How To Install A Gang Box

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Junction boxes protect electrical wires from damage, preclude shocks, and cease sparks from igniting flammable cloth nearby. To install ane, you lot'll need to strip the ends off all the wires that will be in the box. To complete the electrical circuit, necktie together the same-colored wires and hold them in identify with wire nuts. Be sure to take the proper precautions so your dwelling house tin can exist safely supplied with electricity for many years.

Things You Should Know

• Use the designated holes or brackets on the junction box to mount and secure the box to the wall.
• Use wire strippers to strip ³⁄₄ inch (19 mm) of casing insulation off the end of every wire going into the junction box.
• Twist the exposed ends of the same-colored wires together with a pair pf pliers. Apply a wire nut to connect multiple wires.
• Push all the wires into the box earlier sealing it. Then, turn on the power and give your electrical system a test run.

1. 1

   Article of clothing protective gear. To reduce the risk of accidents, article of clothing a pair of rubber gloves. A pair of eye goggles can also prevent stray wire fragments from getting in your optics.

2. ii

   Select the right junction box for the location. If the surface area the junction box will be located is exposed to moisture, exist sure to choose a junction box designed for that purpose. Similarly, if the junction box will be exposed to fumes, such every bit in a paint shop, choose a junction box formulated for that blazon of usage.

   • To discover the right size junction box in cubic inches, count the number of wires entering the junction box. Multiply the total by 2 when working with 14-approximate wire or past 2.25 when working with 12-guess wire. And then, select the largest ground wire and add together 2 if it is a xiv-gauge wire to ii.25 if it is a 12-gauge wire.
   • Choose a junction box with conductor fill up volume (which is the number of conductors allowed in a junction box) higher or equal to the number of wires (after multiplying them by ii and adding in the ground wire) entering the junction box. Information technology'southward all-time to choose a fill volume higher than the number of wires yous have to ensure in that location will be enough room.^[i]
   • Stuffing a junction box with wires can lead to fires. All of the wires should have plenty of space to fit cleanly inside the box. When in doubt, always get with a bigger size.

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3. iii

   Plow off the principal power. When working with a wire that'southward already fastened to an electrical circuit, turn off the power supply to prevent accidents. Detect the main electrical panel in your dwelling. Information technology'll typically exist in the basement or on the lowest floor. Flip the main circuit breaker or unscrew the fuse to turn off all ability in your dwelling.

   • You may as well turn off power only to the room y'all'll be working in. If you practice turn off ability to your entire habitation, be sure that your electronics and appliances won't be negatively affected.
   • You don't need to contact the electric visitor to install the junction box, but they can assist y'all shut off the ability supply.

4. 4

   Examination that the circuit has no power with a voltmeter. Stay safe by checking the wire to see if it's carrying a current. Become a voltage tester and touch on its probes to the wires. If the readout doesn't stay at 0 (zippo), the wire has an electrical current and it's dangerous to work with. You'll demand to render to the circuit breaker or fuse box to shut off the power completely.^[2]

   • Brand sure you lot know how to utilise a voltmeter properly to preclude hazards. If the meter isn't prepare correctly, it could impairment the junction box or cause serious injury.
   • Don't use a current meter to check the excursion. It will give a reading of 0 amps when there aren't whatever devices connected to it, but the circuit will nevertheless have at least 120 volts running through it.

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1. 1

   Mount the junction box on the wall. Always use the designated holes or brackets on the junction box to secure information technology to the wall. Many junction boxes come packaged with the proper fasteners. They can be screwed onto wall studs or ceiling joists. You may also adhere them to adjustable brackets placed between studs or joists.^[three]

   • For drywall, yous can cutting out a spot for the box and agree it in place with built-in clamps or Madison clips. The box should be flush with the wall
   • For brick or concrete, adhere it with masonry anchors.

2. 2

   Pull the cables into the junction box. Well-nigh junction boxes take holes in their sides, called "knock outs." Run each cable through 1 of the holes and attach them to the box with Romex or cable connectors. All of the cables should enter through dissimilar holes and only touch within the box.^[4]

   • If you employ a metal connector to attach armored cables, you must too use a plastic bushing to protect the conductors utilized past the connector. Armored cable tends to be used in commercial wiring rather than residential homes.
   • If yous have a metal junction box, look for circles outlined on the box'south sides. Hammer these out to create openings for the cables. If you accidentally create too many openings, seal the ones you won't use with a knock out seal, as in that location must not be unused openings in an electrical box.
   • If the box has breakaway plastic tabs (nearly often found on boxes that will be nailed to the surface), push the tabs out by hand or with a screwdriver.
   • Fasten the cable using a wire staple within 12 inches (30 cm) of the box to secure it.
   • For junction boxes installed on the ceiling, run the cablevision from the ceiling down into the box.

