What size junction box


AC wire normally doesn't have a plastic shield


the armor. The outside is bare metal. Which doesn't work very good outdoors if it's steel.

Here, AC wire with a sheath over the armor is usually called TECK cable.


fine outdoors.

An electrician wouldn't ordinarily have problems with 3x #6 splices in a 4x4x2 j-box. You might want to use a utility box. These are usually simple rectangular boxes meant to be surface mounted with knockouts for cable clamps. Unlike j-boxes which have integral cable clamps, cover ears etc.

We have one somewhere around 4x4x6" holding a splice between 3 #4 copper and 3 #3 Al (100A feeder to a garage) plus the ground.

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Given the large size of the conductors, I would use aluminum for this, specifically the new AA-8000 series alloys. Yes, aluminum has a bad reputation as a wire. But that only applied to the faulty AA-1300 alloys installed during the postwar housing boom, and even then to the small-gauge stuff where it was used instead of 12-14 gauge copper. 1300 is now outlawed in any gauge. 8000 is fine, and about 1/3 the cost of copper. The wire-run chart says to use 2ga aluminum. Which will require larger conduit.

Second, it sounds like you also want 120V convenience outlets out there too. But if you didn't need that, I would ask your vendor if they offer a machine that is 240V instead of 120V, and wire a 240V 10A circuit. That would let you do this in 10ga copper. (In those smaller sizes, aluminum isn't much cheaper.)

Double the voltage, halve the current, quarter the...

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Junction boxes are used any time multiple wires need to be connected. It is against the National Electric Code to simply use...

Electric light fixture junction boxes are enclosures mounted behind the wall or ceiling that perform a two-fold function. First, they provide a...

Making splices in a breaker box begins with a solid understanding of what the NEC (National Electric Code) has to say on...

Whenever wires have to be joined together in home circuitry, you need a junction box. In very old homes, you might find...

The National Electrical Code (NEC) mandates specific sizes for pull boxes, determined primarily by the conduit, or raceway, sizes and pulling scheme....

Gaps between the electrical panel and appliances, found in the home, are bridged using electrical wiring. Commonly made from copper, electrical wires...

Connecting a 4-wire and a 3-wire circuit at a junction box is used to connect two 120-volt circuits to one...

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Q: If I wanted to use a wall dimmer switch, such as those made by Lutron, how would I wire it? Would the dimmer switch need to be between the 12V adapter and the junction box? Is this correct?:
12 V Adapter --> Dimmer Switch --> Junction box --> LED lights - by WDR (United States) A: It would depend on the dimmer switch, you need to check with Lutron for that. The ones that I have heard of wire to 110v so it would be dimmer switch>adapter>junction box>leds. Q: Will Oznium ever produce a waterproof version of this box? - by Colin (Theodore, AL) A: No plans for that. You can place it inside a plastic bag or box to make it waterproof. Q: How many 5mm prewired LEDs could I fit into this box?? - by Dan (United States) A: Junction box can handle up to 5 amps total, the leds only use 20 mA. 100 leds would be 2 amps. Q: Can you wire this into your $39.99...
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A junction box is an enclosure that protects a connection (the junction) of two or more wires carrying electrical current. This level of protection is needed to prevent fires and to maintain solid, reliable connections that stay tight over many years. The use of junctions removes the need to run a wire from every outlet or switch back to the main service panel.

When a junction box is used for every electrical connection in a building it is much easier to locate and repair any electrical problems that come up. When some connections are made without junction boxes, such as inside wall cavities or in hidden ceiling or attic locations, the likelihood future problems increases. Every electrical connection should be inside a protective box that is easy to find and access.

Junction Boxes are Metal or Plastic

An electrical junction box can be made of either metal or plastic and they are called by a variety of names. This is because they come in various shapes and...

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Guide to types of electrical receptacles (wall "outlets" or "wall plugs"):

How to choose the right type of electrical receptacle when adding or replacing a wall outlet in a building. Here we describe matching 15-Amp receptacles to 15-Amp circuits, 20-Amp receptacles to 20-Amp circuits, two-wire receptacles where no ground is present, GFCI and AFCI electrical receptacles, and the proper electrical box to hold and mount these devices.

This article series describes how to choose, locate, and wire an electrical receptacle in a home. Electrical receptacles (also called electrical outlets or "plugs" or "sockets") are simple devices that are easy to install, but there are details to get right if you want to be safe.

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Electrical junction boxes are devices that contain the wiring junctions or intersections that allow the wiring in the home or public building to interface with the main power supply provided by a local utility. The presence of the box is generally regarded as both practical and more esthetically pleasing than a bunch of exposed electrical wires. While the exact configuration for electrical junctions containers of this type vary slightly, there are a few basic elements that are common to all designs.

For many people, the main purpose of a junction box is to conceal the electrical junctions from sight. Usually constructed with the use of metal or hard plastic, the general appearance of the box is either a square or rectangular design. A door on the front allows access to the interior. The door may be recessed in the front of the junction box, or the entire facing may swing upward or downward to allow access to the junctions within the device. In many homes, the box proper is...

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Electrical junction box in the process of installation.

Electrical conduits

terminate at the sides and


pass through or are joined inside the box.

Australian Internal Surface Mounted Junction Box - showing wiring stages.

An electrical junction box is an enclosure housing electrical connections, to protect the connections and provide a safety barrier.


A small metal or plastic junction box may form part of an electrical conduit or thermoplastic-sheathed cable (TPS) wiring system in a building. If designed for surface mounting, it is used mostly in ceilings, under floors or concealed behind an access panel - particularly in domestic or commercial buildings. An appropriate type (such as that shown on the right) may be buried in the plaster of a wall (although full concealment is no longer allowed by modern codes and standards) or cast into concrete - with only the cover visible.

It sometimes includes built-in...

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How to wire a solar panel junction box (or terminal box) is one of the most commonly asked question that we receive. This is a short introduction on how to wire a junction box.

Some of the solar panels, such as Kyocera & Sharp come with serviceable junction boxes. However, most solar panels require wiring the junction box before installation.

To begin, unscrew the 4 screws in order to open the junction box. Inside, you will notice that there are more screws than you might expect. There are only two screws that you will need to unscrew. These are the ones on the bottom left and right, under which there should be a positive and negative sign.
Don't disconnect the mounting and diode connection screws.
Bring the wires into the junction box via a conduit or directly with a cable using a rainproof cable connector.

Here are some websites for further detail photographs and explanation.

[image credit:...

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