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With this kind of companies, an agreement is concluded for work, and after the experts do everything, if you do not have a shades, the act of work performed is signed. To carry out electrical installation, you will need high -quality materials that, in case of proper installation, will last you for more than one year. In this case, you can use the service of the company that will produce work from you, and purchase a cable from them, or, buy a cable yourself in the market. Yes, you can save significantly, but in this case, the company producing electrical installation will not be responsible for the quality of the electric cable you purchased.