "https://www2.elliottelectric.com/Media/68-EWD-1045-1-Other",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "wall-plate-toggle-us",
  "wall-plate-decora-us",
  "wall-plate-duplex-us",
  "plywood-and-drywall",
  "metal-boxes-us",
  "ceiling-boxes-us",
  "imperial-machine-screws"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn.",
 "mating": [],
 "faq": [
  {
   "q": "How far apart are the screws in a US switch or outlet box?",
   "a": "3-9/32 in (83.3 mm) between the two device mounting screws, #6-32."
  },
  {
   "q": "How big is a Carlon B120R?",
   "a": "Listed as 4-1/8 x 2-15/16 x 3-5/8 in, 20 cu in."
  },
  {
   "q": "What size hole do I cut for an old work box?",
   "a": "The makers do not print a number here: Allied leaves 1/16 in round the box and sells a template; trace your own box."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/device-boxes-us/index.md"
}