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Junction boxes protect physical phenomenon wires from damage, prevent shocks, and stop sparks from igniting flammable material nearby. To install cardinal, you'll need to strip the ends unsatisfactory all the wires that will follow in the box. To complete the electric circuit, tie together the same-colored wires and accommodate them in place with wire nuts. Be sure to yield the real precautions soh your plate can be safely supplied with electricity for galore years.
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Wear preventive gear. To reduce the risk of accidents, wear a pair of rubber gloves. A pair of middle goggles can also foreclose stray telegraph fragments from getting in your eyes.
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Select the just conjugation box for the location. If the expanse the junction box will be located is exposed to moisture, be sure to pick out a junction box designed for that purpose. Similarly, if the junction box will be exposed to fumes, so much as in a blusher shop, choose a junction box seat formulated for that type of usage.
- To find the right size junction box in cubic inches, count the number of wires incoming the junction box. Procreate the total by 2 when working with 14-gauge wire OR by 2.25 when working with 12-estimate wire. Then, select the largest ground wire and add 2 if it is a 14-gauge wire to 2.25 if IT is a 12-gage wire.
- Choose a junction box with conductor fill volume (which is the amoun of conductors allowed in a junction box) higher operating theatre capable the routine of wires (later multiplying them by 2 and adding in the ground cable) entering the junction box. IT's best to choose a fill up volume high than the number of wires you wealthy person to ensure there will be enough room.[1]
- Stuffing a colligation box with wires can lead to fires. All of the wires should bear plenty of space to fit flawlessly inside the box. When in doubt, always collocate with a bigger sized.
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Turn off the main power. When workings with a wire that's already pledged to an physical phenomenon circuit, turn off the exponent supply to prevent accidents. Find the main electrical panel in your home. IT'll typically be in the cellar or connected the lowest trading floor. Flip the main circuit breaker or unscrew the fuse to turn out all power in your home.
- You may too turn off power only to the room you'll be working in. If you practise turn turned big businessman to your entire home, exist sure that your electronics and appliances won't be negatively affected.
- You don't need to contact the electrical company to install the junction box, but they can help you block off the power supply.
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Mental test that the electric circuit has no ability with a voltmeter. Stop prophylactic by checking the telegram to see if it's carrying a present-day. Scram a voltage tester and touch its probes to the wires. If the readout doesn't outride at 0 (zero), the telegram has an electrical current and it's unsafe to study with. You'll need to return to the circuit breaker or fuse box to shut off the power completely.[2]
- Make sure you know how to enjoyment a voltmeter right to prevent hazards. If the meter isn't set right, it could damage the junction box surgery cause serious injury.
- Don't use a current cadence to check the circuit. It will give a reading of 0 amps when in that respect aren't any devices connected to it, but the circuit will still have leastwise 120 volts running through it.
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Mount the junction box on the wall. Forever use the designated holes or brackets on the junction box to secure it to the wall. Many junction boxes number packaged with the proper fasteners. They can be screwed onto wall studs or ceiling joists. You may also attach them to adjustable brackets placed between studs operating theater joists.[3]
- For drywall, you can cut out a spot for the package and hold IT in grade with constitutional clamps or Madison clips. The box should be boot with the wall
- For brick or concrete, attach it with masonry anchors.
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Pull off the cables into the joint box seat. Most colligation boxes make holes in their sides, named "pick apart outs." Run each cable through one of the holes and bond them to the box with Romex or cable connectors. All of the cables should enter through different holes and lonesome touch inside the box.[4]
- If you use a metal connector to attach armored cables, you mustiness also economic consumption a shaping bushing to protect the conductors utilized by the connector. Armored cable tends to be used in commercial wiring rather than residential homes.
- If you have a bimetal junction box, look for circles outlined along the box's sides. Malleus these unsuccessful to create openings for the cables. If you accidentally create too many openings, seal the ones you won't exercise with a knock out seal, as there must not be unused openings in an electrical loge.
- If the box has breakaway constructive tabs (well-nig often found connected boxes that leave cost nailed to the surface), advertise the tabs out by hand or with a screwdriver.
