Because now the family is decorated, generally line pipe, and then three copper wire (burn, zero line, grounding line) through the line pipe laying. But sheath line than ordinary wire safety, so now in architecture field in the family is decorated still useful to. Sheath line is used the power cord, before a family to decorate, with the sheath line for the lighting and power cord; It can be directly buried inside a wall or fixed on the wall. The benefits of it is that it can save threading pipe or threading tank, by the outside a layer of sheath insulation instead, laying convenient, quick, good appearance, the use of safe, is the connection of household mobile board, refrigerator or air conditioning electric equipment such as the best choice.