The Panel System Module is used for designing and scheduling AC panel systems including 3-Phase and 1-Phase panels representing power and lighting panels in electrical systems. 3-Phase panels can be either 3-Wire or 4-Wire panels. 1-Phase panels can be set up as 2-Wire or 3-Wire. The ETAP panel model is supported by comprehensive breaker, fuse, and cable libraries. ETAP allows you to graphically connect subpanels to upstream panels.