Wiring diagrams (Figs. 18.5 and 18.6) should be prepared at the planning stages of a project. And they should be carried throughout the project through construction contract drawings and as-built record drawings. They provide a great deal of insight during planning. They help to define who is providing materials and who is installing materials. They may provide points of demarcation between installers and subcontractors which will require connectors and testing.