3. 3

   Strip the wires with wire strippers. Commencement with 1 wire and strip off ³⁄₄ inch (nineteen mm) of casing insulation at the cease. You'll need to practice this for every wire going into the junction box. If y'all're running composite cables into the box, strip off the cable's outer sheathing casing so strip the individual wires that were within it.^[5]

   • When stripping a Romex cable, for example, you'll observe 3 differently-colored wires.
   • The wires must be the same size. The AWG (wire judge) size volition be printed on the outer capsule. If the wires are new, find the judge number on the packaging. Mismatched wires lead to fires.

4. 4

   Strip down a ground wire. You'll need 6–8 inches (150–200 mm) of green or bare wire for your ground. Strip ⁱⁱⁱ⁄_iv inch (xix mm) off one end of the wire. This wire, as well chosen a pigtail wire, is only needed if you lot are using any metal junction box besides every bit if you lot are connecting iii or more than wires. These wires also take to be the same size as the others you're connecting.

   • If you are using a metallic junction box, you lot demand a scrap ground wire. The casing of these wires is green or copper-colored.
   • When connecting three or more same-colored wires, get scrap wire for each color.

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1. 1

   Twist together same-colored wires. Creating the electrical circuit is a matter of color-matching. Look at the wire's protective insulation to come across what color the wire is. Gather the black wires, for instance, and hold the exposed ends side by side. Use a pair of lineman pliers to twist them clockwise until they have a solid connection with one some other.^[6]

   • Some junction boxes take terminals. All yous have to exercise is plug the wire ends into the terminals, then screw wire nuts over them.
   • Don't twist the wires as well much or else they could break.

2. 2

   Use a wire nut to connect multiple wires. When attempting to connect 2 or more wires, use the proper size wire nut. They look like caps and twist in place over the exposed part of the wires. Strip off most ⁷⁄₈ inch (2.two cm) of the outer sheathing on each wire, then use lineman pliers to twist the wires together. Finally, insert them into a wire nut and tug on the wires to make certain they are solidly continued. Tape the wire nut in identify with electrical tape for additional security.^[7]

   • The colour of the wire nut determines its size and how many wires tin can fit within of it. For case, a red wire nut holds a minimum of 2 14-gauge wires up to a maximum of four 12-estimate wires.

3. three

   Install the ground wire into a metal junction box. Connecting all the wires leaves you with ane loose wire. This wire should be either green or copper-colored. Locate the ground screw inside the junction box, which must be automobile threaded and green in color. Attach the ground wire to a metal junction box by wrapping the ground conductor effectually the screw the same direction the screw tightens.

   • This is merely necessary when using a metal junction box.

4. iv

   Push all the wires into the box before sealing it. Be gentle to avoid damaging the wires. Set up them inside the box and so they don't stick out. The box's comprehend should lay flat. Information technology'll virtually likely have screws you can tighten to seal information technology in place. When finished, turn on the power and give your electrical system a test run.

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Things Y'all'll Need

• Junction box
• Current/voltage tester
• Screwdriver
• Hammer
• Pliers
• Wood screws
• Brackets
• Wire strippers
• Scrap wire
• Wire basics

• Many firm fires originate from poorly made-up junction boxes. Information technology's best to hire a qualified electrician to install a junction box.

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Commodity Summary X

A junction box protects electrical wires from damage, and you tin can install one if you take some electrical feel. Ever habiliment rubber gloves and heart goggles every bit you piece of work to prevent accidents. You'll start demand to turn off the primary ability and test the voltage of the circuit to make sure at that place's no electricity running through it. Once it's prophylactic, y'all'll need to spiral the junction box onto the wall, pull the cables into the box, and strip the ends of the wires with wire strippers. Then, you'll need to connect wires of the aforementioned color with a wire nut. Once they're continued, you'll need to install a stripped ground wire into a metal junction and seal the balance of the wires into their box. To acquire how to properly strip wires, read more from our Electrician co-author!

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