How To Install A Old Work Electrical Box

Old Work Electrical Boxes
How to install an electric box into an existing wall or ceiling

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Installing an "erstwhile-piece of work" electrical box or receptacle refers to methods used to add a metal or plastic electrical box into an existing wall or ceiling without having to brand all-encompassing cuts into the building surfaces.

Here we describe types of onetime work electric boxes and devices used to secure those boxes in place safely.

This article series describes how to choose, locate, and wire an electrical receptacle in a habitation. Electrical receptacles (likewise called electrical outlets or "plugs" or "sockets") are unproblematic devices that are easy to install, only there are details to get right if you lot desire to be safe.

We likewise provide an ARTICLE Index for this topic, or you tin can try the page meridian or bottom SEARCH BOX as a quick way to detect information you need.

Choosing & Installing an Former Work Electrical Box

Examples of Former Work Electrical Boxes & Methods of Installation

When an electric circuit and electrical boxes are existence added to an existing structure wires are snaked through building cavities to the desired fixture location and an sometime-work electric box or "junction box" is installed to contain electric splices and devices.

Both metal and plastic sometime-work electric boxes are available and there is a diverseness of clips, clamps, and other devices used to secure electrical boxes in a wall or ceiling when the box cannot be conveniently nailed or screwed directly to the structure.

[Click to enlarge any image]

At in a higher place is a steel gang box with mounting hardware to permit former-work installation: those metal brackets at the top and bottom of the box can be screwed to a wall surface.

In my stance I'd adopt to run into this box used in a woods or paneled wall or on a plaster wall on wood lath rather than on simple drywall every bit I worry that in a receptacle installation someone may find they pull the whole installation off of the drywall when removing a wall plug.

Below we illustrate thin steel clips (colored orangish) that have been used (with considerable intendance) to secure a steel gang box in a drywall or plaster wall (adapted from Steel City products).

Calculation these clips tin can make the box far more secure in the wall than if we only use the brackets shown in the left and centre illustrations.

Here are two rectangular old-work switch or receptacle boxes.

Above left is a Carlon 25 cubic inch ii-gang plastic electrical box.

Only above is an old-work plastic Zippo Box suitable for a unmarried electrical switch or receptacle. The blue ear shown at the electric Zip Box top at right (orange pointer) is pulled confronting the interior surface of the wall plaster or drywall equally the installation screw (green pointer) is turned.

Beneath, using a Carlon round 81 cubic-inch oldwork box as an example, we evidence the mounting screws that cause the swing-clamps to open and then pinch the box against plaster or drywall through which the box has been mounted (ruby-red arrows).

The purple circle and smaller oval show us where the device-mounting screws (receptacle, switch, low-cal-weight lamp fixture subclass) volition be secured.

You can see that the three swing-clamps for this erstwhile work box are in the open position simply they'd exist moved to a closed position to insert the box through a round opening cut in drywall or plaster.

Spotter out: As we talk over at PLASTIC Electrical BOX REPAIR, the round blue Carlon electrical box at above correct includes a metal grounding lug shown in our larger purple circle.

This Carlon # B618RP-UPC is a four 1/four" diameter electrical box that has a UL 514C listing, meets NEMA OS-2, and is specifically indicated by the manufacturer equally non for fixture support in the ceiling.

That article illustrates a failure where this box was used to hang a ceiling low-cal fixture. The light began to fall out of the ceiling.

Beneath is another old-work plastic electrical box being installed in a ceiling.

Shown above, the rotating swing-clamps on the plastic one-time piece of work box are open up for illustration (yellow arrow).

The swing clamps are pressed flat confronting the box sides (cherry-red arrow at above right) equally it is pushed through its mounting pigsty into the ceiling or wall crenel.

As the box mounting screws (green pointer) are turned the plastic ears rotate open and and then are pulled tight against the drywall or plaster ceiling or wall surfaces, pulling the old piece of work electric box flange against the exposed side of the ceiling or wall and holding it in place.

In new structure an old-work box may be also needed if the electrician is asked to leave a wire exposed for future installation of fixture whose precise location has not been determined. In this instance she may leave the wire protruding through a ceiling or wall and may plan on later re-locating the wire precisely using an onetime piece of work retrofit type electrical box.

