You may find this article of use in tracking down wires and troubleshooting problems because the fundamental strategy in finding and fixing electrical problems is to discover a position where there is no problem and then keep splitting the distance between that point and the problem point.
When working with any electrical problem, increase your safety by taking simple safeguards. Turn off the breakers to any region in which you are working. Use an outlet tester to check that the power is indeed off before touching any wires. Electrical repairs are more fun during the daytime. Trying to fit in an electrical repair in the late afternoon or evening can make for a long night of juggling torches, extension cables, ladders and tools. Waiting eighteen hrs to start the next morning is almost certainly the better idea.
When adding a switch, make certain it is on the correct conductor. You don’t want to be fitting a light fixture with a switch on the neutral wire. If you are lucky, when you turn the breaker on, all that transpires is that it will trip and frighten you. Changing existing parts is generally easy enough but, place things back the way you found them and you should be ok. On the other hand, adding new equipment can be a more challenging task to take on. Be exceptionally cautious with any wires that are not white, grey or green. In one home that I worked in, some very strange electrical work (probably not done by an electrician). I had a horrid shock of locating cut (but not capped) black and red wires. I think they were most likely intended for a hot tub installment. I carried out a quick test on them only to find out that they were indeed live giving out 220 volts. Scarey to say the least!
My advise is that if you have questions on this topic, at the very least visit a book store or do some research on the internet and buy or read the NEC guide for residential wiring. An electrician may cost you some cash, but a do-it-yourself repair could cost you your property and/or your life.
Discussions about the finest brand names of equipment can get incredibly heated, with well meaning people holding very solid opinions. My own individual feeling on this subject is that it is in actual fact almost not possible to know for sure which is best. Even with the resources of a full testing laboratory, the manufacturing and design specifications change so frequently, that the results are out of date before publication. If you happen to come across a sale where you can buy some other brand for less, then by all means do it.
The correct tools can make the job go a lot more rapidly. However many brand name tools are costly and there are plenty of options. There is always trade-offs concerning price and quality. If you don't have the experience, it can be very complicated standing in the hardware store trying to figure out what you really want. My chief aim with this article is to enlighten people to this one major tip, if you are not confident about what you are doing with electrics then leave well alone and use an electrician.
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I have always had the properties that I own maintained by the same electrician london company and over the years they have saved me a lot of money, just by giving me some very useful advise.