Alert: Due to routine maintenance on the OSHA website, some pages are temporarily unavailable.
To file a complaint with OSHA or to ask a safety and health question, call 1-800-321-6742 (OSHA).

eTools Home : Electric Power Overview | Scope | SH Topics Page | Credits
Electric Power eTool

Distribution Systems: Services

Services
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 1. Distribution system lines and associated equipment
 		 Figure 2. Service line to residence
Figure 2. Service line to residence
Figure 3. Commercial service
Figure 3. Commercial service 		Figure 4. Secondary to underground service via a riser
Figure 4. Secondary to underground service via a riser

eTools Home : Electric Power Overview | Scope | SH Topics Page | Credits