The wires extending from the secondaries or distribution transformer to a customer's location are called a service. A service can be above or below ground. Underground services have a riser connection at the distribution pole. Commercial and residential services are much the same and can be either 120 or 220 or both.
 Figure 1. Distribution system lines and associated equipment |
 Figure 2. Service line to residence |
 Figure 3. Commercial service |
 Figure 4. Secondary to underground service via a riser |
