Recently, there are many factories start producing heating cables, and their product quality greatly varies. Hence, choosing high quality heating cables becomes more and more difficult. Due to over ten years of heating alloy smelting experience and continuous efforts to inspect the quality of cables in the market, we get a conclusion that the cable quality largely depends on the quality of heating alloy. With high price and high resistivity, nickel-chromium alloy is only suitable for making short heating cable. Hence, qualified manufacturers usually choose copper-nickel alloy wire as the heating conductor. Different types of copper-nickel alloy wire are used for cables of different lengths. CuNi 1-CuNi 19 range is yellow because of high copper content, while CuNi 22-CuNi 44 range is silvery white as a result of high nickel content. In order to maximize their profits, some irresponsible manufacturers make long cables (160-220 m) using tinned copper wire, galvanized steel wire, stainless steel copper wire or aluminum-magnesium alloy wire as heating conductor. Therefore, it is not surprising that some users usually find large electrical attenuation and power shortage problems.
Some companies may produce dual conductor heating cable that consists of one CuNi alloy wire and one copper wire. Hence, there is only one heating conductor. It is easy to identify this type of cable because one wire is bigger than the other.
Our company is dedicated to providing customers with only high quality dual conductor dual heating cable products. To achieve this, we have established our own alloy smelting factory and use reliable materials, like copper imported from Chile and nickel from Jinchuan, a famous nickel production base. As a result, the resistance error of our CuNi alloy wire is only 0.01 Ω/m, and the power error of our heating cable is 18W±1% per meter.