Come across PLASTIC Electric BOX REPAIR for an example of selecting and installing an old work electrical box to ability a ceiling-mounted calorie-free fixture

Spotter out: do non rely on onetime piece of work boxes with minimal support (simply drywall, for case) to carry heavier fixtures or ones subject area to vibration or movement such equally a ceiling fan. Such installations are unsafe.

Question: when were "Madison Confined" first used to install old work electrical boxes?

Ken The Former House Guy said:

Hi. My electrician establish Madison Bars in my house. Practice you know when they began being used in homes? - 2022/04/24

This Q&A were posted originally at ALUMINUM WIRING REPAIR FIELD NOTES

[Click to enlarge any image]

Moderator reply: 1967 or afterward

Hi OHG, and thanks for a helpful question.

The earliest simplified flat steel electric box mounting clip or "F" prune patents I've found (and then far - at that place may be before versions) in the U.Due south. are from the 1950s, such equally Shepard's "Wall Outlet Box Mounting" cited at the link I'll give beneath.

IF your electrical box supports are actually a Madison Electric Visitor production, then, while the history of the Madison Electric Company extends back to 1914, the first official use of that name was in 1957, so it's not likely that your "Madison Confined" are older than that.

Most-likely, if your old work electrical box is mounted using the very simple, thin metallic folded box supports shown beneath and so that production is probably from 1960s, as Madison patented an electrical box support in 1967 (cited beneath).

Run across Albrecht, David B. Electrical BOX SUPPORT [PDF] U.S. Patent 3,337,168, issued August 22, 1967.

Of course there volition be additional clues that can give the historic period of the installation, such as the historic period and type of electrical wiring, device, and wiring connectors.

See more than electrical system aging details

at ELECTRICAL COMPONENTS, AGE, TYPES

A much earlier but more than-circuitous flat steel box support is described in

Seckinger, George D. "Outlet box hanger." U.S. Patent 2,032,636, issued March 3, 1936.

More examples of "Madison Bars" - thin apartment metal strips used to install an electrical box into a wall cavity through an opening cut just almost the size of the electric box itself, are shown below on this page.

Types of Old Piece of work Electrical Box Mounts

These box mounting strips permit mounting an electric box in a wall without having to secure the box to a wall stud. These clips may be used with standard steel electrical boxes that include plaster ears.

The plaster ears are necessary to provide a back up confronting the exterior wall surface, against-which the "Madison Bars" or "Grip-Lok" or like sparse metallic strips will be pulled to apply a counter force.

Synonyms for Old Work Box Support clips & mounts

• F-Clips
• F-Straps
• F-type Clips
• Swing-Ear Box Back up
• Madison bars
• Old Work Box Clips
• Old Work Clips
• Old Work Box Mounting Clips
• Erstwhile Work Box Support

Procedure for Adding an Erstwhile Work Electrical Box in a Wall

Analogy, adapted from Caddy's Quondam Work Box installation sheet cited below. [Click to enlarge any image]

Watch out: if you lot are non trained & qualified to perform electrical work you lot should not endeavor it as yous can cause a edifice fire or you lot may be shocked or killed. Hire a licensed electrician.

1. Select the location & make the box cutout opening.

   Using the new electrical box as a template, scribe and so cut an opening in the wall where the electrical box is to exist installed.

2. Serpent the require electrical wire(south) to or through that wall opening, bringing the ends of the wires out of the wall opening and into the electrical box - usually a metal box, through an appropriate strain relief screwed to the box tiptop or bottom.
3. Connect the electric wires to the electrical box

   Tip

   : having installed quite a few electrical boxes using "Madison Bars" or the Caddy(C) Old work box mountain system, I note that you will pretty much e'er have to cut a notch at the acme or bottom of the wall opening in order to re-insert the box, at present with wires, back into the wall cavity, passing the metal strain relief through the opening along with the box.

   Equally long equally yous proceed the total opening size smaller than that which can be covered by the switchplate or receptacle box embrace plate, the larger opening won't be a cosmetic issue.

Accept a look at this metal box with BX wiring shown to a higher place: you will need a fleck of a notch to re-insert this box into the wall cutout in an "old piece of work box" installation.

