By not following electrical regulations and ignoring safety advice, is responsible for many many deaths every year in the United Kingdom. This is why the Government have bought in more electrical regulations in the form of Part P in England . In March 2006 the Electrical Safety Council published some amazing figures. 42% of home owners stated they had never had their electrics checked. 32% of DIY enthusiasts said they had experienced electrical shocks while working on their homes.
A staggering 59% of people do not use, or refer to a qualified electrician when doing electrical work. 35% of homeowners said their electrical installation were older than 20 years and had not had a period inspection by a qualified electrician. Electrical installations should be checked at least every 10 years. There are 12,500 electrical fires in homes across the UK every year so please pay attention to electrical regulations and stay safe. Advice on electrical safety for householders can be found here www.esc.org.uk Please also see our project on the New Wiring and Cable Colours . Checklist: overall safety how it works cables fuses ceiling rose Please remember when attempting any electrical installations at home that you are obliged to get the completed job tested by a fully qualified electrician and obtain a minor works certificate.
Failure to do this may render your house insurance invalid and you may have difficulty selling your home. Please see our project on PART P BUILDING REGULATIONS Safety Check all walls for wires and pipes before cutting out for any new cables and boxes. A detector such as the one below can identify cables in the wall. Click on the image to buy. Scroll to the bottom for all tools and equipment or click through to Neweys Online If in any doubt whatever consult a qualified electrician. There is a legal requirement to obtain a completion certificate from a qualified electrician for any work you do that requires a mains connection. For any work within circuits a minor works certificate should be obtained. Turn off the power and remove the fuse from any circuit you are working on. Make sure no-one can turn the power on by mistake. Use only approved materials. How it works An electrical supply will come to your home at a main, sealed fuse called a service head and from there will go to your meter via one large red and one large black wire. The meter measures how much electricity you use. At no time should you touch either the service head or the meter. From here the electricity will go to your consumer unit, from where it is distributed around the house. Each circuit is fused at this box either by an amp rated fuse wire, or a trip switch if you have an RCD consumer unit. (Residual Current Device) The amount of electricity available to you is measured in Volts, and the rate at which it flows along its conductors is measured in amps.
The power required by any appliance is measured in Watts. the formula for working out the correct cable and fuse is; Watts divided by Volts equals Amps Electricity flows along the live wire, feeding whatever is required and then returns along the neutral wire to its local transformer. The flow can be stopped by the insertion of a switch, which for all practical DIY purposes is placed in the live wire. Switches, most often, will be linked from your ceiling rose through a separate cable, even though one of the wires in this cable is black it is still live. Electricity will always find the shortest or easiest route and you may represent it, so be careful Cables Fixed wiring is done in cable. This consists of individual conductors (wires) sheathed separately, by insulation to prevent leakage. The earth or "ground" wire is normally bare. The wires are then jointly covered by the outer sheath. The wires are colour coded, red for live, black for neutral and green/yellow striped for earth, where this is covered. Modern cables are sheathed with PVC which has an indefinite life, older cables were rubber with about 20/30 years life. If your home has these cables do not attempt electrical extensions with them. When installed, bare earth wires should be covered with an "earth sleeve" which can be bought in all sizes at an electrical
BUT BEFORE YOU PUSH IT BACK ON, LOCATE THE REASON WHY IT TRIPPED.
Most of the time it is because the circuit has been overloaded or there is an earth fault. If you are in doubt contact an electrician. Ceiling Rose We have included ceiling roses in this section because it is the most misunderstood fitting of all. Many people think they can take the old one off, do not mark the wires, and connect a new fitting, black to black, red to red. It is not that easy, because in the majority of cases your light switch will be wired to the rose, and in that case, at least one of the black wires will be live. Below is a diagram of a wired ceiling rose showing you what to look for when working with one
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