This method of wiring is not recommended. The main problem is that the junction boxes must remain accessible - rather difficut once they are hidden under floorboards. If normal ceiling roses are fitted, the terminals in them are largely wasted, and additional money has been spent on junction boxes which are not needed.

Throughout the years, WISKA focusses on a close and good cooperation with its business partners. In 2018, WISKA once again launches products on the market which, after intensive discussions with contractors, also incorporate practical experiences. The switch connects between the permanent live and the switched live terminal. The lamp is connected to the neutral and the switched live. 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. Likewise, the cables running into and out of the junction box should also be secured to a suitable, stable surface. If not, then “mechanical strain” could take place and over time, wires may become loose causing loose connections. Junction Box with spur wiring diagram – Adding a Spur using a Junction box Fixing cables into the Junction BoxIf you have ever needed to join 2 sections of cable or wire together or create an additional spur for a new piece of cable then you should be well aware of the existence of the junction box and if not, this is the product you want if you are needing to do either of these jobs.

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. There is no requirement for a junction box to be either round or square, and they are commonly both. As a rule of thumb the more common round junction boxes are typically used for lower current cables. Use green and yellow earth sheathing to cover the earth which will most likely be bare at present. As commented, this is a legal requirement stated in the Wiring Regulations. Which Colour Wires are Which?There are also different styles of junction boxes that you can use. Each will differ slightly depending manufacturer (terminal layout, slightly different mouldings etc….), but the essentials should all be the same: As we have stated in the how to wire section above, junction boxes must be fixed solidly to a firm, suitable surface and must be accessible! These rules are stipulated in the latest 18th edition regulations and must be adhered to. Screw the base of the junction box to a joist or rafter through the securing holes indicated in the image below. 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. 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.