4. Insert the electric box into the wall cutout, tipping it to first insert the strain-relief that holds the electrical wire to the box.

   Tip

   : having installed quite a few electrical boxes using "Madison Bars" or the Caddy(C) Old work box mount system, I notation that y'all will pretty much always have to cut a notch at the pinnacle or bottom of the wall opening in guild to re-insert the box, at present with wires, back into the wall cavity, passing the metallic strain relief through the opening forth with the box.

   As long as you proceed the total opening size smaller than that which can be covered by the switchplate or receptacle box embrace plate, the larger opening won't be a corrective issue.

5. Install the mounting clips or expanding spiral prune equally directed by the manufacturer.

   Typically, every bit Caddy'southward Old Piece of work Box instructions testify here, a flat mounting clip is inserted alongside the exterior of the electric box, maneuvered into position, the in-wall-cavity arm is pulled tight against the inner surface of the plaster or drywall, and the thin metal tab is and then bent-over the edges of the metal box and folded tightly against the box sides.

   Watch out: the metal tab that is folded into the electrical box must be tight against the box sides so as not to leap out and contact a live electrical terminal such as are exposed on the sides of an electrical receptacle - lest you take a expressionless brusk!

   Tip:

   I employ my lineman's plies to pinch the old work box clip tab tightly against the sides of the electrical box.

An alternative to sometime work electric box clips is to use the newer plastic swing-arm or swing-ear "old-work" electric boxes similar the round electrical "box" shown below.

Newer plastic one-time piece of work boxes take an arm or "ear" that rotates outwards to secure the box by pinching confronting the inside of the drywall or plaster, brought tight by turning a screw.

Scout out: do non use a swing-arm electrical box mountain nor any other old-piece of work electric box mounting system to support ceiling light fixtures or fans whose weight may exceed the box mount system rating and crusade the fixture to fall from the ceiling.

See details at PLASTIC Electric BOX REPAIR

Suppliers of Old Piece of work Electrical Box Mounts, Clips, Supports - "Madison Bars"

• Appleton: 896, Hullo-102
• Arlington: SBS

• Caddy: DSI2A - widely-distributed including https://rexel-cdn.com/

  Caddy (R) One-time Piece of work ELECTRICAL BOX [PDF] -

• Cooper B-Line: BB33, BB33L
• Crouse-Hinds: TP708
• Dottie: SBS165

• Garvin OWC Old Work METAL BOX Prune [PDF] Garvin Industries Tel: ane-847-455-0188 Email: info@garvinindustries.com Website: world wide web.garvinindustries.com
  https://inspectapedia.com/electrical/Garvin-Quondam-Work-Box-Clip-Specifications.pdf
• Hubbell-RACO Grip-Lok(R) OLD WORK SWITCH BOX INSTALLATION INSTRUCTIONS [PDF] model #8977, used with any deep switch box that has ears, sport i seven/8" long legs, allows use of a conventional metal electrical box as an "old piece of work" box for installation into an existing wall or ceiling. (Instructions courtesy of Home Depot stores).

  Raco: 8977

Above: Madison Electric Products Madison 102 Switch Box Back up, - Galvanized Steel Textile; 5-1/4 Inch Fifty 10 2-1/iv Inch H Size; 500 Pair Standard Package; RoHS Compliant; Packaging Blazon Majority

• Madison Electrical Products, 31855 Van Dyke, Warren, MI 48093 USA, Tel: (586) 825-0200 Website: https://madisonelectric.com or alternative website info: HQ: Solon, Ohio, distribution facility in Duluth, Georgia, Tel: 1-800-631-7775 Website: https://meproducts.net/ Email: contactus@meproducts.internet or info@madisonelectric.com

  Also see the ceiling light fixture support box described

  at CEILING Lite FIXTURE INSTALLATION

  Website extract: In Apr of 1914, Morris H. Blumberg formed the Morris Blumberg Company in an old industrial building on Woodward Ave. in Detroit. ... what today is Madison Electrical Company, one of the largest electrical and electronic distribution firms in the country. The growth we take achieved over the past 100+ years is certainly attributable to Mr. Blumberg, his blood brother Max who joined him in 1916, and to the subsequent generations (now into our fourth) who have managed the business organization. ... In 1957, Madison Electrical Company of Ann Arbor was founded by the Madison management squad and ane of their outside salesmen. - retrieved 2022/04/24 original source: https://madisonelectric.com/virtually-us/

