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10 Pack of 80mm Round Electrical Junction Box with Rubber Cable Entry Grommets and Snap-on Lid IP44 Splashproof Weatherproof

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If this is the case you are asking the circuit to use much more energy than the circuit is designed for. More energy = more heat and cables can catch fire! Select the right junction box for the location. If the area the junction box will be located is exposed to moisture, be sure to choose a junction box designed for that purpose. Similarly, if the junction box will be exposed to fumes, such as in a paint shop, choose a junction box formulated for that type of usage. The cable cores will need to be stripped before being inserted into the terminals. Try to expose the minimum amount of the conductor as necessary. 10 – 12mm will be typically sufficient for this, unless you are doubling them over then around 15mm is required. Junction boxes come with either 3, 4, 5 or 6 terminals so work our which you will need to complete your project. The terminals are where the connections will be made by inserting the wire core from either side or the wiring run and then screwing the terminal close to create a safe electrical junction and join. The rating that you use must reflect the current of the circuit that it will be used on. It is possible to use a higher amp rated junction box on a lower rated circuit, but never the other way around – To summarise:

When it comes to wiring up junction boxes, as you would expect, there are some quite strict rules on how they are wired, where they can be placed and how any cables should be secured. All of this is covered below. When on, the switch is connecting the switched live and live terminals together (top and bottom in this example).In terms of accessibility, this means that a builder or electrician can easily remove part of the floor or ceiling etc. and access the junction box when required. Junction boxes may not be buried in plaster or other similar materials.

As with the ceiling rose, the IN cable supplies power from the consumer unit or previous junction box, and the OUT cable connects to the next junction box. These cables have permanent live, neutral and earth wires. Electricity is dangerous, that’s a fact! We are all taught this from a very young age. When it comes to the electrics in your home, unless you know what you are doing or are a “competant person” then you should leave it well alone! Choose a junction box with conductor fill volume (which is the number of conductors allowed in a junction box) higher or equal to the number of wires (after multiplying them by 2 and adding in the ground wire) entering the junction box. It’s best to choose a fill volume higher than the number of wires you have to ensure there will be enough room. [1] X Research source Step 3 – Connect to Terminals: Once all stripped, connect each core wire to an individual terminal ensuring that each type of core is connected to the same from the other cable, e.g. a 3 brown lives in one terminal, all 3 blue neutrals in another terminal and all 3 earths in another terminal. Also ensure that you add earth sheath to each bare earth wire – This has to be done by law! If you use a metal connector to attach armored cables, you must also use a plastic bushing to protect the conductors utilized by the connector. Armored cable tends to be used in commercial wiring rather than residential homes.Single screw terminal – The terminal has one screw which is screwed closed on to the cable cores being joined together to secure them all in one single connection point. These are typically found in the Standard junction box, and allow the connection of a larger number or sizes of cable cores that the other terminal types Junction boxes are rated in amps to protect them, you and the circuit. Make sure you have the right box for the right job. A ring main ( more about ring mains can be found in our project here) and also a radial circuit ( more about radial circuits in our project here) will need a 30 amp junction box, whereas a lighting circuit (although you can buy 5amp junction boxes) will need a 20amp junction box. We will explain the differences between these types of junction box and their various benefits shortly, however it is important that you have the right rating whichever type that you choose. Junction Box Amp Rating Step 3 – Connect Wires: Once all stripped, connect the same core wire from each length of cable to the same terminal in the junction box e.g. brown live to live, blue neutral to neutral and earths to earth (remember to add some earth sheath to the earth wires – this is a legal requirement!). Make sure you screw each terminal screw down nice and tight

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