Electric power from the local utility is stepped down from transmission and distribution feeders through transformers to residential, commercial and industrial locations. Several systems are used. The following are examples in common use.
Ground Fault Protection
Service Entrance Grounding
Single-Phase, Three-Wire System
Ground-Fault Sensor Around Bonding Jumper
Ground-Fault Sensor Around All Circuit Conductors
Three-Phase, Four-Wire, Wye-Connected Transformers
Three-Phase, Four-Wire, Delta-Connected Transformers