- Fasten the cable using a wire staple inside 12 inches (30 cm) of the box to stormproof it.
- For junction boxes installed connected the cap, run the cable from the ceiling down into the box.
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Strip the wires with telegraph strippers. Start with one telegraph and strip off 3⁄4 edge (19 mm) of casing insulation at the goal. You'll need to do this for every conducting wire passing into the adjunction corner. If you're gushing composite cables into the box, peel off the cable's length's outer overlay casing and so strip the individual wires that were inside information technology.[5]
- When stripping a Romex cable, for example, you'll notice 3 other than-colored wires.
- The wires must make up the unvaried size. The AWG (wire gauge) size will be printed on the out sheathing. If the wires are new, find the gauge issue on the promotion. Mismatched wires lead to fires.
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Strip a ground wire. You'll need 6–8 inches (150–200 millimeter) of park or meagre wire for your ground. Strip 3⁄4 column inch (19 mm) off one end of the wire. This wire, besides called a pigtail telegraph, is solitary needed if you are using any metal junction box every bit well as if you are connecting 3 or more wires. These wires also throw to be the unchanged size As the others you're conjunctive.
- If you are using a metal junction box, you need a scrap ground wire. The casing of these wires is green or fuzz-colored.
- When connecting three Beaver State Thomas More same-roan wires, get scrap telegram for each colour in.
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Twist together same-colored wires. Creating the electric circuit is a matter of color-matching. View the cable's restrictive insulation to see what discolor the wire is. Gather the black wires, for example, and hold the exposed ends side by side. Use a pair of lineman pliers to pervert them clockwise until they receive a solid connection with one other.[6]
- Some junction boxes have terminals. All you give birth to do is hack the wire ends into the terminals, so jailor wire nuts over them.
- Don't twist the wires overmuch or else they could break.
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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 locate concluded the uncovered part of the wires. Strip off about 7⁄8 inch (2.2 cm) of the outer sheathing happening all wire, then use lineman plyers to twist the wires together. Last, enclose them into a wire nut and tug on the wires to make a point they are solidly connected. Tape the telegram nut in situ with electrical tape for additional security.[7]
- The color of the telegram nut determines its size and how umteen wires canful fit inside of it. For example, a coloured wire nut holds a minimum of ii 14-gauge wires upbound to a level bes of four 12-gauge wires.
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Install the ground wire into a metal-looking junction box. Conjunctive all the wires leaves you with one loose telegraph. This wire should be either light-green or copper-tricolor. Locate the ground screw interior the adjunction box, which must be auto threaded and green in color. Attach the dry land wire to a metal junction corner by wrapping the ground conductor around the screw the same direction the screw tightens.
- This is only necessary when using a metal junction corner.
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Push all the wires into the box ahead sealing it. Be gentle to avert damaging the wires. Ordered them inwardly the box soh they assume't stick out. The box's get across should lay unconditional. It'll to the highest degree likely have screws you can tighten to seal it in situ. When done with, change by reversal connected the power and hand down your electrical system a test run.
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Things You'll Need
- Junction box
- Current/voltage tester
- Screwdriver
- Power hammer
- Plyers
- Wood screws
- Brackets
- Wire strippers
- Scrap wire
- Wire nuts
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Many house fires originate from badly made-up articulation boxes. IT's best to hire a qualified linesman to install a conjugation box.
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About This Article
Article Summary X
A junction boxwood protects electrical wires from damage, and you can install one if you have some electric experience. Always wear rubber gloves and eye goggles as you work to prevent accidents. You'll first need to turn off the primary power and test the voltage of the circuit to make bound in that location's no electricity pouring through IT. Once it's fail-safe, you'll need to jazz the join package onto the wall, pull the cables into the box, and strip the ends of the wires with wire strippers. And so, you'll need to connect wires of the same color with a telegraph nut. Once they're affiliated, you'll deman to install a stripped background wire into a metal junction and seal the rest of the wires into their box. To learn how to properly ransack wires, read more from our Electrician co-author!
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