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What occasions are nickel-plated copper conductors used?
UL has conducted extensive life cycle tests on many kinds of electrical devices and wiring equipment. UL suggested that the diameter be 0. 015 inch (0. 38mm) And the following single-wire stranded conductors should be silver-plated or nickel-plated copper single wires to prevent oxidation on the surface of copper single wires. UL found that very thin copper wires are more likely to be damaged due to oxidation corrosion. Choosing nickel as the coating material has obvious advantages. Among many metal materials, nickel is considered to be a material with better resistance to accelerated oxidation in high temperature environment. The melting point of nickel is also very high (About twice as much as copper) Therefore, the plated conductor can be effectively protected at high temperature. After the copper conductor is plated with nickel, the resistivity is only slightly larger, but it is very soft and anti-fatigue. At a temperature of 250 ° C, it is very important to use nickel-plated copper conductors, and the weight ratio of the nickel coating to 2% is enough. When the temperature is 450 ° C and above, it is recommended to increase the thickness of the nickel coating, in the United States, the weight ratio of the nickel layer is usually 27%. When the temperature exceeds 600 ℃, especially when the high and low temperatures are constantly changing alternately, pure nickel conductors should be used. The current carrying capacity of nickel-plated conductors is larger than that of copper conductors of equal specifications. If all wires and cables in pipelines, trunking or cable bridges transmit the same large current at the same insulation temperature, then, the outer diameter and space occupied by nickel-plated conductor wires and cables can be significantly reduced. For allowable current carrying capacity of nickel-plated copper conductors and copper conductors, please refer to NEC regulations.