• Thomas & Betts: Steel Metropolis OLD WORK Electric BOX RETROFIT CLIPS SPECIFICATIONS [PDF] Steel City: 820D from Thomas& Betts, Tel: 901-252-8000, Tech Support: 888-862-3289, Website: world wide web.tnb.com
  This document describes both Sometime-Work switch box steel mounting holder #820D and Quondam-Work Box Support Clips (spiral-secured) #OWC and OWC-Swing-Ear.
  
• Topaz "F" Prune

Historical Patents of One-time Work Electric Boxes & Devices

These U.Due south. patents describing devices for securing or mounting "old work" electric boxes are arranged chronologically from oldest to newer inventions. In the U.G., Australia, New Zealand, Europe and other parts of Asia and Latin America other companies, inventions, and devices will, of course, have different ages and dates. Contributions to this list are invited from all readers.

To a higher place; Buchanan's electrical box back up patent from 1932.

[Click to enlarge any paradigm]

• Wagner, Joseph F. "Junction-box." U.S. Patent 1,090,805, issued March 17, 1914.
• Thomas, Jr George C. "Cablevision connecter." U.Due south. Patent i,644,312, issued October four, 1927.
  Excerpt:

  This arrangement prevents the pressure of the screw from pushing the cable Thousand dorsum out through the box hole, and this is an-of import feature forth with the fact that these improvements enable me to place the spiral within the box in this blazon of connecter which is an advantage because the connecter can be used for both quondam and new business firm wiring work.

• Davis, Elmer D., and Robert T. Payne. "Electrical fixture and fan support." U.S. Patent ane,824,708, issued September 22, 1931.
• Buchanan, Stephen Due north. BOX Back up [PDF] U.Southward. Patent ane,847,169, issued March 1, 1932.

  Excerpts:
  Ane of the main purposes of the invention is to provide means to anchor a box on or 1n the wall or to the wall lath without employing screws, nails or other means of the usual and well known kind for securing the/ box to the A farther object is to produce a ane slice box back up which is capable of being hands and quickly snapped or clipped onto the edge of the wall or to a lath, whereupon the box is so mounted on the support, the entire performance existence carried out without the use of nails or screws which avoids splitting, breaking or damaging the wall or lath thereof.

  A further object is to produce a box support which is also capable of belongings a switch block, plug receptacle, or other electric contact making device within the box without the use of screws.

  In other words, this latter object is in addition to the starting time 1 stated so that by the use of my invention, a box, together with a switch block (or other electric contact making device, may be mounted in a wall without the utilize of screws or nails.

• Buchanan, Stephen N. ADJUSTABLE SUPPORTING Means [PDF] U.S. Patent one,855,751, issued April 26, 1932.

  Notation: an early, separate, adjustable back up clamp for mounting electrical boxes.
  Extract: This invention relates to adjustable supporting means for various articles, such equally conduit or outlet boxes, used in electrical calorie-free wiring of buildings, conduits carrying electric light wires, signal wires,.water, gas etc.

• Yanchenko, Basil J. "Grounding connecter." U.South. Patent one,890,105, issued December half-dozen, 1932.
• Olier, Jr Henry D. ELECTRICAL FIXTURE SUPPORTING DEVICE [PDF] U.South. Patent 1,897,954, issued February 14, 1933.
• Hubbell, Jr Harvey. UNIT WALL BOX and RECEPTCLE [PDF] U.S. Patent 1,971,302, issued August 21, 1934.

  Note: this patent illustrates Hubbell's T-shaped wall plug receptacle socket openings.

  Extract: It is, therefore, an object of the present invention to provide a receptacle structure in which the usual wall box is not necessary, and in which it is non necessary to provide a greater opening in the wall or baseboard than is required for the receptacle itself.

