Why want to double insulated wire, what is the purpose of double insulation?
general wires are double core or multiconductor double insulation is inside the insulation of the conductor and conductor, insulation outside there are many useful electrical leakage protection, with the insulation of the wires and wire, etc.
the purpose of double insulated wire is primarily for the sake of safety, especially the frequent mobile or easy to friction with the outside world. Outside the insulation of the main is to protect life from harm, even if the friction or other reasons cause breakage can be normal use, outside of insulation material generally is relatively good, good toughness and anti-wear performance. Internal insulation is mainly used for different insulation between the anode and the appearance, guarantee the safety of electricity.