In the construction of consumers must supervise the electrician in strict accordance with the operating procedures for construction, to avoid side construction side modification. Before construction, it is necessary to ask for a circuit modification diagram, the direction of the label wire and the specific location, in particular, should indicate the connector of the pipeline. If there are changes in the construction process, the owner should also communicate with the designer in 2 draw a retrofit map, and then start construction, so that if there is a failure later, the owner can also easily find the line location.