• De Witt, Burton. Electric SWITCH and RECEPTACLE BOX [PDF] U.S. Patent ane,978,401, issued Oct 30, 1934.
  Excerpts:

  A further and of import object of the invention is to provide a switch or receptacle box that is automatically anchored in set position during placement thereof in a wall or other opening and eliminating the utilise of plaster ears so that a box may be fix into an opening with less difficulty.

  The electrical switch and receptacle box in this awarding is primarily designed for old piece of work as distinguished from new work. The box heretofore employed comprised 3 wall sections including a 1 piece bottom and ends and separable side walls to permit gangable installation and such boxes require a series of lug and screw devices for retaining the separable walls in assembled germination.

  The end walls of the known box carry mounting plates or plaster ears to facilitate the mounting of the box past means of the plaster ears on studding or other support.

  The screws for attaching the plaster ears to the end walls of the box project interiorly of the box and are exposed to the wire leading from a switch and often produce what is known in the trade every bit a swinging ground.

• Seckinger, George D. OUTLET BOX HANGER [PDF] U.S. Patent two,032,636, issued March iii, 1936.

  Excerpts: By fashion of explanation, it may exist stated that the locating of an outlet box of the kind used past electricians is a somewhat difficult task, either on new work or on old work.

  The location of the box presupposes that the carpenter volition provide a proper support for it. Sometimes the support is not properly located on new work, and it very often has to be provided on old work.

  At that place are problems such as placing the box in a level and in a symmetrical position, in properly spaced relation horizontally, to the frame of a door, and the like.

  The foregoing being understood, it may be stated that the object of the present invention is to provide a simple subclass whereby an outlet box may be located properly under almost all of the conditions that can exist met with in bodily exercise, the bracket being adapted to the utilize of practically every outlet box at present plant on the marketplace.

• Embrace, Peter, ELECTRIC SWITCH BOX [PDF] U.S. Patent 2,286,898, issued June 16, 1942.
  Extract:

  One of the principal objects of my invention is to provide a switch box equipped with inner and outer elements for securing the box within the discontinuity of the wall. Another object of my invention is to provide a box equipped with adaptable sides controlled by a securing ways.

  A farther object of my invention is to provide a switch box of the above described grapheme which is adaptable for use in connection with quondam too as new work by means of the several adjustments for various widths of apertures or thicknesses of walls.

• Robert, Haynes. OUTLET Neckband FLANGE [PDF] U.S. Patent 2,374,993, issued May ane, 1945.
  Excerpt:

  In many places where electrical outlet boxes are required, peculiarly in connectedness with erstwhile work, at that place is not sufficient working room for a proper installation, such as could be 'done on new piece of work, and when the ordinary box and hanger are employed, the hanger bar rests on the upper surface o f the ceiling.

  There is no way of fastening the hanger bar, unless the ceiling is cut away to give access to the, hanger: merely a cutting away of the ceiling is undesirable, because it calls a plasterer on the task, to close the breach in the ceiling. The present invention aims to provide such a structure whereby the difficulties above referred to may be remedied,` novel means being employed in [making a ?] place and holding it securely anchored.

• Kolb, Walter Thousand. "Convenience outlet." U.South. Patent 2,459,659, issued Jan eighteen, 1949.

• Shepard, Frank B. WALL BOX OUTLET MOUNTING [PDF] U.Southward. Patent two,586,728, issued Feb 19, 1952.

  Annotation: this is an early on F-clip or clip type electrical box mounting device.
  Excerpts:

  The object of the invention is to provide a fixture which will facilitate the installation of diverse sized switch boxes in wall boards of buildings.

  Another object of the invention is to provide a fixture for maintaining a switch box anchored in a wall board opening even though the switch box be subjected to bear on and other stresses.

  A further object of the invention is to provide a supporting fixture for switch boxes which is extremely elementary and inexpensive to manufacture.

  ... From the foregoing, information technology volition be apparent that a device has been provided which will facilitate the installation of various types of electrical switch boxes. The devices has no sharp edges and there is provided a board surface area of surface contact for preventing the switch box I2 from working loose from the wall board [0. Past using the supporting fixture, the user can easily install switch boxes in new or sometime building constructions. The fixtures are fabricated of sheet metal, such as sheet steel, copper, aluminum, or the similar, in guild to conform to the necessary edifice codes.

