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Read carefully all the cautions and instructions and follow them strictly while doing this tutorial or any other work in practical related to electrical works. To help manage this, in most consumer units, a separate ring main is usually installed on every floor of a given property to make sure things are kept safe and manageable in that if an issue occurs on one circuit, this won’t be reflected in the other circuits and they should still work as intended. Finally, the electrician then issues an EIC or DEIC (Electrical or Domestic Electrical Installation Certificate) certificate for all the work that has been carried out. Under Part P as replacing a consumer unit is notifiable works this is a legal requirement. In terms of the law, RCD’s are only required to be installed in a new build, where additions or major alterations are done to an existing property or when a rewire is carried out.
Scottish Islands:HS1-9, IV40-51, IV55-56, KA27-28, KW15-17, PA20, PA30, PA32-34, PA41-49, PA60-78, PH42-44, ZE1-3 More recently RCBO’s have since come onto the scene. These are essentially a combination of an MCB and RCD so provide additional safety levels. Also they resolve the nuisance tripping issue highlighted in subsequent versions of the Wiring Regulations. Enclosures are typically used as an extension to an existing consumer unit but can also be used in isolation. Typical applications include house and loft extensions, garages, sheds, workshops or for showers.Firstly, MCB’s are clipped on to the DIN rail and positioned as required for the number of circuits that are being run from the consumer unit. In essence what it does is if it detects an imbalance in electrical flow or too much residual earth current, it will then cut the power to all of the MCB’s/circuits running under it, protecting them and any human presence from potential injury. Essentially, if you understand this paragraph then you are able to test yourself. If you do not, leave it alone. Although used in most types of consumer unit setup, they are not required for those with RCBO’s as these do exactly the same job but with additional safety features.
This range of all metal enclosures are manufactured from steel and are compliant with the 17th Edition Wiring Regulations, Amendment 3. Enclosure kits are supplied complete with devices, DIN rail, neutral cable, neutral and earth terminals and a busbar. The image below is of what’s known as a split load board. This is where it features a main switch for the entire board plus at least 1 RCD labeled as “E”. Also you should be aware that some years ago, the standard wire colours used in the UK were changed so that they harmonised with those used in Europe so you may have several different colours of wire in your home. See our wire colours project here for more information.
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They can also feature 1 or even 2 RCD’s. The RCD, or residual current device is similar to an MCB in that if it senses an issue it will trip and isolate all the of the MCB’s/fuses below it. More on these below.RCD’s also work by detecting an imbalance between the Live and the Neutral conductors and this feature is a requirement for all Class 2 double insulated equipment. If you would like to find out more about these circuits, see our project on radial circuits. How Can I Tell if my House has Radial Circuits or Ring Mains (Final circuits)? When purchasing a consumer unit, it will either come with a main switch and RCD and possibly a number of MCB’s or it will come empty. Depending on how it’s being wired up and what your electrician has chosen to use will depend on what you go for.
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