• Bragg, William E. MOUNTING Means for FLUSH RECEPTACLES [PDF] U.S. Patent 2,767,945, issued October 23, 1956.
  Excerpt:

  This invention relates to new and useful improvements and structural refinements in means for mounting affluent type receptacles in wall recesses, and the master object of the invention is to provide extremely unproblematic mounting means of this type whereby the installation of a receptacle in a wall may be chop-chop and easily effected.

• Clark, Edward B. "Armored cable clamp for a beveled corner box." U.Southward. Patent ii,814,509, issued November 26,

Above: the "Madison Bar" or electrical box support designed and patented past Albrecht and filed by Madison Equipment Co. granted in 1967.

[Click to enlarge whatsoever image]

• Albrecht, David B. Electrical BOX SUPPORT [PDF] U.South. Patent iii,337,168, issued August 22, 1967. Application filed past Madison Equipment Co.

  Excerpts:
  David B. Albrecht, Shaker Heights, Ohio, assignor to Madison Equipment Company, Cleveland, Ohio, a corporation of Ohio Filed Aug. 18, 1965, Ser. No. 480,718 v Claims. (Cl. 24827) ABSTRACT OF THE DISCLOSURE The disclosure relates to a switch box securing device which is a fiat thin metal bar with laterally extending specially removed fingers integrally formed with one border of the bar.

  The bar terminates in a flat stop a altitude from one finger and terminates in a beveled stop at the other end. A cutaway portion in the finger remote from the askew finish extending from a betoken intermediate the end of one finger and terminating in the adjacent side of the bar.

  A recess is formed along the reverse edge of the bar from that which the fingers are attached to accommodate the laterally protruding switch box ganging means, and a wall embedding projection emanating from the aforementioned edge of the bar as the fingers at a position intermediate one of the fingers and a concluding stop of the bar.

  This invention relates to electrical wiring products and more particularly to an electrical box support for securing electric switch boxes into wall openings.

  In the placement of electrical switch boxes at desired wall positions of buildings which have already been constructed or into buildings which have walls constructed out of commercially available materials such as wallboard, plaster, wood, etc., it has been found expedient to employ electrical switch box straps of a construction which include a thin apartment sheet metal strip having an edge which engages the rearward surface of the wall, and which has laterally projecting fingers formed integrally with the rear wall surface engaging edge.

  The fingers are made of a resilient material and are capable of being bent about the switch box side walls to prevent outward move of the box relative to the wall discontinuity.

  Switch boxes in the most usual form are of the well known rectangular type. When placed into the accommodating wall aperture, the inward movement of the switch box is limited by protuberances or ears, which are mounted in opposed projecting relationship to the upper and lower walls of the box, engaging the outward surface of the wall.

  Nevertheless, unless appropriate ways are provided to limit the outward motility of the box it is obvious that the box will not be held in the appropriate wall discontinuity. It is the purpose of my electric switch box back up to engage the rear of the wall and provide outwardly extending fingers which are clamped to the sides of the switch box to prevent whatsoever forwards movement of the box.

  In addition, modern switch boxes are provided with suitable clamping means on the upper and lower surfaces which cooperate with suitable compatible clamping means carried by the side Walls thereof to permit a plurality of individual switch boxes to be ganged together where the installation and so requires.

...

Continue reading at ELECTRICAL RECEPTACLE LOCATIONS or select a topic from the closely-related articles below, or see the consummate Article INDEX.

Or meet these

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  • Outside Electrical BOX REPAIR
  • Metal ELECTRICAL BOX Screw REPAIR
  • Sometime WORK Electrical BOXES for RETROFIT
  • PLASTIC ELECTRICAL BOX REPAIR
• ELECTRICAL BOX GROUND WIRING
• ELECTRICAL OUTLET, HOW TO ADD & WIRE - home
• ELECTRICAL OUTLET, HOW TO Add together in OLDER HOME
• ELECTRICAL RECEPTACLE Meridian & CLEARANCES
• Electric RECEPTACLE LOCATIONS
• Erstwhile HOUSE Electric SYSTEMS
• Former House Electrical GROUNDING
• SIZE of WIRE REQUIRED for Electric RECEPTACLES for receptacle circuits and similar wiring situations

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